/* ═══════════════════════════════════════════════════════
   shared/home.css — Course Hub Index Page Shared Styles
   Override :root variables per hub for theming.
   ═══════════════════════════════════════════════════════ */

:root {
  --home-hero-bg: linear-gradient(145deg, rgba(6,22,14,0.96), rgba(14,46,28,0.9));
  --home-hero-border: rgba(80,200,160,0.16);
  --home-hero-shadow: 0 52px 120px rgba(4,12,8,0.34);
  --home-hero-glow1: rgba(5,150,105,0.22);
  --home-hero-glow2: rgba(6,182,212,0.18);
  --home-hero-image: url("shared/assets/nlp-hero.png");
  --home-badge-color: #d1fae5;
  --home-badge-border: rgba(209,250,229,0.14);
  --home-h1: #ecfdf5;
  --home-subtitle: rgba(220,252,235,0.8);
  --home-muted: rgba(220,252,235,0.56);
  --home-strong: #ecfdf5;
  --home-border: rgba(209,250,229,0.12);
  --home-border-dim: rgba(209,250,229,0.08);
  --home-accent: #059669;
  --home-accent-14: rgba(5,150,105,0.14);
  --home-accent-color: #a7f3d0;
  --home-accent2: rgba(6,182,212,0.92);
  --home-pipe-grad: linear-gradient(90deg, rgba(5,150,105,0.08), transparent 42%, rgba(6,182,212,0.06));
  --home-pipe-text: rgba(220,252,235,0.7);
  --home-pipe-label: rgba(220,252,235,0.62);
  --home-metric-bg: rgba(6,22,14,0.26);
  --home-metric-span: #a7f3d0;
  --home-metric-small: rgba(220,252,235,0.65);
  --home-mission-bg: linear-gradient(180deg, rgba(240,253,244,0.92), rgba(220,252,231,0.82));
  --home-mission-border: rgba(5,150,105,0.12);
  --home-mission-shadow: 0 24px 54px rgba(4,12,8,0.08);
  --home-mission-glow1: rgba(5,150,105,0.14);
  --home-mission-glow2: rgba(6,182,212,0.14);
  --home-mission-kicker: #047857;
  --home-mission-heading: #052e16;
  --home-mission-pill-bg: rgba(5,150,105,0.1);
  --home-mission-pill-border: rgba(5,150,105,0.18);
  --home-mission-pill-color: #047857;
  --home-card-glow: rgba(5,150,105,0.16);
  --home-card-bg: linear-gradient(180deg, rgba(240,253,244,0.96), rgba(220,252,231,0.9));
  --home-card-border: rgba(5,150,105,0.12);
  --home-card-shadow: 0 20px 44px rgba(4,12,8,0.08);
  --home-card-before1: rgba(5,150,105,0.14);
  --home-card-before2: rgba(5,150,105,0.08);
  --home-card-before3: rgba(6,182,212,0.08);
  --home-card-before4: rgba(5,150,105,0.12);
  --home-card-bar: linear-gradient(90deg, #059669, rgba(6,182,212,0.84));
  --home-card-hover-border: rgba(5,150,105,0.32);
  --home-card-hover-shadow: 0 30px 56px rgba(4,12,8,0.12);
  --home-chapter-num: #047857;
  --home-tag-bg: rgba(5,150,105,0.08);
  --home-tag-color: #047857;
  --home-tag-border: rgba(5,150,105,0.2);
  --home-tag-green-bg: rgba(16,185,129,0.1);
  --home-tag-green-color: #059669;
  --home-tag-green-border: rgba(16,185,129,0.2);
  --home-tag-alt-bg: rgba(6,182,212,0.1);
  --home-tag-alt-color: #0891b2;
  --home-tag-alt-border: rgba(6,182,212,0.2);
  --home-progress-border: rgba(5,150,105,0.08);
  --home-status-unstarted: rgba(5,150,105,0.08);
  --home-status-ip-bg: rgba(6,182,212,0.1);
  --home-status-ip-color: #0891b2;
  --home-status-master-bg: rgba(5,150,105,0.12);
  --home-status-master-color: #059669;
  --home-meter-bg: rgba(5,150,105,0.08);
  --home-meter-fill: linear-gradient(90deg, #059669, rgba(6,182,212,0.92));
  --home-meter-shadow: 0 0 18px rgba(5,150,105,0.25);
  --home-link-color: #047857;
  --home-link-hover: #059669;
  --home-link-border: rgba(5,150,105,0.08);
  --home-score-bg: rgba(6,182,212,0.15);
  --home-score-color: #0891b2;
  --home-lang-bg: rgba(6,22,14,0.72);
  --home-lang-border: rgba(209,250,229,0.16);
  --home-lang-color: #d1fae5;
  --home-lang-shadow: 0 16px 28px rgba(4,12,8,0.18);
  --home-lang-hover: rgba(5,150,105,0.18);
}

body { display: flex; flex-direction: column; min-height: 100vh; }
.home-wrap {
  position: relative; flex: 1; display: flex; flex-direction: column;
  padding: 1.25rem 1.5rem 3rem; max-width: 1280px; margin: 0 auto; width: 100%;
}
.home-header {
  width: 100%; margin: 2rem 0 0; padding: clamp(2rem, 4vw, 4rem);
  min-height: 31rem; border-radius: 32px; position: relative; overflow: hidden;
  display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 2rem; align-items: end;
  background: var(--home-hero-bg);
  border: 1px solid var(--home-hero-border);
  box-shadow: var(--home-hero-shadow);
}
.home-header::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 18% 18%, var(--home-hero-glow1), transparent 20%),
    radial-gradient(circle at 88% 12%, var(--home-hero-glow2), transparent 24%),
    linear-gradient(180deg, rgba(255,255,255,0.03), transparent 50%);
  pointer-events: none;
}
.home-header::after {
  content: ""; position: absolute; inset: 0;
  background: var(--home-hero-image) center / cover no-repeat;
  opacity: 0.32; pointer-events: none;
  mask-image: linear-gradient(to left, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.4) 50%, transparent 75%);
  -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.4) 50%, transparent 75%);
}
.home-copy, .home-visual { position: relative; z-index: 1; }
.home-copy { max-width: 40rem; align-self: start; }
.home-header .course-badge {
  display: inline-flex; align-items: center; gap: 0.45rem;
  background: rgba(255,255,255,0.08); color: var(--home-badge-color);
  padding: 0.5rem 1rem; border-radius: 999px; font-size: 0.78rem;
  font-weight: 700; letter-spacing: 0.08em; margin-bottom: 1.2rem;
  border: 1px solid var(--home-badge-border); text-transform: uppercase;
}
.home-header h1 {
  font-family: var(--font-display); font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 700; margin: 0; line-height: 0.98; letter-spacing: -0.03em;
  color: var(--home-h1);
}
.home-header .subtitle {
  color: var(--home-subtitle); font-size: 1.08rem;
  margin-top: 1.1rem; max-width: 39rem; line-height: 1.75;
}
.hero-metrics { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.6rem; }
.hero-metric {
  min-width: 12rem; padding: 0.85rem 1rem; border-radius: 18px;
  border: 1px solid var(--home-border); background: rgba(255,255,255,0.05);
}
.hero-metric .label {
  display: block; font-family: var(--font-mono); text-transform: uppercase;
  letter-spacing: 0.08em; font-size: 0.68rem; color: var(--home-muted);
}
.hero-metric strong {
  display: block; margin-top: 0.4rem; color: var(--home-strong);
  font-size: 0.98rem; line-height: 1.4;
}
.home-tool-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }
.tool-pill {
  display: inline-flex; align-items: center; gap: 0.55rem;
  padding: 0.8rem 1.1rem; border-radius: 999px; text-decoration: none;
  font-size: 0.88rem; font-weight: 700;
  transition: transform var(--transition), border-color var(--transition), background var(--transition), color var(--transition);
  border: 1px solid var(--home-border); background: rgba(255,255,255,0.05);
  color: var(--home-strong);
}
.tool-pill:hover { transform: translateY(-2px); background: rgba(255,255,255,0.1); }

.home-visual { display: grid; gap: 1rem; align-self: stretch; align-content: end; }
.pipeline-card, .visual-metrics {
  border-radius: 28px; border: 1px solid var(--home-border);
  background: rgba(255,255,255,0.06);
}
.pipeline-card { padding: 1.25rem; position: relative; overflow: hidden; }
.pipeline-card::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.06), transparent 45%), var(--home-pipe-grad);
  pointer-events: none;
}
.pipeline-label {
  position: relative; z-index: 1; display: inline-flex; align-items: center; gap: 0.45rem;
  font-family: var(--font-mono); font-size: 0.74rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--home-pipe-label); margin-bottom: 1rem;
}
.pipeline-step {
  position: relative; z-index: 1; display: grid;
  grid-template-columns: 3.1rem 1fr; gap: 0.9rem; padding: 0.95rem 0;
}
.pipeline-step + .pipeline-step { border-top: 1px solid var(--home-border-dim); }
.step-index {
  display: inline-flex; align-items: center; justify-content: center;
  width: 3rem; height: 3rem; border-radius: 16px;
  background: var(--home-accent-14); color: var(--home-accent-color);
  font-family: var(--font-mono); font-size: 0.8rem; font-weight: 600;
}
.pipeline-step strong { display: block; color: var(--home-strong); font-size: 1rem; margin-bottom: 0.2rem; }
.pipeline-step p { color: var(--home-pipe-text); font-size: 0.88rem; line-height: 1.55; }
.visual-metrics { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.75rem; padding: 1rem; }
.visual-metric { padding: 0.9rem 0.8rem; border-radius: 20px; background: var(--home-metric-bg); border: 1px solid var(--home-border-dim); }
.visual-metric span { display: block; color: var(--home-metric-span); font-family: var(--font-display); font-size: 2rem; line-height: 1; }
.visual-metric small { display: block; margin-top: 0.45rem; color: var(--home-metric-small); font-size: 0.78rem; line-height: 1.4; }

.mission-panel {
  width: 100%; margin-top: 1.8rem; padding: 1.25rem; border-radius: 30px;
  position: relative; overflow: hidden;
  background: var(--home-mission-bg);
  border: 1px solid var(--home-mission-border);
  box-shadow: var(--home-mission-shadow);
}
.mission-panel::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 14% 20%, var(--home-mission-glow1), transparent 18%),
    radial-gradient(circle at 88% 14%, var(--home-mission-glow2), transparent 18%);
  pointer-events: none;
}
.mission-panel::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, transparent 0%, rgba(255,255,255,0.55) 48%, transparent 100%);
  transform: translateX(-140%); pointer-events: none; opacity: 0.16;
}
.mission-panel-head, .mission-grid { position: relative; z-index: 1; }
.mission-panel-head { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.mission-copy-head p {
  font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--home-mission-kicker); margin-bottom: 0.45rem;
}
.mission-copy-head h2 {
  font-family: var(--font-display); font-size: clamp(1.4rem, 3vw, 2.15rem);
  line-height: 1.05; letter-spacing: -0.03em; color: var(--home-mission-heading); max-width: 38rem;
}
.mission-pill {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.55rem 0.9rem; border-radius: 999px;
  background: var(--home-mission-pill-bg); border: 1px solid var(--home-mission-pill-border);
  color: var(--home-mission-pill-color); font-family: var(--font-mono);
  font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.08em; white-space: nowrap;
}
.mission-grid { display: grid; grid-template-columns: 1.45fr repeat(3, minmax(0, 1fr)); gap: 1rem; }
.mission-card {
  position: relative; overflow: hidden; padding: 1.15rem 1.1rem;
  border-radius: 24px; border: 1px solid var(--home-mission-border);
  background: rgba(255,255,255,0.64); box-shadow: inset 0 1px 0 rgba(255,255,255,0.45);
}
.mission-card::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at var(--card-x, 50%) var(--card-y, 50%), var(--home-card-glow), transparent 36%);
  opacity: 0; transition: opacity var(--transition); pointer-events: none;
}
.mission-card:hover::before { opacity: 1; }
.mission-card-wide { grid-column: span 1; }
.mission-label {
  display: block; font-family: var(--font-mono); font-size: 0.7rem;
  text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-dim); margin-bottom: 0.7rem;
}
.mission-value {
  font-family: var(--font-display); font-size: clamp(2rem, 5vw, 3rem);
  line-height: 0.92; letter-spacing: -0.04em; color: var(--home-mission-heading);
}
.mission-value.compact { font-size: 1.45rem; line-height: 1.05; }
.mission-note { margin-top: 0.5rem; color: var(--text-muted); font-size: 0.9rem; line-height: 1.55; }
.mission-rail { height: 12px; margin-top: 1rem; border-radius: 999px; background: var(--home-meter-bg); overflow: hidden; }
.mission-rail > span {
  display: block; height: 100%; width: 0%; border-radius: inherit;
  background: var(--home-meter-fill); box-shadow: var(--home-meter-shadow); transition: width 0.6s ease;
}
.mission-meta { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; margin-top: 0.85rem; color: var(--text-muted); font-size: 0.84rem; }
.mission-link { display: inline-flex; align-items: center; gap: 0.45rem; margin-top: 1rem; color: var(--home-link-color); font-weight: 700; text-decoration: none; }
.mission-link:hover { color: var(--home-link-hover); }
.mission-score { display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.28rem 0.6rem; border-radius: 999px; background: var(--home-score-bg); color: var(--home-score-color); font-size: 0.72rem; font-weight: 700; }

.home-section-head { width: 100%; display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin: 2.25rem 0 0.5rem; }
.home-section-copy p { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--home-mission-kicker); margin-bottom: 0.5rem; }
.home-section-copy h2 { font-family: var(--font-display); font-size: clamp(1.5rem, 3vw, 2.3rem); line-height: 1.1; letter-spacing: -0.03em; max-width: 34rem; color: var(--home-mission-heading); }

.chapters-grid { display: grid; grid-template-columns: 1fr; gap: 1.5rem; width: 100%; margin-top: 1.4rem; }
@media (min-width: 640px) { .chapters-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1040px) { .chapters-grid { grid-template-columns: repeat(3, 1fr); } }
.chapter-card {
  background: var(--home-card-bg); border: 1px solid var(--home-card-border);
  border-radius: 28px; padding: 1.65rem; min-height: 18rem;
  transition: all var(--transition); position: relative; overflow: hidden;
  text-decoration: none; color: inherit; display: flex; flex-direction: column;
  box-shadow: var(--home-card-shadow);
}
.chapter-card::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at var(--card-x, 50%) var(--card-y, 50%), var(--home-card-before1), transparent 32%),
    linear-gradient(135deg, var(--home-card-before2), transparent 42%, var(--home-card-before3)),
    radial-gradient(circle at top right, var(--home-card-before4), transparent 34%);
  pointer-events: none;
}
.chapter-card::after {
  content: ""; position: absolute; inset: 0 auto auto 0;
  width: 100%; height: 6px; background: var(--home-card-bar);
}
.chapter-card > * { position: relative; z-index: 1; }
.chapter-card:hover { border-color: var(--home-card-hover-border); transform: translateY(-6px); box-shadow: var(--home-card-hover-shadow); }
.chapter-num { font-family: var(--font-mono); font-size: 0.74rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.12em; color: var(--home-chapter-num); margin-bottom: 0.7rem; }
.chapter-card h2 { font-family: var(--font-display); font-size: 1.42rem; font-weight: 700; margin: 0 0 0.65rem; line-height: 1.1; letter-spacing: -0.03em; }
.chapter-card .desc { color: var(--text-muted); font-size: 0.94rem; line-height: 1.62; flex: 1; }
.chapter-card .tag-row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1rem; }
.chapter-card .tag { font-size: 0.7rem; padding: 0.28rem 0.7rem; border-radius: 999px; font-weight: 700; background: var(--home-tag-bg); color: var(--home-tag-color); border: 1px solid var(--home-tag-border); }
.chapter-card .tag.green { background: var(--home-tag-green-bg); color: var(--home-tag-green-color); border-color: var(--home-tag-green-border); }
.chapter-card .tag.purple { background: var(--home-tag-alt-bg); color: var(--home-tag-alt-color); border-color: var(--home-tag-alt-border); }
.chapter-progress { margin-top: 1rem; padding: 0.85rem 0.9rem; border-radius: 18px; background: rgba(255,255,255,0.58); border: 1px solid var(--home-progress-border); }
.chapter-progress-top { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; margin-bottom: 0.55rem; }
.chapter-status { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.24rem 0.58rem; border-radius: 999px; font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; }
.chapter-status.unstarted { background: var(--home-status-unstarted); color: var(--text-dim); }
.chapter-status.in-progress { background: var(--home-status-ip-bg); color: var(--home-status-ip-color); }
.chapter-status.mastered { background: var(--home-status-master-bg); color: var(--home-status-master-color); }
.chapter-pct { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-dim); }
.chapter-meter { height: 8px; border-radius: 999px; background: var(--home-meter-bg); overflow: hidden; }
.chapter-meter span { display: block; width: 0%; height: 100%; border-radius: inherit; background: var(--home-meter-fill); transition: width 0.6s ease; }
.chapter-progress-note { margin-top: 0.55rem; font-size: 0.82rem; color: var(--text-muted); line-height: 1.45; }
.chapter-links { display: grid; gap: 0.15rem; margin-top: 1.1rem; }
.chapter-links a { font-size: 0.82rem; font-weight: 700; color: var(--home-link-color); text-decoration: none; display: flex; align-items: center; justify-content: space-between; gap: 0.4rem; padding: 0.62rem 0; border-top: 1px solid var(--home-link-border); transition: color var(--transition), transform var(--transition); }
.chapter-links a:hover { color: var(--home-link-hover); transform: translateX(2px); }
.home-footer { text-align: center; padding: 2.5rem 0 0.5rem; color: var(--text-dim); font-size: 0.8rem; margin-top: auto; }
.home-footer a { color: var(--home-link-color); text-decoration: none; }
.home-footer a:hover { text-decoration: underline; }
#langToggleHome {
  position: fixed; top: 1rem; right: 1rem; z-index: 300;
  background: var(--home-lang-bg); border: 1px solid var(--home-lang-border);
  color: var(--home-lang-color); font-size: 0.85rem; font-weight: 700;
  padding: 0.55rem 1rem; border-radius: 999px; cursor: pointer;
  font-family: var(--font); transition: all var(--transition);
  box-shadow: var(--home-lang-shadow);
}
#langToggleHome:hover { background: var(--home-lang-hover); color: #fff; }

@media (max-width: 980px) {
  .home-header { grid-template-columns: 1fr; min-height: auto; }
  .home-header::after { width: min(40rem, 90%); height: 18rem; top: auto; bottom: -2rem; right: -6rem; }
  .home-visual { align-content: start; }
  .mission-grid { grid-template-columns: 1fr 1fr; }
  .mission-card:first-child { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .home-wrap { padding: 1rem 1rem 2.5rem; }
  .home-header { padding: 1.4rem; border-radius: 24px; }
  .hero-metric { min-width: 100%; }
  .mission-panel { padding: 1rem; border-radius: 24px; }
  .mission-panel-head, .home-section-head { align-items: start; flex-direction: column; }
  .mission-grid, .visual-metrics { grid-template-columns: 1fr; }
  .home-section-head { margin-top: 1.75rem; }
  .chapter-card { min-height: auto; border-radius: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== PRINT ===== */
@media print {
  body { background: #fff !important; color: #000 !important; }
  body::before, body::after { display: none !important; }
  .home-header::before, .home-header::after { display: none !important; }
  #langToggle, #langToggleHome, #chatToggleBtn, #chatPanel { display: none !important; }
  .mission-panel, .chapter-card {
    break-inside: avoid;
    page-break-inside: avoid;
    box-shadow: none !important;
    background: #fff !important;
  }
  a[href]:not([href^="#"])::after {
    content: " (" attr(href) ")";
    font-size: 9pt;
    color: #555;
  }
}