@import url('https://fonts.googleapis.com/css2?family=Sarabun:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&family=Fira+Code:wght@400;500&family=Playfair+Display:wght@700;800&display=swap');

:root {
  --navy:        #0f2744;
  --navy-mid:    #1a3a6c;
  --navy-light:  #2d5fa0;
  --orange:      #f97316;
  --orange-dark: #ea6c0a;
  --orange-glow: rgba(249,115,22,0.15);
  --green:       #059669;
  --green-light: #d1fae5;
  --blue:        #2563eb;
  --blue-light:  #dbeafe;
  --amber:       #d97706;
  --amber-light: #fef3c7;
  --red:         #dc2626;
  --bg:          #f5f7fa;
  --bg-white:    #ffffff;
  --text:        #1a202c;
  --text-mid:    #4a5568;
  --text-muted:  #718096;
  --border:      #e2e8f0;
  --border-dark: #cbd5e1;
  --sidebar-w:   272px;
  --radius:      10px;
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg:   0 8px 24px rgba(0,0,0,0.12);
  --font-th:     'Sarabun', 'TH Sarabun New', Tahoma, sans-serif;
  --font-display:'Playfair Display', 'Sarabun', Georgia, serif;
  --font-code:   'Fira Code', 'Cascadia Code', 'Courier New', monospace;
}

/* ─── Reset ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-th);
  font-size: 17px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  display: flex;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
ul, ol { padding-left: 1.5em; }

/* ─── Sidebar ────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--navy);
  position: fixed;
  inset: 0 auto 0 0;
  overflow-y: auto;
  z-index: 100;
  display: flex;
  flex-direction: column;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
  transition: transform 0.28s cubic-bezier(0.4,0,0.2,1);
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 2px; }

.sidebar-brand {
  padding: 22px 18px 18px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  display: block;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.sidebar-brand::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(249,115,22,0.06) 0%, transparent 60%);
  pointer-events: none;
}

.brand-code {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-code::before {
  content: '';
  display: block;
  width: 18px;
  height: 2px;
  background: var(--orange);
  border-radius: 1px;
}

.brand-th {
  font-size: 15px;
  font-weight: 700;
  color: #f1f5f9;
  line-height: 1.3;
  margin-bottom: 3px;
}

.brand-en {
  font-size: 11.5px;
  color: rgba(255,255,255,0.45);
  font-weight: 400;
}

.sidebar-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.3);
  padding: 16px 18px 6px;
}

.sidebar-nav {
  list-style: none;
  padding: 0 8px;
  flex: 1;
}

.sidebar-nav li a {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  padding: 8px 10px;
  border-radius: 7px;
  color: rgba(255,255,255,0.6);
  font-size: 13.5px;
  line-height: 1.35;
  transition: all 0.15s;
  margin-bottom: 1px;
  text-decoration: none;
}

.sidebar-nav li a:hover {
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.9);
}

.sidebar-nav li a.active {
  background: rgba(249,115,22,0.14);
  color: #fff;
}

.sidebar-nav li a.active .wk-num { background: var(--orange); color: #fff; }

.wk-num {
  min-width: 24px;
  height: 24px;
  background: rgba(255,255,255,0.08);
  border-radius: 5px;
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.4);
  flex-shrink: 0;
  margin-top: 1px;
  font-family: var(--font-code);
}

.wk-title { flex: 1; }

.lab-dot {
  width: 6px;
  height: 6px;
  background: var(--green);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 7px;
  box-shadow: 0 0 0 3px rgba(5,150,105,0.2);
}

.sidebar-home {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  transition: background 0.15s, color 0.15s;
}
.sidebar-home:hover { background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.9); }

/* ─── Hamburger ──────────────────────────────────────── */
.hamburger {
  display: none;
  position: fixed;
  top: 13px;
  left: 13px;
  z-index: 200;
  background: var(--navy);
  border: 1px solid rgba(255,255,255,0.12);
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4.5px;
  box-shadow: var(--shadow-md);
}

.hamburger span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: white;
  border-radius: 1px;
  transition: all 0.25s;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 99;
  backdrop-filter: blur(2px);
}

/* ─── Main Layout ────────────────────────────────────── */
.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ─── Breadcrumb ─────────────────────────────────────── */
.breadcrumb {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  padding: 9px 36px;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
}

.breadcrumb a { color: var(--blue); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { color: var(--border-dark); }

/* ─── INDEX HERO ─────────────────────────────────────── */
.index-hero {
  background: var(--navy);
  position: relative;
  padding: 64px 44px 56px;
  overflow: hidden;
}

.index-hero::before {
  content: '';
  position: absolute;
  top: -80px; right: -80px;
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(249,115,22,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.index-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(249,115,22,0.4), transparent);
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(249,115,22,0.12);
  border: 1px solid rgba(249,115,22,0.25);
  color: var(--orange);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-label::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--orange);
  border-radius: 50%;
  animation: pulse-orange 2s infinite;
}

@keyframes pulse-orange {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
  font-family: var(--font-th);
  font-size: 38px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 6px;
  position: relative;
}

.hero-title-en {
  font-size: 20px;
  font-weight: 400;
  color: rgba(255,255,255,0.5);
  margin-bottom: 28px;
  display: block;
  font-style: italic;
}

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-chip {
  display: flex;
  align-items: center;
  gap: 7px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.8);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13.5px;
}

.hero-chip .chip-icon { font-size: 15px; }
.hero-chip strong { color: white; }

/* ─── Content Area ───────────────────────────────────── */
.content {
  max-width: 860px;
  padding: 36px 44px 64px;
  flex: 1;
}

/* ─── Section Headers ────────────────────────────────── */
.sec-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
  margin-top: 8px;
}

.sec-head h2 {
  font-size: 19px;
  font-weight: 700;
  color: var(--navy);
  white-space: nowrap;
}

.sec-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border), transparent);
}

.sec-icon {
  width: 34px; height: 34px;
  background: var(--navy);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

/* ─── Info Cards (index) ─────────────────────────────── */
.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 36px;
}

.info-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
}

.info-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.info-card .ic-icon { font-size: 26px; margin-bottom: 8px; }
.info-card .ic-label { font-size: 11.5px; color: var(--text-muted); margin-bottom: 4px; }
.info-card .ic-value { font-size: 20px; font-weight: 700; color: var(--navy); line-height: 1.2; }
.info-card .ic-sub { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* ─── CLO Cards ──────────────────────────────────────── */
.clo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 12px;
}

.clo-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
  border-left: 3px solid var(--navy);
  transition: border-color 0.2s;
}

.clo-card:hover { border-left-color: var(--orange); }

.clo-badge {
  min-width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--navy), var(--navy-mid));
  color: white;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-family: var(--font-code);
}

.clo-text .clo-title { font-size: 14.5px; font-weight: 600; color: var(--text); line-height: 1.45; }
.clo-text .plo-pill {
  display: inline-block;
  background: var(--blue-light);
  color: var(--blue);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  margin-top: 6px;
}

/* ─── Schedule Table ─────────────────────────────────── */
.schedule-wrap {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-white);
  font-size: 14.5px;
}

.schedule-table thead th {
  background: var(--navy);
  color: rgba(255,255,255,0.85);
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.schedule-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.12s;
}

.schedule-table tbody tr:last-child { border-bottom: none; }
.schedule-table tbody tr:hover { background: #f8faff; }

.schedule-table td {
  padding: 11px 16px;
  vertical-align: middle;
}

.td-week {
  font-family: var(--font-code);
  font-size: 13px;
  font-weight: 700;
  color: var(--navy);
  width: 60px;
}

.td-topic a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}

.td-topic a:hover { color: var(--blue); text-decoration: underline; }

.td-clo { width: 140px; }

/* ─── Badges ─────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: 5px;
  font-size: 11.5px;
  font-weight: 700;
  white-space: nowrap;
}

.badge-lab   { background: var(--green-light);  color: var(--green); }
.badge-theory{ background: var(--blue-light);   color: var(--blue); }
.badge-proj  { background: #fef3c7;             color: var(--amber); }
.badge-exam  { background: #fce7f3;             color: #be185d; }
.badge-none  { background: #f1f5f9;             color: var(--text-muted); }

.clo-chip {
  display: inline-block;
  background: #f0f4ff;
  color: var(--navy-mid);
  font-size: 11px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 3px;
  margin: 1px;
  font-family: var(--font-code);
}

/* ─── Assessment ─────────────────────────────────────── */
.assessment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 12px;
}

.assess-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}

.assess-label { font-size: 13px; color: var(--text-muted); margin-bottom: 6px; }
.assess-pct   { font-size: 36px; font-weight: 800; color: var(--navy); line-height: 1; font-family: var(--font-code); }

.assess-bar-track {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-top: 10px;
  overflow: hidden;
}

.assess-bar-fill {
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--orange), var(--orange-dark));
}

/* ─── Instructor Card ────────────────────────────────── */
.instructor-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  gap: 22px;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
}

.instructor-ava {
  width: 72px; height: 72px;
  background: linear-gradient(135deg, var(--navy), var(--navy-light));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 26px;
  font-weight: 800;
  flex-shrink: 0;
  font-family: var(--font-display);
  box-shadow: 0 4px 12px rgba(15,39,68,0.3);
}

.instructor-name { font-size: 20px; font-weight: 700; color: var(--navy); margin-bottom: 3px; }
.instructor-role { font-size: 13px; color: var(--text-muted); margin-bottom: 14px; }

.instructor-rows { display: flex; flex-direction: column; gap: 7px; }

.instructor-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
}

.instructor-row .row-icon { font-size: 16px; flex-shrink: 0; }
.instructor-row a { color: var(--blue); }
.instructor-row a:hover { text-decoration: underline; }

/* ─── WEEK HERO ──────────────────────────────────────── */
.week-hero {
  background: var(--navy);
  padding: 36px 44px 32px;
  position: relative;
  overflow: hidden;
}

.week-hero::before {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(249,115,22,0.1) 0%, transparent 70%);
}

.week-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(249,115,22,0.35), transparent);
}

.wh-eyebrow {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.wh-eyebrow::before {
  content: '';
  display: block;
  width: 24px; height: 2px;
  background: var(--orange);
  border-radius: 1px;
}

.wh-title {
  font-size: 28px;
  font-weight: 800;
  color: white;
  line-height: 1.25;
  margin-bottom: 14px;
}

.wh-clos {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.wh-clo {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.85);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12.5px;
  font-weight: 600;
  font-family: var(--font-code);
}

/* ─── Section Badges ─────────────────────────────────── */
.sec-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
  text-transform: uppercase;
}

.sec-badge.theory  { background: var(--blue-light);  color: var(--blue); }
.sec-badge.code    { background: var(--amber-light); color: var(--amber); }
.sec-badge.lab     { background: var(--green-light); color: var(--green); }

/* ─── Theory Content ─────────────────────────────────── */
.theory-wrap { margin-bottom: 36px; }

.theory-wrap h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--navy);
  margin: 28px 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.theory-wrap h3::before {
  content: '';
  display: block;
  width: 3px;
  height: 20px;
  background: var(--orange);
  border-radius: 2px;
  flex-shrink: 0;
}

.theory-wrap p    { margin-bottom: 14px; color: var(--text); }
.theory-wrap ul   { margin-bottom: 14px; }
.theory-wrap ol   { margin-bottom: 14px; }
.theory-wrap li   { margin-bottom: 5px; }

.theory-wrap strong { color: var(--navy); }
.theory-wrap code {
  font-family: var(--font-code);
  font-size: 0.88em;
  background: #f0f4ff;
  color: var(--navy-mid);
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid #d8e4ff;
}

/* ─── Callout Boxes ──────────────────────────────────── */
.callout {
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin: 18px 0;
  font-size: 15px;
  border-left-width: 4px;
  border-left-style: solid;
}

.callout-title { font-size: 12px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 5px; }

.callout.note    { background: var(--blue-light);  border-color: var(--blue);  color: #1e3a8a; }
.callout.note .callout-title { color: var(--blue); }

.callout.tip     { background: var(--green-light); border-color: var(--green); color: #064e3b; }
.callout.tip .callout-title { color: var(--green); }

.callout.warning { background: #fff7ed;            border-color: var(--orange);color: #7c2d12; }
.callout.warning .callout-title { color: var(--orange); }

.callout.danger  { background: #fef2f2;            border-color: var(--red);   color: #7f1d1d; }
.callout.danger .callout-title { color: var(--red); }

/* ─── Diagram Box ────────────────────────────────────── */
.diagram-box {
  background: #f8faff;
  border: 1px solid #d8e4ff;
  border-radius: 10px;
  padding: 20px 24px;
  margin: 20px 0;
  overflow-x: auto;
}

.diagram-box pre {
  font-family: var(--font-code);
  font-size: 13px;
  color: var(--navy);
  white-space: pre;
  line-height: 1.6;
}

/* ─── Code Blocks ────────────────────────────────────── */
.code-block {
  margin: 20px 0;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(0,0,0,0.18);
}

.code-head {
  background: #1a1b26;
  display: flex;
  align-items: center;
  padding: 9px 16px;
  gap: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.code-dots {
  display: flex;
  gap: 5px;
  flex-shrink: 0;
}

.code-dots span {
  width: 10px; height: 10px;
  border-radius: 50%;
}

.code-dots .dot-r { background: #ff5f57; }
.code-dots .dot-y { background: #febc2e; }
.code-dots .dot-g { background: #28c840; }

.code-filename {
  flex: 1;
  font-family: var(--font-code);
  font-size: 12px;
  color: rgba(255,255,255,0.4);
}

.code-lang {
  font-family: var(--font-code);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: #cba6f7;
  background: rgba(203,166,247,0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

.copy-btn {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.45);
  padding: 4px 11px;
  border-radius: 5px;
  font-size: 11.5px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-th);
  flex-shrink: 0;
}

.copy-btn:hover { background: rgba(255,255,255,0.1); color: white; }
.copy-btn.copied { background: rgba(5,150,105,0.15); color: #6ee7b7; border-color: rgba(5,150,105,0.3); }

.code-block pre[class*="language-"] {
  margin: 0 !important;
  border-radius: 0 !important;
  background: #1e1e2e !important;
  max-height: 460px;
  overflow-y: auto;
  font-size: 13.5px !important;
  line-height: 1.65 !important;
}

.code-block pre::-webkit-scrollbar { height: 6px; width: 6px; }
.code-block pre::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }

/* ─── Lab Section ────────────────────────────────────── */
.lab-container { margin-top: 36px; }

.lab-header {
  background: linear-gradient(135deg, #065f46 0%, var(--green) 100%);
  color: white;
  padding: 22px 28px;
  border-radius: var(--radius) var(--radius) 0 0;
  position: relative;
  overflow: hidden;
}

.lab-header::before {
  content: '';
  position: absolute;
  right: -20px; top: -20px;
  width: 120px; height: 120px;
  background: rgba(255,255,255,0.05);
  border-radius: 50%;
}

.lab-header h2 {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 4px;
  position: relative;
}

.lab-header p {
  font-size: 13.5px;
  opacity: 0.8;
  position: relative;
}

.lab-body {
  background: #f0fdf6;
  border: 1px solid #a7f3d0;
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 24px;
}

.lab-task {
  background: white;
  border: 1px solid #d1fae5;
  border-radius: 9px;
  padding: 20px 22px;
  margin-bottom: 14px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}

.task-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 10px;
}

.task-num {
  min-width: 28px; height: 28px;
  background: var(--green);
  color: white;
  border-radius: 50%;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-family: var(--font-code);
}

.task-title { font-size: 16px; font-weight: 700; color: var(--text); line-height: 1.4; }

.task-body { margin-left: 40px; font-size: 15px; }
.task-body p  { margin-bottom: 8px; }
.task-body ul { margin-bottom: 10px; }
.task-body li { margin-bottom: 4px; }

.task-accept {
  background: #dcfce7;
  border: 1px solid #a7f3d0;
  border-radius: 7px;
  padding: 10px 14px;
  font-size: 13.5px;
  margin-top: 12px;
}

.task-accept .ta-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 4px;
}

.task-hint {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 7px;
  padding: 10px 14px;
  font-size: 13.5px;
  color: #78350f;
  margin-top: 8px;
}

.task-hint .th-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 4px;
}

/* ─── Week Nav ───────────────────────────────────────── */
.week-nav {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 14px;
  margin-top: 52px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.wn-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 14px 18px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--bg-white);
  color: var(--text);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
  max-width: 48%;
}

.wn-btn:hover {
  background: var(--navy);
  color: white;
  border-color: var(--navy);
  box-shadow: var(--shadow-md);
}

.wn-btn.wn-next { text-align: right; }

.wn-sub {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 3px;
}

.wn-btn:hover .wn-sub { color: rgba(255,255,255,0.55); }
.wn-name { font-size: 14.5px; font-weight: 600; }
.wn-btn.disabled { opacity: 0.35; pointer-events: none; }

/* ─── Table of Contents ──────────────────────────────── */
.toc-box {
  background: #f8faff;
  border: 1px solid #d8e4ff;
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 28px;
  font-size: 14.5px;
}

.toc-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list { list-style: none; padding: 0; }
.toc-list li { margin-bottom: 4px; }
.toc-list a { color: var(--navy-mid); font-size: 14px; }
.toc-list a:hover { color: var(--blue); text-decoration: underline; }

/* ─── Divider ────────────────────────────────────────── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 32px 0;
}

/* ─── Footer ─────────────────────────────────────────── */
footer {
  background: var(--navy);
  color: rgba(255,255,255,0.45);
  padding: 22px 44px;
  font-size: 13px;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.06);
}

footer a { color: rgba(255,255,255,0.6); }

/* ─── Responsive ─────────────────────────────────────── */
@media (max-width: 840px) {
  :root { --sidebar-w: 0px; }

  .sidebar {
    width: 272px;
    transform: translateX(-100%);
  }

  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; }
  .hamburger { display: flex; }

  .main { margin-left: 0; }

  .index-hero, .week-hero {
    padding: 68px 22px 32px;
  }

  .hero-title { font-size: 26px; }
  .wh-title   { font-size: 22px; }
  .content    { padding: 22px 22px 48px; }
  .breadcrumb { padding: 9px 22px; }

  .info-cards { grid-template-columns: 1fr 1fr; }
  .clo-grid   { grid-template-columns: 1fr; }

  .instructor-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .week-nav { flex-direction: column; }
  .wn-btn { max-width: 100%; }
  .wn-btn.wn-next { text-align: left; }

  .schedule-table { font-size: 13px; }
  .schedule-table td { padding: 9px 10px; }
}

/* ─── Print ──────────────────────────────────────────── */
@media print {
  .sidebar, .hamburger, .sidebar-overlay,
  .breadcrumb, .week-nav, .copy-btn, footer { display: none !important; }

  .main { margin-left: 0; }

  .week-hero {
    background: var(--navy) !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .lab-header {
    background: var(--green) !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  body { font-size: 13px; }
  .content { padding: 12px; max-width: 100%; }

  .code-block pre { max-height: none !important; white-space: pre-wrap; word-break: break-all; }
  .lab-task { page-break-inside: avoid; }
  .code-block { box-shadow: none; border: 1px solid #ccc; }
}