/* ===================================================================
   EDUVERSE — SHARED STYLESHEET
   1. Variables  2. Reset  3. Typography  4. Global  5. Navigation
   6. Hero  7. Buttons  8. Cards  9. Sections  10. Forms  11. Footer
   12. Responsive  13. Dark Mode  14. Animations
=================================================================== */

/* ---------- 1. VARIABLES ---------- */
:root{
  --navy:#0B1220;
  --blue:#2563EB;
  --blue-bright:#3B82F6;
  --purple:#7C3AED;
  --bg-light:#F8FAFC;
  --white:#FFFFFF;
  --text:#111827;
  --text-muted:#64748B;
  --success:#16A34A;

  --border:#E2E8F0;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.08);
  --shadow-md:0 8px 24px -8px rgba(15,23,42,.16);
  --shadow-lg:0 24px 48px -16px rgba(15,23,42,.24);

  --radius-sm:10px;
  --radius-md:16px;
  --radius-lg:24px;

  --font-display:"Poppins", "Inter", system-ui, sans-serif;
  --font-body:"Inter", system-ui, sans-serif;

  --container:1240px;
  --nav-h:76px;

  --grad-primary:linear-gradient(135deg, var(--blue) 0%, var(--purple) 100%);
  --grad-soft:linear-gradient(180deg, rgba(37,99,235,.06) 0%, rgba(124,58,237,.02) 100%);

  --transition:.25s cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"]{
  --navy:#EAF0FF;
  --bg-light:#0B1220;
  --white:#111A2E;
  --text:#EAF0FF;
  --text-muted:#94A3B8;
  --border:#22304D;
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);
  --shadow-md:0 8px 24px -8px rgba(0,0,0,.5);
  --shadow-lg:0 24px 48px -16px rgba(0,0,0,.6);
  --grad-soft:linear-gradient(180deg, rgba(37,99,235,.12) 0%, rgba(124,58,237,.04) 100%);
}

/* ---------- 2. RESET ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button,input,textarea,select{font:inherit;color:inherit;}
ul{list-style:none;}
svg{display:block;}

/* ---------- 3. TYPOGRAPHY ---------- */
body{
  font-family:var(--font-body);
  color:var(--text);
  background:var(--bg-light);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  transition:background var(--transition), color var(--transition);
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  color:var(--navy);
  line-height:1.15;
  letter-spacing:-.01em;
}
[data-theme="dark"] h1,[data-theme="dark"] h2,[data-theme="dark"] h3,[data-theme="dark"] h4{color:var(--text);}
h1{font-size:clamp(2.25rem, 1.6rem + 3vw, 3.75rem); font-weight:700;}
h2{font-size:clamp(1.75rem, 1.4rem + 1.6vw, 2.75rem);}
h3{font-size:clamp(1.25rem, 1.1rem + .7vw, 1.6rem);}
p{color:var(--text-muted);}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
  color:var(--blue);
  background:rgba(37,99,235,.08);
  padding:6px 14px;border-radius:999px;
  margin-bottom:16px;
}
.section-head{max-width:640px;margin:0 auto 48px;text-align:center;}
.section-head p{margin-top:14px;font-size:1.05rem;}
.section-head.left{margin:0 0 40px;text-align:left;}

/* ---------- 4. GLOBAL ---------- */
.container{max-width:var(--container);margin:0 auto;padding:0 24px;}
section{padding:88px 0;}
.section-alt{background:var(--white);}
main{display:block;}
.skip-link{
  position:absolute;left:-999px;top:0;background:var(--blue);color:#fff;padding:12px 20px;
  border-radius:0 0 8px 0;z-index:200;
}
.skip-link:focus{left:0;}
:focus-visible{outline:3px solid var(--blue-bright);outline-offset:2px;border-radius:4px;}

/* ---------- 5. NAVIGATION ---------- */
.site-nav{
  position:sticky;top:0;z-index:100;
  height:var(--nav-h);
  display:flex;align-items:center;
  background:rgba(248,250,252,.85);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:box-shadow var(--transition), background var(--transition), height var(--transition), border-color var(--transition);
}
[data-theme="dark"] .site-nav{background:rgba(11,18,32,.85);}
.site-nav.scrolled{
  height:64px;
  box-shadow:var(--shadow-sm);
  border-bottom-color:var(--border);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;width:100%;}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;font-size:1.25rem;color:var(--navy);}
[data-theme="dark"] .brand{color:var(--text);}
.brand-mark{
  width:36px;height:36px;border-radius:10px;
  background:var(--grad-primary);
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:700;font-size:1.1rem;
  flex-shrink:0;
}
.nav-links{display:flex;align-items:center;gap:6px;}
.nav-links a{
  padding:10px 14px;border-radius:8px;font-weight:500;font-size:.95rem;color:var(--text);
  transition:background var(--transition), color var(--transition);
}
.nav-links a:hover, .nav-links a.active{background:rgba(37,99,235,.08);color:var(--blue);}
.nav-actions{display:flex;align-items:center;gap:10px;}
.theme-toggle{
  width:40px;height:40px;border-radius:50%;border:1px solid var(--border);
  background:var(--white);cursor:pointer;display:flex;align-items:center;justify-content:center;
  transition:background var(--transition), transform var(--transition);
}
.theme-toggle:hover{transform:translateY(-2px);}
.theme-toggle svg{width:18px;height:18px;stroke:var(--text);}
.hamburger{
  display:none;width:42px;height:42px;border-radius:8px;border:1px solid var(--border);
  background:var(--white);cursor:pointer;position:relative;
}
.hamburger span{
  position:absolute;left:11px;right:11px;height:2px;background:var(--text);border-radius:2px;
  transition:transform var(--transition), opacity var(--transition);
}
.hamburger span:nth-child(1){top:15px;}
.hamburger span:nth-child(2){top:20px;}
.hamburger span:nth-child(3){top:25px;}
.hamburger.open span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.hamburger.open span:nth-child(2){opacity:0;}
.hamburger.open span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}
.mobile-menu{
  display:none;position:fixed;top:var(--nav-h);left:0;right:0;
  background:var(--white);border-bottom:1px solid var(--border);box-shadow:var(--shadow-md);
  max-height:0;overflow:hidden;transition:max-height var(--transition);
  z-index:99;
}
.mobile-menu.open{max-height:520px;}
.mobile-menu .container{padding:12px 24px 24px;display:flex;flex-direction:column;gap:4px;}
.mobile-menu a{padding:14px 4px;border-bottom:1px solid var(--border);font-weight:500;}
.mobile-menu a:last-child{border-bottom:none;}
.mobile-menu .btn{margin-top:16px;}

/* ---------- 6. HERO ---------- */
.hero{
  position:relative;overflow:hidden;
  padding:72px 0 96px;
  background:var(--grad-soft);
}
.hero-shape{position:absolute;border-radius:50%;filter:blur(60px);opacity:.35;z-index:0;}
.hero-shape.s1{width:420px;height:420px;background:var(--blue-bright);top:-160px;right:-120px;}
.hero-shape.s2{width:320px;height:320px;background:var(--purple);bottom:-140px;left:-100px;}
.hero-grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;
}
.hero-copy h1{margin-bottom:20px;}
.hero-copy h1 .accent{
  background:var(--grad-primary);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-copy p.lead{font-size:1.15rem;max-width:520px;margin-bottom:32px;}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:28px;}
.hero-search{
  display:flex;align-items:center;gap:10px;
  background:var(--white);border:1px solid var(--border);border-radius:999px;
  padding:6px 6px 6px 20px;max-width:520px;box-shadow:var(--shadow-sm);
  transition:box-shadow var(--transition), border-color var(--transition);
}
.hero-search:focus-within{box-shadow:0 0 0 4px rgba(37,99,235,.15);border-color:var(--blue-bright);}
.hero-search svg{flex-shrink:0;width:19px;height:19px;stroke:var(--text-muted);}
.hero-search input{flex:1;border:none;background:none;padding:10px 0;font-size:.98rem;outline:none;}
.hero-search button{
  background:var(--grad-primary);color:#fff;border:none;border-radius:999px;
  padding:11px 22px;font-weight:600;font-size:.92rem;cursor:pointer;white-space:nowrap;
  transition:transform var(--transition), box-shadow var(--transition);
}
.hero-search button:hover{transform:translateY(-1px);box-shadow:var(--shadow-md);}
.hero-visual{position:relative;}
.hero-card{
  background:var(--white);border-radius:var(--radius-lg);border:1px solid var(--border);
  box-shadow:var(--shadow-lg);padding:28px;position:relative;overflow:hidden;
  animation:float 6s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(0);}50%{transform:translateY(-12px);}}
.hero-illustration{width:100%;aspect-ratio:4/3;border-radius:var(--radius-md);}
.hero-badge{
  position:absolute;bottom:-18px;left:24px;background:var(--white);border:1px solid var(--border);
  border-radius:var(--radius-md);padding:14px 18px;box-shadow:var(--shadow-md);
  display:flex;align-items:center;gap:12px;
}
.hero-badge .dot{width:34px;height:34px;border-radius:10px;background:rgba(22,163,74,.12);display:flex;align-items:center;justify-content:center;color:var(--success);flex-shrink:0;}
.hero-badge strong{display:block;font-size:.85rem;color:var(--navy);}
[data-theme="dark"] .hero-badge strong{color:var(--text);}
.hero-badge span{font-size:.78rem;color:var(--text-muted);}

/* ---------- 7. BUTTONS ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 26px;border-radius:12px;font-weight:600;font-size:.96rem;
  border:1px solid transparent;cursor:pointer;transition:transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  white-space:nowrap;
}
.btn svg{width:16px;height:16px;transition:transform var(--transition);}
.btn:hover svg{transform:translateX(3px);}
.btn-primary{background:var(--grad-primary);color:#fff;box-shadow:var(--shadow-sm);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);}
.btn-secondary{background:var(--white);color:var(--navy);border-color:var(--border);}
[data-theme="dark"] .btn-secondary{color:var(--text);}
.btn-secondary:hover{border-color:var(--blue-bright);color:var(--blue);transform:translateY(-2px);}
.btn-ghost{background:transparent;color:var(--blue);padding:10px 4px;}
.btn-ghost:hover{gap:12px;}
.btn-block{width:100%;}
.btn-sm{padding:9px 16px;font-size:.85rem;border-radius:9px;}

/* ---------- 8. CARDS ---------- */
.card{
  background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);
  padding:28px;transition:transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:rgba(37,99,235,.25);}
.card-icon{
  width:52px;height:52px;border-radius:14px;background:rgba(37,99,235,.1);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;color:var(--blue);
}
.card-icon svg{width:24px;height:24px;}
.card h3{margin-bottom:8px;}
.card p{font-size:.94rem;}
.card-link{
  display:inline-flex;align-items:center;gap:6px;margin-top:16px;font-weight:600;color:var(--blue);font-size:.92rem;
}
.card-link svg{width:14px;height:14px;transition:transform var(--transition);}
.card:hover .card-link svg{transform:translateX(4px);}

/* Quick access */
.quick-access{margin-top:-56px;position:relative;z-index:2;}
.quick-grid{
  display:grid;grid-template-columns:repeat(5,1fr);gap:16px;
  background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);
  border:1px solid var(--border);padding:22px;
}
.quick-item{
  display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center;
  padding:16px 10px;border-radius:var(--radius-sm);transition:background var(--transition), transform var(--transition);
}
.quick-item:hover{background:rgba(37,99,235,.06);transform:translateY(-4px);}
.quick-item .emoji{font-size:1.7rem;}
.quick-item span{font-weight:600;font-size:.88rem;color:var(--navy);}
[data-theme="dark"] .quick-item span{color:var(--text);}

/* grids */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.grid-5{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;}

/* Class cards */
.class-card{
  background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:32px;position:relative;overflow:hidden;transition:transform var(--transition), box-shadow var(--transition);
}
.class-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);}
.class-card .num{
  font-family:var(--font-display);font-weight:700;font-size:2.6rem;
  background:var(--grad-primary);-webkit-background-clip:text;background-clip:text;color:transparent;
  line-height:1;
}
.class-card .subjects-tags{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0;}
.class-card .tag{font-size:.76rem;font-weight:600;color:var(--purple);background:rgba(124,58,237,.08);padding:5px 11px;border-radius:999px;}
.class-card.disabled{opacity:.55;}
.class-card .soon{
  position:absolute;top:20px;right:20px;font-size:.7rem;font-weight:700;letter-spacing:.05em;
  background:var(--text-muted);color:#fff;padding:4px 10px;border-radius:999px;text-transform:uppercase;
}

/* Subject cards */
.subject-card{
  background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:30px;text-align:left;transition:transform var(--transition), box-shadow var(--transition);
  border-top:4px solid var(--blue);
}
.subject-card:nth-child(2){border-top-color:var(--purple);}
.subject-card:nth-child(3){border-top-color:var(--success);}
.subject-card:nth-child(4){border-top-color:#F59E0B;}
.subject-card:nth-child(5){border-top-color:var(--blue-bright);}
.subject-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);}
.subject-card .glyph{font-size:2.1rem;margin-bottom:14px;}

/* Note / resource cards */
.note-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:24px;transition:transform var(--transition), box-shadow var(--transition);}
.note-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);}
.note-tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;color:var(--blue);background:rgba(37,99,235,.08);padding:4px 10px;border-radius:6px;margin-bottom:12px;}
.note-card h3{font-size:1.15rem;margin-bottom:8px;}
.note-meta{display:flex;align-items:center;gap:10px;margin-top:14px;font-size:.8rem;color:var(--text-muted);}
.diff{width:8px;height:8px;border-radius:50%;background:var(--success);}
.diff.med{background:#F59E0B;}
.diff.hard{background:#DC2626;}

/* ---------- 9. SECTIONS (misc layouts) ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;}
.timeline-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative;}
.timeline-strip::before{content:"";position:absolute;top:26px;left:0;right:0;height:2px;background:var(--border);}
.timeline-item{position:relative;text-align:center;padding:0 16px;}
.timeline-item .dotnum{
  width:52px;height:52px;border-radius:50%;background:var(--white);border:2px solid var(--blue);color:var(--blue);
  display:flex;align-items:center;justify-content:center;font-weight:700;margin:0 auto 18px;position:relative;z-index:1;
}
.badge-stat{display:flex;align-items:center;gap:14px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:18px 22px;box-shadow:var(--shadow-sm);}
.why-list{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.why-item{display:flex;gap:16px;padding:24px;border-radius:var(--radius-md);background:var(--white);border:1px solid var(--border);}
.why-item .card-icon{margin-bottom:0;flex-shrink:0;}

/* FAQ */
.faq-list{max-width:760px;margin:0 auto;}
.faq-item{border-bottom:1px solid var(--border);}
.faq-q{
  width:100%;text-align:left;background:none;border:none;padding:22px 4px;cursor:pointer;
  display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1.02rem;color:var(--navy);
}
[data-theme="dark"] .faq-q{color:var(--text);}
.faq-q svg{width:18px;height:18px;flex-shrink:0;transition:transform var(--transition);stroke:var(--blue);}
.faq-item.open .faq-q svg{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height var(--transition);}
.faq-item.open .faq-a{max-height:260px;}
.faq-a p{padding:0 4px 22px;}

/* Final CTA */
.final-cta{
  background:var(--navy);border-radius:var(--radius-lg);padding:72px 48px;text-align:center;
  position:relative;overflow:hidden;
}
.final-cta::before{
  content:"";position:absolute;inset:0;background:var(--grad-primary);opacity:.18;
}
.final-cta h2, .final-cta p{color:#fff;position:relative;}
.final-cta p{color:rgba(255,255,255,.75);max-width:520px;margin:14px auto 32px;}
.final-cta .hero-actions{justify-content:center;position:relative;}

/* Toast */
.toast{
  position:fixed;bottom:28px;left:50%;transform:translateX(-50%) translateY(120%);
  background:var(--navy);color:#fff;padding:14px 24px;border-radius:12px;font-size:.9rem;font-weight:500;
  box-shadow:var(--shadow-lg);z-index:300;transition:transform var(--transition);
}
.toast.show{transform:translateX(-50%) translateY(0);}

/* ---------- 10. FORMS ---------- */
.form-group{margin-bottom:20px;}
label{display:block;font-weight:600;font-size:.9rem;margin-bottom:8px;color:var(--navy);}
[data-theme="dark"] label{color:var(--text);}
input:not([type=checkbox]):not([type=radio]),textarea,select{
  width:100%;padding:13px 16px;border-radius:10px;border:1px solid var(--border);
  background:var(--white);font-size:.95rem;transition:border-color var(--transition), box-shadow var(--transition);
}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--blue-bright);box-shadow:0 0 0 4px rgba(37,99,235,.12);}
textarea{resize:vertical;min-height:140px;}
.field-error{color:#DC2626;font-size:.8rem;margin-top:6px;display:none;}
.form-group.invalid input,.form-group.invalid textarea{border-color:#DC2626;}
.form-group.invalid .field-error{display:block;}
.form-note{background:rgba(37,99,235,.06);border:1px solid rgba(37,99,235,.2);border-radius:12px;padding:16px 20px;font-size:.88rem;color:var(--text-muted);margin-bottom:28px;}

/* filters */
.filter-bar{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:36px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:20px;}
.filter-bar select, .filter-bar input{max-width:220px;}

/* MCQ */
.quiz-box{max-width:680px;margin:0 auto;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);padding:36px;box-shadow:var(--shadow-md);}
.quiz-progress{height:6px;background:var(--border);border-radius:999px;overflow:hidden;margin-bottom:28px;}
.quiz-progress-bar{height:100%;background:var(--grad-primary);width:0%;transition:width var(--transition);}
.quiz-meta{display:flex;justify-content:space-between;font-size:.85rem;color:var(--text-muted);margin-bottom:18px;}
.quiz-option{
  display:flex;align-items:center;gap:12px;padding:15px 18px;border:1px solid var(--border);border-radius:12px;
  margin-bottom:12px;cursor:pointer;transition:border-color var(--transition), background var(--transition);
}
.quiz-option:hover{border-color:var(--blue-bright);}
.quiz-option.selected{border-color:var(--blue);background:rgba(37,99,235,.06);}
.quiz-option.correct{border-color:var(--success);background:rgba(22,163,74,.08);}
.quiz-option.incorrect{border-color:#DC2626;background:rgba(220,38,38,.08);}
.quiz-option input{width:auto;}
.quiz-actions{display:flex;justify-content:space-between;align-items:center;margin-top:24px;}
.quiz-result{text-align:center;}
.quiz-result .score{font-family:var(--font-display);font-size:3rem;font-weight:700;background:var(--grad-primary);-webkit-background-clip:text;background-clip:text;color:transparent;margin:20px 0;}

/* Search */
.search-page-box{max-width:720px;margin:0 auto 48px;}
.search-results{display:flex;flex-direction:column;gap:14px;max-width:820px;margin:0 auto;}
.search-result-item{background:var(--white);border:1px solid var(--border);border-radius:12px;padding:18px 22px;}
.no-results{text-align:center;padding:60px 20px;color:var(--text-muted);}

/* ---------- 11. FOOTER ---------- */
.site-footer{background:var(--navy);color:rgba(255,255,255,.75);padding:72px 0 28px;margin-top:60px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.1);}
.footer-brand .brand{color:#fff;margin-bottom:14px;}
.footer-brand p{color:rgba(255,255,255,.6);max-width:280px;}
.site-footer h4{color:#fff;font-size:.95rem;margin-bottom:18px;}
.site-footer ul{display:flex;flex-direction:column;gap:12px;}
.site-footer a{color:rgba(255,255,255,.65);font-size:.92rem;transition:color var(--transition);}
.site-footer a:hover{color:#fff;}
.footer-bottom{padding-top:24px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;font-size:.85rem;color:rgba(255,255,255,.5);}

/* Page header (inner pages) */
.page-hero{padding:56px 0 64px;background:var(--grad-soft);text-align:center;}
.page-hero .eyebrow{margin-bottom:14px;}
.breadcrumb{display:flex;justify-content:center;gap:8px;font-size:.85rem;color:var(--text-muted);margin-bottom:16px;}
.breadcrumb a{color:var(--blue);font-weight:600;}

/* Accordion (used generically) */
.chapter-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);padding:22px 26px;margin-bottom:14px;}
.chapter-head{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;}
.chapter-head h3{font-size:1.05rem;}
.resource-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px;}
.resource-links a{font-size:.8rem;font-weight:600;padding:7px 14px;border-radius:8px;background:var(--bg-light);border:1px solid var(--border);color:var(--text);}
.resource-links a:hover{border-color:var(--blue-bright);color:var(--blue);}
.resource-links a.soon{opacity:.55;pointer-events:none;}

/* ---------- 12. RESPONSIVE ---------- */
@media(max-width:1024px){
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .grid-5{grid-template-columns:repeat(3,1fr);}
  .why-list{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .quick-grid{grid-template-columns:repeat(3,1fr);}
}
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;}
  .hero-visual{order:-1;max-width:420px;margin:0 auto;}
  .split{grid-template-columns:1fr;}
  .nav-links{display:none;}
  .hamburger{display:block;}
  .mobile-menu{display:block;}
  .timeline-strip{grid-template-columns:1fr 1fr;row-gap:32px;}
  .timeline-strip::before{display:none;}
  /* Prevent the nav bar from overflowing: the CTA button already
     appears inside the mobile dropdown, so drop it from the top bar. */
  .nav-actions{gap:8px;}
  .nav-actions > a.btn{display:none;}
}
@media(max-width:400px){
  .brand{font-size:1.05rem;gap:8px;}
  .brand-mark{width:32px;height:32px;font-size:1rem;}
  .theme-toggle{width:36px;height:36px;}
  .hamburger{width:38px;height:38px;}
}
@media(max-width:768px){
  section{padding:64px 0;}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr 1fr;}
  .grid-5{grid-template-columns:repeat(2,1fr);}
  .quick-grid{grid-template-columns:repeat(2,1fr);}
  .why-list{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .final-cta{padding:56px 24px;}
}
@media(max-width:560px){
  .container{padding:0 18px;}
  .grid-2,.grid-3,.grid-4,.grid-5{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .hero-actions{flex-direction:column;align-items:stretch;}
  .hero-actions .btn{width:100%;}
  .hero-search{flex-wrap:wrap;border-radius:20px;padding:14px;}
  .hero-search button{width:100%;}
  .filter-bar{flex-direction:column;}
  .filter-bar select,.filter-bar input{max-width:none;}
}

/* ---------- 13. DARK MODE EXTRAS ---------- */
[data-theme="dark"] .site-nav{border-bottom-color:var(--border);}
[data-theme="dark"] .theme-toggle,[data-theme="dark"] .hamburger{background:var(--white);border-color:var(--border);}
[data-theme="dark"] .hamburger span{background:var(--text);}
[data-theme="dark"] .eyebrow{background:rgba(59,130,246,.14);}
[data-theme="dark"] .card-icon{background:rgba(59,130,246,.14);}

/* ---------- 14. ANIMATIONS ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease, transform .6s ease;}
.reveal.in{opacity:1;transform:translateY(0);}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;}
  .hero-card{animation:none;}
}