:root {
  --bg: #0f1d33;
  --bg-2: #13253f;
  --panel: rgba(38, 64, 102, .45);
  --line: rgba(170, 206, 245, .16);
  --text: #e8f1fc;
  --muted: #9db2cc;
  --accent: #38bdf8;
  --accent-2: #818cf8;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { color: var(--text); background: var(--bg); font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
.wrap { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.wrap.narrow { width: min(820px, calc(100% - 48px)); }

/* 导航 */
.nav { position: fixed; z-index: 50; top: 0; right: 0; left: 0; transition: background .2s, border-color .2s; border-bottom: 1px solid transparent; }
.nav.scrolled { border-bottom-color: var(--line); background: rgba(15, 29, 51, .86); backdrop-filter: blur(14px); }
.nav-inner { display: flex; height: 68px; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 17px; font-weight: 700; }
.brand b { margin-left: 2px; color: var(--accent); }
.brand-mark { display: grid; width: 32px; height: 32px; place-items: center; color: #fff; border-radius: 10px; background: linear-gradient(135deg, #3b82f6, #8b5cf6); font-size: 16px; }
.brand.small .brand-mark { width: 26px; height: 26px; font-size: 13px; }
.nav-links { display: flex; gap: 22px; margin-left: auto; color: var(--muted); font-size: 14px; }
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; gap: 10px; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 9px 18px; border: 1px solid transparent; border-radius: 10px; font-size: 14px; font-weight: 600; transition: transform .15s, box-shadow .15s, background .15s; }
.btn:hover { transform: translateY(-1px); }
.btn.primary { color: #fff; background: linear-gradient(135deg, #2563eb, #7c3aed); box-shadow: 0 8px 24px rgba(59, 130, 246, .28); }
.btn.ghost { border-color: rgba(170, 206, 245, .3); background: rgba(255, 255, 255, .04); }
.btn.lg { padding: 13px 26px; font-size: 15px; }

/* 首屏 */
.hero { position: relative; overflow: hidden; padding: 140px 0 90px; }
.hero-bg { position: absolute; inset: 0; background: radial-gradient(900px 500px at 78% 30%, rgba(129, 140, 248, .18), transparent 60%), radial-gradient(700px 500px at 10% 10%, rgba(56, 189, 248, .14), transparent 60%); }
.hero-inner { position: relative; display: grid; grid-template-columns: 1.05fr 1fr; align-items: center; gap: 48px; }
.kicker { display: inline-block; margin-bottom: 14px; padding: 4px 12px; color: #a5d8ff; border: 1px solid rgba(56, 189, 248, .35); border-radius: 999px; background: rgba(56, 189, 248, .08); font-size: 13px; letter-spacing: .04em; }
.hero h1 { font-size: clamp(38px, 5.2vw, 62px); line-height: 1.12; letter-spacing: -.01em; }
.hero h1 em { font-style: normal; background: linear-gradient(90deg, #67e8f9, #a5b4fc); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-copy > p { max-width: 540px; margin-top: 22px; color: var(--muted); font-size: 17px; line-height: 1.85; }
.hero-copy > p b { color: var(--text); font-weight: 600; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-actions.center { justify-content: center; }
.hero-points { display: flex; flex-direction: column; gap: 8px; margin-top: 28px; color: #c3d4e8; font-size: 14px; list-style: none; }
.hero-points li::before { margin-right: 8px; color: #34d399; content: '✓'; font-weight: 700; }

/* 闭环仪表（与系统登录页一致）：刻度环 + 玻璃核心 + 辐射线 + 扫描光，单一冷色调 */
.hero-visual { display: flex; flex-direction: column; align-items: center; justify-content: center; }
.loop { --r: 150px; --label-r: 202px; position: relative; width: 500px; max-width: 100%; height: 440px; }
.loop > * { position: absolute; top: 50%; left: 50%; }
.loop-glow { width: 400px; height: 400px; border-radius: 50%; background: radial-gradient(circle, rgba(56, 189, 248, .16), rgba(99, 102, 241, .07) 45%, transparent 70%); transform: translate(-50%, -50%); }
.loop-ticks { width: calc(var(--r) * 2 + 30px); height: calc(var(--r) * 2 + 30px); border-radius: 50%; background: repeating-conic-gradient(from -.3deg, rgba(148, 197, 255, .4) 0 .6deg, transparent .6deg 6deg); -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 6px), #000 calc(100% - 6px)); mask: radial-gradient(farthest-side, transparent calc(100% - 6px), #000 calc(100% - 6px)); opacity: .55; transform: translate(-50%, -50%); }
.loop-ring { width: calc(var(--r) * 2); height: calc(var(--r) * 2); border: 1px solid rgba(125, 186, 245, .2); border-radius: 50%; transform: translate(-50%, -50%); }
.loop-ring.is-inner { width: calc(var(--r) * 1.18); height: calc(var(--r) * 1.18); border-color: rgba(129, 140, 248, .14); }
.loop-sweep { width: calc(var(--r) * 2 + 2px); height: calc(var(--r) * 2 + 2px); border-radius: 50%; background: conic-gradient(from 0deg, transparent 0 290deg, rgba(103, 232, 249, .05) 300deg, rgba(103, 232, 249, .95) 359deg, transparent 360deg); -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 2px)); mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 2px)); filter: drop-shadow(0 0 6px rgba(103, 232, 249, .7)); transform: translate(-50%, -50%) rotate(var(--sweep, 0deg)); transition: transform 2.2s cubic-bezier(.45, .05, .25, 1); }
.loop-spoke { width: calc(var(--r) - 64px); height: 1px; background: linear-gradient(90deg, rgba(125, 186, 245, 0), rgba(125, 186, 245, .16)); transform-origin: 0 50%; transform: rotate(calc(45deg * var(--i) - 90deg)) translateX(62px); transition: background .6s; }
.loop-spoke.active { height: 1.5px; background: linear-gradient(90deg, rgba(103, 232, 249, 0), rgba(103, 232, 249, .85)); box-shadow: 0 0 8px rgba(103, 232, 249, .5); }
.loop-core { display: flex; width: 112px; height: 112px; flex-direction: column; align-items: center; justify-content: center; gap: 8px; color: #e6fbff; border: 1px solid rgba(165, 243, 252, .32); border-radius: 36px; background: linear-gradient(150deg, rgba(56, 189, 248, .26), rgba(79, 70, 229, .22) 60%, rgba(30, 41, 82, .5)); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .22), inset 0 -14px 28px rgba(15, 23, 42, .35), 0 0 0 10px rgba(56, 189, 248, .04), 0 22px 54px rgba(56, 189, 248, .22); backdrop-filter: blur(10px); transform: translate(-50%, -50%); }
.loop-core::before { position: absolute; inset: -14px; border: 1px solid rgba(103, 232, 249, .14); border-radius: 46px; content: ''; animation: breathe 3.4s ease-in-out infinite; }
.loop-core small { color: rgba(186, 230, 253, .75); font-family: 'SF Mono', ui-monospace, monospace; font-size: 9.5px; letter-spacing: .22em; }
@keyframes breathe { 0%, 100% { opacity: .5; transform: scale(1); } 50% { opacity: 1; transform: scale(1.04); } }
.loop-dot { width: 8px; height: 8px; border-radius: 50%; background: #9fdcff; box-shadow: 0 0 0 3px rgba(103, 232, 249, .08), 0 0 8px rgba(103, 232, 249, .45); transform: rotate(calc(45deg * var(--i) - 90deg)) translate(var(--r)) rotate(calc(90deg - 45deg * var(--i))) translate(-50%, -50%); transition: background .5s, box-shadow .5s; }
.loop-dot.active { background: #fff; box-shadow: 0 0 0 4px rgba(103, 232, 249, .22), 0 0 0 10px rgba(103, 232, 249, .08), 0 0 20px rgba(103, 232, 249, .9); }
.loop-label { display: flex; align-items: baseline; gap: 7px; color: rgba(186, 214, 240, .52); font-size: 14px; letter-spacing: .04em; white-space: nowrap; transform: rotate(calc(45deg * var(--i) - 90deg)) translate(var(--label-r)) rotate(calc(90deg - 45deg * var(--i))) translate(-50%, -50%); transition: color .5s, text-shadow .5s; }
.loop-label em { color: rgba(103, 232, 249, .45); font-family: 'SF Mono', ui-monospace, monospace; font-size: 10.5px; font-style: normal; letter-spacing: .08em; transition: color .5s; }
.loop-label.active { color: #fff; text-shadow: 0 0 14px rgba(103, 232, 249, .55); }
.loop-label.active em { color: #67e8f9; }
.loop-caption { display: flex; width: min(100%, 440px); min-height: 38px; align-items: baseline; gap: 12px; padding-top: 14px; border-top: 1px solid rgba(125, 186, 245, .14); opacity: 0; transform: translateY(6px); transition: opacity .35s ease, transform .35s ease; }
.loop-caption.show { opacity: 1; transform: none; }
.loop-caption em { color: #67e8f9; font-family: 'SF Mono', ui-monospace, monospace; font-size: 11px; font-style: normal; letter-spacing: .14em; }
.loop-caption strong { color: #eef7ff; font-size: 15px; font-weight: 600; white-space: nowrap; }
.loop-caption span { color: var(--muted); font-size: 13.5px; }

/* 区块 */
.block { padding: 96px 0; }
.block.soft { background: var(--bg-2); }
.block.dark { background: linear-gradient(180deg, #0b1628, #101f37); }
.sec-head { max-width: 760px; margin: 0 auto 48px; text-align: center; }
.sec-head h2, .fit h2, .cta h2 { font-size: clamp(26px, 3.2vw, 38px); line-height: 1.3; }
.grid { display: grid; gap: 18px; }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g5 { grid-template-columns: repeat(5, 1fr); }
.card { padding: 26px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); transition: transform .2s, border-color .2s; }
.card:hover { transform: translateY(-3px); border-color: rgba(56, 189, 248, .4); }
.card.dark { background: rgba(30, 52, 86, .5); }
.card .icon { display: inline-grid; width: 38px; height: 38px; margin-bottom: 16px; place-items: center; color: #67e8f9; border: 1px solid rgba(103, 232, 249, .3); border-radius: 11px; background: linear-gradient(150deg, rgba(56, 189, 248, .14), rgba(99, 102, 241, .08)); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08); font-family: 'SF Mono', ui-monospace, monospace; font-size: 12px; letter-spacing: .08em; }
.card h3, .dept h3, .step h3 { margin-bottom: 8px; font-size: 18px; }
.card p, .dept p, .step p { color: var(--muted); font-size: 14.5px; line-height: 1.8; }
.note { margin-top: 26px; color: var(--muted); font-size: 14px; text-align: center; }

/* 对比 */
.compare { overflow: hidden; border: 1px solid var(--line); border-radius: 16px; }
.compare-row { display: grid; grid-template-columns: 110px 1fr 1fr 1.6fr; border-top: 1px solid var(--line); }
.compare-row:first-child { border-top: 0; }
.compare-row span { padding: 16px 18px; color: var(--muted); font-size: 14.5px; }
.compare-row span:first-child { color: var(--text); font-weight: 600; }
.compare-row .us { color: #e0f2fe; background: rgba(56, 189, 248, .08); }
.compare-row.head span { color: var(--text); background: rgba(38, 64, 102, .6); font-weight: 700; }
.compare-row.head .us { color: #67e8f9; background: rgba(56, 189, 248, .16); }

/* 全链路 */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; list-style: none; counter-reset: step; }
.step { position: relative; padding: 24px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
.step b { display: block; margin-bottom: 10px; color: var(--accent); font-family: 'DIN Alternate', 'SF Mono', monospace; font-size: 26px; }
.loop-back { margin-top: 28px; color: #67e8f9; font-size: 15px; text-align: center; }

/* AI 员工 */
.dept { padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
.dept-tag { display: inline-block; margin-bottom: 12px; padding: 2px 10px; color: #67e8f9; border: 1px solid rgba(103, 232, 249, .35); border-radius: 999px; background: rgba(56, 189, 248, .08); font-size: 12px; letter-spacing: .06em; }

/* 老板的一天 */
.timeline { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; }
.tl { position: relative; padding: 28px 18px 0; border-top: 2px solid rgba(56, 189, 248, .3); }
.tl::before { position: absolute; top: -7px; left: 18px; width: 12px; height: 12px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); content: ''; }
.tl b { display: block; margin-bottom: 6px; color: #fff; font-size: 18px; }
.tl p { color: var(--muted); font-size: 14px; line-height: 1.8; }

/* 适用 */
.fit { display: grid; grid-template-columns: 1.2fr 1fr; align-items: center; gap: 48px; }
.fit p { margin-top: 16px; color: var(--muted); font-size: 15.5px; line-height: 1.9; }
.fit p b { color: var(--text); }
.fit-list { display: flex; flex-direction: column; gap: 12px; list-style: none; }
.fit-list li { padding: 14px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); font-size: 15px; }
.fit-list li::before { margin-right: 10px; color: #34d399; content: '✓'; font-weight: 700; }

/* FAQ */
.faq { margin-bottom: 12px; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); }
.faq summary { padding: 18px 22px; cursor: pointer; font-size: 16px; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { float: right; color: var(--accent); content: '+'; font-size: 20px; line-height: 1; }
.faq[open] summary::after { content: '−'; }
.faq p { padding: 0 22px 20px; color: var(--muted); font-size: 15px; line-height: 1.9; }

/* 行动号召 */
.cta { padding: 100px 0; background: radial-gradient(700px 300px at 50% 0, rgba(129, 140, 248, .25), transparent 70%), #0b1628; text-align: center; }
.cta p { margin-top: 14px; color: var(--muted); font-size: 16px; }
.footer { padding: 28px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }

/* 进入视口时淡入 */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.shown { opacity: 1; transform: none; }

@media (max-width: 1080px) {
  .nav-links { display: none; }
  .nav-actions { margin-left: auto; }
  .hero-inner, .fit { grid-template-columns: 1fr; }
  .g3, .steps { grid-template-columns: repeat(2, 1fr); }
  .g5 { grid-template-columns: repeat(3, 1fr); }
  .timeline { grid-template-columns: 1fr; gap: 18px; }
  .tl { padding: 0 0 0 26px; border-top: 0; border-left: 2px solid rgba(56, 189, 248, .3); }
  .tl::before { top: 4px; left: -7px; }
}
@media (max-width: 640px) {
  .hero { padding-top: 110px; }
  .loop { --r: 104px; --label-r: 142px; height: 330px; }
  .g3, .g5, .steps { grid-template-columns: 1fr; }
  .compare-row { grid-template-columns: 70px 1fr; }
  .compare-row span:nth-child(2), .compare-row span:nth-child(3) { display: none; }
  .nav-actions .ghost { display: none; }
}
@media (prefers-reduced-motion: reduce) { .loop-sweep, .loop-core::before { animation: none; transition: none; } .reveal { opacity: 1; transform: none; } }