/* ============ kwI 互联网风格 - 极光 + 顶部 + 时间线 ============ */
:root {
  --kwI-p: #4338ca;
  --kwI-s: #8b5cf6;
  --kwI-t: #06b6d4;
  --kwI-bg: #eef2ff;
  --kwI-txt: #1e1b4b;
}
body {margin:0;font-family:'Inter','Helvetica Neue',sans-serif;background:var(--kwI-bg);color:var(--kwI-txt);line-height:1.7;-webkit-font-smoothing:antialiased}
* {box-sizing:border-box}

.kwI-shell {min-height:100vh;background:var(--kwI-bg)}

/* 顶部水平导航 */
.kwI-topnav {background:rgba(255,255,255,.85);backdrop-filter:blur(20px);padding:18px 0;border-bottom:1px solid rgba(67,56,202,.08);position:sticky;top:0;z-index:100}
.kwI-topnav-inner {max-width:1320px;margin:0 auto;padding:0 40px;display:flex;align-items:center;justify-content:space-between}
.kwI-topnav .brand {font-size:22px;font-weight:800;color:var(--kwI-p);text-decoration:none;letter-spacing:-.5px;display:flex;align-items:center;gap:10px}
.kwI-topnav .brand::before {content:'';width:32px;height:32px;border-radius:8px;background:linear-gradient(135deg,var(--kwI-p),var(--kwI-s),var(--kwI-t))}
.kwI-topnav nav {display:flex;gap:2px}
.kwI-topnav nav a {color:var(--kwI-txt);text-decoration:none;padding:10px 18px;font-size:14px;font-weight:600;border-radius:8px}
.kwI-topnav nav a:hover, .kwI-topnav nav a.active {background:rgba(67,56,202,.08);color:var(--kwI-p)}
.kwI-topnav .cta {padding:11px 24px;background:linear-gradient(135deg,var(--kwI-p),var(--kwI-s));color:#fff;border-radius:8px;text-decoration:none;font-weight:700;font-size:13px}

/* Hero - 极光横带 */
.kwI-hero {position:relative;padding:100px 40px 90px;text-align:center;overflow:hidden}
.kwI-hero::before {content:'';position:absolute;top:-200px;left:0;right:0;height:600px;background:conic-gradient(from 90deg at 50% 50%,var(--kwI-p),var(--kwI-s),var(--kwI-t),var(--kwI-p));filter:blur(80px);opacity:.35;z-index:0}
.kwI-hero > * {position:relative;z-index:1}
.kwI-hero-tag {display:inline-block;padding:7px 18px;background:#fff;border:1px solid rgba(67,56,202,.15);color:var(--kwI-p);border-radius:24px;font-size:12px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:24px}
.kwI-hero-h {font-size:62px;font-weight:800;line-height:1.05;margin:0 0 22px;letter-spacing:-2px;background:linear-gradient(135deg,var(--kwI-p),var(--kwI-s));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.kwI-hero-sub {font-size:18px;opacity:.7;max-width:640px;margin:0 auto 36px;line-height:1.6}

/* Timeline */
.kwI-timeline-wrap {padding:80px 40px;max-width:1200px;margin:0 auto}
.kwI-timeline-h {font-size:34px;font-weight:800;text-align:center;margin:0 0 12px;letter-spacing:-1px;background:linear-gradient(135deg,var(--kwI-p),var(--kwI-s));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.kwI-timeline-sub {text-align:center;font-size:15px;opacity:.7;margin-bottom:48px}
.kwI-timeline {position:relative;padding:32px 0}
.kwI-timeline::before {content:'';position:absolute;left:50%;top:0;bottom:0;width:2px;background:linear-gradient(180deg,var(--kwI-p),var(--kwI-s),var(--kwI-t));transform:translateX(-50%)}
.kwI-tl-item {display:grid;grid-template-columns:1fr 60px 1fr;gap:24px;margin-bottom:32px;align-items:center}
.kwI-tl-card {background:#fff;padding:28px;border-radius:16px;border:1px solid rgba(67,56,202,.08);box-shadow:0 4px 16px rgba(67,56,202,.04)}
.kwI-tl-card.left {grid-column:1;text-align:right}
.kwI-tl-card.right {grid-column:3}
.kwI-tl-dot {grid-column:2;display:flex;justify-content:center}
.kwI-tl-dot i {width:18px;height:18px;border-radius:50%;background:#fff;border:4px solid var(--kwI-p);box-shadow:0 0 0 4px rgba(67,56,202,.1)}
.kwI-tl-num {font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--kwI-p);font-weight:700;margin-bottom:8px}
.kwI-tl-h {font-size:18px;font-weight:800;margin:0 0 8px;letter-spacing:-.5px}
.kwI-tl-p {font-size:13px;opacity:.7;line-height:1.6}

.kwI-sec {padding:60px 40px;max-width:1320px;margin:0 auto}
.kwI-sec-h {font-size:34px;font-weight:800;margin:0 0 12px;letter-spacing:-1px;background:linear-gradient(135deg,var(--kwI-p),var(--kwI-s));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.kwI-sec-sub {font-size:15px;opacity:.7;margin-bottom:36px}

.kwI-footer {background:linear-gradient(135deg,var(--kwI-p),var(--kwI-s));color:#fff;padding:50px 40px 28px}
.kwI-footer-grid {max-width:1320px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:36px}
.kwI-footer-h {font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1.5px;margin-bottom:18px}
.kwI-footer-link {display:block;color:rgba(255,255,255,.85);text-decoration:none;padding:4px 0;font-size:13px}
.kwI-footer-link:hover {color:#fff}
.kwI-footer-bottom {max-width:1320px;margin:0 auto;padding-top:24px;border-top:1px solid rgba(255,255,255,.18);text-align:center;font-size:12px;opacity:.75}