/* ============================================================
   oradeinfo.ro — Design System v3 (Google for Education style)
   ============================================================ */

/* ---------- TOKENS ---------- */
:root {
  --g-blue: #1a73e8;
  --g-blue-700: #1558b8;
  --g-blue-50: #e8f0fe;
  --g-blue-100: #d2e3fc;
  --g-red: #ea4335;
  --g-red-50: #fce8e6;
  --g-yellow: #fbbc04;
  --g-yellow-50: #fef7e0;
  --g-green: #34a853;
  --g-green-50: #e6f4ea;

  --subj-info-bg: #e8f0fe; --subj-info: #1a73e8; --subj-info-ink: #174ea6;
  --subj-tic-bg:  #e6f4ea; --subj-tic:  #34a853; --subj-tic-ink:  #137333;
  --subj-mate-bg: #fce8e6; --subj-mate: #ea4335; --subj-mate-ink: #b31412;

  --gray-50: #f8f9fa;
  --gray-100: #f1f3f4;
  --gray-200: #e8eaed;
  --gray-300: #dadce0;
  --gray-500: #9aa0a6;
  --gray-700: #5f6368;
  --gray-800: #3c4043;
  --gray-900: #202124;

  --surface: #ffffff;
  --surface-alt: var(--gray-50);
  --surface-blue: var(--g-blue-50);
  --surface-green: var(--g-green-50);

  --bg: var(--surface);
  --text: var(--gray-900);
  --text-muted: var(--gray-700);
  --text-subtle: var(--gray-500);
  --border: var(--gray-200);
  --border-strong: var(--gray-300);
  --primary: var(--g-blue);
  --primary-hover: var(--g-blue-700);
  --primary-soft: var(--g-blue-50);
  --accent: var(--g-green);
  --accent-soft: var(--g-green-50);
  --success: var(--g-green); --success-soft: var(--g-green-50); --success-strong: #137333;
  --warning: var(--g-yellow); --warning-soft: var(--g-yellow-50); --warning-strong: #b06000;
  --error: var(--g-red); --error-soft: var(--g-red-50); --error-strong: #b31412;

  --font-display: "Google Sans", "Product Sans", "Plus Jakarta Sans", system-ui, sans-serif;
  --font-body: "Roboto", "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "Roboto Mono", "JetBrains Mono", ui-monospace, monospace;

  --r-xs: 8px; --r-sm: 12px; --r-md: 16px; --r-lg: 24px; --r-xl: 32px; --r-pill: 999px;
  --radius-xs: var(--r-xs); --radius-sm: var(--r-sm); --radius-md: var(--r-md); --radius-lg: var(--r-lg); --radius-xl: var(--r-xl); --radius-full: var(--r-pill);

  --elev-1: 0 1px 2px rgba(60,64,67,.08), 0 1px 3px rgba(60,64,67,.06);
  --elev-2: 0 1px 2px rgba(60,64,67,.10), 0 2px 6px 2px rgba(60,64,67,.08);
  --elev-3: 0 1px 3px rgba(60,64,67,.12), 0 4px 12px 3px rgba(60,64,67,.10);
  --elev-4: 0 2px 6px rgba(60,64,67,.14), 0 8px 24px 4px rgba(60,64,67,.10);
  --elev-hero: 0 24px 64px -16px rgba(26,115,232,.25), 0 8px 24px -8px rgba(60,64,67,.10);
  --shadow-xs: var(--elev-1); --shadow-sm: var(--elev-1); --shadow-md: var(--elev-2);
  --shadow-lg: var(--elev-3); --shadow-xl: var(--elev-4); --shadow-glow: var(--elev-hero);

  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px; --space-8: 64px; --space-9: 96px;

  --ease-emph: cubic-bezier(.2,0,0,1);
  --ease-std: cubic-bezier(.4,0,.2,1);
  --ease-out: var(--ease-emph);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
  --t-fast: 120ms; --t-base: 240ms; --t-slow: 480ms; --d-fast: 120ms; --d-med: 240ms; --d-slow: 480ms;

  --container: 1200px;
  --container-narrow: 880px;
  --gutter: clamp(16px, 4vw, 32px);
  --header-h: 72px;
  --sidebar-w: 280px;

  --gradient-hero: linear-gradient(135deg, #1a73e8 0%, #4285f4 50%, #34a853 100%);
  --gradient-text: linear-gradient(135deg, #1a73e8 0%, #34a853 100%);
  --ring: 0 0 0 3px rgb(26 115 232 / 0.24);
  --ring-error: 0 0 0 3px rgb(217 48 37 / 0.20);
}

/* ---------- RESET ---------- */
*,*::before,*::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }
body {
  font-family: var(--font-body);
  font-size: 16px; line-height: 1.6;
  color: var(--text); background: var(--bg);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  min-height: 100vh;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: var(--g-blue); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- TYPOGRAPHY ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display); font-weight: 700; line-height: 1.15;
  letter-spacing: -0.02em; color: var(--text);
}
h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); letter-spacing: -0.03em; line-height: 1.05; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.75rem); letter-spacing: -0.025em; }
h3 { font-size: clamp(1.25rem, 2vw, 1.625rem); }
h4 { font-size: 1.125rem; font-weight: 600; }
.lead { font-size: clamp(1.0625rem, 1.5vw, 1.25rem); color: var(--text-muted); line-height: 1.55; max-width: 60ch; }
.eyebrow {
  display: inline-block; font-family: var(--font-display);
  font-size: .8125rem; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--g-blue); margin-bottom: 12px;
}
.text-muted { color: var(--text-muted); }
.text-mono { font-family: var(--font-mono); }
.text-gradient { background: var(--gradient-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.num { font-feature-settings: "tnum" 1, "lnum" 1; }

/* ---------- LAYOUT ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.container--narrow, .container-narrow { max-width: var(--container-narrow); margin-inline: auto; padding-inline: var(--gutter); }
.row { display: flex; gap: var(--space-3); align-items: center; flex-wrap: wrap; }
.row--between { justify-content: space-between; }
.grid { display: grid; gap: var(--space-5); }
.grid--cards { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.section { padding-block: clamp(48px, 8vw, 96px); }
.section--hero { padding-block: clamp(80px, 12vw, 160px) clamp(64px, 8vw, 96px); }
.section--alt { background: var(--surface-alt); }
.section--blue { background: var(--surface-blue); }
.section--green { background: var(--surface-green); }

.icon { width: 1.25em; height: 1.25em; stroke-width: 2; flex-shrink: 0; }
.icon--lg { width: 1.5em; height: 1.5em; }
.icon--xl { width: 2em; height: 2em; }
.inline-form { display: inline; margin: 0; }

/* ---------- PROMO BANNER ---------- */
.promo-banner {
  background: linear-gradient(90deg, var(--g-yellow-50), #fff8e1);
  border-bottom: 1px solid var(--g-yellow);
  padding: 10px 16px; text-align: center;
  font-size: .9375rem; color: var(--gray-800);
}
.promo-banner strong { color: #b06000; }

/* ---------- HEADER ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--gray-200);
}
.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 700; font-size: 1.25rem;
  color: var(--gray-900);
}
.brand:hover { text-decoration: none; }
.brand__mark {
  width: 32px; height: 32px; border-radius: 8px;
  background:
    conic-gradient(from 90deg at 50% 50%,
      var(--g-blue) 0 90deg,
      var(--g-red) 90deg 180deg,
      var(--g-yellow) 180deg 270deg,
      var(--g-green) 270deg 360deg);
  position: relative;
  box-shadow: var(--elev-1);
  flex-shrink: 0;
}
.brand__mark::after {
  content: ""; position: absolute; inset: 6px;
  background: #fff; border-radius: 4px;
}
.brand__mark svg { display: none; }
.brand__name { font-weight: 600; color: var(--gray-900); }
.brand__name b { color: var(--g-blue); font-weight: 700; }

.nav-burger {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: var(--r-pill);
  color: var(--gray-700);
}
.nav-burger:hover { background: var(--gray-100); color: var(--gray-900); }
@media (min-width: 768px) { .nav-burger { display: none; } }

.nav { display: none; gap: 4px; }
@media (min-width: 768px) { .nav { display: flex; } }
@media (max-width: 767px) {
  .nav.is-open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    padding: 12px;
    box-shadow: var(--elev-2);
    gap: 4px;
  }
  .nav.is-open .nav__link { padding: 12px; border-radius: var(--r-sm); }
  .nav.is-open .nav__link::after { display: none; }
}
.nav__link {
  position: relative;
  padding: 8px 12px;
  font-family: var(--font-display); font-weight: 500; font-size: .9375rem;
  color: var(--gray-800); border-radius: var(--r-xs);
  transition: background var(--d-med), color var(--d-med);
}
.nav__link::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 4px;
  height: 2px; background: var(--g-blue); transform: scaleX(0); transform-origin: left;
  transition: transform var(--d-med) var(--ease-emph);
}
.nav__link:hover { text-decoration: none; background: var(--gray-50); }
.nav__link:hover::after, .nav__link--active::after { transform: scaleX(1); }
.nav__link--active { color: var(--g-blue); }

.header__spacer { flex: 1; }
.header__actions { display: flex; gap: 8px; align-items: center; }

.theme-toggle {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: var(--r-pill);
  color: var(--gray-700);
  transition: background var(--d-med), color var(--d-med);
}
.theme-toggle:hover { background: var(--gray-100); color: var(--gray-900); }
.theme-toggle .icon-moon { display: none; }

.user-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px;
  background: var(--gray-50); border: 1px solid var(--gray-200);
  border-radius: var(--r-pill);
  font-size: .875rem; font-weight: 500;
}
.user-chip--connected { background: var(--g-green-50); border-color: var(--g-green); color: #137333; }
.user-chip--connected .icon { color: #137333; }
.user-chip--connected strong { color: #137333; }
@media (max-width: 640px) { .user-chip span { display: none; } .user-chip { padding: 6px 8px; } }
.user-chip .status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--g-green); box-shadow: 0 0 0 0 rgba(52,168,83,.6); animation: pulse-green 2s infinite; }
@keyframes pulse-green {
  70% { box-shadow: 0 0 0 8px rgba(52,168,83,0); }
  100% { box-shadow: 0 0 0 0 rgba(52,168,83,0); }
}
.pill-admin { background: var(--g-blue); color: #fff; padding: 1px 8px; border-radius: 999px; font-size: .7rem; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }

/* ---------- BUTTONS (Material + Ripple) ---------- */
.btn {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  height: 44px; padding: 0 24px;
  font-family: var(--font-display); font-weight: 500; font-size: .9375rem;
  border-radius: var(--r-pill);
  background: var(--g-blue); color: #fff; border: 0;
  transition: box-shadow var(--d-med) var(--ease-std), background-color var(--d-med), transform var(--d-fast);
  white-space: nowrap; cursor: pointer; user-select: none;
}
.btn:hover { background: var(--g-blue-700); box-shadow: var(--elev-2); text-decoration: none; }
.btn:active { transform: scale(.98); }
.btn:focus-visible { outline: none; box-shadow: var(--ring); }

.btn--secondary, .btn--tonal { background: var(--g-blue-50); color: var(--g-blue-700); }
.btn--secondary:hover, .btn--tonal:hover { background: var(--g-blue-100); }
.btn--ghost { background: transparent; color: var(--g-blue); }
.btn--ghost:hover { background: var(--g-blue-50); }
.btn--danger { background: var(--g-red); color: #fff; }
.btn--danger:hover { background: #b31412; }
.btn--success { background: var(--g-green); color: #fff; }
.btn--success:hover { background: #137333; }
.btn--accent { background: var(--g-green); color: #fff; }
.btn--accent:hover { background: #137333; }

.btn--lg { height: 56px; padding: 0 32px; font-size: 1rem; }
.btn--sm { height: 36px; padding: 0 16px; font-size: .875rem; }
.btn--icon { width: 40px; height: 40px; padding: 0; }
.btn--block { width: 100%; }

.ripple {
  position: absolute; border-radius: 50%;
  transform: scale(0); pointer-events: none;
  background: rgba(255,255,255,.45);
  animation: ripple var(--d-slow) var(--ease-std);
}
.btn--secondary .ripple, .btn--tonal .ripple, .btn--ghost .ripple { background: rgba(26,115,232,.18); }
@keyframes ripple { to { transform: scale(3.5); opacity: 0; } }

/* ---------- HERO V3 ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: clamp(48px, 8vw, 96px) 0 clamp(48px, 6vw, 80px);
}
.hero__inner-2col {
  display: grid; gap: clamp(32px, 5vw, 64px);
  grid-template-columns: 1fr;
  align-items: center;
}
@media (min-width: 960px) { .hero__inner-2col { grid-template-columns: 1.1fr 0.9fr; } }
.hero__col-text { text-align: left; }
@media (max-width: 959px) { .hero__col-text { text-align: center; } }
.hero__col-art { display: flex; align-items: center; justify-content: center; }
.hero-art { width: 100%; max-width: 580px; height: auto; }
.hero::before, .hero::after {
  content: ""; position: absolute; border-radius: 50%;
  filter: blur(60px); opacity: .55; z-index: 0;
}
.hero::before {
  width: 480px; height: 480px; left: -160px; top: -120px;
  background: radial-gradient(circle, var(--g-blue-100), transparent 70%);
}
.hero::after {
  width: 420px; height: 420px; right: -140px; top: 40px;
  background: radial-gradient(circle, var(--g-green-50), transparent 70%);
}
.hero > * { position: relative; z-index: 1; }
.hero__inner { display: grid; grid-template-columns: 1fr; gap: 0; }

.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px;
  background: #fff; border: 1px solid var(--gray-200);
  border-radius: var(--r-pill);
  font-family: var(--font-display); font-size: .8125rem; font-weight: 500;
  color: var(--gray-700);
  box-shadow: var(--elev-1);
  margin-bottom: 24px;
}
.hero__eyebrow .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--g-red);
  box-shadow: 0 0 0 0 rgba(234,67,53,.6);
  animation: pulse 1.8s infinite;
}
@keyframes pulse {
  70% { box-shadow: 0 0 0 10px rgba(234,67,53,0); }
  100% { box-shadow: 0 0 0 0 rgba(234,67,53,0); }
}

.hero__title { max-width: 22ch; }
@media (max-width: 959px) { .hero__title { margin-inline: auto; } }
.hero__title span, .hero__title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--g-blue), var(--g-green));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__lead { margin: 24px 0 32px; max-width: 56ch; font-size: clamp(1.0625rem, 1.5vw, 1.25rem); }
@media (max-width: 959px) { .hero__lead { margin-inline: auto; } }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; }
@media (max-width: 959px) { .hero__cta { justify-content: center; } }
.hero__proof { margin-top: 16px; color: var(--gray-700); font-size: .875rem; display: inline-flex; align-items: center; gap: 8px; }

.hero__stats {
  margin-top: 56px;
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 16px; max-width: 720px; margin-inline: auto;
  list-style: none; padding: 0;
}
.hero__stats li, .stat {
  padding: 16px 12px;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--r-md);
  box-shadow: var(--elev-1);
  display: flex; flex-direction: column; gap: 4px;
  transition: transform var(--d-med) var(--ease-emph), box-shadow var(--d-med) var(--ease-emph);
}
.hero__stats li:hover, .stat:hover { transform: translateY(-2px); box-shadow: var(--elev-2); }
.hero__stats strong, .stat-num {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.75rem; color: var(--g-blue);
  font-feature-settings: "tnum" 1; line-height: 1;
}
.hero__stats span, .stat-label {
  color: var(--gray-700); font-size: .8125rem;
  text-transform: uppercase; letter-spacing: .04em;
}
@media (max-width: 640px) { .hero__stats { grid-template-columns: repeat(2, 1fr); } }

/* hero visual code preview (kept for back-compat) */
.hero__visual {
  display: none;
}
.code-card {
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-md);
  box-shadow: var(--elev-3);
  overflow: hidden;
  max-width: 640px; margin: 56px auto 0;
}
.code-card__head { display: flex; align-items: center; gap: 8px; padding: 12px 16px; background: var(--gray-50); border-bottom: 1px solid var(--gray-200); }
.code-card__dot { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; }
.code-card__file { margin-left: 12px; font-family: var(--font-mono); font-size: .8125rem; color: var(--gray-700); }
.code-card__body { font-family: var(--font-mono); font-size: .875rem; line-height: 1.7; padding: 24px; margin: 0; white-space: pre; overflow-x: auto; color: var(--gray-900); text-align: left; }
.code-card__body .kw { color: var(--g-blue); font-weight: 600; }
.code-card__body .str { color: var(--g-green); }
.code-card__body .cm { color: var(--gray-500); font-style: italic; }
.code-card__output { border-top: 1px dashed var(--gray-200); padding: 12px 24px; background: var(--gray-50); display: flex; align-items: center; gap: 12px; }
.code-card__output-label { font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--gray-700); }
.code-card__output-text { font-family: var(--font-mono); font-size: .875rem; color: var(--g-green); font-weight: 600; }

/* ---------- SECTION HEADS ---------- */
.section__head { text-align: center; max-width: 720px; margin: 0 auto var(--space-7); }
.section__head h2 { margin-top: 8px; }
.section__eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-size: .8125rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--g-blue); margin-bottom: 8px;
}
.section__lead { color: var(--gray-700); margin-top: 16px; font-size: 1.0625rem; }

/* ---------- SUBJECT CARDS (asymmetric, color blocks) ---------- */
.subject-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
}
.subject-grid > .subject-card:first-child { grid-row: span 2; }
@media (max-width: 900px) {
  .subject-grid { grid-template-columns: 1fr; }
  .subject-grid > .subject-card:first-child { grid-row: auto; }
}
.subject-card {
  position: relative; overflow: hidden;
  display: flex; flex-direction: column; gap: 16px; justify-content: space-between;
  min-height: 240px;
  padding: 32px;
  border-radius: var(--r-lg);
  background: var(--g-blue-50);
  color: var(--gray-900);
  text-decoration: none;
  transition: transform var(--d-med) var(--ease-emph), box-shadow var(--d-med) var(--ease-emph);
}
.subject-card:hover { transform: translateY(-4px); box-shadow: var(--elev-3); text-decoration: none; }
.subject-card--informatica { background: var(--subj-info-bg); color: var(--subj-info-ink); }
.subject-card--informatica { border-top-right-radius: var(--r-xl); border-bottom-left-radius: var(--r-xl); }
.subject-card--tic { background: var(--subj-tic-bg); color: var(--subj-tic-ink); }
.subject-card--soon { background: var(--g-yellow-50); color: #b06000; min-height: 0; }

.subject-card__icon {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  background: #fff; border-radius: 18px;
  color: var(--g-blue);
  box-shadow: var(--elev-1);
}
.subject-card--tic .subject-card__icon { color: var(--g-green); }
.subject-card__title { font-family: var(--font-display); font-weight: 700; font-size: 1.5rem; color: inherit; margin: 0; }
.subject-card__desc { color: inherit; opacity: .85; font-size: .95rem; margin: 0; max-width: 36ch; }
.subject-card__meta { display: flex; gap: 16px; color: inherit; opacity: .7; font-size: .875rem; }
.subject-card__cta {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-display); font-weight: 500;
  color: inherit; margin-top: auto;
  transition: gap var(--d-med) var(--ease-emph);
}
.subject-card:hover .subject-card__cta { gap: 12px; }

/* ---------- CARDS (general) ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-md);
  padding: 24px;
  transition: transform var(--d-med) var(--ease-emph), box-shadow var(--d-med);
}
.card--feature { display: flex; flex-direction: column; gap: 12px; }
.card--feature:hover { transform: translateY(-2px); box-shadow: var(--elev-2); }
.card__icon {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: var(--g-blue-50); color: var(--g-blue);
}
.card--feature.card--accent .card__icon { background: var(--g-green-50); color: var(--g-green); }
.card--feature.card--warm .card__icon { background: var(--g-yellow-50); color: #b06000; }
.card--feature.card--red .card__icon { background: var(--g-red-50); color: var(--g-red); }
.card__title { font-family: var(--font-display); font-size: 1.25rem; font-weight: 600; }
.card__desc { color: var(--gray-700); font-size: .9375rem; line-height: 1.55; }
.card__link {
  margin-top: auto; display: inline-flex; align-items: center; gap: 4px;
  color: var(--g-blue); font-family: var(--font-display); font-weight: 500; font-size: .9375rem;
}
.card__link:hover { text-decoration: none; }
.card__link .icon { transition: transform var(--d-med); }
.card__link:hover .icon { transform: translateX(4px); }

.card-form { background: var(--surface); border: 1px solid var(--gray-200); border-radius: var(--r-md); padding: 32px; max-width: 720px; }

/* ---------- WHY/STEPS TILES ---------- */
.why-grid, .steps {
  display: grid; gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.why-tile, .step {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-md);
}
.why-tile__icon, .step .step__icon {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: var(--g-green-50); color: var(--g-green);
  margin-bottom: 16px;
}
.why-tile__title, .step__title { font-family: var(--font-display); font-weight: 600; font-size: 1.0625rem; margin-bottom: 8px; }
.why-tile__body, .step__body { color: var(--gray-700); font-size: .9375rem; }
.step__num { display: inline-block; font-family: var(--font-display); font-size: .875rem; font-weight: 700; color: var(--g-blue); letter-spacing: .08em; margin-bottom: 16px; }
.step__icon-art { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 14px; margin-bottom: 16px; }

/* ---------- COURSE OUTLINE / PROGRESS ---------- */
.course-head {
  background: linear-gradient(135deg, var(--g-blue-50), #fff 60%);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  padding: 40px;
  margin-bottom: var(--space-7);
  position: relative; overflow: hidden;
}
.course-head__row { display: flex; gap: 24px; align-items: flex-start; flex-wrap: wrap; }
.course-head__icon {
  width: 64px; height: 64px;
  display: grid; place-items: center;
  border-radius: 18px;
  background: var(--g-blue); color: #fff;
  flex-shrink: 0; box-shadow: var(--elev-2);
}
.course-head__body { flex: 1; min-width: 240px; }
.course-head__title { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.5rem, 3vw, 2rem); }
.course-head__desc { color: var(--gray-700); margin-top: 8px; }
.course-head__stats { display: flex; gap: 20px; margin-top: 16px; flex-wrap: wrap; }
.course-head__stat { display: flex; align-items: center; gap: 8px; font-size: .9375rem; color: var(--gray-700); }
.course-head__stat strong { color: var(--gray-900); font-weight: 600; }

.progress-card {
  margin-top: 24px;
  padding: 16px 20px;
  background: #fff;
  border-radius: var(--r-md);
  border: 1px solid var(--gray-200);
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.progress-card__label { font-family: var(--font-display); font-weight: 600; color: var(--gray-900); display: flex; align-items: center; gap: 8px; }
.progress-card__bar { flex: 1; min-width: 200px; height: 8px; background: var(--gray-200); border-radius: var(--r-pill); overflow: hidden; }
.progress-card__fill { height: 100%; background: linear-gradient(90deg, var(--g-blue), var(--g-green)); border-radius: inherit; transition: width var(--d-slow) var(--ease-emph); }
.progress-card__count { font-family: var(--font-display); font-weight: 700; color: var(--gray-900); font-feature-settings: "tnum" 1; }

.outline { display: grid; gap: 16px; max-width: 880px; margin: 0 auto; }
.chapter { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--r-lg); overflow: hidden; }
.chapter__head {
  display: grid; grid-template-columns: auto 1fr auto;
  gap: 16px; align-items: center; padding: 20px 24px;
  background: linear-gradient(90deg, var(--g-blue-50), transparent 70%);
}
.chapter__num {
  font-family: var(--font-display); font-weight: 700; font-size: .85rem;
  color: var(--g-blue); letter-spacing: .06em;
  background: #fff;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--g-blue-100);
}
.chapter__title { font-family: var(--font-display); font-weight: 600; font-size: 1.0625rem; margin: 0; }
.chapter__progress { display: flex; align-items: center; gap: 8px; font-size: .8125rem; color: var(--gray-700); font-feature-settings: "tnum" 1; }
.chapter__progress-bar { width: 80px; height: 6px; background: var(--gray-200); border-radius: var(--r-pill); overflow: hidden; }
.chapter__progress-fill { height: 100%; background: var(--g-green); border-radius: inherit; transition: width var(--d-slow) var(--ease-emph); }

.lesson-list { list-style: none; padding: 0; margin: 0; }
.lesson-row {
  display: grid; grid-template-columns: 32px 1fr auto;
  gap: 16px; align-items: center;
  padding: 14px 24px;
  border-top: 1px solid var(--gray-100);
  text-decoration: none; color: inherit;
  transition: background-color var(--d-med);
  position: relative;
}
.lesson-row:first-child { border-top: 0; }
.lesson-row:hover { background: var(--gray-50); text-decoration: none; }
.lesson-row[aria-disabled="true"] { opacity: .55; cursor: not-allowed; pointer-events: none; }
.lesson-row[data-status="current"] { background: var(--g-blue-50); }
.lesson-row[data-status="current"]::before {
  content: ""; position: absolute; left: 0; top: 8px; bottom: 8px; width: 3px;
  background: var(--g-blue); border-radius: 0 3px 3px 0;
  animation: pulse-bar 1.6s ease-in-out infinite;
}
@keyframes pulse-bar { 50% { opacity: .4; } }

.lesson-row__status {
  width: 24px; height: 24px; border-radius: 50%;
  border: 2px solid var(--gray-300);
  display: grid; place-items: center;
  background: #fff; color: var(--gray-500);
  flex-shrink: 0;
}
.lesson-row[data-status="completed"] .lesson-row__status {
  background: var(--g-green); border-color: var(--g-green); color: #fff;
}
.lesson-row[data-status="current"] .lesson-row__status {
  background: var(--g-blue); border-color: var(--g-blue); color: #fff;
}
.lesson-row__status .icon { width: 14px; height: 14px; }
.lesson-row__title { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.lesson-row__title strong { font-family: var(--font-display); font-weight: 500; font-size: .9375rem; color: var(--gray-900); }
.lesson-row__title small { color: var(--gray-700); font-size: .8125rem; font-feature-settings: "tnum" 1; }
.lesson-row[data-status="completed"] .lesson-row__title strong { color: var(--gray-700); }

.lesson-row__action { color: var(--gray-500); font-size: .8125rem; display: flex; align-items: center; gap: 4px; }
.lesson-row[data-status="current"] .lesson-row__action { color: var(--g-blue); font-weight: 600; }
.lesson-row[data-status="completed"] .lesson-row__action { color: var(--g-green); font-weight: 600; }
.lesson-row:hover .lesson-row__action .icon { transform: translateX(2px); transition: transform var(--d-med); }

/* ---------- LESSON PAGE ---------- */
.lesson { padding-block: var(--space-7); }
.lesson__breadcrumb { display: flex; gap: 8px; align-items: center; font-size: .875rem; color: var(--gray-700); margin-bottom: 16px; flex-wrap: wrap; }
.lesson__breadcrumb a { color: var(--gray-700); display: inline-flex; align-items: center; gap: 4px; }
.lesson__breadcrumb a:hover { color: var(--gray-900); text-decoration: none; }

.lesson__head { margin-bottom: var(--space-7); }
.lesson__title { font-size: clamp(2rem, 4vw, 3rem); margin-top: 12px; line-height: 1.1; }

.lesson__example {
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-md);
  padding: 24px;
  margin-bottom: var(--space-7);
}
.lesson__example-head { display: flex; flex-direction: column; gap: 4px; margin-bottom: 16px; }
.lesson__example-head h3 { display: flex; align-items: center; gap: 8px; font-family: var(--font-display); font-size: 1rem; font-weight: 600; margin: 0; }

.lesson__body { font-size: 1.0625rem; line-height: 1.75; color: var(--gray-900); }

.lesson__nav { margin-top: var(--space-8); padding-top: 24px; border-top: 1px solid var(--gray-200); display: grid; gap: 12px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .lesson__nav { grid-template-columns: 1fr 1fr; } }
.lesson__nav-btn {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--r-md);
  color: var(--gray-900); text-decoration: none;
  transition: border-color var(--d-med), transform var(--d-med);
}
.lesson__nav-btn:hover { border-color: var(--g-blue); transform: translateY(-2px); text-decoration: none; }
.lesson__nav-btn span { display: flex; flex-direction: column; }
.lesson__nav-btn small { color: var(--gray-700); font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; font-weight: 600; }
.lesson__nav-btn strong { font-family: var(--font-display); font-size: 1rem; font-weight: 600; }
.lesson__nav-btn--primary { background: var(--g-blue); border-color: transparent; color: #fff; text-align: right; justify-content: flex-end; }
.lesson__nav-btn--primary:hover { background: var(--g-blue-700); color: #fff; }
.lesson__nav-btn--primary small { color: rgba(255,255,255,.85); }
.lesson__nav-btn--success { background: var(--g-green); border-color: transparent; color: #fff; text-align: right; justify-content: flex-end; }
.lesson__nav-btn--success:hover { background: #137333; color: #fff; }
.lesson__nav-btn--success small { color: rgba(255,255,255,.85); }
.lesson__nav-btn--locked { background: var(--g-yellow-50); border-color: var(--g-yellow); color: #b06000; cursor: not-allowed; }
.lesson__nav-btn--locked:hover { background: var(--g-yellow-50); transform: none; }
.lesson__nav-btn--locked small { color: #b06000; opacity: .7; }
.lesson__nav-btn--locked strong { opacity: .85; }

/* ---------- EXERCISES ---------- */
.exercises { margin-top: var(--space-7); padding-top: var(--space-7); border-top: 2px solid var(--gray-200); }
.exercises__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }
.exercises__title { font-family: var(--font-display); font-weight: 700; font-size: 1.5rem; display: flex; align-items: center; gap: 8px; }
.exercises__counter { font-family: var(--font-display); font-size: .875rem; font-weight: 600; padding: 4px 12px; border-radius: var(--r-pill); background: var(--gray-100); color: var(--gray-700); }

.exercise {
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-md);
  padding: 24px;
  margin-bottom: 16px;
  transition: border-color var(--d-med);
}
.exercise[data-status="correct"] { border-color: var(--g-green); background: var(--g-green-50); }
.exercise[data-status="incorrect"] { border-color: var(--g-red); }
.exercise__head { display: flex; gap: 12px; align-items: center; margin-bottom: 16px; }
.exercise__num {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--g-blue-50); color: var(--g-blue);
  font-family: var(--font-display); font-weight: 700; font-size: .875rem;
  flex-shrink: 0;
}
.exercise[data-status="correct"] .exercise__num { background: var(--g-green); color: #fff; }
.exercise[data-status="incorrect"] .exercise__num { background: var(--g-red); color: #fff; }
.exercise__type { font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--gray-700); }
.exercise__prompt { font-size: 1rem; line-height: 1.6; }
.exercise__prompt code { font-family: var(--font-mono); font-size: .9em; padding: 2px 6px; background: var(--gray-100); border: 1px solid var(--gray-200); border-radius: 4px; }
.exercise__prompt pre { margin: 12px 0; padding: 16px; background: var(--gray-900); color: #e8eaed; border-radius: var(--r-sm); overflow-x: auto; font-family: var(--font-mono); font-size: .875rem; line-height: 1.7; }
.exercise__prompt pre code { background: transparent; border: 0; padding: 0; color: inherit; font-size: inherit; }

.exercise__form { margin-top: 16px; display: grid; gap: 12px; }
.exercise__option {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-sm);
  cursor: pointer; user-select: none;
  transition: background var(--d-med), border-color var(--d-med);
}
.exercise__option:hover { background: var(--gray-100); }
.exercise__option input { width: 18px; height: 18px; accent-color: var(--g-blue); }
.exercise__option--correct { background: var(--g-green-50); border-color: var(--g-green); color: #137333; }
.exercise__option--incorrect { background: var(--g-red-50); border-color: var(--g-red); color: #b31412; }

.exercise__fill {
  display: inline-block; min-width: 80px;
  font-family: var(--font-mono); font-size: .95em;
  padding: 4px 10px;
  border: 2px dashed var(--gray-300);
  background: #fff;
  border-radius: 4px; color: var(--gray-900);
}
.exercise__fill:focus { outline: none; border-style: solid; border-color: var(--g-blue); box-shadow: var(--ring); }

.exercise__verify { display: flex; gap: 12px; margin-top: 12px; align-items: center; flex-wrap: wrap; }
.exercise__feedback {
  margin-top: 12px;
  padding: 16px 20px;
  border-radius: var(--r-sm);
  border: 1px solid;
  font-size: .9375rem; line-height: 1.6;
  display: none;
}
.exercise__feedback.is-shown { display: block; }
.exercise__feedback--correct { background: var(--g-green-50); border-color: var(--g-green); color: #137333; }
.exercise__feedback--incorrect { background: var(--g-red-50); border-color: var(--g-red); color: #b31412; }
.exercise__feedback strong { font-weight: 700; }
.exercise__done { display: flex; align-items: center; gap: 8px; color: var(--g-green); font-weight: 600; font-size: .9375rem; }

/* ---------- COMPLETION BANNER ---------- */
.completion-banner {
  margin-top: var(--space-7);
  padding: 32px;
  background: linear-gradient(135deg, var(--g-green), #137333);
  color: #fff; border-radius: var(--r-lg);
  display: none; text-align: center;
}
.completion-banner.is-shown { display: block; animation: pop-in 400ms var(--ease-spring); }
.completion-banner__icon { width: 64px; height: 64px; display: grid; place-items: center; margin: 0 auto 12px; background: rgba(255,255,255,.2); border-radius: 50%; }
.completion-banner h3 { color: #fff; margin-bottom: 8px; font-size: 1.5rem; }
.completion-banner p { color: rgba(255,255,255,.9); margin-bottom: 16px; }
.completion-banner .btn { background: #fff; color: #137333; }
.completion-banner .btn:hover { background: rgba(255,255,255,.92); }
@keyframes pop-in { 0% { opacity: 0; transform: scale(.92) translateY(8px); } 100% { opacity: 1; transform: scale(1) translateY(0); } }

/* ---------- FORMS ---------- */
.field { display: grid; gap: 8px; }
.field__label { font-family: var(--font-display); font-size: .875rem; font-weight: 500; color: var(--gray-900); }
.field__hint { font-size: .8125rem; color: var(--gray-700); }
.field__error { font-size: .8125rem; color: var(--g-red); display: flex; align-items: center; gap: 4px; }
.input-wrap { position: relative; }
.input-wrap > .icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--gray-500); pointer-events: none; }
.input, .textarea, .select {
  width: 100%; height: 48px;
  padding: 0 16px;
  background: #fff;
  border: 1px solid var(--gray-300);
  border-radius: var(--r-sm);
  color: var(--gray-900);
  font-size: .9375rem;
  transition: border-color var(--d-med), box-shadow var(--d-med);
}
.input-wrap > .input, .input-wrap > .select { padding-left: calc(14px + 1.25em + 8px); }
.input::placeholder { color: var(--gray-500); }
.input:hover { border-color: var(--gray-500); }
.input:focus, .textarea:focus, .select:focus { outline: none; border-color: var(--g-blue); box-shadow: var(--ring); }
.textarea { height: auto; padding: 12px 16px; resize: vertical; min-height: 120px; line-height: 1.6; font-family: inherit; }
.checkbox { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; user-select: none; font-size: .9375rem; color: var(--gray-900); }
.checkbox input { accent-color: var(--g-blue); width: 18px; height: 18px; }
.form-row-inline { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .form-row-inline { grid-template-columns: 1fr; } }
.form-actions { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; }

/* ---------- AUTH ---------- */
.auth { min-height: calc(100vh - var(--header-h) - 200px); display: grid; place-items: center; padding: 48px 16px; }
.auth__card { width: 100%; max-width: 460px; background: #fff; border: 1px solid var(--gray-200); border-radius: var(--r-lg); box-shadow: var(--elev-3); padding: 40px; }
.auth__icon {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  border-radius: 18px;
  background: var(--g-blue); color: #fff;
  margin: 0 auto 24px;
  box-shadow: 0 8px 24px -8px rgba(26,115,232,.4);
}
.auth__title { text-align: center; font-size: clamp(1.5rem, 2vw + 1rem, 2rem); letter-spacing: -0.02em; }
.auth__sub { text-align: center; color: var(--gray-700); margin-top: 8px; }
.auth__form { margin-top: 24px; display: grid; gap: 16px; }
.auth__foot { margin-top: 24px; text-align: center; color: var(--gray-700); font-size: .9375rem; }
.auth__foot a { font-family: var(--font-display); font-weight: 500; }

/* ---------- FOOTER (DARK) ---------- */
.site-footer {
  background: var(--gray-900); color: var(--gray-300);
  padding: 64px 0 32px;
  margin-top: var(--space-9);
}
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 48px; }
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-grid .brand, .footer-grid .brand:hover { color: #fff; }
.footer-grid .brand__name { color: #fff; }
.footer-grid .brand__name b { color: #aecbfa; }
.footer-col h4, .footer-col h5 {
  font-family: var(--font-display); color: #fff; font-size: .8125rem;
  text-transform: uppercase; letter-spacing: .08em; margin-bottom: 16px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer-col a { color: var(--gray-300); font-size: .9375rem; }
.footer-col a:hover { color: #fff; text-decoration: none; }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px;
  margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--gray-800);
  font-size: .8125rem; color: var(--gray-500);
}

/* ---------- FAB + SNACKBAR ---------- */
.fab {
  position: fixed; right: 24px; bottom: 24px; z-index: 40;
  width: 56px; height: 56px; border-radius: 18px;
  background: var(--g-blue); color: #fff;
  display: grid; place-items: center;
  box-shadow: var(--elev-3);
  transition: transform var(--d-med) var(--ease-emph), border-radius var(--d-med);
}
.fab:hover { transform: translateY(-2px) scale(1.04); border-radius: 24px; }

.snackbar {
  position: fixed; left: 50%; bottom: 24px;
  transform: translate(-50%, 120%);
  display: inline-flex; align-items: center; gap: 16px;
  padding: 14px 20px;
  background: var(--gray-900); color: #fff;
  border-radius: var(--r-sm); box-shadow: var(--elev-4);
  font-size: .9375rem; min-width: 280px; max-width: 560px;
  z-index: 60; opacity: 0;
  transition: transform var(--d-slow) var(--ease-emph), opacity var(--d-slow);
}
.snackbar.show { transform: translate(-50%, 0); opacity: 1; }
.snackbar-action { color: var(--g-yellow); font-family: var(--font-display); font-weight: 500; padding: 6px 10px; border-radius: 8px; }
.snackbar-action:hover { background: rgba(255,255,255,.08); }

/* ---------- ADMIN ---------- */
.admin { display: grid; grid-template-columns: 1fr; min-height: 100vh; }
@media (min-width: 960px) { .admin { grid-template-columns: var(--sidebar-w) 1fr; } }
.admin-side {
  background: #fff; border-right: 1px solid var(--gray-200);
  padding: 24px 12px; display: flex; flex-direction: column; gap: 8px;
  position: sticky; top: 0; max-height: 100vh; overflow-y: auto;
}
.admin-side__brand { padding: 12px; margin-bottom: 12px; }
.admin-side__group { font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--gray-500); padding: 12px 12px 4px; font-weight: 600; }
.admin-side__link {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: var(--r-xs);
  color: var(--gray-700); font-family: var(--font-display); font-weight: 500; font-size: .9375rem;
  transition: color var(--d-med), background var(--d-med);
}
.admin-side__link:hover { background: var(--gray-50); color: var(--gray-900); text-decoration: none; }
.admin-side__link--active { background: var(--g-blue-50); color: var(--g-blue); font-weight: 600; }
.admin-side__link.muted { opacity: .5; pointer-events: none; }
.admin-main { display: flex; flex-direction: column; min-width: 0; }
.admin-top { height: var(--header-h); display: flex; align-items: center; gap: 16px; padding: 0 24px; background: #fff; border-bottom: 1px solid var(--gray-200); position: sticky; top: 0; z-index: 10; }
.admin-top__title { font-family: var(--font-display); font-weight: 600; font-size: 1.125rem; }
.admin-top__spacer { flex: 1; }
.admin-content { padding: 32px; flex: 1; }
.admin-side__toggle { display: inline-flex; }
@media (min-width: 960px) { .admin-side__toggle { display: none; } }
@media (max-width: 959px) {
  .admin-side { position: fixed; left: 0; top: 0; bottom: 0; width: 280px; transform: translateX(-100%); transition: transform var(--d-slow); z-index: 60; max-height: 100vh; }
  .admin-side[data-open="true"] { transform: translateX(0); box-shadow: var(--elev-4); }
}

.page-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.page-header h1 { font-size: 1.75rem; }
.page-header__sub { color: var(--gray-700); margin-top: 4px; font-size: .9375rem; }

/* ---------- TABLES ---------- */
.table-wrap { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--r-md); overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; font-size: .9375rem; }
.table th, .table td { padding: 12px 16px; text-align: left; vertical-align: middle; }
.table th { background: var(--gray-50); font-family: var(--font-display); font-weight: 600; font-size: .75rem; text-transform: uppercase; letter-spacing: .04em; color: var(--gray-700); white-space: nowrap; }
.table td { white-space: nowrap; }
.table td.col-wrap { white-space: normal; min-width: 220px; }
.table tbody tr { border-top: 1px solid var(--gray-100); }
.table tbody tr:hover { background: var(--gray-50); }
.table__actions { display: flex; gap: 4px; justify-content: flex-end; }
.table code { font-family: var(--font-mono); font-size: .85em; color: var(--gray-700); }
.table .date-cell { color: var(--gray-700); font-size: .8125rem; font-feature-settings: "tnum" 1; line-height: 1.4; }
.table .date-cell time { display: block; }
.table .date-cell .time-of-day { color: var(--gray-500); }

/* ---------- PILLS ---------- */
.pill { display: inline-flex; align-items: center; gap: 4px; padding: 2px 12px; font-family: var(--font-display); font-size: .75rem; font-weight: 500; border-radius: var(--r-pill); background: var(--gray-100); color: var(--gray-700); }
.pill--primary { background: var(--g-blue-50); color: var(--g-blue); }
.pill--accent, .pill--success { background: var(--g-green-50); color: #137333; }
.pill--warning { background: var(--g-yellow-50); color: #b06000; }
.pill--error { background: var(--g-red-50); color: #b31412; }

/* ---------- ALERTS ---------- */
.alert { display: flex; gap: 12px; align-items: flex-start; padding: 16px 20px; border-radius: var(--r-md); border: 1px solid var(--gray-200); background: #fff; margin-bottom: 16px; }
.alert__icon { flex-shrink: 0; margin-top: 2px; }
.alert--success { background: var(--g-green-50); border-color: var(--g-green); color: #137333; }
.alert--warning { background: var(--g-yellow-50); border-color: var(--g-yellow); color: #b06000; }
.alert--error { background: var(--g-red-50); border-color: var(--g-red); color: #b31412; }
.alert--info { background: var(--g-blue-50); border-color: var(--g-blue); color: var(--g-blue); }

/* ---------- EMPTY STATE ---------- */
.empty { text-align: center; padding: 64px 24px; background: #fff; border: 1px dashed var(--gray-300); border-radius: var(--r-md); }
.empty__icon { width: 72px; height: 72px; display: grid; place-items: center; margin: 0 auto 16px; border-radius: 50%; background: var(--gray-100); color: var(--gray-700); }
.empty__title { font-family: var(--font-display); font-size: 1.25rem; font-weight: 600; }
.empty__desc { color: var(--gray-700); margin-top: 8px; max-width: 44ch; margin-inline: auto; }
.empty__cta { margin-top: 24px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.coming-soon { text-align: center; padding: 96px 24px; max-width: 640px; margin: 0 auto; }
.coming-soon__icon { width: 88px; height: 88px; display: grid; place-items: center; margin: 0 auto 24px; border-radius: var(--r-lg); background: var(--g-blue); color: #fff; box-shadow: var(--elev-3); }
.coming-soon__title { font-size: clamp(1.75rem, 2vw + 1rem, 2.5rem); }
.coming-soon__body { color: var(--gray-700); margin-top: 16px; font-size: 1.0625rem; line-height: 1.6; }
.coming-soon__cta { margin-top: 32px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.file-row { display: flex; align-items: center; gap: 12px; padding: 12px 16px; background: var(--gray-50); border-radius: var(--r-sm); margin-bottom: 8px; }
.file-row__name { flex: 1; font-family: var(--font-mono); font-size: .85rem; word-break: break-all; }
.file-row__size { color: var(--gray-700); font-size: .8125rem; }

/* ---------- COURSE CARD (PDF list) ---------- */
.course-grid { display: grid; gap: 24px; grid-template-columns: repeat(auto-fill, minmax(280px, 360px)); margin-top: 24px; justify-content: start; }
.course { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--gray-200); border-radius: var(--r-md); overflow: hidden; text-decoration: none; color: inherit; transition: transform var(--d-med) var(--ease-emph), box-shadow var(--d-med); }
.course:hover { transform: translateY(-4px); box-shadow: var(--elev-3); text-decoration: none; }
.course__thumb { height: 160px; display: grid; place-items: center; background: linear-gradient(135deg, var(--g-blue-50), var(--g-green-50)); position: relative; }
.course__thumb-icon { width: 64px; height: 64px; display: grid; place-items: center; background: #fff; border-radius: 18px; color: var(--g-blue); box-shadow: var(--elev-2); }
.course__body { padding: 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.course__meta { display: flex; gap: 8px; align-items: center; font-size: .8125rem; color: var(--gray-700); flex-wrap: wrap; }
.course__title { font-family: var(--font-display); font-size: 1.125rem; font-weight: 600; }
.course__desc { color: var(--gray-700); font-size: .9375rem; flex: 1; }
.course__foot { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--gray-200); }

.pdf-wrap { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--r-md); overflow: hidden; box-shadow: var(--elev-2); margin-top: 24px; }
.pdf-wrap__head { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--gray-200); flex-wrap: wrap; gap: 12px; }
.pdf-wrap__title { font-family: var(--font-display); font-size: 1.0625rem; font-weight: 600; display: flex; gap: 8px; align-items: center; }
.pdf-frame { width: 100%; min-height: 720px; border: 0; background: var(--gray-50); display: block; }

/* ---------- MARKDOWN ---------- */
.markdown h2 { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; margin-top: 48px; margin-bottom: 16px; letter-spacing: -0.02em; }
.markdown h3 { font-family: var(--font-display); font-size: 1.125rem; font-weight: 600; margin-top: 24px; margin-bottom: 12px; }
.markdown p { margin-bottom: 16px; }
.markdown ul, .markdown ol { margin-bottom: 16px; padding-left: 32px; }
.markdown li { margin-bottom: 8px; }
.markdown li::marker { color: var(--g-blue); }
.markdown strong { color: var(--gray-900); font-weight: 700; }
.markdown a { color: var(--g-blue); font-weight: 500; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; }
.markdown blockquote { margin: 24px 0; padding: 16px 20px; border-left: 3px solid var(--g-blue); background: var(--g-blue-50); border-radius: 0 var(--r-sm) var(--r-sm) 0; }
.markdown blockquote p:last-child { margin-bottom: 0; }
.markdown code { font-family: var(--font-mono); font-size: .9em; padding: 2px 6px; background: var(--gray-100); border: 1px solid var(--gray-200); border-radius: 4px; color: var(--gray-900); }
.markdown pre { margin: 24px 0; padding: 24px; background: var(--gray-900); color: #e8eaed; border-radius: var(--r-md); overflow-x: auto; font-size: .9rem; line-height: 1.7; }
.markdown pre code { background: transparent; border: 0; padding: 0; color: inherit; font-size: inherit; }
.markdown table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: .9375rem; border: 1px solid var(--gray-200); border-radius: var(--r-md); overflow: hidden; }
.markdown table th { background: var(--gray-50); font-family: var(--font-display); font-weight: 600; text-align: left; padding: 12px; border-bottom: 1px solid var(--gray-200); }
.markdown table td { padding: 12px; border-top: 1px solid var(--gray-200); }
.markdown table code { font-size: .85em; }

.markdown pre code .token.comment, .code-block .token.comment { color: #8ab4f8; opacity: .6; font-style: italic; }
.markdown pre code .token.keyword, .code-block .token.keyword { color: #f28b82; font-weight: 600; }
.markdown pre code .token.string, .code-block .token.string { color: #fdd663; }
.markdown pre code .token.number, .code-block .token.number { color: #aecbfa; }
.markdown pre code .token.function, .code-block .token.function { color: #c58af9; }
.markdown pre code .token.operator, .markdown pre code .token.punctuation, .code-block .token.operator, .code-block .token.punctuation { color: #e8eaed; }
.markdown pre code .token.class-name, .code-block .token.class-name { color: #f9ab00; }

.code-block { margin: 0; padding: 24px; background: var(--gray-900); color: #e8eaed; border-radius: var(--r-md); overflow-x: auto; font-size: .9rem; line-height: 1.7; font-family: var(--font-mono); }
.code-block code { font-family: inherit; background: transparent; border: 0; padding: 0; color: inherit; }

.link-underline { position: relative; color: var(--gray-900); font-weight: 500; }
.link-underline::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; border-radius: 2px; background: var(--g-blue); transform: scaleX(0); transform-origin: right; transition: transform var(--d-slow); }
.link-underline:hover::after { transform: scaleX(1); transform-origin: left; }
.link-underline:hover { text-decoration: none; }

.cta-band { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; padding: 48px; background: var(--gradient-hero); border-radius: var(--r-lg); box-shadow: var(--elev-3); }

/* ---------- ANIMATIONS ----------
   Default visible. JS opt-in via .js-stagger / .js-fade-up to hide initially. */
.js-stagger > * { opacity: 0; transform: translateY(12px); transition: opacity var(--d-slow) var(--ease-emph), transform var(--d-slow) var(--ease-emph); }
.js-stagger.in > * { opacity: 1; transform: none; }
.js-stagger.in > *:nth-child(1) { transition-delay: 40ms; }
.js-stagger.in > *:nth-child(2) { transition-delay: 100ms; }
.js-stagger.in > *:nth-child(3) { transition-delay: 160ms; }
.js-stagger.in > *:nth-child(4) { transition-delay: 220ms; }
.js-stagger.in > *:nth-child(5) { transition-delay: 280ms; }
.js-stagger.in > *:nth-child(6) { transition-delay: 340ms; }
.js-fade-up { opacity: 0; transform: translateY(16px); transition: opacity var(--d-slow) var(--ease-emph), transform var(--d-slow) var(--ease-emph); }
.js-fade-up.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* ===== Code runner & laboratoare =====================================
   Editor C++ + buton Ruleaza/Trimite + panou output + rezultate teste.
   Folosit in templates/lectii/lesson.php (sectiunile .lesson__example si .labs).
*/

/* Forteaza atributul HTML `hidden` sa invinga regulile noastre `display: flex/grid`.
   Fara asta, .lab__solved[hidden] / .code-output[hidden] raman vizibile. */
[hidden] { display: none !important; }

.code-editor {
  display: block; width: 100%;
  font-family: var(--font-mono);
  font-size: .9rem; line-height: 1.55;
  padding: 14px 16px;
  background: var(--gray-900);
  color: #e8eaed;
  border: 1px solid var(--gray-300);
  border-radius: var(--r-sm);
  resize: vertical;
  white-space: pre;
  overflow-wrap: normal;
  overflow-x: auto;
  tab-size: 4;
  -moz-tab-size: 4;
}
.code-editor:focus {
  outline: 2px solid var(--g-blue);
  outline-offset: -1px;
}

.code-stdin { margin-top: var(--space-3); }
.code-stdin > summary {
  cursor: pointer; font-size: .85rem; color: var(--text-muted);
  padding: 6px 0;
}
.code-stdin__input {
  display: block; width: 100%;
  font-family: var(--font-mono); font-size: .85rem;
  padding: 8px 12px; margin-top: 6px;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--gray-300); border-radius: var(--r-xs);
  resize: vertical;
}

.code-actions {
  display: flex; gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-3);
}

.code-output {
  margin-top: var(--space-3);
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-sm);
  overflow: hidden;
}
.code-output__head {
  display: flex; gap: var(--space-3); align-items: center;
  padding: 10px 14px;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
  font-size: .85rem;
}
.code-output__status {
  font-weight: 600; padding: 2px 10px; border-radius: var(--r-pill); font-size: .8rem;
}
.code-output__status--ok  { background: var(--g-green-50); color: #137333; }
.code-output__status--err { background: var(--g-red-50);   color: #c5221f; }
.code-output__meta { color: var(--text-muted); font-family: var(--font-mono); font-size: .8rem; }
.code-output__section { padding: 10px 14px; border-top: 1px solid var(--gray-100); }
.code-output__section:first-of-type { border-top: 0; }
.code-output__label {
  display: block; font-size: .75rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-muted); margin-bottom: 4px;
}
.code-output pre {
  font-family: var(--font-mono); font-size: .85rem; line-height: 1.5;
  white-space: pre-wrap; word-break: break-word;
  margin: 0; padding: 0; background: transparent; color: var(--text);
}
.code-output__loading {
  padding: 14px; text-align: center; color: var(--text-muted); font-size: .9rem;
}
.code-output__loading::before {
  content: "⏳ "; font-size: 1rem; margin-right: 4px;
}

/* ----- Laboratoare ----- */
.labs {
  margin-top: var(--space-7);
  padding-top: var(--space-7);
  border-top: 2px solid var(--gray-200);
}
.labs__head { margin-bottom: var(--space-5); }
.labs__title {
  display: flex; gap: var(--space-2); align-items: center;
  font-family: var(--font-display); font-size: 1.5rem; margin: 0 0 6px;
}

.lab {
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-md);
  padding: var(--space-5);
  margin-bottom: var(--space-5);
}
.lab--solved { border-color: var(--g-green); box-shadow: 0 0 0 2px var(--g-green-50) inset; }

.lab__head {
  display: flex; justify-content: space-between; align-items: flex-start; gap: var(--space-3);
  margin-bottom: var(--space-3);
}
.lab__num {
  display: inline-block; font-size: .7rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--g-blue); margin-bottom: 2px;
}
.lab__title { font-family: var(--font-display); font-size: 1.15rem; margin: 0; }

.lab__diff {
  display: inline-block; font-size: .75rem; font-weight: 600;
  padding: 4px 10px; border-radius: var(--r-pill);
}
.lab__diff--easy   { background: var(--g-green-50);  color: #137333; }
.lab__diff--medium { background: var(--g-yellow-50); color: #b06000; }
.lab__diff--hard   { background: var(--g-red-50);    color: #c5221f; }

.lab__instructions {
  margin-bottom: var(--space-3);
  font-size: .95rem; line-height: 1.6;
}
.lab__instructions p:last-child { margin-bottom: 0; }
.lab__instructions code {
  font-family: var(--font-mono); font-size: .9em; padding: 1px 6px;
  background: var(--gray-100); border: 1px solid var(--gray-200); border-radius: 4px;
}

.lab__editor { margin-bottom: var(--space-3); }

.lab__hints {
  margin-top: var(--space-3);
  background: var(--g-yellow-50);
  border: 1px solid #fde293;
  border-radius: var(--r-sm);
  padding: 12px 14px;
}
.lab__hint {
  display: flex; gap: 8px; align-items: flex-start;
  margin: 0 0 8px; font-size: .9rem; line-height: 1.5;
}
.lab__hint:last-child { margin-bottom: 0; }
.lab__hint .icon { color: #b06000; flex-shrink: 0; margin-top: 2px; }

.lab__results { margin-top: var(--space-3); }
.lab__results-title {
  font-size: .85rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-muted); margin: 0 0 8px;
}
.lab__results-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.lab__test {
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--gray-300);
  border-radius: var(--r-xs);
  padding: 10px 14px;
  background: var(--surface);
}
.lab__test--pass { border-left-color: var(--g-green); background: var(--g-green-50); }
.lab__test--fail { border-left-color: var(--g-red);   background: var(--g-red-50); }
.lab__test-head { display: flex; justify-content: space-between; gap: 8px; font-size: .9rem; }
.lab__test-body {
  margin-top: 8px; display: grid; gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}
.lab__test-label {
  display: block; font-size: .7rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted);
}
.lab__test pre {
  font-family: var(--font-mono); font-size: .8rem;
  white-space: pre-wrap; word-break: break-word;
  margin: 4px 0 0; padding: 6px 8px;
  background: var(--surface); border: 1px solid var(--gray-200); border-radius: 4px;
  max-height: 140px; overflow-y: auto;
}

.lab__solved {
  display: flex; gap: 10px; align-items: center;
  margin-top: var(--space-3);
  padding: 12px 16px;
  background: var(--g-green-50);
  border: 1px solid var(--g-green);
  border-radius: var(--r-sm);
  color: #137333;
  font-size: .95rem;
}
.lab__solved .icon { color: var(--g-green); }

/* ----- Dark mode adjustments ----- */
[data-theme="dark"] .code-output { background: #1f2329; border-color: #2d3138; }
[data-theme="dark"] .code-output__head { background: #14171c; border-bottom-color: #2d3138; }
[data-theme="dark"] .code-output__status--ok  { background: rgba(52,168,83,.18); color: #81c995; }
[data-theme="dark"] .code-output__status--err { background: rgba(234,67,53,.18); color: #f28b82; }
[data-theme="dark"] .code-output pre { color: #e8eaed; }
[data-theme="dark"] .code-stdin__input { background: #14171c; color: #e8eaed; border-color: #2d3138; }
[data-theme="dark"] .lab { background: #1f2329; border-color: #2d3138; }
[data-theme="dark"] .lab__test { background: #14171c; border-color: #2d3138; }
[data-theme="dark"] .lab__test pre { background: #1f2329; border-color: #2d3138; color: #e8eaed; }
[data-theme="dark"] .lab__test--pass { background: rgba(52,168,83,.10); }
[data-theme="dark"] .lab__test--fail { background: rgba(234,67,53,.10); }
[data-theme="dark"] .lab__hints { background: rgba(251,188,4,.10); border-color: rgba(251,188,4,.35); color: #fde293; }
[data-theme="dark"] .lab__solved { background: rgba(52,168,83,.15); color: #81c995; }
[data-theme="dark"] .lab__instructions code { background: #14171c; border-color: #2d3138; }

@media (max-width: 640px) {
  .code-editor { font-size: .85rem; }
  .lab { padding: var(--space-4); }
  .lab__head { flex-direction: column; align-items: flex-start; }
}

/* ===== Laborator (sectiune /laborator) =================================== */

.lab-index__head {
  text-align: center;
  margin-bottom: var(--space-7);
  padding-block: var(--space-7);
}
.lab-index__head .progress-card {
  max-width: 480px;
  margin: var(--space-5) auto 0;
}
.lab-index__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin: var(--space-3) 0;
}

.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-7);
}

.lab-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-md);
  text-decoration: none;
  color: var(--text);
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.lab-card:hover {
  border-color: var(--g-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(26,115,232,.1);
}
.lab-card--solved {
  border-left: 4px solid var(--g-green);
}

.lab-card__head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.lab-card__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  color: var(--g-blue);
  background: var(--g-blue-50);
  padding: 2px 8px;
  border-radius: var(--r-pill);
}
.lab-card__diff {
  font-size: .7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--r-pill);
}
.lab-card__solved-badge {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--g-green);
  font-size: .8rem;
}
.lab-card__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: var(--space-1) 0 0;
  line-height: 1.35;
}
.lab-card__meta {
  display: flex;
  gap: var(--space-3);
  margin-top: auto;
  padding-top: var(--space-2);
  font-size: .8rem;
  color: var(--text-muted);
}
.lab-card__meta span { display: inline-flex; align-items: center; gap: 4px; }

.lab-page__head-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-2);
  font-size: .9rem;
}

[data-theme="dark"] .lab-card { background: #1f2329; border-color: #2d3138; }
[data-theme="dark"] .lab-card:hover { border-color: var(--g-blue); }
[data-theme="dark"] .lab-card__num { background: rgba(26,115,232,.18); }

/* ===== CodeMirror — integrare cu temele oradeinfo ====================== */

.CodeMirror {
  font-family: var(--font-mono) !important;
  font-size: .9rem !important;
  line-height: 1.55 !important;
  border: 1px solid var(--gray-300);
  border-radius: var(--r-sm);
  height: auto !important;
}
.CodeMirror-focused { outline: 2px solid var(--g-blue); outline-offset: -1px; }

[data-theme="dark"] .CodeMirror { border-color: #2d3138; }

/* ----- Tema LIGHT pentru editor (paleta Tomorrow Light) -----
   Fundal alb-curat, sintaxa colorata distinct. Token classes vin de la
   modul clike din CodeMirror — vezi cm-* mai jos.
*/
.cm-s-default.CodeMirror {
  background: #fafbfc;
  color: #2d2f33;
}
.cm-s-default .CodeMirror-gutters {
  background: #f1f3f4;
  border-right: 1px solid var(--gray-200);
  color: var(--gray-500);
}
.cm-s-default .CodeMirror-linenumber { color: #aab2bd; }
.cm-s-default .CodeMirror-cursor { border-left: 2px solid #1a73e8; }

.cm-s-default .cm-comment   { color: #8e908c; font-style: italic; }
.cm-s-default .cm-string    { color: #718c00; }
.cm-s-default .cm-string-2  { color: #718c00; }
.cm-s-default .cm-number    { color: #f5871f; }
.cm-s-default .cm-keyword   { color: #8959a8; font-weight: 600; }
.cm-s-default .cm-atom      { color: #f5871f; font-weight: 600; }
.cm-s-default .cm-def       { color: #4271ae; font-weight: 600; }
.cm-s-default .cm-variable  { color: #2d2f33; }
.cm-s-default .cm-variable-2{ color: #c82829; }
.cm-s-default .cm-variable-3,
.cm-s-default .cm-type      { color: #c82829; font-weight: 600; }
.cm-s-default .cm-property  { color: #4271ae; }
.cm-s-default .cm-operator  { color: #3e999f; }
.cm-s-default .cm-meta      { color: #8959a8; }
.cm-s-default .cm-builtin   { color: #4271ae; }
.cm-s-default .cm-bracket   { color: #2d2f33; }
.cm-s-default .cm-tag       { color: #c82829; }
.cm-s-default .cm-attribute { color: #4271ae; }

/* Active line — foarte subtil, sa nu obscurizeze textul */
.cm-s-default .CodeMirror-activeline-background { background: rgba(26,115,232,.06); }
.cm-s-default .CodeMirror-matchingbracket { color: #1a73e8 !important; background: rgba(26,115,232,.12); }
.cm-s-default ::selection { background: rgba(26,115,232,.20); }
.cm-s-default .CodeMirror-selected { background: rgba(26,115,232,.18) !important; }
.cm-s-default .CodeMirror-focused .CodeMirror-selected { background: rgba(26,115,232,.22) !important; }

/* In dark mode, fixam si active-line + selectie peste tema dracula */
.cm-s-dracula .CodeMirror-activeline-background { background: rgba(98,114,164,.18); }
.cm-s-dracula .CodeMirror-selected { background: rgba(98,114,164,.35) !important; }
.cm-s-dracula .CodeMirror-focused .CodeMirror-selected { background: rgba(98,114,164,.45) !important; }


/* ===== Prism — overrides minore pentru a se potrivi cu blocurile noastre */
pre.code-block[class*="language-"],
.markdown pre[class*="language-"] {
  border-radius: var(--r-sm);
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: .85rem;
}

/* ===== Galerie materiale + Lightbox ====================================
   Folosita in templates/courses/show.php pentru a afisa imaginile uploadate.
*/

.material-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}
.material-gallery__item {
  position: relative;
  display: block;
  aspect-ratio: 4 / 3;
  border-radius: var(--r-sm);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  background: var(--gray-100);
  text-decoration: none;
  color: var(--text);
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.material-gallery__item:hover {
  border-color: var(--g-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(26,115,232,.15);
}
.material-gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.material-gallery__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 6px 10px;
  font-size: .8rem;
  color: #fff;
  background: linear-gradient(to top, rgba(0,0,0,.65), rgba(0,0,0,0));
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

[data-theme="dark"] .material-gallery__item { background: #14171c; border-color: #2d3138; }

/* ----- Lightbox overlay ----- */
.lightbox {
  position: fixed; inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,.92);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  cursor: zoom-out;
}
.lightbox__figure {
  margin: 0;
  max-width: 100%;
  max-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.lightbox__img {
  max-width: 100%;
  max-height: calc(100vh - 100px);
  object-fit: contain;
  border-radius: 4px;
  cursor: default;
  box-shadow: 0 10px 40px rgba(0,0,0,.5);
}
.lightbox__caption {
  color: #e8eaed;
  font-size: .9rem;
  text-align: center;
  max-width: 80vw;
  word-break: break-word;
}
.lightbox__close,
.lightbox__nav {
  position: absolute;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  color: #fff;
  width: 44px; height: 44px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background .15s ease;
}
.lightbox__close:hover,
.lightbox__nav:hover { background: rgba(255,255,255,.25); }
.lightbox__close { top: 16px; right: 16px; }
.lightbox__nav--prev { left: 16px; top: 50%; transform: translateY(-50%); }
.lightbox__nav--next { right: 16px; top: 50%; transform: translateY(-50%); }

@media (max-width: 640px) {
  .material-gallery { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}

/* ============================================================
 * Sectiunea Exersare — exercitii ghidate pas-cu-pas
 * ============================================================ */
.ex-index__head {
  text-align: center;
  margin-bottom: var(--space-7);
}
.ex-index__title {
  font-family: var(--font-display, inherit);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  margin: var(--space-3) 0 var(--space-2);
}
.ex-card { position: relative; }

/* page */
.ex-page .lesson__body.ex-explain {
  background: var(--card-bg, rgba(0,0,0,.02));
  border-left: 3px solid var(--accent, #3b82f6);
  padding: var(--space-4) var(--space-5);
  border-radius: 8px;
  margin-bottom: var(--space-5);
}
[data-theme="dark"] .ex-page .lesson__body.ex-explain {
  background: rgba(255,255,255,.04);
}

.ex-task { display: block; }
.ex-task__editor-wrap { margin-bottom: var(--space-3); }

/* Feedback panel (diagnostice traduse in romana) */
.ex-feedback {
  margin-top: var(--space-4);
  border: 1px solid rgba(245, 158, 11, .35);
  background: rgba(245, 158, 11, .08);
  border-radius: 10px;
  padding: var(--space-4) var(--space-5);
}
[data-theme="dark"] .ex-feedback {
  background: rgba(245, 158, 11, .12);
}
.ex-feedback__title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-3);
  font-size: 1rem;
  color: #b45309;
}
[data-theme="dark"] .ex-feedback__title { color: #fcd34d; }

.ex-diag {
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px dashed rgba(0,0,0,.1);
}
.ex-diag:last-child { border-bottom: 0; margin-bottom: 0; padding-bottom: 0; }
.ex-diag__title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  margin-bottom: var(--space-2);
}
.ex-diag__msg { margin-bottom: var(--space-2); line-height: 1.55; }
.ex-diag__fix {
  background: rgba(34, 197, 94, .1);
  border-left: 3px solid #22c55e;
  padding: var(--space-2) var(--space-3);
  border-radius: 6px;
  margin-top: var(--space-2);
}
[data-theme="dark"] .ex-diag__fix { background: rgba(34, 197, 94, .15); }
.ex-diag__fix-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-weight: 600;
  font-size: .9rem;
  color: #15803d;
}
[data-theme="dark"] .ex-diag__fix-label { color: #86efac; }
.ex-diag__fix pre {
  margin: var(--space-2) 0 0;
  background: rgba(0,0,0,.04);
  padding: var(--space-2) var(--space-3);
  border-radius: 4px;
  white-space: pre-wrap;
  font-family: 'Roboto Mono', monospace;
  font-size: .9rem;
}
[data-theme="dark"] .ex-diag__fix pre { background: rgba(0,0,0,.3); }
.ex-diag__line {
  margin-top: var(--space-2);
  font-size: .85rem;
  color: var(--text-muted, #6b7280);
}

.ex-show-solution { opacity: .7; }
.ex-show-solution:hover { opacity: 1; }