/* ============================================================
   FinTech Learning Academy — Style System
   Design: Amber · Outfit · Inter · JetBrains Mono
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── RESET ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 15px; scroll-behavior: smooth; }

/* ── DESIGN TOKENS ── */
:root {
  --bg:           #f6f8fa;
  --bg-card:      #ffffff;
  --bg-hover:     #f0f2f4;
  --bg-tag:       #eaeef2;
  --border:       #d0d7de;
  --border-dark:  #b0b8c2;
  --text:         #1f2328;
  --text-2:       #424a53;
  --text-3:       #636c76;
  --text-4:       #9198a1;

  --amber:        #d97706;
  --amber-hover:  #b45309;
  --amber-light:  #fef3c7;
  --amber-border: #fde68a;
  --amber-bg:     #fffbeb;

  --teal:         #0d9488;
  --teal-bg:      #f0fdfa;
  --teal-border:  #99f6e4;

  --indigo:       #4c6ef5;
  --indigo-bg:    #edf2ff;
  --indigo-border:#c5d0fd;

  --purple:       #7c3aed;
  --purple-bg:    #f5f3ff;
  --purple-border:#ddd6fe;

  --green:        #1a7f37;
  --green-bg:     #dafbe1;
  --green-border: #99e6b0;

  --red:          #cf222e;
  --red-bg:       #ffebe9;
  --red-border:   #ffcecb;

  --code-bg:      #0f172a;
  --code-text:    #e2e8f0;

  --nav-h:        64px;
  --wide-w:       1120px;
  --content-w:    800px;
  --radius:       8px;
  --radius-lg:    12px;
  --shadow:       0 1px 3px rgba(31,35,40,0.08), 0 4px 12px rgba(31,35,40,0.04);
  --shadow-lg:    0 4px 16px rgba(31,35,40,0.12);

  --font-display: 'Outfit', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Cascadia Code', monospace;
}

body { font-family: var(--font-body); background: var(--bg); color: var(--text); line-height: 1.7; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-dark); border-radius: 10px; }

/* ── NAV ── */
.nav {
  position: sticky; top: 0; z-index: 100; height: var(--nav-h);
  background: rgba(246,248,250,0.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
}
.nav-inner {
  max-width: var(--wide-w); margin: 0 auto; padding: 0 2rem; width: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: 2rem;
}
.nav-brand {
  font-family: var(--font-display); font-size: 1rem; font-weight: 800;
  color: var(--text); text-decoration: none; letter-spacing: -0.01em;
}
.nav-brand span { color: var(--amber); }
.nav-links { display: flex; align-items: center; gap: 0.25rem; }
.nav-link {
  color: var(--text-3); text-decoration: none; font-size: 0.875rem; font-weight: 500;
  padding: 6px 12px; border-radius: var(--radius); transition: background 0.15s, color 0.15s;
}
.nav-link:hover, .nav-link.active { background: var(--bg-hover); color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 0.5rem; }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-body); font-size: 0.875rem; font-weight: 600;
  padding: 9px 20px; border-radius: var(--radius); text-decoration: none;
  transition: all 0.15s; cursor: pointer; border: none; white-space: nowrap;
}
.btn-primary { background: var(--amber); color: #fff; border: 1px solid var(--amber); }
.btn-primary:hover { background: var(--amber-hover); border-color: var(--amber-hover); }
.btn-outline { background: transparent; color: var(--text-2); border: 1px solid var(--border); }
.btn-outline:hover { background: var(--bg-hover); color: var(--text); border-color: var(--border-dark); }
.btn-teal { background: var(--teal); color: #fff; border: 1px solid var(--teal); }
.btn-teal:hover { background: #0f766e; border-color: #0f766e; }
.btn-indigo { background: var(--indigo); color: #fff; border: 1px solid var(--indigo); }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }

/* ── BADGES ── */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 500; line-height: 1;
  padding: 3px 8px; border-radius: 20px; white-space: nowrap;
}
.badge-amber   { background: var(--amber-bg);   color: var(--amber);   border: 1px solid var(--amber-border); }
.badge-teal    { background: var(--teal-bg);     color: var(--teal);    border: 1px solid var(--teal-border); }
.badge-indigo  { background: var(--indigo-bg);   color: var(--indigo);  border: 1px solid var(--indigo-border); }
.badge-purple  { background: var(--purple-bg);   color: var(--purple);  border: 1px solid var(--purple-border); }
.badge-green   { background: var(--green-bg);    color: var(--green);   border: 1px solid var(--green-border); }
.badge-red     { background: var(--red-bg);      color: var(--red);     border: 1px solid var(--red-border); }
.badge-gray    { background: var(--bg-tag);      color: var(--text-2);  border: 1px solid var(--border); }

/* ── LAYOUT ── */
.container { max-width: var(--wide-w); margin: 0 auto; padding: 0 2rem; }
.container-narrow { max-width: var(--content-w); margin: 0 auto; padding: 0 2rem; }
.section { padding: 4rem 0; }
.section-label {
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--amber);
  margin-bottom: 0.5rem;
}
.section-title {
  font-family: var(--font-display); font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800; color: var(--text); line-height: 1.15;
  letter-spacing: -0.02em; margin-bottom: 1rem;
}
.section-sub { color: var(--text-3); font-size: 0.95rem; line-height: 1.75; max-width: 540px; }

/* ── HERO ── */
.hero {
  padding: 5rem 0 3.5rem;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-card) 100%);
  border-bottom: 1px solid var(--border);
}
.hero-inner {
  max-width: var(--wide-w); margin: 0 auto; padding: 0 2rem;
  display: grid; grid-template-columns: 1fr 380px; gap: 4rem; align-items: center;
}
.hero-eyebrow {
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--amber);
  margin-bottom: 1rem;
}
.hero h1 {
  font-family: var(--font-display); font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800; color: var(--text); line-height: 1.1;
  letter-spacing: -0.025em; margin-bottom: 1rem;
}
.hero-sub { color: var(--text-2); font-size: 1rem; line-height: 1.85; margin-bottom: 2rem; max-width: 500px; }
.hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* ── STATS STRIP ── */
.stats-strip {
  background: var(--bg-card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.stats-grid {
  max-width: var(--wide-w); margin: 0 auto; padding: 1.5rem 2rem;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem;
}
.stat-item { text-align: center; }
.stat-number {
  font-family: var(--font-display); font-size: 1.75rem; font-weight: 800;
  color: var(--amber); display: block; line-height: 1;
}
.stat-label { font-size: 0.8rem; color: var(--text-3); margin-top: 0.25rem; }

/* ── COURSE CARDS GRID ── */
.course-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem;
  margin-top: 2rem;
}
.course-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s; text-decoration: none;
  display: flex; flex-direction: column;
}
.course-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.course-header {
  height: 8px;
}
.course-header-amber  { background: linear-gradient(90deg, var(--amber), #f59e0b); }
.course-header-teal   { background: linear-gradient(90deg, var(--teal), #14b8a6); }
.course-header-indigo { background: linear-gradient(90deg, var(--indigo), #818cf8); }
.course-header-purple { background: linear-gradient(90deg, var(--purple), #a855f7); }
.course-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
.course-meta { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.75rem; flex-wrap: wrap; }
.course-title {
  font-family: var(--font-display); font-size: 1.15rem; font-weight: 700;
  color: var(--text); margin-bottom: 0.5rem; line-height: 1.25;
}
.course-desc { font-size: 0.88rem; color: var(--text-3); line-height: 1.7; flex: 1; margin-bottom: 1rem; }
.course-stats {
  display: flex; gap: 1.25rem; margin-bottom: 1rem;
  font-size: 0.78rem; color: var(--text-3);
}
.course-stats span { display: flex; align-items: center; gap: 0.3rem; }
.skills-list { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 1.25rem; }
.skill-chip {
  font-family: var(--font-mono); font-size: 0.68rem; padding: 3px 8px;
  background: var(--bg-tag); border: 1px solid var(--border); border-radius: 4px;
  color: var(--text-2);
}
.progress-bar-wrap { margin-bottom: 1.25rem; }
.progress-label { font-size: 0.75rem; color: var(--text-4); margin-bottom: 0.35rem; display: flex; justify-content: space-between; }
.progress-bar { height: 4px; background: var(--bg-tag); border-radius: 2px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--amber); border-radius: 2px; transition: width 0.5s ease; }

/* ── MODULE ACCORDION ── */
.module-list { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 1.5rem; }
.module-item {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
}
.module-header {
  display: flex; align-items: center; gap: 1rem; padding: 1rem 1.25rem;
  cursor: pointer; transition: background 0.15s; user-select: none;
}
.module-header:hover { background: var(--bg-hover); }
.module-number {
  width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: 0.78rem; font-weight: 700; flex-shrink: 0;
  background: var(--amber-bg); color: var(--amber); border: 1px solid var(--amber-border);
}
.module-title-wrap { flex: 1; }
.module-title { font-weight: 600; color: var(--text); font-size: 0.92rem; }
.module-subtitle { font-size: 0.78rem; color: var(--text-3); margin-top: 0.1rem; }
.module-chevron { color: var(--text-3); font-size: 0.8rem; transition: transform 0.2s; }
.module-item.open .module-chevron { transform: rotate(90deg); }
.module-lessons { padding: 0 1.25rem 1rem 3.5rem; display: none; }
.module-item.open .module-lessons { display: block; }
.lesson-link {
  display: flex; align-items: center; gap: 0.75rem; padding: 0.6rem 0;
  border-bottom: 1px solid var(--border); text-decoration: none; color: var(--text-2);
  font-size: 0.875rem; transition: color 0.15s;
}
.lesson-link:last-child { border-bottom: none; }
.lesson-link:hover { color: var(--amber); }
.lesson-icon { width: 18px; height: 18px; background: var(--bg-tag); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.6rem; flex-shrink: 0; }
.lesson-duration { margin-left: auto; font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-4); }

/* ── LESSON CONTENT ── */
.lesson-layout {
  display: grid; grid-template-columns: 1fr 260px; gap: 3rem;
  max-width: var(--wide-w); margin: 0 auto; padding: 3rem 2rem;
}
.lesson-article {}
.lesson-article h2 {
  font-family: var(--font-display); font-size: 1.35rem; font-weight: 800;
  color: var(--text); margin: 2rem 0 0.75rem; letter-spacing: -0.015em;
}
.lesson-article h3 {
  font-family: var(--font-display); font-size: 1.05rem; font-weight: 700;
  color: var(--text); margin: 1.5rem 0 0.5rem;
}
.lesson-article p { color: var(--text-2); font-size: 0.95rem; line-height: 1.85; margin-bottom: 1.1rem; }
.lesson-article ul, .lesson-article ol { color: var(--text-2); padding-left: 1.5rem; margin-bottom: 1rem; }
.lesson-article li { font-size: 0.93rem; line-height: 1.75; margin-bottom: 0.35rem; }
.lesson-article strong { color: var(--text); font-weight: 600; }
.lesson-article code {
  font-family: var(--font-mono); font-size: 0.85em; background: var(--bg-tag);
  border: 1px solid var(--border); padding: 1px 6px; border-radius: 4px; color: var(--indigo);
}

.callout {
  border-radius: var(--radius); padding: 1rem 1.25rem; margin: 1.5rem 0;
  border-left: 3px solid;
}
.callout-note { background: var(--amber-bg); border-color: var(--amber); }
.callout-note .callout-title { color: var(--amber); }
.callout-tip { background: var(--teal-bg); border-color: var(--teal); }
.callout-tip .callout-title { color: var(--teal); }
.callout-warning { background: var(--red-bg); border-color: var(--red); }
.callout-warning .callout-title { color: var(--red); }
.callout-title { font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.35rem; }
.callout p { font-size: 0.875rem; line-height: 1.7; color: var(--text-2); margin: 0; }

.code-block {
  background: var(--code-bg); color: var(--code-text); border-radius: var(--radius);
  padding: 1.25rem 1.5rem; margin: 1rem 0;
  font-family: var(--font-mono); font-size: 0.8rem; line-height: 1.8;
  overflow-x: auto; white-space: pre;
}
.code-block .kw  { color: #c792ea; }
.code-block .str { color: #c3e88d; }
.code-block .num { color: #f78c6c; }
.code-block .cmt { color: #546e7a; }
.code-block .key { color: #82aaff; }

/* ── LESSON SIDEBAR ── */
.lesson-sidebar {}
.sidebar-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 1.25rem; margin-bottom: 1.25rem;
}
.sidebar-card-title {
  font-family: var(--font-display); font-size: 0.85rem; font-weight: 700;
  color: var(--text); margin-bottom: 0.75rem;
}
.sidebar-toc a {
  display: flex; padding: 0.4rem 0; font-size: 0.8rem; color: var(--text-3);
  text-decoration: none; border-bottom: 1px solid var(--border); transition: color 0.15s;
}
.sidebar-toc a:last-child { border-bottom: none; }
.sidebar-toc a:hover { color: var(--amber); }

/* ── QUIZ ── */
.quiz-container { max-width: 680px; margin: 0 auto; }
.quiz-question { margin-bottom: 2rem; }
.quiz-q-text { font-weight: 600; font-size: 0.95rem; color: var(--text); margin-bottom: 0.75rem; }
.quiz-options { display: flex; flex-direction: column; gap: 0.5rem; }
.quiz-option {
  padding: 0.75rem 1rem; border: 1px solid var(--border); border-radius: var(--radius);
  cursor: pointer; font-size: 0.875rem; color: var(--text-2);
  transition: all 0.15s; background: var(--bg-card);
}
.quiz-option:hover { border-color: var(--amber); background: var(--amber-bg); color: var(--text); }
.quiz-option.correct { border-color: var(--teal); background: var(--teal-bg); color: var(--teal); }
.quiz-option.incorrect { border-color: var(--red); background: var(--red-bg); color: var(--red); }
.quiz-result { text-align: center; padding: 2rem; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--bg-card); }
.quiz-score { font-family: var(--font-display); font-size: 3rem; font-weight: 800; color: var(--amber); }

/* ── BREADCRUMB ── */
.breadcrumb {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.8rem; color: var(--text-3); padding: 1rem 0; flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-3); text-decoration: none; }
.breadcrumb a:hover { color: var(--amber); }
.breadcrumb-sep { color: var(--text-4); }

/* ── CERTIFICATE ── */
.certificate-wrap {
  max-width: 720px; margin: 3rem auto; padding: 0 2rem;
}
.certificate-frame {
  background: var(--bg-card); border: 2px solid var(--amber-border); border-radius: 16px;
  padding: 3rem; text-align: center; position: relative;
  box-shadow: 0 0 0 6px var(--amber-bg), 0 0 0 8px var(--amber-border);
}
.certificate-header { font-family: var(--font-display); font-size: 0.8rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-3); margin-bottom: 1rem; }
.certificate-title { font-family: var(--font-display); font-size: 2.5rem; font-weight: 800; color: var(--text); letter-spacing: -0.02em; margin-bottom: 0.5rem; }
.certificate-sub { font-size: 0.95rem; color: var(--text-3); margin-bottom: 2rem; }
.certificate-name { font-family: var(--font-display); font-size: 2rem; font-weight: 700; color: var(--amber); border-bottom: 2px solid var(--amber-border); padding-bottom: 0.5rem; display: inline-block; min-width: 280px; margin-bottom: 0.5rem; }
.certificate-course { font-size: 1rem; color: var(--text-2); margin-bottom: 2rem; }
.certificate-seal { font-size: 3rem; margin: 1rem 0; }
.certificate-footer { display: flex; justify-content: space-around; margin-top: 2rem; }
.certificate-sig { text-align: center; }
.certificate-sig-line { width: 140px; height: 1px; background: var(--border-dark); margin: 0 auto 0.35rem; }
.certificate-sig-name { font-size: 0.78rem; color: var(--text-3); }

/* ── TAKEAWAYS BOX ── */
.takeaways {
  background: var(--bg-card); border: 1px solid var(--border); border-left: 4px solid var(--amber);
  border-radius: var(--radius); padding: 1.25rem 1.5rem; margin: 2rem 0;
}
.takeaways-title { font-family: var(--font-display); font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 0.75rem; }
.takeaways ul { list-style: none; padding: 0; }
.takeaways li { font-size: 0.875rem; color: var(--text-2); padding: 0.3rem 0; padding-left: 1.25rem; position: relative; }
.takeaways li::before { content: '✓'; position: absolute; left: 0; color: var(--amber); font-weight: 700; }

/* ── LESSON NAV ── */
.lesson-nav { display: flex; justify-content: space-between; padding: 2rem 0; border-top: 1px solid var(--border); margin-top: 2rem; }
.lesson-nav a { display: flex; align-items: center; gap: 0.5rem; text-decoration: none; font-size: 0.875rem; font-weight: 600; color: var(--text-3); padding: 8px 16px; border: 1px solid var(--border); border-radius: var(--radius); transition: all 0.15s; }
.lesson-nav a:hover { background: var(--amber-bg); border-color: var(--amber); color: var(--amber); }

/* ── FOOTER ── */
.footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 3rem 0 1.5rem; margin-top: 4rem; }
.footer-grid { max-width: var(--wide-w); margin: 0 auto; padding: 0 2rem; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 3rem; }
.footer-brand { font-family: var(--font-display); font-size: 1rem; font-weight: 800; color: var(--text); margin-bottom: 0.5rem; }
.footer-brand span { color: var(--amber); }
.footer-desc { font-size: 0.8rem; color: var(--text-3); line-height: 1.7; }
.footer-col-title { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text); margin-bottom: 0.75rem; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 0.4rem; }
.footer-links a { font-size: 0.82rem; color: var(--text-3); text-decoration: none; }
.footer-links a:hover { color: var(--amber); }
.footer-bottom { max-width: var(--wide-w); margin: 2rem auto 0; padding: 1rem 2rem 0; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
.footer-copyright { font-size: 0.78rem; color: var(--text-4); }

/* ── DIVIDER ── */
.divider-line { border: none; border-top: 1px solid var(--border); margin: 0; }

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .course-grid { grid-template-columns: 1fr; }
  .hero-inner { grid-template-columns: 1fr; }
  .lesson-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}

/* ═══════════════════════════════════════════════
   DARK THEME
   ═══════════════════════════════════════════════ */
[data-theme="dark"] {
  --bg:          #0f172a;
  --bg-card:     #1e293b;
  --bg-hover:    #334155;
  --bg-tag:      #1e293b;
  --border:      #334155;
  --border-dark: #475569;
  --text:        #f1f5f9;
  --text-2:      #cbd5e1;
  --text-3:      #94a3b8;
  --text-4:      #64748b;
  --code-bg:     #0f172a;
  --code-text:   #e2e8f0;
}
[data-theme="dark"] .nav { background: rgba(15,23,42,0.95); border-bottom-color: var(--border); }
[data-theme="dark"] body { background: var(--bg); color: var(--text); }

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-3);
  cursor: pointer;
  border-radius: 6px;
  padding: 0.3rem 0.65rem;
  font-size: 0.85rem;
  line-height: 1;
  margin-left: 0.5rem;
  transition: background 0.15s, color 0.15s;
}
.theme-toggle:hover { background: var(--bg-hover); color: var(--text); }