/* ============ SVIDEA — Silicon Valley Innovation Development Entrepreneurship Alliance ============ */
/* Design language: modern Silicon Valley startup/VC site — light canvas, violet→blue gradient accents,
   Space Grotesk display + Inter body, glass cards, soft glow blobs. */

:root{
  --bg:#fafaf9;
  --bg-2:#f4f3fb;
  --surface:#ffffff;
  --surface-2:#f7f6fd;
  --border:rgba(20,20,30,.08);
  --border-strong:rgba(20,20,30,.14);
  --text:#15161d;
  --text-soft:#4c4e5c;
  --text-mute:#7577857a;
  --text-mute-solid:#75778a;
  --violet:#7c3aed;
  --blue:#2563eb;
  --teal:#0f9488;
  --grad:linear-gradient(90deg,#7c3aed 0%,#2563eb 100%);
  --grad-soft:linear-gradient(135deg,rgba(124,58,237,.09),rgba(37,99,235,.07));
  --radius:18px;
  --radius-sm:12px;
  --shadow:0 24px 64px rgba(20,20,40,.10);
  --shadow-sm:0 10px 28px rgba(20,20,40,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Segoe UI',sans-serif;
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  position:relative;
  overflow-x:hidden;
}
h1,h2,h3,h4{
  font-family:'Space Grotesk','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-weight:700;
  letter-spacing:-0.02em;
  margin:0;
  color:var(--text);
}
p{margin:0}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{margin:0;padding:0;list-style:none}
button{font-family:inherit}

/* background ambience */
.bg-glow{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.bg-glow::before,.bg-glow::after{
  content:"";position:absolute;width:640px;height:640px;border-radius:50%;
  filter:blur(120px);opacity:.16;
}
.bg-glow::before{background:var(--violet);top:-220px;right:-160px}
.bg-glow::after{background:var(--blue);bottom:-260px;left:-200px;opacity:.13}
.bg-grid{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(20,20,30,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(20,20,30,.045) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 90% 60% at 50% 0%,#000 40%,transparent 100%);
}

.wrap{max-width:1160px;margin:0 auto;padding:0 24px;position:relative;z-index:1}
.section{padding:88px 0;position:relative;z-index:1}
.section-tight{padding:56px 0}

/* ---------- Topbar ---------- */
.topbar{
  position:sticky;top:0;z-index:500;
  background:rgba(250,250,249,.78);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--border);
}
.topbar-inner{
  max-width:1160px;margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;gap:20px;
}
.brand{display:flex;align-items:center;gap:11px;font-weight:700;flex:none}
.brand-mark{
  width:34px;height:34px;border-radius:10px;overflow:hidden;flex:none;
  background:var(--grad);display:grid;place-items:center;box-shadow:0 6px 18px rgba(124,58,237,.35);
}
.brand-mark img{width:100%;height:100%;object-fit:cover;mix-blend-mode:luminosity;opacity:.92}
.brand-text{font-family:'Space Grotesk',sans-serif;font-size:16.5px;letter-spacing:.02em;line-height:1.2}
.brand-text small{display:block;font-family:'Inter',sans-serif;font-weight:500;font-size:11px;color:var(--text-mute-solid);letter-spacing:.02em;margin-top:1px}
.topnav{display:flex;gap:2px;margin-left:auto}
.topnav a{
  padding:8px 13px;border-radius:999px;font-size:14px;font-weight:500;color:var(--text-soft);
  transition:all .15s ease;white-space:nowrap;
}
.topnav a:hover{color:var(--text);background:rgba(20,20,30,.05)}
.topnav a.active{color:var(--text);background:rgba(20,20,30,.07)}
.top-actions{display:flex;align-items:center;gap:10px;flex:none}
.lang-toggle{
  padding:7px 13px;border-radius:999px;border:1px solid var(--border-strong);background:transparent;
  color:var(--text-soft);font-size:12.5px;font-weight:700;letter-spacing:.03em;cursor:pointer;transition:all .15s ease;
}
.lang-toggle:hover{border-color:var(--violet);color:var(--text)}
.nav-toggle{display:none;background:none;border:1px solid var(--border-strong);border-radius:9px;padding:6px 10px;color:var(--text);font-size:17px;cursor:pointer}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;
  font-size:14.5px;font-weight:600;cursor:pointer;border:none;transition:all .18s ease;white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 26px rgba(124,92,246,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(124,92,246,.42)}
.btn-ghost{background:rgba(20,20,30,.03);color:var(--text);border:1px solid var(--border-strong)}
.btn-ghost:hover{background:rgba(20,20,30,.06);border-color:rgba(20,20,30,.24)}
.btn-sm{padding:9px 16px;font-size:13px}

/* ---------- Hero ---------- */
.hero{padding:112px 0 72px;position:relative;z-index:1}
.kicker-pill{
  display:inline-flex;align-items:center;gap:8px;padding:6px 15px;border-radius:999px;
  background:var(--grad-soft);border:1px solid rgba(124,58,237,.24);
  font-size:12.5px;font-weight:600;letter-spacing:.06em;color:#6d28d9;text-transform:uppercase;
}
.kicker-pill .dot{width:6px;height:6px;border-radius:50%;background:var(--teal);box-shadow:0 0 8px var(--teal)}
.hero h1{
  font-size:clamp(36px,5.4vw,64px);line-height:1.12;margin-top:22px;max-width:880px;
}
.hero h1 .grad{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero .sub{
  margin-top:22px;font-size:18px;color:var(--text-soft);max-width:640px;line-height:1.75;
}
.hero-cta{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}

/* ---------- Stats ---------- */
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:56px}
.stat-tile{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:20px 20px;box-shadow:var(--shadow-sm);
}
.stat-tile .num{
  font-family:'Space Grotesk',sans-serif;font-size:28px;font-weight:700;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:-.02em;
}
.stat-tile .lbl{font-size:12.5px;color:var(--text-mute-solid);margin-top:6px;line-height:1.5}

/* ---------- Section headers ---------- */
.sec-head{max-width:680px;margin-bottom:44px}
.sec-kicker{font-size:12.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--teal)}
.sec-head h2{font-size:clamp(26px,3.4vw,38px);margin-top:12px;line-height:1.25}
.sec-head p{margin-top:14px;color:var(--text-soft);font-size:15.5px;line-height:1.75}

/* ---------- Feature / value cards ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feature-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:28px 26px;transition:all .2s ease;
}
.feature-card:hover{border-color:rgba(124,58,237,.4);transform:translateY(-3px);box-shadow:var(--shadow-sm)}
.feature-ic{
  width:44px;height:44px;border-radius:12px;background:var(--grad-soft);border:1px solid rgba(124,58,237,.3);
  display:grid;place-items:center;font-size:20px;margin-bottom:18px;
}
.feature-card h3{font-size:17.5px;margin-bottom:9px}
.feature-card p{font-size:14px;color:var(--text-soft);line-height:1.75}

/* ---------- Generic card grid ---------- */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;transition:all .2s ease;
}
.card:hover{border-color:rgba(124,58,237,.35);transform:translateY(-3px);box-shadow:var(--shadow-sm)}

/* ---------- Meetup group cards ---------- */
.meetup-card{
  display:flex;align-items:center;gap:14px;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:18px 20px;transition:all .18s ease;
}
.meetup-card:hover{border-color:rgba(124,58,237,.4);background:var(--surface-2)}
.meetup-ic{
  width:42px;height:42px;border-radius:11px;background:var(--grad-soft);border:1px solid rgba(124,58,237,.3);
  display:grid;place-items:center;font-size:18px;flex:none;
}
.meetup-info{flex:1;min-width:0}
.meetup-info .name{font-weight:700;font-size:14.5px;color:var(--text)}
.meetup-info .url{font-size:12.5px;color:var(--text-mute-solid);margin-top:2px;font-family:ui-monospace,'SF Mono',Consolas,monospace}
.meetup-count{
  flex:none;text-align:right;font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:15px;color:var(--teal);
}
.meetup-count small{display:block;font-family:'Inter',sans-serif;font-weight:500;font-size:10.5px;color:var(--text-mute-solid);margin-top:1px}
.meetup-arrow{flex:none;color:var(--text-mute-solid);font-size:16px;transition:transform .15s ease}
.meetup-card:hover .meetup-arrow{transform:translateX(3px);color:var(--text)}
.meetup-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}

/* ---------- Team cards ---------- */
.team-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.team-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:26px 18px;text-align:center;transition:all .2s ease;
}
.team-card:hover{border-color:rgba(124,58,237,.4);transform:translateY(-3px)}
.avatar{
  width:64px;height:64px;border-radius:50%;margin:0 auto 16px;display:grid;place-items:center;
  background:var(--grad);color:#fff;font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:20px;
  box-shadow:0 8px 22px rgba(124,92,246,.3);
}
.team-card .name{font-weight:700;font-size:15px}
.team-card .title{font-size:12.5px;color:var(--teal);margin-top:5px;font-weight:600}

/* ---------- Partner org cards ---------- */
.partner-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.partner-card{
  display:flex;align-items:flex-start;gap:14px;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:20px;transition:all .18s ease;
}
.partner-card:hover{border-color:rgba(124,58,237,.4);background:var(--surface-2)}
.partner-badge{
  flex:none;width:42px;height:42px;border-radius:11px;background:var(--grad);color:#fff;
  display:grid;place-items:center;font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:15px;
}
.partner-info .name-en{font-weight:700;font-size:14.5px}
.partner-info .name-zh{font-size:13px;color:var(--text-soft);margin-top:3px}

/* ---------- Timeline / pillars ---------- */
.pillar-list{display:grid;gap:14px}
.pillar{
  display:flex;gap:18px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:24px 26px;align-items:flex-start;
}
.pillar-num{
  flex:none;width:38px;height:38px;border-radius:11px;background:var(--grad-soft);border:1px solid rgba(124,58,237,.3);
  display:grid;place-items:center;font-family:'Space Grotesk',sans-serif;font-weight:700;color:#c9b8ff;font-size:15px;
}
.pillar h3{font-size:16.5px;margin-bottom:7px}
.pillar p{font-size:14px;color:var(--text-soft);line-height:1.75}

/* ---------- Quote / mission block ---------- */
.mission-block{
  background:linear-gradient(160deg,rgba(124,58,237,.10),rgba(37,99,235,.05));
  border:1px solid rgba(124,58,237,.22);border-radius:24px;padding:44px 46px;
}
.mission-block p{font-size:18px;color:var(--text);line-height:1.85}
.mission-block p+p{margin-top:18px;color:var(--text-soft);font-size:15px}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.contact-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:28px 24px;text-align:center;
}
.contact-ic{
  width:46px;height:46px;border-radius:13px;margin:0 auto 16px;background:var(--grad-soft);
  border:1px solid rgba(124,58,237,.3);display:grid;place-items:center;font-size:20px;
}
.contact-card .lbl{font-size:12.5px;color:var(--text-mute-solid);text-transform:uppercase;letter-spacing:.06em;font-weight:700}
.contact-card .val{font-size:16px;font-weight:700;margin-top:8px;font-family:'Space Grotesk',sans-serif}

/* ---------- CTA band ---------- */
.cta-band{
  background:var(--grad);border-radius:28px;padding:56px 48px;text-align:center;position:relative;overflow:hidden;
}
.cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 30% 20%,rgba(255,255,255,.25),transparent 60%)}
.cta-band h2{font-size:clamp(24px,3.2vw,34px);color:#fff;position:relative;z-index:1}
.cta-band p{color:rgba(255,255,255,.88);margin-top:12px;font-size:15.5px;position:relative;z-index:1}
.cta-band .hero-cta{justify-content:center;position:relative;z-index:1}
.cta-band .btn-ghost{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.4);color:#fff}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.22)}
.cta-band .btn-primary{background:#fff;color:#171a29;box-shadow:0 10px 26px rgba(0,0,0,.25)}

/* ---------- Footer ---------- */
footer{border-top:1px solid var(--border);padding:48px 0 32px;position:relative;z-index:1}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.foot-brand{display:flex;align-items:center;gap:10px;font-weight:700}
.foot-desc{margin-top:14px;color:var(--text-mute-solid);font-size:13.5px;line-height:1.8;max-width:320px}
.foot-col h4{font-size:12.5px;text-transform:uppercase;letter-spacing:.07em;color:var(--text-mute-solid);margin-bottom:14px}
.foot-col a{display:block;font-size:13.5px;color:var(--text-soft);margin-bottom:10px}
.foot-col a:hover{color:var(--text)}
.foot-bottom{
  margin-top:40px;padding-top:24px;border-top:1px solid var(--border);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
  font-size:12.5px;color:var(--text-mute-solid);
}

/* ---------- zh-only / en-only toggling helper ---------- */
html[lang="en"] .zh-only{display:none}
html:not([lang="en"]) .en-only{display:none}

/* ---------- Responsive ---------- */
@media (max-width:980px){
  .topnav{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;
    background:rgba(7,7,11,.97);border-bottom:1px solid var(--border);padding:10px 18px;gap:2px;}
  .topnav.open{display:flex}
  .nav-toggle{display:block}
  .feature-grid,.card-grid{grid-template-columns:1fr}
  .team-grid{grid-template-columns:repeat(2,1fr)}
  .meetup-grid,.partner-grid,.contact-grid,.foot-grid{grid-template-columns:1fr}
  .stat-row{grid-template-columns:repeat(2,1fr)}
  .mission-block{padding:32px 26px}
  .cta-band{padding:40px 26px}
}
@media (max-width:560px){
  .hero{padding:88px 0 48px}
  .section{padding:64px 0}
  .team-grid{grid-template-columns:1fr 1fr}
}

/* ---------- AI chat widget (bottom-right pop-up) ---------- */
.ai-chat-launcher{
  position:fixed;right:24px;bottom:24px;z-index:900;
  display:flex;align-items:center;gap:9px;
  padding:0 18px 0 15px;height:54px;border:0;border-radius:999px;
  background:var(--grad);color:#fff;cursor:pointer;
  font-family:'Space Grotesk','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-size:14.5px;font-weight:600;letter-spacing:-0.01em;
  box-shadow:0 14px 34px rgba(124,92,246,.38);
  transition:transform .22s ease,box-shadow .22s ease,opacity .18s ease;
}
.ai-chat-launcher:hover{transform:translateY(-2px);box-shadow:0 18px 42px rgba(124,92,246,.48)}
.ai-chat-launcher svg{width:22px;height:22px;flex:none}
.ai-chat-launcher .ai-chat-launcher-label{white-space:nowrap}
.ai-chat-launcher[hidden]{display:none}

.ai-chat-panel{
  position:fixed;right:24px;bottom:24px;z-index:901;
  width:390px;height:min(620px,calc(100vh - 48px));
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--surface);border:1px solid var(--border-strong);
  border-radius:var(--radius);box-shadow:var(--shadow);
  opacity:0;transform:translateY(14px) scale(.98);pointer-events:none;
  transition:opacity .22s ease,transform .22s ease,right .22s ease,left .22s ease,top .22s ease,bottom .22s ease,width .22s ease,height .22s ease;
}
.ai-chat-panel.open{opacity:1;transform:none;pointer-events:auto}
.ai-chat-panel.expanded{
  right:16px;left:16px;top:16px;bottom:16px;
  width:auto;height:auto;
}
.ai-chat-head{
  display:flex;align-items:center;gap:10px;flex:none;
  padding:13px 12px 13px 18px;background:var(--grad);color:#fff;
}
.ai-chat-head-text{display:flex;flex-direction:column;line-height:1.3;margin-right:auto;min-width:0}
.ai-chat-head-text strong{
  font-family:'Space Grotesk','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-size:15px;font-weight:700;letter-spacing:-0.01em;
}
.ai-chat-head-text span{font-size:12px;opacity:.85}
.ai-chat-act{
  display:flex;align-items:center;justify-content:center;flex:none;
  width:32px;height:32px;padding:0;border:0;border-radius:10px;
  background:rgba(255,255,255,.14);color:#fff;cursor:pointer;
  transition:background .18s ease;
}
.ai-chat-act:hover{background:rgba(255,255,255,.26)}
.ai-chat-act svg{width:16px;height:16px}
.ai-chat-body{position:relative;flex:1;min-height:0;background:var(--surface-2)}
.ai-chat-body iframe{width:100%;height:100%;border:0;display:block;background:var(--surface)}
.ai-chat-fallback{
  position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:14px;
  padding:28px;text-align:center;color:var(--text-soft);font-size:14px;
}
.ai-chat-fallback[hidden]{display:none}

@media (max-width:560px){
  .ai-chat-launcher{right:16px;bottom:16px;height:50px;padding:0 16px 0 13px}
  .ai-chat-panel{
    right:10px;left:10px;bottom:10px;width:auto;
    height:min(640px,calc(100vh - 20px));
  }
}