@font-face {
    font-family: "Rusong Noto Serif SC";
    src: url("/assets/rusong-noto-serif-sc-bold.woff2") format("woff2");
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    unicode-range: U+0020, U+0045, U+004F-0050, U+0052, U+006E-006F, U+007A, U+3001, U+4E00, U+4E0E, U+4E2A, U+4F5C, U+52A1, U+5355, U+53D1, U+53F0, U+54C1, U+5546, U+5982, U+5DE5, U+628A, U+653E, U+677E, U+8BA2, U+8D22, U+8D27, U+8FDB;
}

:root {
    color-scheme: light;
    --ink: #122033;
    --ink-soft: #536174;
    --line: #dce3ea;
    --line-strong: #bdc8d4;
    --paper: #f8f7f2;
    --surface: #ffffff;
    --blue: #1557b7;
    --blue-dark: #0d3f8e;
    --blue-pale: #eaf2ff;
    --pine: #173e45;
    --amber: #e9a52f;
    --success: #13795b;
    --radius: 16px;
    --shadow: 0 24px 70px rgba(24, 45, 72, 0.14);
    font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
    font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scrollbar-color: #9aabc0 var(--paper); }
body { margin: 0; color: var(--ink); background: var(--paper); line-height: 1.6; text-rendering: optimizeLegibility; }
::selection { color: #fff; background: var(--blue); }
a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 3px solid rgba(21, 87, 183, 0.35); outline-offset: 4px; }

.skip-link { position: fixed; top: 12px; left: 12px; z-index: 20; padding: 9px 14px; color: #fff; background: var(--blue-dark); border-radius: 8px; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.site-header { position: relative; z-index: 5; border-bottom: 1px solid rgba(189, 200, 212, 0.7); }
.header-inner, .hero, .trust-strip, .capabilities, .workflow, .final-cta, footer { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }
.header-inner { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-size: 18px; font-weight: 760; letter-spacing: -0.02em; text-decoration: none; }
.brand img { border-radius: 10px; }
.site-nav { display: flex; align-items: center; gap: 30px; font-size: 14px; font-weight: 650; }
.site-nav a { padding: 8px 0; color: var(--ink-soft); text-decoration: none; }
.site-nav a:hover { color: var(--blue); }
.site-nav .header-login { min-width: 72px; padding: 8px 18px; color: #fff; text-align: center; background: var(--blue); border-radius: 9px; }
.site-nav .header-login:hover { color: #fff; background: var(--blue-dark); }

.hero { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(540px, 1.1fr); align-items: center; gap: clamp(48px, 7vw, 92px); min-height: 680px; padding-block: 76px 90px; }
.hero-copy h1 { display: grid; gap: 18px; margin: 0; font-family: "Rusong Noto Serif SC", "Songti SC", STSong, serif; font-weight: 700; letter-spacing: -0.035em; }
.hero-brand-name { color: var(--blue); font-size: clamp(48px, 5vw, 70px); line-height: 1; }
.hero-statement { color: var(--ink); font-size: clamp(32px, 3.2vw, 46px); line-height: 1.2; }
.hero-description { max-width: 560px; margin: 28px 0 0; color: var(--ink-soft); font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 11px 22px; border: 1px solid transparent; border-radius: 10px; font-size: 15px; font-weight: 720; text-decoration: none; transition: transform 180ms ease, background-color 180ms ease, border-color 180ms ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: var(--blue); box-shadow: 0 10px 24px rgba(21, 87, 183, 0.2); }
.button-primary:hover { background: var(--blue-dark); }
.button-secondary { color: var(--ink); background: transparent; border-color: var(--line-strong); }
.button-secondary:hover { border-color: var(--blue); }
.register-link { margin: 16px 0 0; color: var(--ink-soft); font-size: 14px; }
.register-link a { color: var(--blue); font-weight: 700; text-underline-offset: 3px; }

.workspace-proof { overflow: hidden; background: #fdfefe; border-radius: var(--radius); box-shadow: var(--shadow); transform: rotate(0.5deg); }
.proof-toolbar { min-height: 58px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 0 20px; border-bottom: 1px solid var(--line); }
.proof-brand { display: flex; align-items: center; gap: 9px; font-size: 13px; }
.proof-mark { width: 11px; height: 11px; background: var(--amber); border-radius: 3px 50% 50%; transform: rotate(45deg); }
.demo-label { padding: 4px 9px; color: #65430a; background: #fff4d8; border: 1px solid #efce85; border-radius: 999px; font-size: 12px; font-weight: 700; }
.proof-layout { display: grid; grid-template-columns: 55px 1fr; min-height: 430px; }
.proof-rail { display: flex; flex-direction: column; align-items: center; gap: 20px; padding-top: 28px; background: var(--pine); }
.rail-dot { width: 18px; height: 18px; border: 1px solid rgba(255,255,255,0.4); border-radius: 5px; }
.rail-dot.is-active { background: var(--amber); border-color: var(--amber); }
.proof-main { min-width: 0; padding: 28px; }
.proof-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.proof-heading div { display: grid; gap: 2px; }
.proof-heading div span { color: var(--ink-soft); font-size: 12px; }
.proof-heading div strong { font-size: 18px; }
.sync-state { display: inline-flex; align-items: center; gap: 6px; color: var(--success); font-size: 12px; font-weight: 700; }
.sync-state i { width: 7px; height: 7px; background: var(--success); border-radius: 50%; box-shadow: 0 0 0 5px rgba(19,121,91,0.1); }
.metric-strip { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 24px; border-block: 1px solid var(--line); }
.metric-strip > div { position: relative; display: grid; padding: 18px 16px; border-right: 1px solid var(--line); }
.metric-strip > div:first-child { padding-left: 0; }
.metric-strip > div:last-child { border-right: 0; }
.metric-strip span { color: var(--ink-soft); font-size: 12px; }
.metric-strip strong { font-size: 26px; line-height: 1.3; }
.metric-strip small { position: absolute; right: 12px; bottom: 18px; color: #8491a2; font-size: 11px; }
.workflow-board { position: relative; display: grid; gap: 12px; margin-top: 24px; }
.flow-line { position: absolute; top: 42px; bottom: 42px; left: 20px; width: 1px; overflow: hidden; background: var(--line); }
.flow-line span { position: absolute; inset: -70% 0 auto; height: 70%; background: var(--blue); animation: signal 3.4s ease-in-out infinite; }
.flow-row { position: relative; display: grid; grid-template-columns: 42px minmax(0, 1fr) auto; align-items: center; gap: 13px; min-height: 72px; padding: 10px 14px 10px 0; background: var(--surface); border: 1px solid var(--line); border-radius: 11px; }
.flow-icon { z-index: 1; width: 40px; height: 40px; display: grid; place-items: center; color: var(--blue); background: var(--blue-pale); border: 5px solid var(--surface); border-radius: 50%; }
.flow-icon svg, .capability-list svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.flow-row div { min-width: 0; display: grid; }
.flow-row div strong { font-size: 13px; }
.flow-row div span { overflow: hidden; color: var(--ink-soft); font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.flow-row b { color: var(--blue); font-size: 11px; }
@keyframes signal { 0% { transform: translateY(0); } 55%, 100% { transform: translateY(245%); } }

.trust-strip { display: grid; grid-template-columns: repeat(3, 1fr); border-block: 1px solid var(--line-strong); }
.trust-strip p { display: grid; gap: 2px; margin: 0; padding: 25px 30px; border-right: 1px solid var(--line); }
.trust-strip p:first-child { padding-left: 0; }
.trust-strip p:last-child { border-right: 0; }
.trust-strip strong { font-size: 15px; }
.trust-strip span { color: var(--ink-soft); font-size: 13px; }
.capabilities { padding-block: 120px 110px; }
.section-heading { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(300px, 0.65fr); justify-content: space-between; gap: 70px; align-items: end; margin-bottom: 50px; }
.section-heading h2, .workflow h2, .final-cta h2 { margin: 0; font-size: clamp(30px, 3.4vw, 48px); line-height: 1.18; letter-spacing: -0.04em; }
.section-heading p { margin: 0; color: var(--ink-soft); font-size: 16px; }
.capability-list { border-top: 1px solid var(--line-strong); }
.capability-list article { display: grid; grid-template-columns: minmax(0, 1fr) 44px; align-items: center; gap: 24px; min-height: 126px; padding: 22px 16px 22px 0; border-bottom: 1px solid var(--line); transition: background-color 180ms ease; }
.capability-list article:hover { background: rgba(255,255,255,0.52); }
.capability-list article > div { display: grid; grid-template-columns: minmax(170px, 0.46fr) minmax(260px, 1fr); align-items: center; gap: 40px; }
.capability-list h3 { margin: 0; font-size: 20px; }
.capability-list p { margin: 0; color: var(--ink-soft); font-size: 14px; }
.capability-list article > svg { justify-self: end; width: 25px; height: 25px; color: var(--blue); }

.workflow { display: grid; grid-template-columns: minmax(0, 0.78fr) minmax(420px, 0.9fr); gap: 100px; padding: 78px; color: #fff; background: var(--pine); border-radius: var(--radius); }
.workflow-copy > p { margin: 24px 0 26px; color: rgba(255,255,255,0.72); }
.workflow-copy > a { color: #fff; font-weight: 720; text-underline-offset: 5px; }
.workflow-copy > a span { color: var(--amber); }
.workflow-steps { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.workflow-steps li { display: grid; grid-template-columns: 48px 1fr; gap: 18px; padding: 22px 0; border-bottom: 1px solid rgba(255,255,255,0.16); }
.workflow-steps li:last-child { border-bottom: 0; }
.workflow-steps li > span { width: 34px; height: 34px; display: grid; place-items: center; color: var(--pine); background: var(--amber); border-radius: 50%; font-size: 12px; font-weight: 800; }
.workflow-steps strong { font-size: 16px; }
.workflow-steps p { margin: 3px 0 0; color: rgba(255,255,255,0.66); font-size: 13px; }
.final-cta { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding-block: 116px; }
.final-cta h2 { font-size: clamp(28px, 3vw, 42px); }
.final-cta p { margin: 10px 0 0; color: var(--ink-soft); }
footer { min-height: 92px; display: flex; align-items: center; justify-content: space-between; gap: 30px; border-top: 1px solid var(--line-strong); color: var(--ink-soft); }
.footer-brand { color: var(--ink); font-size: 15px; }
footer p { margin: 0; font-size: 12px; }

@media (max-width: 980px) {
    .hero { grid-template-columns: 1fr; min-height: 0; }
    .hero-copy { max-width: 720px; }
    .workspace-proof { width: min(100%, 680px); transform: none; }
    .workflow { grid-template-columns: 1fr; gap: 42px; padding: 58px; }
}

@media (max-width: 680px) {
    .header-inner, .hero, .trust-strip, .capabilities, .workflow, .final-cta, footer { width: min(100% - 32px, 1180px); }
    .header-inner { min-height: 66px; }
    .brand { font-size: 16px; }
    .site-nav { gap: 12px; }
    .site-nav > a:not(.header-login) { display: none; }
    .site-nav .header-login { min-width: 64px; padding-inline: 14px; }
    .hero { gap: 50px; padding-block: 56px 68px; }
    .hero-brand-name { font-size: clamp(44px, 13vw, 54px); }
    .hero-statement { font-size: clamp(32px, 9.7vw, 40px); }
    .hero-statement br { display: none; }
    .hero-description { margin-top: 22px; font-size: 15px; }
    .hero-actions { display: grid; grid-template-columns: 1fr; }
    .button { width: 100%; }
    .proof-toolbar { align-items: flex-start; flex-direction: column; gap: 7px; padding-block: 14px; }
    .proof-layout { grid-template-columns: 38px 1fr; min-height: 0; }
    .proof-rail { gap: 15px; }
    .rail-dot { width: 14px; height: 14px; }
    .proof-main { padding: 20px 14px; }
    .proof-heading { align-items: flex-start; flex-direction: column; }
    .metric-strip { grid-template-columns: 1fr; }
    .metric-strip > div, .metric-strip > div:first-child { grid-template-columns: 1fr auto; align-items: center; padding: 11px 0; border-right: 0; border-bottom: 1px solid var(--line); }
    .metric-strip > div:last-child { border-bottom: 0; }
    .metric-strip strong { grid-column: 2; grid-row: 1 / span 2; font-size: 21px; }
    .metric-strip small { position: static; }
    .flow-row { grid-template-columns: 36px minmax(0, 1fr); padding-right: 8px; }
    .flow-icon { width: 36px; height: 36px; }
    .flow-row b { grid-column: 2; }
    .trust-strip { grid-template-columns: 1fr; }
    .trust-strip p, .trust-strip p:first-child { padding: 18px 0; border-right: 0; border-bottom: 1px solid var(--line); }
    .trust-strip p:last-child { border-bottom: 0; }
    .capabilities { padding-block: 82px 74px; }
    .section-heading { grid-template-columns: 1fr; gap: 18px; margin-bottom: 36px; }
    .capability-list article { grid-template-columns: minmax(0, 1fr) 30px; gap: 12px; min-height: 0; padding-block: 24px; }
    .capability-list article > div { grid-template-columns: 1fr; gap: 7px; }
    .capability-list article:hover { padding-left: 0; }
    .capability-list h3 { font-size: 17px; }
    .capability-list p { font-size: 13px; }
    .workflow { gap: 34px; padding: 42px 24px; }
    .final-cta { align-items: stretch; flex-direction: column; padding-block: 80px; }
    footer { align-items: flex-start; flex-direction: column; justify-content: center; padding-block: 24px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
    .button:hover { transform: none; }
}