/* ════════════════════════════════════════════════
   eFile LMS — shared styles for course detail pages
   Design tokens and nav/footer match index.html.
   ════════════════════════════════════════════════ */

/* ── Reset & Base ─────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --blue-900: #0a1a25;
  --blue-800: #123144;
  --blue-700: #19405c;
  --blue-600: #2a4d6b;
  --blue-500: #2f5c7f;
  --blue-400: #61acdc;
  --blue-200: #c4e2f4;
  --blue-100: #e7f6ff;
  --blue-50:  #f0f8ff;
  --gray-900: #283339;
  --gray-600: #596066;
  --gray-400: #9aa0a6;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --white:    #ffffff;
  --yellow:   #facc15;
  --green:    #16a34a;
  --radius:   12px;
}
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--gray-900);
  line-height: 1.6;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ── Utility ──────────────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 880px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-label {
  text-transform: uppercase; font-size: 0.8rem; font-weight: 700;
  letter-spacing: 0.1em; color: #1a73a7; margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.25rem); font-weight: 800;
  line-height: 1.2; color: var(--blue-900); margin-bottom: 16px;
}
.section-subtitle {
  font-size: 1.05rem; color: var(--gray-600); max-width: 700px; line-height: 1.7;
}
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }
.alt-bg { background: var(--blue-50); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; border-radius: var(--radius);
  font-weight: 600; font-size: 1rem;
  transition: all 0.2s ease; cursor: pointer; border: 2px solid transparent;
}
.btn-primary { background: var(--blue-600); color: var(--white); border-color: var(--blue-600); }
.btn-primary:hover { background: var(--blue-800); border-color: var(--blue-800); transform: translateY(-1px); }
.btn-secondary { background: transparent; color: var(--blue-600); border-color: var(--blue-600); }
.btn-secondary:hover { background: var(--blue-600); color: var(--white); }
.btn-light {
  background: rgba(255,255,255,0.15); color: var(--white);
  border-color: rgba(255,255,255,0.3); backdrop-filter: blur(4px);
}
.btn-light:hover { background: rgba(255,255,255,0.25); }
.btn-white { background: var(--white); color: var(--blue-600); border-color: var(--white); }
.btn-white:hover { background: var(--blue-100); border-color: var(--blue-100); transform: translateY(-1px); }

/* ── Nav ───────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.85); backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--gray-200);
  transition: box-shadow 0.3s ease;
}
.nav.scrolled { box-shadow: 0 1px 12px rgba(0,0,0,0.08); }
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; max-width: 1200px; margin: 0 auto; padding: 0 24px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; }
.nav-logo img { height: 56px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { font-size: 0.925rem; font-weight: 500; color: var(--gray-600); transition: color 0.2s; }
.nav-links a:hover { color: var(--blue-600); }
.nav-cta { display: flex; align-items: center; gap: 12px; }
.nav-cta .btn { padding: 10px 20px; font-size: 0.9rem; }
.hamburger {
  display: none; background: none; border: none; cursor: pointer;
  width: 32px; height: 32px; position: relative;
}
.hamburger span {
  display: block; width: 22px; height: 2px; background: var(--gray-900);
  position: absolute; left: 5px; transition: all 0.3s ease;
}
.hamburger span:nth-child(1) { top: 9px; }
.hamburger span:nth-child(2) { top: 15px; }
.hamburger span:nth-child(3) { top: 21px; }

.mobile-menu {
  display: none; position: fixed; top: 72px; left: 0; right: 0; bottom: 0;
  background: var(--white); z-index: 99; padding: 24px;
  flex-direction: column; gap: 8px; overflow-y: auto;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  display: block; padding: 14px 0; font-size: 1.1rem; font-weight: 500;
  border-bottom: 1px solid var(--gray-200); color: var(--gray-900);
}
.mobile-menu .btn { margin-top: 12px; justify-content: center; }

/* ── Course Hero ───────────────────────────── */
.course-hero {
  position: relative; overflow: hidden; padding: 140px 0 72px;
  background: linear-gradient(135deg, var(--blue-900) 0%, var(--blue-700) 50%, var(--blue-600) 100%);
  color: var(--white);
}
.course-hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 75% 15%, rgba(97,172,220,0.25) 0%, transparent 60%),
              radial-gradient(ellipse at 25% 85%, rgba(196,226,244,0.1) 0%, transparent 50%);
}
.course-hero .container { position: relative; }
.breadcrumb {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-size: 0.875rem; color: rgba(231,246,255,0.7); margin-bottom: 24px;
}
.breadcrumb a { transition: color 0.2s; }
.breadcrumb a:hover { color: var(--blue-200); }
.breadcrumb span[aria-hidden] { opacity: 0.5; }
.breadcrumb .current { color: var(--white); font-weight: 500; }
.course-hero-tag {
  display: inline-block; background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2); border-radius: 100px;
  padding: 6px 16px; font-size: 0.8rem; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 20px;
}
.course-hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 3rem); font-weight: 800;
  line-height: 1.15; letter-spacing: -0.02em; margin-bottom: 20px; max-width: 900px;
}
.course-hero .lede {
  font-size: 1.15rem; color: rgba(231,246,255,0.85);
  max-width: 720px; line-height: 1.7; margin-bottom: 32px;
}
.course-meta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 36px; }
.course-meta-chip {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.15);
  border-radius: 100px; padding: 8px 18px; font-size: 0.9rem; font-weight: 500;
  backdrop-filter: blur(4px);
}
.course-meta-chip strong { font-weight: 700; }
.course-hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }

/* ── At a Glance ───────────────────────────── */
.glance-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 40px;
}
.glance-card {
  background: var(--white); border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 24px;
}
.glance-card h3 {
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: #1a73a7; font-weight: 700; margin-bottom: 10px;
}
.glance-card p { font-size: 0.95rem; color: var(--gray-600); line-height: 1.6; }
.glance-card strong { color: var(--gray-900); font-weight: 600; }

/* ── Requirement cards ─────────────────────── */
.req-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.req-card {
  background: var(--white); border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 28px; transition: all 0.2s ease;
}
.req-card:hover { border-color: var(--blue-200); box-shadow: 0 6px 20px rgba(10,26,37,0.07); }
.req-icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--blue-100); color: var(--blue-600);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.35rem; margin-bottom: 16px;
}
.req-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--blue-900); margin-bottom: 10px; }
.req-card p { font-size: 0.925rem; color: var(--gray-600); line-height: 1.65; }

/* ── Prose ─────────────────────────────────── */
.prose p { font-size: 1.02rem; color: var(--gray-600); line-height: 1.8; margin-bottom: 18px; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--gray-900); font-weight: 600; }
.prose a { color: var(--blue-600); font-weight: 500; text-decoration: underline; text-underline-offset: 2px; }
.prose a:hover { color: var(--blue-800); }
.prose h3 { font-size: 1.2rem; font-weight: 700; color: var(--blue-900); margin: 32px 0 12px; }
.prose ul.bullets { margin: 0 0 18px; }
.prose ul.bullets li {
  position: relative; padding-left: 26px; margin-bottom: 10px;
  font-size: 1rem; color: var(--gray-600); line-height: 1.7;
}
.prose ul.bullets li::before {
  content: '✓'; position: absolute; left: 0; top: 0;
  color: var(--green); font-weight: 700;
}

/* ── Callout ───────────────────────────────── */
.callout {
  background: var(--blue-50); border-left: 4px solid var(--blue-400);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 24px 28px; margin: 32px 0;
}
.callout h3 { font-size: 1rem; font-weight: 700; color: var(--blue-900); margin-bottom: 8px; }
.callout p { font-size: 0.95rem; color: var(--gray-600); line-height: 1.7; margin-bottom: 0; }
.callout.warn { background: #fffbeb; border-left-color: var(--yellow); }

/* ── Deadlines timeline ────────────────────── */
.timeline { margin-top: 40px; display: flex; flex-direction: column; gap: 0; }
.timeline-item {
  display: grid; grid-template-columns: 180px 1fr; gap: 28px;
  padding: 24px 0; border-top: 1px solid var(--gray-200);
}
.timeline-item:last-child { border-bottom: 1px solid var(--gray-200); }
.timeline-date { font-weight: 700; color: var(--blue-600); font-size: 0.95rem; }
.timeline-body h3 { font-size: 1.02rem; font-weight: 700; color: var(--blue-900); margin-bottom: 6px; }
.timeline-body p { font-size: 0.93rem; color: var(--gray-600); line-height: 1.65; }

/* ── Syllabus ──────────────────────────────── */
.syllabus { margin-top: 40px; display: flex; flex-direction: column; gap: 16px; }
.lesson {
  background: var(--white); border: 1px solid var(--gray-200);
  border-radius: var(--radius); overflow: hidden;
}
.lesson > summary {
  display: flex; align-items: center; gap: 16px; padding: 20px 24px;
  cursor: pointer; list-style: none; transition: background 0.2s ease;
}
.lesson > summary::-webkit-details-marker { display: none; }
.lesson > summary:hover { background: var(--blue-50); }
.lesson[open] > summary { background: var(--blue-50); border-bottom: 1px solid var(--gray-200); }
.lesson-num {
  flex-shrink: 0; width: 36px; height: 36px; border-radius: 50%;
  background: var(--blue-900); color: var(--white);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.9rem;
}
.lesson-heading { flex: 1; min-width: 0; }
.lesson-heading h3 { font-size: 1.02rem; font-weight: 700; color: var(--blue-900); line-height: 1.35; }
.lesson-heading .lesson-sub { font-size: 0.85rem; color: var(--gray-600); margin-top: 2px; }
.lesson-time {
  flex-shrink: 0; font-size: 0.85rem; font-weight: 600; color: var(--gray-600);
  background: var(--gray-100); border-radius: 100px; padding: 4px 14px;
}
.lesson-chevron { flex-shrink: 0; color: var(--gray-600); transition: transform 0.2s ease; }
.lesson[open] .lesson-chevron { transform: rotate(180deg); }
.lesson-body { padding: 20px 24px 24px 76px; }
.lesson-body li {
  position: relative; padding-left: 20px; margin-bottom: 9px;
  font-size: 0.93rem; color: var(--gray-600); line-height: 1.6;
}
.lesson-body li::before {
  content: ''; position: absolute; left: 0; top: 9px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--blue-400);
}
.lesson-body li:last-child { margin-bottom: 0; }
.lesson-body li.is-quiz { color: var(--blue-600); font-weight: 600; }
.lesson-body li.is-quiz::before { background: var(--green); }
.syllabus-note {
  margin-top: 24px; font-size: 0.9rem; color: var(--gray-600); text-align: center;
}
.syllabus-actions { margin-top: 24px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.syllabus-toggle {
  background: none; border: none; cursor: pointer; font: inherit;
  font-size: 0.9rem; font-weight: 600; color: var(--blue-600);
  padding: 8px 4px; text-decoration: underline; text-underline-offset: 3px;
}
.syllabus-toggle:hover { color: var(--blue-800); }

/* ── Stats strip ───────────────────────────── */
.stats-strip {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  background: var(--white); border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 32px; margin-top: 40px;
}
.stat { text-align: center; }
.stat-num { font-size: 2rem; font-weight: 800; color: var(--blue-600); line-height: 1.1; }
.stat-label { font-size: 0.85rem; color: var(--gray-600); margin-top: 6px; }

/* ── Other courses ─────────────────────────── */
.other-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 40px; }
.other-card {
  display: block; background: var(--white); border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 26px; transition: all 0.2s ease;
}
.other-card:hover { border-color: var(--blue-400); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(10,26,37,0.08); }
.other-tag {
  display: inline-block; background: var(--blue-100); color: var(--blue-600);
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase;
  border-radius: 100px; padding: 4px 12px; margin-bottom: 12px;
}
.other-card h3 { font-size: 1.02rem; font-weight: 700; color: var(--blue-900); margin-bottom: 8px; }
.other-card p { font-size: 0.9rem; color: var(--gray-600); line-height: 1.6; }
.other-card .more { display: inline-block; margin-top: 14px; font-size: 0.9rem; font-weight: 600; color: var(--blue-600); }

/* ── Sources ───────────────────────────────── */
.sources { margin-top: 40px; }
.sources h3 {
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--gray-600); font-weight: 700; margin-bottom: 14px;
}
.sources li { font-size: 0.88rem; color: var(--gray-600); margin-bottom: 8px; line-height: 1.6; }
.sources a { color: var(--blue-600); text-decoration: underline; text-underline-offset: 2px; }
.sources a:hover { color: var(--blue-800); }
.disclaimer {
  margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--gray-200);
  font-size: 0.85rem; color: var(--gray-600); line-height: 1.7;
}

/* ── CTA ───────────────────────────────────── */
.cta-section {
  background: linear-gradient(135deg, var(--blue-800) 0%, var(--blue-600) 100%);
  color: var(--white); padding: 88px 0; text-align: center;
}
.cta-section h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 800;
  margin-bottom: 16px; line-height: 1.2;
}
.cta-section p {
  font-size: 1.15rem; color: rgba(231,246,255,0.8);
  max-width: 560px; margin: 0 auto 36px; line-height: 1.7;
}
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ── Footer ────────────────────────────────── */
.footer { background: var(--blue-900); color: rgba(231,246,255,0.7); padding: 64px 0 32px; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; margin-top: 16px; max-width: 300px; }
.footer-brand img { height: 32px; }
.footer h3 {
  font-weight: 700; font-size: 0.85rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--white); margin-bottom: 16px;
}
.footer ul { display: flex; flex-direction: column; gap: 10px; }
.footer ul a { font-size: 0.9rem; transition: color 0.2s; }
.footer ul a:hover { color: var(--blue-200); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px; display: flex; justify-content: space-between;
  align-items: center; font-size: 0.85rem; flex-wrap: wrap; gap: 16px;
}
.footer-bottom a { transition: color 0.2s; }
.footer-bottom a:hover { color: var(--blue-200); }
.footer-legal { display: flex; gap: 24px; }

/* ── Responsive ────────────────────────────── */
@media (max-width: 1024px) {
  .glance-grid { grid-template-columns: repeat(2, 1fr); }
  .req-grid { grid-template-columns: repeat(2, 1fr); }
  .other-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: block; }
  .course-hero { padding: 112px 0 56px; }
  .glance-grid { grid-template-columns: 1fr; }
  .req-grid { grid-template-columns: 1fr; }
  .other-grid { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: 1fr 1fr; row-gap: 28px; }
  .timeline-item { grid-template-columns: 1fr; gap: 8px; }
  .lesson-body { padding-left: 24px; }
  .lesson-time { font-size: 0.8rem; padding: 3px 10px; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .section { padding: 56px 0; }
}
@media (max-width: 480px) {
  .stats-strip { grid-template-columns: 1fr; }
  .course-hero-buttons { flex-direction: column; align-items: stretch; }
  .course-hero-buttons .btn { justify-content: center; }
}

/* ── Accessibility ─────────────────────────── */
.skip-link {
  position: absolute; top: -100%; left: 16px; z-index: 200;
  background: var(--blue-600); color: var(--white); padding: 12px 24px;
  border-radius: var(--radius); font-weight: 600; font-size: 0.95rem;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }
*:focus-visible { outline: 3px solid var(--blue-600); outline-offset: 2px; }
.btn:focus-visible {
  outline: 3px solid var(--blue-600); outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(42,77,107,0.25);
}
/* On the dark hero, CTA, and footer, blue-600 would not contrast; invert it.
   .btn is listed explicitly so this outranks .btn:focus-visible above. */
.course-hero *:focus-visible,
.cta-section *:focus-visible,
.footer *:focus-visible,
.course-hero .btn:focus-visible,
.cta-section .btn:focus-visible,
.footer .btn:focus-visible {
  outline-color: var(--blue-200);
  box-shadow: none;
}
.nav-logo:focus-visible { border-radius: 8px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}