/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;line-height:1.6;color:#1a1a2e;background:#fafafc;overflow-x:hidden}
:root[data-theme="dark"] body{color:#e8e8f0;background:#0f0f1a}

/* Skip link */
.skip-link{position:absolute;top:-100px;left:16px;z-index:999;background:#1a1a2e;color:#fff;padding:8px 16px;border-radius:6px;text-decoration:none;font-size:14px}
.skip-link:focus{top:16px}

/* ===== Typography ===== */
h1,h2,h3{line-height:1.25;font-weight:700}
h1{font-size:clamp(2.5rem,6vw,4.5rem)}
h2{font-size:clamp(1.75rem,4vw,2.5rem)}
h3{font-size:clamp(1.1rem,2.5vw,1.35rem)}
a{color:inherit;text-decoration:none}

/* ===== Header ===== */
.header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(250,250,252,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid rgba(0,0,0,.06)}
:root[data-theme="dark"] .header{background:rgba(15,15,26,.85);border-bottom-color:rgba(255,255,255,.06)}
.header-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between}
.logo{font-size:24px;font-weight:800;letter-spacing:-.5px;color:#1a1a2e}
:root[data-theme="dark"] .logo{color:#fff}
.logo-dot{color:#e94560}
.nav{display:flex;gap:32px}
.nav a{font-size:15px;font-weight:500;opacity:.7;transition:opacity .2s}
.nav a:hover{opacity:1}
.header-actions{display:flex;gap:8px;align-items:center}

/* Buttons */
.lang-btn,.theme-btn{display:flex;align-items:center;gap:4px;padding:6px 10px;border:none;border-radius:8px;background:rgba(0,0,0,.04);color:inherit;cursor:pointer;font-size:13px;font-weight:600;transition:background .2s}
:root[data-theme="dark"] .lang-btn,:root[data-theme="dark"] .theme-btn{background:rgba(255,255,255,.06)}
.lang-btn:hover,.theme-btn:hover{background:rgba(0,0,0,.08)}
:root[data-theme="dark"] .lang-btn:hover,:root[data-theme="dark"] .theme-btn:hover{background:rgba(255,255,255,.12)}
.theme-btn .sun{display:block}
:root[data-theme="dark"] .theme-btn .sun{display:none}

.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:12px;font-size:16px;font-weight:600;transition:all .25s;cursor:pointer;border:none;text-decoration:none}
.btn-primary{background:#e94560;color:#fff}
.btn-primary:hover{background:#d63850;transform:translateY(-1px);box-shadow:0 8px 25px rgba(233,69,96,.3)}
.btn-ghost{border:2px solid rgba(0,0,0,.12);background:transparent;color:inherit}
:root[data-theme="dark"] .btn-ghost{border-color:rgba(255,255,255,.15)}
.btn-ghost:hover{background:rgba(0,0,0,.04)}
:root[data-theme="dark"] .btn-ghost:hover{background:rgba(255,255,255,.06)}

/* ===== Hero ===== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:100px 24px 80px;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:radial-gradient(ellipse 80% 60% at 50% 40%,rgba(233,69,96,.08),transparent 70%),radial-gradient(ellipse 40% 50% at 80% 80%,rgba(66,133,244,.06),transparent 70%)}
:root[data-theme="dark"] .hero-bg{background:radial-gradient(ellipse 80% 60% at 50% 40%,rgba(233,69,96,.12),transparent 70%),radial-gradient(ellipse 40% 50% at 80% 80%,rgba(66,133,244,.08),transparent 70%)}
.hero-content{position:relative;text-align:center;max-width:720px}
.hero-title{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:24px}
.hero-title span{display:block}
.hero-title .accent{color:#e94560}
.fade-in{opacity:0;animation:fadeUp .8s ease forwards}
.delay-1{animation-delay:.2s}
.delay-2{animation-delay:.4s}
@keyframes fadeUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.hero-sub{font-size:clamp(1rem,2.2vw,1.2rem);opacity:.7;max-width:560px;margin:0 auto 36px;line-height:1.7}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:28px}
.hero-live{display:flex;align-items:center;justify-content:center;gap:8px;font-size:14px;opacity:.6}
.live-dot{width:8px;height:8px;border-radius:50%;background:#22c55e;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}

/* ===== Sections ===== */
.section{padding:80px 24px}
.section-alt{background:rgba(0,0,0,.02)}
:root[data-theme="dark"] .section-alt{background:rgba(255,255,255,.02)}
.section-header{text-align:center;max-width:640px;margin:0 auto 48px}
.section-header h2{margin-bottom:16px}
.section-header p{font-size:17px;opacity:.65;line-height:1.6}
.section-cta{text-align:center;margin-top:40px}

/* ===== Cards ===== */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;max-width:1200px;margin:0 auto}
.card{background:#fff;border-radius:16px;padding:28px;border:1px solid rgba(0,0,0,.06);transition:transform .25s,box-shadow .25s}
:root[data-theme="dark"] .card{background:rgba(255,255,255,.03);border-color:rgba(255,255,255,.06)}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(0,0,0,.08)}
:root[data-theme="dark"] .card:hover{box-shadow:0 12px 40px rgba(0,0,0,.3)}
.card-icon{font-size:36px;margin-bottom:16px}
.card h3{margin-bottom:8px;font-size:18px}
.card p{font-size:14px;opacity:.65;line-height:1.6;margin-bottom:16px}
.card-stat{font-size:13px;font-weight:600;color:#e94560}

/* ===== Stats ===== */
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;max-width:900px;margin:0 auto;text-align:center}
.stat-number{font-size:clamp(2rem,5vw,3.5rem);font-weight:800;color:#e94560;font-variant-numeric:tabular-nums}
.stat-label{font-size:15px;opacity:.6;margin-top:4px}

/* ===== Language Grid ===== */
.lang-grid{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;max-width:800px;margin:0 auto}
.lang-chip{padding:10px 18px;border-radius:24px;border:1px solid rgba(0,0,0,.1);font-size:14px;cursor:pointer;transition:all .2s;background:transparent;color:inherit}
:root[data-theme="dark"] .lang-chip{border-color:rgba(255,255,255,.1)}
.lang-chip:hover,.lang-chip.active{border-color:#e94560;color:#e94560;background:rgba(233,69,96,.06)}

/* ===== Contribute Cards ===== */
.contribute-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:900px;margin:0 auto}
.c-card{text-align:center;padding:32px 20px;background:#fff;border-radius:16px;border:1px solid rgba(0,0,0,.06)}
:root[data-theme="dark"] .c-card{background:rgba(255,255,255,.03);border-color:rgba(255,255,255,.06)}
.c-card-icon{font-size:40px;margin-bottom:16px}
.c-card h3{margin-bottom:8px}
.c-card p{font-size:14px;opacity:.65;line-height:1.5}

/* ===== Footer ===== */
.footer{border-top:1px solid rgba(0,0,0,.06);padding:40px 24px}
:root[data-theme="dark"] .footer{border-color:rgba(255,255,255,.06)}
.footer-inner{max-width:1200px;margin:0 auto;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.footer-brand p{font-size:14px;opacity:.5;margin-top:4px}
.footer-links{display:flex;gap:24px}
.footer-links a{font-size:14px;opacity:.6;transition:opacity .2s}
.footer-links a:hover{opacity:1}
.footer-copy{font-size:13px;opacity:.4;width:100%;text-align:center;margin-top:8px}

/* ===== Language Modal ===== */
.lang-modal{position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center}
.lang-modal[hidden]{display:none}
.lang-modal-bg{position:absolute;inset:0;background:rgba(0,0,0,.4);backdrop-filter:blur(4px)}
.lang-modal-content{position:relative;background:#fff;border-radius:16px;padding:28px;max-width:500px;width:90%;max-height:80vh;overflow-y:auto;box-shadow:0 25px 80px rgba(0,0,0,.2)}
:root[data-theme="dark"] .lang-modal-content{background:#1a1a2e}
.lang-modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}
.lang-modal-close{background:none;border:none;font-size:28px;cursor:pointer;color:inherit;opacity:.5;padding:0 4px;line-height:1}
.lang-modal-close:hover{opacity:1}
.lang-modal-list{display:flex;flex-direction:column;gap:4px}
.lang-option{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:10px;border:none;background:transparent;color:inherit;cursor:pointer;font-size:15px;width:100%;text-align:left;transition:background .15s}
.lang-option:hover{background:rgba(0,0,0,.04)}
:root[data-theme="dark"] .lang-option:hover{background:rgba(255,255,255,.04)}
.lang-option.active{background:rgba(233,69,96,.08);color:#e94560;font-weight:600}
.lang-flag{font-size:22px;width:28px;text-align:center}

/* ===== Scroll reveal ===== */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .6s,transform .6s}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ===== Responsive ===== */
@media(max-width:768px){
  .nav{display:none}
  .cards{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .contribute-cards{grid-template-columns:1fr}
  .hero-actions{flex-direction:column;align-items:center}
  .section{padding:60px 16px}
}
@media(min-width:769px){
  .nav{display:flex}
}