/* ═══════════════════════════════════════════
   Clay Design System — Tokens, Components, Animations
   ═══════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&family=DM+Sans:wght@400;500;700&display=swap');

:root {
  --canvas: #F4F1FA;
  --card-bg: rgba(255,255,255,0.65);
  --glass-bg: rgba(255,255,255,0.55);
  --text-primary: #332F3A;
  --text-muted: #635F69;
  --text-on-accent: #ffffff;
  --accent: #7C3AED;
  --accent-light: #A78BFA;
  --accent-dark: #6D28D9;
  --accent-alt: #DB2777;
  --accent-blue: #0EA5E9;
  --accent-emerald: #10B981;
  --accent-amber: #F59E0B;
  --accent-rose: #F43F5E;
  --accent-cyan: #06B6D4;
  --radius-btn: 20px;
  --radius-card: 32px;
  --radius-container: 48px;
  --shadow-card: 16px 16px 32px rgba(160,150,180,0.2), -10px -10px 24px rgba(255,255,255,0.9), inset 6px 6px 12px rgba(139,92,246,0.03), inset -6px -6px 12px rgba(255,255,255,1);
  --shadow-card-hover: 20px 20px 48px rgba(160,150,180,0.25), -14px -14px 32px rgba(255,255,255,0.95), inset 6px 6px 12px rgba(139,92,246,0.03), inset -6px -6px 12px rgba(255,255,255,1);
  --shadow-btn: 12px 12px 24px rgba(139,92,246,0.3), -8px -8px 16px rgba(255,255,255,0.4), inset 4px 4px 8px rgba(255,255,255,0.4), inset -4px -4px 8px rgba(0,0,0,0.1);
  --shadow-btn-hover: 16px 16px 32px rgba(139,92,246,0.35), -10px -10px 20px rgba(255,255,255,0.5), inset 4px 4px 8px rgba(255,255,255,0.4), inset -4px -4px 8px rgba(0,0,0,0.1);
  --shadow-pressed: inset 10px 10px 20px #d9d4e3, inset -10px -10px 20px #ffffff;
  --shadow-nav: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-nav-scrolled: 0 8px 40px rgba(0,0,0,0.12);
  --font-heading: 'Nunito', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --ease-clay: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 200ms;
  --dur-med: 400ms;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);background:var(--canvas);color:var(--text-primary);line-height:1.7;min-height:100vh;-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,h4,h5,h6,.heading{font-family:var(--font-heading);font-weight:800;line-height:1.2}
h1{font-size:clamp(2rem,5vw,3.5rem);font-weight:900;letter-spacing:-0.02em}
h2{font-size:clamp(1.5rem,3.5vw,2.5rem)}
h3{font-size:1.5rem}h4{font-size:1.25rem}
p{color:var(--text-muted);max-width:65ch}
a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-dark)}

.shell-nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(255,255,255,0.75);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);border-bottom:1px solid rgba(160,150,180,0.12);transition:all var(--dur-med) var(--ease-smooth)}
.shell-nav.scrolled{background:rgba(255,255,255,0.92);box-shadow:var(--shadow-nav-scrolled)}
.nav-inner{max-width:1280px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 24px;height:64px}
.nav-brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--font-heading);font-weight:800;font-size:17px;color:var(--text-primary)}
.nav-brand .brand-icon{width:34px;height:34px;background:linear-gradient(135deg,var(--accent-light),var(--accent));border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:900;color:#fff}
.nav-brand span{color:var(--accent)}
.nav-links{display:flex;align-items:center;gap:4px;position:relative}
.nav-link{padding:8px 14px;border-radius:var(--radius-btn);text-decoration:none;font-size:14px;font-weight:600;color:var(--accent);transition:all var(--dur-fast)}
.nav-link:hover{color:var(--accent-dark);background:rgba(124,58,237,0.08)}
.nav-cta{padding:8px 22px;border-radius:var(--radius-btn);background:linear-gradient(135deg,var(--accent-light),var(--accent));color:#fff;text-decoration:none;font-size:14px;font-weight:700;transition:all var(--dur-fast)}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 4px 20px rgba(124,58,237,0.3);color:#fff}
.nav-progress{position:absolute;bottom:-2px;left:0;height:3px;background:linear-gradient(90deg,var(--accent-light),var(--accent));width:0%;transition:width .1s linear;border-radius:3px}

.nav-topics-btn{padding:8px 14px;border-radius:var(--radius-btn);background:none;border:none;color:var(--accent);font-family:var(--font-body);font-size:14px;font-weight:600;cursor:pointer;display:flex;align-items:center;gap:6px;transition:all var(--dur-fast)}
.nav-topics-btn:hover{color:var(--accent-dark);background:rgba(124,58,237,0.08)}

.topics-mega{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%) translateY(-8px);width:720px;max-width:90vw;background:#fff;border:1px solid rgba(160,150,180,0.15);border-radius:var(--radius-card);padding:24px;box-shadow:var(--shadow-card);opacity:0;visibility:hidden;transition:all .3s var(--ease-smooth);pointer-events:none;z-index:9999}
.topics-mega.open{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0);pointer-events:all}
.mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.mega-item{display:flex;align-items:center;gap:14px;padding:14px 18px;border-radius:20px;text-decoration:none;transition:all var(--dur-fast)}
.mega-item:hover{background:rgba(124,58,237,0.04);transform:translateX(4px)}
.mega-item .topic-dot{width:36px;height:36px;min-width:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:900;color:#fff}
.mega-item .topic-name{font-size:14px;font-weight:700;color:var(--text-primary)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:var(--radius-btn);font-family:var(--font-body);font-size:16px;font-weight:700;padding:14px 32px;cursor:pointer;transition:all var(--dur-fast);text-decoration:none;line-height:1;min-height:48px}
.btn-primary{background:linear-gradient(135deg,var(--accent-light),var(--accent));color:#fff;box-shadow:var(--shadow-btn)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-btn-hover);color:#fff}
.btn-primary:active{transform:scale(0.95);box-shadow:var(--shadow-pressed)}
.btn-secondary{background:#fff;color:var(--text-primary);box-shadow:var(--shadow-btn)}
.btn-secondary:hover{transform:translateY(-2px);box-shadow:var(--shadow-btn-hover)}
.btn-secondary:active{transform:scale(0.95);box-shadow:var(--shadow-pressed)}
.btn-outline{border:2px solid var(--accent);background:transparent;color:var(--accent)}
.btn-outline:hover{background:rgba(124,58,237,0.06);transform:translateY(-2px)}
.btn-sm{padding:10px 20px;font-size:14px;min-height:40px}
.btn-lg{padding:18px 40px;font-size:18px;min-height:56px}

.card{background:var(--card-bg);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-radius:var(--radius-card);padding:32px;box-shadow:var(--shadow-card);transition:all var(--dur-med) var(--ease-smooth);position:relative;overflow:hidden}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-card-hover)}
.card-glass{background:var(--glass-bg)}
.card-solid{background:#fff}

.breadcrumbs{display:flex;align-items:center;gap:8px;padding:80px 24px 12px;max-width:1280px;margin:0 auto;font-size:13px;color:var(--text-muted)}
.breadcrumbs a{color:#8a8498;text-decoration:none}
.breadcrumbs a:hover{color:var(--accent)}
.breadcrumbs .current{color:var(--text-primary);font-weight:700}
.breadcrumbs .separator{margin:0 2px;color:#d9d4e3}

.blobs{position:fixed;inset:0;pointer-events:none;z-index:-1;overflow:hidden}
.blob{position:absolute;border-radius:50%;filter:blur(80px);opacity:0.12}
.blob-1{width:60vh;height:60vh;top:-15%;left:-10%;background:var(--accent);animation:clay-float 8s ease-in-out infinite}
.blob-2{width:50vh;height:50vh;top:30%;right:-10%;background:var(--accent-alt);animation:clay-float-delayed 10s ease-in-out infinite}
.blob-3{width:40vh;height:40vh;bottom:10%;left:20%;background:var(--accent-blue);animation:clay-float-slow 12s ease-in-out infinite}
.blob-4{width:35vh;height:35vh;bottom:40%;right:15%;background:var(--accent-emerald);animation:clay-float 9s ease-in-out infinite 2s}

@keyframes clay-float{0%,100%{transform:translateY(0) rotate(0deg)}50%{transform:translateY(-20px) rotate(2deg)}}
@keyframes clay-float-delayed{0%,100%{transform:translateY(0) rotate(0deg)}50%{transform:translateY(-15px) rotate(-2deg)}}
@keyframes clay-float-slow{0%,100%{transform:translateY(0) rotate(0deg)}50%{transform:translateY(-30px) rotate(5deg)}}
@keyframes clay-breathe{0%,100%{transform:scale(1)}50%{transform:scale(1.04)}}
@keyframes fade-in{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}

.section{padding:80px 24px;position:relative}
.section-inner{max-width:1200px;margin:0 auto}
.section-header{text-align:center;margin-bottom:48px}
.section-label{font-family:var(--font-heading);font-size:14px;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:0.08em;margin-bottom:8px}
.section-desc{font-size:1.1rem;color:var(--text-muted);max-width:600px;margin:12px auto 0}

.site-footer{text-align:center;padding:40px 24px;border-top:1px solid rgba(160,150,180,0.12);font-size:13px;color:var(--text-muted)}
.site-footer a{color:var(--accent);text-decoration:none}
.site-footer a:hover{text-decoration:underline}

@media(max-width:768px){
  .section{padding:48px 16px}.card{padding:24px}
  .nav-inner{padding:0 16px}.nav-link{font-size:13px;padding:6px 10px}
  .nav-cta{padding:6px 16px;font-size:13px}
  .mega-grid{grid-template-columns:1fr}.topics-mega{width:90vw}
  .btn{padding:12px 24px;font-size:15px}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important}}

.mega-item .topic-count{font-size:12px;color:var(--text-muted);margin-top:2px}
.mega-subs{margin-top:6px;display:flex;flex-direction:column;gap:2px}
.mega-subs a{font-size:12px;color:#8a8498;text-decoration:none;padding:2px 0}
.mega-subs a:hover{color:var(--accent)}
.mega-subs a::before{content:"\203A ";color:var(--accent);font-weight:700}