/* ================================================================
   csspastpapers.com — Design System
   Version 2.0 | Professional CSS Preparation Platform
   
   Table of Contents:
   1. CSS Variables (Design Tokens)
   2. Dark Mode Tokens
   3. Reset & Base
   4. Typography
   5. Layout Utilities
   6. Navigation
   7. Buttons
   8. Cards
   9. Forms
   10. Badges & Pills
   11. Page Heroes
   12. Stats
   13. Alerts
   14. Progress Components
   15. Footer
   16. Animations
   17. Utility Classes
   18. Responsive
   ================================================================ */

/* ================================================================
   1. DESIGN TOKENS
   ================================================================ */
:root {
  /* Brand Colors */
  --navy:       #1a3557;
  --navy-dk:    #0f2238;
  --navy-lt:    #e8f0fa;
  --sky:        #3b82f6;
  --sky-dk:     #2563eb;
  --sky-lt:     #dbeafe;
  --gold:       #c8893a;
  --gold-dk:    #a0692a;
  --gold-lt:    #fef3e2;
  --teal:       #0891b2;
  --teal-lt:    #e0f7fa;
  --green:      #16a34a;
  --green-lt:   #dcfce7;
  --red:        #dc2626;
  --red-lt:     #fee2e2;
  --purple:     #7c3aed;
  --purple-lt:  #ede9fe;

  /* Neutrals */
  --white:      #ffffff;
  --gray-50:    #f8fafc;
  --gray-100:   #f1f5f9;
  --gray-200:   #e2e8f0;
  --gray-300:   #cbd5e1;
  --gray-400:   #94a3b8;
  --gray-500:   #64748b;
  --gray-600:   #475569;
  --gray-700:   #334155;
  --gray-800:   #1e293b;
  --gray-900:   #0f172a;

  /* Typography */
  --font-sans:  -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-mono:  'Courier New', Courier, monospace;

  /* Spacing scale */
  --sp-1:  4px;
  --sp-2:  8px;
  --sp-3:  12px;
  --sp-4:  16px;
  --sp-5:  20px;
  --sp-6:  24px;
  --sp-8:  32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --sp-20: 80px;

  /* Border Radius */
  --r-sm:  6px;
  --r-md:  10px;
  --r-lg:  16px;
  --r-xl:  24px;
  --r-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-sm: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.04);
  --shadow-md: 0 10px 20px -3px rgba(0,0,0,.09), 0 4px 8px rgba(0,0,0,.04);
  --shadow-lg: 0 20px 30px -5px rgba(0,0,0,.11), 0 8px 16px rgba(0,0,0,.04);
  --shadow-xl: 0 25px 50px -12px rgba(0,0,0,.2);

  /* Layout */
  --nav-h:     68px;
  --max-w:     1200px;
  --content-w: 740px;

  /* Transitions */
  --t-fast:   .15s ease;
  --t-base:   .2s ease;
  --t-slow:   .35s ease;
}

/* ================================================================
   2. DARK MODE
   ================================================================ */
[data-theme="dark"] {
  --white:      #0f172a;
  --gray-50:    #1e293b;
  --gray-100:   #1e293b;
  --gray-200:   #334155;
  --gray-300:   #475569;
  --gray-400:   #64748b;
  --gray-500:   #94a3b8;
  --gray-600:   #cbd5e1;
  --gray-700:   #e2e8f0;
  --gray-800:   #f1f5f9;
  --navy-lt:    #1a2d45;
  --sky-lt:     #1e3a5f;
  --gold-lt:    #2a1f0e;
  --green-lt:   #052e16;
  --red-lt:     #450a0a;
  --purple-lt:  #2e1065;
  --teal-lt:    #0a2535;
}

/* ================================================================
   3. RESET & BASE
   ================================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}
body {
  font-family: var(--font-sans);
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background .25s ease, color .25s ease;
}
img { max-width: 100%; display: block; }
a {
  color: var(--sky);
  text-decoration: none;
  transition: color var(--t-base);
}
a:hover { color: var(--sky-dk); }
ul, ol { list-style: none; }
button { font-family: var(--font-sans); }
main { flex: 1; padding-top: var(--nav-h); }

/* ================================================================
   4. TYPOGRAPHY
   ================================================================ */
h1, h2, h3, h4, h5 {
  font-family: var(--font-serif);
  line-height: 1.25;
  color: var(--navy);
  margin-bottom: .45em;
}
[data-theme="dark"] h1,
[data-theme="dark"] h2,
[data-theme="dark"] h3,
[data-theme="dark"] h4 { color: var(--gray-700); }

h1 { font-size: clamp(1.75rem, 4.5vw, 2.75rem); }
h2 { font-size: clamp(1.3rem,  3vw,   1.85rem); }
h3 { font-size: clamp(1.05rem, 2vw,   1.25rem); }
h4 { font-size: 1rem; }
h5 { font-size: .9rem; font-family: var(--font-sans); font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--gray-500); }

p { color: var(--gray-600); margin-bottom: .8rem; }
p:last-child { margin-bottom: 0; }

/* Article / Prose typography */
.prose p          { margin-bottom: 1.1rem; line-height: 1.85; }
.prose h2         { margin: 2rem 0 .75rem; padding-bottom: .5rem; border-bottom: 1px solid var(--gray-200); }
.prose h3         { margin: 1.5rem 0 .5rem; }
.prose ul,
.prose ol         { margin: .75rem 0 1.25rem 1.25rem; list-style: revert; }
.prose li         { margin-bottom: .4rem; color: var(--gray-600); line-height: 1.7; }
.prose blockquote {
  border-left: 4px solid var(--gold);
  margin: 1.5rem 0;
  padding: .8rem 1.25rem;
  background: var(--gold-lt);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  font-style: italic;
  color: var(--gray-700);
}
.prose strong { color: var(--navy); }
[data-theme="dark"] .prose strong { color: var(--gray-700); }
.prose code {
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  padding: 2px 6px;
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: .88em;
  color: var(--red);
}
.prose a { color: var(--sky); font-weight: 500; text-decoration: underline; }

/* ================================================================
   5. LAYOUT UTILITIES
   ================================================================ */
.container    { max-width: var(--max-w);     margin: 0 auto; padding: 0 var(--sp-6); }
.container-sm { max-width: var(--content-w); margin: 0 auto; padding: 0 var(--sp-6); }
.container-md { max-width: 960px;            margin: 0 auto; padding: 0 var(--sp-6); }

.section    { padding: var(--sp-16) 0; }
.section-sm { padding: var(--sp-10) 0; }
.section-lg { padding: var(--sp-20) 0; }
.section-alt { background: var(--white); }

/* Grid helpers */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-6); }

/* Flex helpers */
.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-wrap    { flex-wrap: wrap; }
.gap-2        { gap: var(--sp-2); }
.gap-3        { gap: var(--sp-3); }
.gap-4        { gap: var(--sp-4); }
.gap-6        { gap: var(--sp-6); }

/* ================================================================
   6. NAVIGATION
   ================================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--navy-dk);
  z-index: 9000;
  box-shadow: 0 2px 16px rgba(0,0,0,.25);
  transition: box-shadow var(--t-base);
}
.navbar.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,.3); }

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--sp-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}

/* Brand */
.nav-brand { display: flex; flex-direction: column; line-height: 1.1; flex-shrink: 0; text-decoration: none; }
.nav-brand:hover { text-decoration: none; }
.brand-name { font-family: var(--font-serif); font-size: 1.05rem; font-weight: 700; color: #fff; }
.brand-tag  { font-size: .65rem; color: rgba(255,255,255,.45); text-transform: uppercase; letter-spacing: .1em; }

/* Desktop links */
.nav-links { display: flex; align-items: center; gap: 2px; margin: 0; padding: 0; }
.nav-links li { position: relative; }

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 7px 12px;
  font-size: .84rem;
  font-weight: 600;
  color: rgba(255,255,255,.78);
  border-radius: var(--r-md);
  transition: all var(--t-base);
  text-decoration: none;
  white-space: nowrap;
}
.nav-link:hover  { background: rgba(255,255,255,.1); color: #fff; text-decoration: none; }
.nav-link.active { background: rgba(59,130,246,.35); color: #fff; }
.nav-link .nav-arrow { font-size: .6rem; opacity: .7; }

/* Dropdown */
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 200px;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  z-index: 9100;
}
[data-theme="dark"] .nav-dropdown-menu { background: #1e293b; border-color: #334155; }
.nav-links li:hover .nav-dropdown-menu,
.nav-links li:focus-within .nav-dropdown-menu { display: block; animation: dropIn .15s ease; }
@keyframes dropIn { from { opacity:0; transform:translateY(-6px); } to { opacity:1; transform:translateY(0); } }
.nav-dropdown-menu a {
  display: block;
  padding: 10px 16px;
  font-size: .86rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: background var(--t-fast);
  text-decoration: none;
  border-bottom: 1px solid var(--gray-100);
}
[data-theme="dark"] .nav-dropdown-menu a { color: var(--gray-600); border-color: #334155; }
.nav-dropdown-menu a:last-child { border-bottom: none; }
.nav-dropdown-menu a:hover { background: var(--sky-lt); color: var(--sky-dk); text-decoration: none; }

/* Nav right controls */
.nav-controls { display: flex; align-items: center; gap: var(--sp-2); flex-shrink: 0; }

.nav-cta {
  padding: 7px 16px;
  background: var(--sky);
  color: #fff;
  border-radius: var(--r-full);
  font-size: .82rem;
  font-weight: 700;
  transition: all var(--t-base);
  text-decoration: none;
  white-space: nowrap;
}
.nav-cta:hover { background: var(--sky-dk); color: #fff; text-decoration: none; transform: translateY(-1px); }

.dark-btn {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.2);
  background: rgba(255,255,255,.08);
  color: #fff;
  font-size: .95rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--t-base);
}
.dark-btn:hover { background: rgba(255,255,255,.18); transform: rotate(15deg); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.hamburger span { display: block; width: 22px; height: 2px; background: #fff; border-radius: 2px; transition: all var(--t-base); }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0; right: 0;
  background: #0a1929;
  max-height: calc(100vh - var(--nav-h));
  overflow-y: auto;
  z-index: 8999;
  padding: var(--sp-3) var(--sp-4) var(--sp-6);
  box-shadow: var(--shadow-xl);
}
.mobile-nav.open { display: block; animation: slideDown .2s ease; }
@keyframes slideDown { from { opacity:0; transform:translateY(-8px); } to { opacity:1; transform:translateY(0); } }
.mobile-nav a {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  font-size: .92rem;
  font-weight: 500;
  color: rgba(255,255,255,.78);
  border-radius: var(--r-md);
  transition: background var(--t-fast);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,.05);
}
.mobile-nav a:hover { background: rgba(255,255,255,.08); color: #fff; text-decoration: none; }
.mobile-nav a.active { color: #93c5fd; }
.mobile-section {
  font-size: .68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: rgba(255,255,255,.28);
  padding: var(--sp-4) var(--sp-4) var(--sp-2);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: .8rem;
  color: rgba(255,255,255,.45);
  margin-bottom: var(--sp-4);
}
.breadcrumb a { color: rgba(255,255,255,.55); transition: color var(--t-fast); }
.breadcrumb a:hover { color: #fff; text-decoration: none; }
.breadcrumb .sep { opacity: .4; }

/* ================================================================
   7. BUTTONS
   ================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 10px 22px;
  border-radius: var(--r-md);
  font-family: var(--font-sans);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--t-base);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.2;
  letter-spacing: .01em;
}
.btn:hover { transform: translateY(-2px); text-decoration: none; }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--sky); color: #fff; border-color: var(--sky); }
.btn-primary:hover { background: var(--sky-dk); border-color: var(--sky-dk); color: #fff; box-shadow: 0 4px 14px rgba(59,130,246,.35); }

.btn-navy { background: var(--navy); color: #fff; border-color: var(--navy); }
.btn-navy:hover { background: var(--navy-dk); border-color: var(--navy-dk); color: #fff; }

.btn-gold { background: var(--gold); color: #fff; border-color: var(--gold); }
.btn-gold:hover { background: var(--gold-dk); border-color: var(--gold-dk); color: #fff; }

.btn-outline { background: transparent; color: var(--sky); border-color: var(--sky); }
.btn-outline:hover { background: var(--sky-lt); color: var(--sky-dk); }

.btn-ghost { background: transparent; color: var(--gray-600); border-color: var(--gray-300); }
.btn-ghost:hover { background: var(--gray-100); border-color: var(--gray-400); color: var(--gray-700); }

.btn-danger { background: var(--red); color: #fff; border-color: var(--red); }
.btn-danger:hover { background: #b91c1c; border-color: #b91c1c; color: #fff; }

.btn-sm  { padding: 7px 16px; font-size: .82rem; }
.btn-lg  { padding: 13px 30px; font-size: .98rem; }
.btn-xl  { padding: 16px 38px; font-size: 1.05rem; }
.btn-full { width: 100%; justify-content: center; }

/* ================================================================
   8. CARDS
   ================================================================ */
.card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--t-base), transform var(--t-base), border-color var(--t-base);
}
.card-hover:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--sky);
}
.card-link { cursor: pointer; display: block; text-decoration: none; }
.card-link:hover { text-decoration: none; }

/* Article card */
.article-card { display: flex; flex-direction: column; gap: var(--sp-3); }
.article-card .card-category {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--sky);
}
.article-card h3 { margin: 0; font-size: 1rem; color: var(--navy); line-height: 1.4; }
[data-theme="dark"] .article-card h3 { color: var(--gray-700); }
.article-card p { font-size: .87rem; color: var(--gray-500); margin: 0; }
.article-card .read-more { font-size: .82rem; font-weight: 700; color: var(--sky); margin-top: auto; padding-top: var(--sp-2); }

/* Subject card */
.subject-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  transition: all var(--t-base);
}
.subject-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.subject-card-head {
  padding: var(--sp-5) var(--sp-5) var(--sp-4);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  background: linear-gradient(120deg, var(--navy-lt) 0%, var(--white) 100%);
  border-bottom: 1px solid var(--gray-200);
}
[data-theme="dark"] .subject-card-head { background: linear-gradient(120deg, #1a2d45 0%, #1e293b 100%); }
.subject-icon { font-size: 1.75rem; }
.subject-card-head h3 { margin: 0 0 2px; font-size: .95rem; }
.subject-card-head span { font-size: .74rem; color: var(--gray-500); }
.years-wrap { padding: var(--sp-4); display: flex; flex-wrap: wrap; gap: var(--sp-2); }
.yr-btn {
  padding: 5px 11px;
  border-radius: var(--r-sm);
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  font-size: .78rem;
  font-weight: 700;
  color: var(--gray-600);
  cursor: pointer;
  transition: all var(--t-fast);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.yr-btn:hover {
  background: var(--sky);
  color: #fff;
  border-color: var(--sky);
  transform: translateY(-1px);
  text-decoration: none;
}

/* Feature card */
.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  padding: var(--sp-8) var(--sp-6);
  text-align: center;
  transition: all var(--t-base);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}
.feature-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: var(--sky);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}
.feature-card:hover::after { transform: scaleX(1); }
.feature-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-6px); border-color: var(--sky); text-decoration: none; }
.feature-card .fi { font-size: 2.5rem; }
.feature-card h3 { margin: 0; color: var(--navy); font-size: 1.1rem; }
[data-theme="dark"] .feature-card h3 { color: var(--gray-700); }
.feature-card p { font-size: .88rem; color: var(--gray-500); margin: 0; }
.feature-card .fc-cta { font-size: .85rem; font-weight: 700; color: var(--sky); }

/* Tool card */
.tool-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  padding: var(--sp-8) var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
.tool-header { display: flex; align-items: flex-start; gap: var(--sp-4); }
.tool-icon   { font-size: 2.2rem; flex-shrink: 0; }
.tool-header h2 { font-size: 1.25rem; margin-bottom: var(--sp-1); }
.tool-header p  { font-size: .87rem; color: var(--gray-500); margin: 0; }

/* ================================================================
   9. FORMS
   ================================================================ */
.form-group { display: flex; flex-direction: column; gap: var(--sp-2); }
.form-label { font-size: .82rem; font-weight: 700; color: var(--gray-700); letter-spacing: .03em; }
.required   { color: var(--red); }

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-size: .92rem;
  color: var(--gray-800);
  background: var(--white);
  border: 1.5px solid var(--gray-300);
  border-radius: var(--r-md);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  outline: none;
  appearance: none;
}
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--sky);
  box-shadow: 0 0 0 3px rgba(59,130,246,.12);
}
.form-textarea { resize: vertical; min-height: 130px; line-height: 1.65; }
[data-theme="dark"] .form-input,
[data-theme="dark"] .form-textarea,
[data-theme="dark"] .form-select {
  background: #1e293b;
  color: var(--gray-700);
  border-color: #334155;
}

.form-hint { font-size: .78rem; color: var(--gray-400); }
.form-row  { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-4); }

/* Checkbox / Toggle */
.checkbox-group { display: flex; align-items: center; gap: var(--sp-3); cursor: pointer; }
.checkbox-group input[type="checkbox"] {
  width: 16px; height: 16px;
  accent-color: var(--sky);
  cursor: pointer;
}
.checkbox-label { font-size: .88rem; color: var(--gray-700); cursor: pointer; }

/* Progress check item (roadmap) */
.check-item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: background var(--t-fast);
  border: 1px solid transparent;
}
.check-item:hover { background: var(--gray-50); border-color: var(--gray-200); }
.check-item.done  { opacity: .65; }
.check-item.done .check-box { background: var(--green); border-color: var(--green); color: #fff; }
.check-box {
  width: 20px; height: 20px;
  border: 2px solid var(--gray-300);
  border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: .75rem;
  flex-shrink: 0;
  transition: all var(--t-fast);
}
.check-label { font-size: .9rem; color: var(--gray-700); flex: 1; }
.check-item.done .check-label { text-decoration: line-through; color: var(--gray-400); }

/* ================================================================
   10. BADGES & PILLS
   ================================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: var(--r-full);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  white-space: nowrap;
}
.badge-sky    { background: var(--sky-lt);    color: var(--sky-dk); }
.badge-navy   { background: var(--navy-lt);   color: var(--navy); }
.badge-gold   { background: var(--gold-lt);   color: var(--gold-dk); }
.badge-green  { background: var(--green-lt);  color: var(--green); }
.badge-red    { background: var(--red-lt);    color: var(--red); }
.badge-purple { background: var(--purple-lt); color: var(--purple); }
.badge-teal   { background: var(--teal-lt);   color: var(--teal); }
.badge-gray   { background: var(--gray-100);  color: var(--gray-600); }

.pill {
  display: inline-block;
  padding: 7px 17px;
  border-radius: var(--r-full);
  font-size: .84rem;
  font-weight: 600;
  border: 1.5px solid var(--gray-300);
  background: var(--white);
  color: var(--gray-600);
  cursor: pointer;
  transition: all var(--t-base);
  text-decoration: none;
}
.pill:hover, .pill.active {
  background: var(--sky);
  color: #fff;
  border-color: var(--sky);
  text-decoration: none;
}

/* ================================================================
   11. PAGE HEROES
   ================================================================ */
.page-hero {
  background: linear-gradient(135deg, var(--navy-dk) 0%, var(--navy) 55%, #1e4976 100%);
  padding: var(--sp-12) 0 var(--sp-10);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(59,130,246,.1) 0%, transparent 65%);
}
.page-hero > * { position: relative; }
.page-hero h1 { color: #fff; margin-bottom: var(--sp-3); }
.page-hero p  { color: rgba(255,255,255,.65); font-size: 1.05rem; max-width: 580px; margin: 0 auto; }
.page-hero .hero-badges { display: flex; gap: var(--sp-2); justify-content: center; flex-wrap: wrap; margin-bottom: var(--sp-5); }

/* Section heading */
.section-title { text-align: center; margin-bottom: var(--sp-10); }
.section-title h2 { margin-bottom: var(--sp-3); }
.section-title h2::after {
  content: '';
  display: block;
  width: 44px; height: 3px;
  background: var(--gold);
  margin: var(--sp-3) auto 0;
  border-radius: 2px;
}
.section-title p { color: var(--gray-500); max-width: 540px; margin: 0 auto; font-size: 1.02rem; }

/* ================================================================
   12. STATS
   ================================================================ */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: var(--sp-4); }
.stat-box {
  background: var(--navy-lt);
  border: 1px solid rgba(26,53,87,.12);
  border-radius: var(--r-md);
  padding: var(--sp-5) var(--sp-3);
  text-align: center;
}
[data-theme="dark"] .stat-box { background: #1a2d45; border-color: #334155; }
.stat-num   { display: block; font-family: var(--font-serif); font-size: 2rem; color: var(--navy); line-height: 1; margin-bottom: var(--sp-1); }
[data-theme="dark"] .stat-num { color: #93c5fd; }
.stat-label { font-size: .68rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: .08em; font-weight: 700; }

/* Stats bar (hero strip) */
.stats-strip { background: var(--navy); padding: 0; }
.stats-strip-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
}
.strip-stat {
  flex: 1;
  padding: var(--sp-6) var(--sp-4);
  text-align: center;
  border-right: 1px solid rgba(255,255,255,.1);
}
.strip-stat:last-child { border-right: none; }
.strip-num   { display: block; font-family: var(--font-serif); font-size: 1.75rem; color: #93c5fd; line-height: 1; margin-bottom: 4px; }
.strip-label { font-size: .68rem; color: rgba(255,255,255,.48); text-transform: uppercase; letter-spacing: .08em; font-weight: 700; }

/* ================================================================
   13. ALERTS
   ================================================================ */
.alert {
  padding: 13px 17px;
  border-radius: var(--r-md);
  font-size: .88rem;
  font-weight: 500;
  border: 1px solid;
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  line-height: 1.5;
}
.alert-success { background: var(--green-lt); color: var(--green); border-color: #86efac; }
.alert-warning { background: #fff7ed; color: #c2410c; border-color: #fdba74; }
.alert-info    { background: var(--sky-lt); color: var(--sky-dk); border-color: #93c5fd; }
.alert-error   { background: var(--red-lt); color: var(--red); border-color: #fca5a5; }
[data-theme="dark"] .alert-success { background: #052e16; border-color: #16a34a; }
[data-theme="dark"] .alert-warning { background: #431407; border-color: #c2410c; }
[data-theme="dark"] .alert-info    { background: #1e3a5f; border-color: #3b82f6; }
[data-theme="dark"] .alert-error   { background: #450a0a; border-color: #dc2626; }

/* ================================================================
   14. PROGRESS COMPONENTS
   ================================================================ */
.progress-bar-wrap { background: var(--gray-200); border-radius: var(--r-full); height: 8px; overflow: hidden; }
.progress-bar-fill { height: 100%; border-radius: var(--r-full); background: var(--sky); transition: width .5s ease; }
.progress-bar-fill.gold   { background: var(--gold); }
.progress-bar-fill.green  { background: var(--green); }
.progress-bar-fill.purple { background: var(--purple); }

.progress-ring { position: relative; display: inline-flex; align-items: center; justify-content: center; }
.progress-ring svg { transform: rotate(-90deg); }
.progress-ring .ring-bg    { fill: none; stroke: var(--gray-200); }
.progress-ring .ring-fill  { fill: none; stroke: var(--sky); stroke-linecap: round; transition: stroke-dashoffset .6s ease; }
.progress-ring .ring-label { position: absolute; text-align: center; }

/* MCQ components */
.mcq-opt {
  width: 100%;
  padding: 12px 17px;
  text-align: left;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--r-md);
  background: var(--white);
  font-family: var(--font-sans);
  font-size: .9rem;
  color: var(--gray-700);
  cursor: pointer;
  transition: all var(--t-fast);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.mcq-opt:hover:not(:disabled) { border-color: var(--sky); background: var(--sky-lt); color: var(--sky-dk); }
.opt-key {
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--gray-100);
  border: 1.5px solid var(--gray-300);
  display: flex; align-items: center; justify-content: center;
  font-size: .72rem; font-weight: 800;
  flex-shrink: 0;
  transition: all var(--t-fast);
}
.mcq-opt:hover:not(:disabled) .opt-key { background: var(--sky); border-color: var(--sky); color: #fff; }
.mcq-opt.correct  { border-color: var(--green);  background: var(--green-lt);  color: var(--green); }
.mcq-opt.wrong    { border-color: var(--red);    background: var(--red-lt);    color: var(--red); }
.mcq-opt.reveal   { border-color: var(--green);  background: var(--green-lt);  color: var(--green); }
.mcq-opt.correct .opt-key { background: var(--green);  border-color: var(--green);  color: #fff; }
.mcq-opt.wrong  .opt-key  { background: var(--red);    border-color: var(--red);    color: #fff; }
.mcq-opt.reveal .opt-key  { background: var(--green);  border-color: var(--green);  color: #fff; }
[data-theme="dark"] .mcq-opt { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .mcq-opt.correct { background: #052e16; }
[data-theme="dark"] .mcq-opt.wrong   { background: #450a0a; }
[data-theme="dark"] .mcq-opt.reveal  { background: #052e16; }

.mcq-prog-bar { height: 5px; background: var(--gray-200); border-radius: 3px; overflow: hidden; margin-bottom: var(--sp-4); }
.mcq-prog-fill { height: 100%; background: var(--sky); border-radius: 3px; transition: width .4s ease; }

/* Output box (generator) */
.output-box {
  background: var(--gold-lt);
  border: 1.5px solid var(--gold);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  animation: fadeUp .3s ease;
}
.output-box .ol { font-size: .68rem; font-weight: 800; color: var(--gold); text-transform: uppercase; letter-spacing: .1em; margin-bottom: var(--sp-2); }
.output-box .ot { font-family: var(--font-serif); font-size: 1.15rem; color: var(--gray-800); line-height: 1.5; margin-bottom: var(--sp-2); }
.output-box .oh { font-size: .84rem; color: var(--gray-500); font-style: italic; }
[data-theme="dark"] .output-box { background: #2a1f0e; border-color: var(--gold); }
[data-theme="dark"] .output-box .ot { color: var(--gray-700); }

/* Question structure */
.q-type { padding: 12px 17px; border-radius: var(--r-md); border: 1px solid; font-weight: 700; font-size: .92rem; margin-bottom: var(--sp-4); }
.q-discuss  { background: var(--green-lt); border-color: #86efac; color: var(--green); }
.q-analyze  { background: #fff7ed; border-color: #fdba74; color: #c2410c; }
.q-evaluate { background: var(--red-lt); border-color: #fca5a5; color: var(--red); }
.q-explain  { background: var(--sky-lt); border-color: #93c5fd; color: var(--sky-dk); }
.q-default  { background: var(--navy-lt); border-color: #93c5fd; color: var(--navy); }
.q-step { display: flex; gap: var(--sp-3); padding: var(--sp-3) 0; border-bottom: 1px solid var(--gray-200); font-size: .88rem; color: var(--gray-600); align-items: flex-start; }
.q-step:last-child { border-bottom: none; }
.q-step-n { width: 22px; height: 22px; background: var(--sky); color: #fff; border-radius: 50%; font-size: .72rem; font-weight: 800; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }

/* Feedback */
.fb-item { display: flex; gap: var(--sp-3); padding: var(--sp-3) 0; border-bottom: 1px solid var(--gray-200); font-size: .88rem; color: var(--gray-600); align-items: flex-start; }
.fb-item:last-child { border-bottom: none; }
.fb-icon { flex-shrink: 0; }

/* Precis */
.precis-pass {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--sky);
  border-radius: var(--r-md);
  padding: var(--sp-5) var(--sp-6);
  font-size: .96rem;
  line-height: 1.85;
  color: var(--gray-700);
  font-style: italic;
}
.precis-fb { padding: 14px 17px; border-radius: var(--r-md); border: 1px solid; font-size: .9rem; font-weight: 500; animation: fadeUp .3s ease; }
.precis-good { background: var(--green-lt); border-color: #86efac; color: var(--green); }
.precis-warn { background: #fff7ed; border-color: #fdba74; color: #c2410c; }
.precis-bad  { background: var(--red-lt); border-color: #fca5a5; color: var(--red); }

/* ================================================================
   15. FOOTER
   ================================================================ */
.footer {
  background: #060e1a;
  color: rgba(255,255,255,.65);
  padding: var(--sp-12) 0 var(--sp-6);
  margin-top: auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr 1fr;
  gap: var(--sp-8);
  margin-bottom: var(--sp-8);
}
.footer-brand .brand-name { color: #fff; font-size: 1.1rem; margin-bottom: var(--sp-2); display: block; }
.footer-brand p { font-size: .82rem; color: rgba(255,255,255,.38); line-height: 1.7; max-width: 240px; }
.footer-col h4 { color: rgba(255,255,255,.8); font-family: var(--font-sans); font-weight: 700; font-size: .78rem; text-transform: uppercase; letter-spacing: .09em; margin-bottom: var(--sp-4); }
.footer-col ul { display: flex; flex-direction: column; gap: var(--sp-2); }
.footer-col a { font-size: .84rem; color: rgba(255,255,255,.42); transition: color var(--t-fast); }
.footer-col a:hover { color: #fff; text-decoration: none; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: var(--sp-5);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-3);
}
.footer-bottom p { font-size: .77rem; color: rgba(255,255,255,.28); margin: 0; }
.footer-bottom-links { display: flex; gap: var(--sp-4); }
.footer-bottom-links a { font-size: .77rem; color: rgba(255,255,255,.35); }
.footer-bottom-links a:hover { color: #fff; text-decoration: none; }

/* ================================================================
   16. ANIMATIONS
   ================================================================ */
@keyframes fadeUp   { from { opacity:0; transform:translateY(14px); } to { opacity:1; transform:translateY(0); } }
@keyframes fadeIn   { from { opacity:0; } to { opacity:1; } }
@keyframes scaleIn  { from { opacity:0; transform:scale(.95); } to { opacity:1; transform:scale(1); } }
@keyframes pulse    { 0%,100%{opacity:1;} 50%{opacity:.5;} }

.animate-fade-up { animation: fadeUp .4s ease both; }
.animate-scale   { animation: scaleIn .3s ease both; }

/* Scroll-triggered animations */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .5s ease, transform .5s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .18s; }
.reveal-delay-3 { transition-delay: .26s; }
.reveal-delay-4 { transition-delay: .34s; }

/* ================================================================
   17. UTILITY CLASSES
   ================================================================ */
.hidden { display: none !important; }
.sr-only { position: absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
.text-center { text-align: center; }
.text-right  { text-align: right; }
.text-muted  { color: var(--gray-500); }
.text-sm     { font-size: .85rem; }
.text-xs     { font-size: .76rem; }
.text-navy   { color: var(--navy); }
.text-sky    { color: var(--sky); }
.text-gold   { color: var(--gold); }
.text-green  { color: var(--green); }
.text-red    { color: var(--red); }
.fw-700 { font-weight: 700; }
.divider { border: none; border-top: 1px solid var(--gray-200); }
.rounded { border-radius: var(--r-md); }
.w-full { width: 100%; }

/* Spacing */
.mt-1{margin-top:var(--sp-1)} .mt-2{margin-top:var(--sp-2)} .mt-3{margin-top:var(--sp-3)}
.mt-4{margin-top:var(--sp-4)} .mt-6{margin-top:var(--sp-6)} .mt-8{margin-top:var(--sp-8)}
.mb-1{margin-bottom:var(--sp-1)} .mb-2{margin-bottom:var(--sp-2)} .mb-3{margin-bottom:var(--sp-3)}
.mb-4{margin-bottom:var(--sp-4)} .mb-6{margin-bottom:var(--sp-6)} .mb-8{margin-bottom:var(--sp-8)}
.p-4{padding:var(--sp-4)} .p-6{padding:var(--sp-6)}

/* ================================================================
   18. RESPONSIVE
   ================================================================ */
@media (max-width: 1100px) {
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
  .footer-grid .footer-col:nth-child(5) { display: none; }
}

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--sp-6); }
}

@media (max-width: 768px) {
  :root { --nav-h: 62px; }
  .nav-links { display: none !important; }
  .nav-cta   { display: none; }
  .hamburger { display: flex; }
  .section   { padding: var(--sp-10) 0; }
  .section-title { margin-bottom: var(--sp-8); }
  .grid-2    { grid-template-columns: 1fr; }
  .grid-3    { grid-template-columns: 1fr; }
  .grid-4    { grid-template-columns: repeat(2,1fr); }
  .form-row  { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-strip-inner { flex-wrap: wrap; }
  .strip-stat { flex: 1 1 50%; border-right: none; border-bottom: 1px solid rgba(255,255,255,.08); }
  .strip-stat:last-child { border-bottom: none; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .container, .container-sm, .container-md { padding: 0 var(--sp-4); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .grid-4 { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2,1fr); }
  .btn-xl { padding: 13px 26px; font-size: .95rem; }
  .years-wrap { gap: var(--sp-2); }
  .yr-btn { padding: 4px 9px; font-size: .75rem; }
}

/* ================================================================
   DASHBOARD SPECIFIC
   ================================================================ */
.dash-grid { display: grid; grid-template-columns: 280px 1fr; gap: var(--sp-6); align-items: start; }
.dash-sidebar { position: sticky; top: calc(var(--nav-h) + var(--sp-6)); }
.dash-card { background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--r-lg); padding: var(--sp-5); margin-bottom: var(--sp-4); }
.dash-stat-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: var(--sp-3); }
.dash-stat { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: var(--r-md); padding: var(--sp-4); text-align: center; }
.dash-stat .ds-num { font-family: var(--font-serif); font-size: 1.6rem; color: var(--navy); display: block; line-height: 1; margin-bottom: 4px; }
[data-theme="dark"] .dash-stat .ds-num { color: #93c5fd; }
.dash-stat .ds-lbl { font-size: .7rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: .07em; font-weight: 700; }
@media(max-width:900px) { .dash-grid { grid-template-columns: 1fr; } .dash-sidebar { position: static; } }

/* ================================================================
   ROADMAP SPECIFIC
   ================================================================ */
.roadmap-subject { background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--r-lg); margin-bottom: var(--sp-4); overflow: hidden; }
.roadmap-header {
  padding: var(--sp-4) var(--sp-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: background var(--t-fast);
  border-bottom: 1px solid transparent;
  user-select: none;
}
.roadmap-header:hover { background: var(--gray-50); }
.roadmap-header.open  { border-bottom-color: var(--gray-200); background: var(--navy-lt); }
[data-theme="dark"] .roadmap-header.open { background: #1a2d45; }
.roadmap-header-left { display: flex; align-items: center; gap: var(--sp-3); }
.roadmap-icon { font-size: 1.5rem; }
.roadmap-header h3 { margin: 0; font-size: 1rem; }
.roadmap-progress { display: flex; align-items: center; gap: var(--sp-3); }
.roadmap-pct { font-size: .8rem; font-weight: 700; color: var(--sky); min-width: 36px; text-align: right; }
.roadmap-bar-sm { width: 80px; height: 6px; background: var(--gray-200); border-radius: 3px; overflow: hidden; }
.roadmap-bar-fill { height: 100%; background: var(--sky); border-radius: 3px; transition: width .4s ease; }
.roadmap-chevron { font-size: .8rem; color: var(--gray-400); transition: transform var(--t-base); }
.roadmap-header.open .roadmap-chevron { transform: rotate(180deg); }
.roadmap-body { display: none; padding: var(--sp-4) var(--sp-5); }
.roadmap-body.open { display: block; animation: fadeIn .2s ease; }
.topic-group { margin-bottom: var(--sp-4); }
.topic-group h4 { font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; color: var(--gray-400); margin-bottom: var(--sp-2); padding-bottom: var(--sp-1); border-bottom: 1px solid var(--gray-200); }
.topic-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-1); }
@media(max-width:600px) { .topic-list { grid-template-columns: 1fr; } .roadmap-bar-sm { width: 50px; } }

/* ================================================================
   PLANNER SPECIFIC
   ================================================================ */
.planner-week { display: grid; grid-template-columns: repeat(7,1fr); gap: var(--sp-2); margin: var(--sp-6) 0; }
.day-card { background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--r-md); padding: var(--sp-3); min-height: 120px; }
.day-card .day-name { font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .07em; color: var(--gray-400); margin-bottom: var(--sp-2); }
.day-task { background: var(--sky-lt); border-left: 3px solid var(--sky); border-radius: var(--r-sm); padding: var(--sp-2) var(--sp-3); margin-bottom: var(--sp-2); font-size: .78rem; color: var(--sky-dk); font-weight: 500; }
.day-task.gold-task { background: var(--gold-lt); border-color: var(--gold); color: var(--gold-dk); }
.day-task.green-task { background: var(--green-lt); border-color: var(--green); color: var(--green); }
@media(max-width:768px) { .planner-week { grid-template-columns: repeat(4,1fr); } }
@media(max-width:480px) { .planner-week { grid-template-columns: repeat(2,1fr); } }

/* ================================================================
   ANALYTICS SPECIFIC
   ================================================================ */
.chart-wrap { background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--r-lg); padding: var(--sp-6); }
.chart-title { font-size: .85rem; font-weight: 700; color: var(--gray-700); margin-bottom: var(--sp-5); text-transform: uppercase; letter-spacing: .05em; }
.bar-chart { display: flex; flex-direction: column; gap: var(--sp-3); }
.bar-row { display: flex; align-items: center; gap: var(--sp-3); }
.bar-label { font-size: .82rem; color: var(--gray-600); min-width: 180px; flex-shrink: 0; }
.bar-track { flex: 1; height: 24px; background: var(--gray-100); border-radius: var(--r-sm); overflow: hidden; }
.bar-fill  { height: 100%; background: var(--sky); border-radius: var(--r-sm); display: flex; align-items: center; padding-left: var(--sp-3); transition: width .8s ease; }
.bar-fill span { font-size: .72rem; font-weight: 700; color: #fff; white-space: nowrap; }
.bar-count { font-size: .82rem; font-weight: 700; color: var(--gray-600); min-width: 30px; }
@media(max-width:600px) { .bar-label { min-width: 120px; font-size: .76rem; } }