:root {
    --ink: #18202d;
    --muted: #687080;
    --paper: #fbfcfe;
    --line: #dfe3e9;
    --primary: #5a46e8;
    --primary-deep: #3928b9;
    --coral: #ff765f;
    --mint: #61c9ad;
    --blue: #4d95e8;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    overflow-x: hidden;
    color: var(--ink);
    background: var(--paper);
    font-family: "SF Pro SC", "PingFang SC", "Microsoft Yahei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
svg { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.svg-defs { position: absolute; width: 0; height: 0; overflow: hidden; }
.site-header {
    height: 76px;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(223, 227, 233, .75);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 760; }
.brand-mark {
    width: 34px; height: 34px; display: grid; place-items: center;
    color: #fff; background: var(--primary); border-radius: 8px;
}
.brand-mark svg { width: 20px; height: 20px; }
nav { display: flex; gap: 34px; color: #4d5564; font-size: 14px; }
nav a:hover, .text-link:hover { color: var(--primary); }
.header-actions { display: flex; align-items: center; gap: 20px; font-size: 14px; }
.button {
    min-height: 43px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    padding: 0 20px;
    border: 1px solid transparent;
    border-radius: 7px;
    font-size: 14px;
    font-weight: 650;
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button-dark { color: #fff; background: var(--ink); }
.button-primary { color: #fff; background: var(--primary); box-shadow: 0 12px 24px rgba(90, 70, 232, .2); }
.button-primary:hover { background: var(--primary-deep); }
.button-quiet { color: var(--ink); border-color: var(--line); background: #fff; }
.button svg { width: 17px; height: 17px; }

.hero {
    max-width: 1240px;
    min-height: calc(100vh - 116px);
    margin: 0 auto;
    padding: 68px 24px 52px;
    display: grid;
    grid-template-columns: minmax(420px, .84fr) minmax(560px, 1.16fr);
    gap: 62px;
    align-items: center;
}
.eyebrow {
    width: max-content;
    display: flex; align-items: center; gap: 8px;
    color: var(--primary); font-size: 13px; font-weight: 700;
}
.eyebrow svg { width: 17px; height: 17px; }
.hero h1 {
    max-width: 580px;
    margin: 22px 0;
    font-size: clamp(46px, 5.1vw, 70px);
    line-height: 1.08;
    letter-spacing: 0;
    font-weight: 820;
}
.hero h1 span { display: block; color: var(--primary); }
.hero-copy > p { max-width: 540px; margin: 0; color: var(--muted); font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; gap: 12px; margin-top: 34px; }
.trust-row { display: flex; gap: 24px; margin-top: 42px; color: #848b98; font-size: 12px; }
.trust-row span { padding-left: 12px; border-left: 2px solid var(--line); }
.trust-row b { color: var(--ink); }
.hero-visual { position: relative; min-width: 0; }
.hero-visual::before {
    content: ""; position: absolute; inset: -38px -80px -42px -32px;
    z-index: -1; background: #eef1fb; border-radius: 50% 0 0 50%;
}
.preview-window {
    overflow: hidden;
    background: #fff;
    border: 1px solid #d8dce5;
    border-radius: 8px;
    box-shadow: 0 30px 70px rgba(33, 38, 58, .16);
    transform: perspective(1400px) rotateY(-3deg) rotateX(1deg);
}
.preview-top {
    height: 48px; padding: 0 16px;
    display: flex; align-items: center; justify-content: space-between;
    background: #f8f9fb; border-bottom: 1px solid #e2e5ea;
    font-size: 11px; font-weight: 700;
}
.preview-brand { display: flex; align-items: center; gap: 7px; }
.preview-brand span { width: 17px; height: 17px; border-radius: 5px; background: var(--primary); }
.preview-dots { display: flex; gap: 5px; }
.preview-dots i { width: 6px; height: 6px; border-radius: 50%; background: #c9ced7; }
.preview-body { min-height: 408px; display: grid; grid-template-columns: 126px 1fr 150px; }
.preview-books, .preview-ai { padding: 19px 13px; background: #f7f8fa; font-size: 10px; }
.preview-books { display: flex; flex-direction: column; gap: 7px; border-right: 1px solid #e1e4e9; }
.preview-books small { color: #8b919d; margin-bottom: 8px; }
.preview-books strong { margin-top: 9px; font-size: 10px; }
.preview-books span { padding: 7px; color: #777f8c; border-radius: 4px; }
.preview-books .active { color: var(--primary); background: #eae8ff; }
.preview-paper { padding: 38px 32px; background: #fff; }
.preview-paper small { color: #9aa0aa; }
.preview-paper h2 { margin: 10px 0 28px; font-family: Georgia, "Songti SC", serif; font-size: 24px; }
.preview-paper p, .preview-paper blockquote { margin: 0 0 15px; color: #4f5662; font-family: Georgia, "Songti SC", serif; font-size: 11px; line-height: 2; }
.preview-paper blockquote { padding-left: 10px; color: var(--primary); border-left: 2px solid #b9b0ff; }
.cursor-line { height: 1px; margin-top: 24px; background: #eceef1; }
.cursor-line span { display: block; width: 2px; height: 14px; background: var(--primary); transform: translateY(-13px); animation: blink 1.1s infinite; }
@keyframes blink { 50% { opacity: 0; } }
.preview-ai { border-left: 1px solid #e1e4e9; background: #fafbfc; }
.ai-label { display: flex; align-items: center; gap: 5px; font-weight: 700; }
.ai-label svg { color: var(--primary); }
.model-pill { display: block; margin: 15px 0; padding: 7px; border: 1px solid #e0e3e9; border-radius: 5px; background: #fff; }
.prompt-block { min-height: 118px; padding: 10px; color: #727987; line-height: 1.7; border: 1px solid #e0e3e9; border-radius: 5px; background: #fff; }
.generate-bar { margin-top: 12px; padding: 8px; color: #fff; text-align: center; border-radius: 5px; background: var(--primary); }

.capabilities { padding: 96px 24px 112px; border-top: 1px solid var(--line); background: #fff; }
.section-heading { max-width: 1192px; margin: 0 auto 44px; }
.section-heading > span, .workflow-copy > span { color: var(--primary); font-size: 12px; font-weight: 750; }
.section-heading h2, .workflow h2 { margin: 10px 0; font-size: 36px; letter-spacing: 0; }
.section-heading p { color: var(--muted); }
.feature-grid { max-width: 1192px; margin: auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.feature-grid article { min-height: 300px; padding: 34px; background: #fff; }
.feature-icon { width: 46px; height: 46px; margin-bottom: 44px; display: grid; place-items: center; color: #fff; border-radius: 7px; }
.feature-icon svg { width: 23px; height: 23px; }
.feature-icon.coral { background: var(--coral); }
.feature-icon.mint { background: var(--mint); }
.feature-icon.blue { background: var(--blue); }
.feature-grid article > span { color: #9096a1; font-size: 11px; }
.feature-grid h3 { margin: 11px 0; font-size: 21px; }
.feature-grid p { margin: 0; color: var(--muted); line-height: 1.8; font-size: 14px; }

.workflow {
    max-width: 1192px;
    margin: 104px auto;
    padding: 58px;
    color: #fff;
    display: grid;
    grid-template-columns: 1fr 1.25fr;
    gap: 30px 70px;
    background: var(--ink);
    border-radius: 8px;
}
.workflow-copy > span { color: #a89cff; }
.workflow h2 { max-width: 400px; margin-bottom: 0; }
.workflow ol { grid-row: span 2; margin: 0; padding: 0; list-style: none; }
.workflow li { display: grid; grid-template-columns: 38px 115px 1fr; align-items: center; padding: 21px 0; border-bottom: 1px solid rgba(255,255,255,.14); }
.workflow li b { color: #9a8df3; font-size: 12px; }
.workflow li strong { font-size: 15px; }
.workflow li span { color: #abb1bb; font-size: 13px; }
.workflow .button { justify-self: start; align-self: end; }

footer {
    max-width: 1192px;
    margin: auto;
    padding: 34px 0;
    display: flex; align-items: center; gap: 28px;
    color: #8a909c; border-top: 1px solid var(--line); font-size: 12px;
}
footer p { flex: 1; }

@media (max-width: 1020px) {
    .hero { grid-template-columns: 1fr; padding-top: 68px; }
    .hero-copy { max-width: 720px; }
    .hero-visual::before { inset: -25px -24px -35px; border-radius: 20px; }
    .preview-window { transform: none; }
}
@media (max-width: 720px) {
    .site-header { height: 64px; }
    nav { display: none; }
    .header-actions .text-link { display: none; }
    .brand { font-size: 17px; }
    .brand-mark { width: 31px; height: 31px; }
    .button { min-height: 40px; padding: 0 15px; }
    .hero { min-height: 0; padding: 58px 20px 70px; gap: 58px; }
    .hero h1 { font-size: 43px; }
    .hero-copy > p { font-size: 15px; }
    .trust-row { gap: 10px; flex-wrap: wrap; }
    .preview-body { grid-template-columns: 84px 1fr; min-height: 340px; }
    .preview-books { padding: 13px 8px; }
    .preview-ai { display: none; }
    .preview-paper { padding: 28px 18px; }
    .feature-grid { grid-template-columns: 1fr; }
    .capabilities { padding: 70px 20px; }
    .section-heading h2, .workflow h2 { font-size: 29px; }
    .workflow { margin: 70px 20px; padding: 35px 24px; grid-template-columns: 1fr; }
    .workflow ol { grid-row: auto; }
    .workflow li { grid-template-columns: 32px 100px 1fr; }
    footer { margin: 0 20px; flex-wrap: wrap; }
    footer p { order: 3; flex-basis: 100%; }
}