/* ============ 设计令牌 ============ */
:root {
    --indigo: #4f46e5;
    --indigo-600: #4338ca;
    --violet: #7c3aed;
    --cyan: #06b6d4;
    --cyan-400: #22d3ee;
    --ink: #0f172a;
    --ink-2: #334155;
    --muted: #64748b;
    --line: #e6e9f5;
    --bg: #ffffff;
    --bg-alt: #f7f8fc;
    --grad: linear-gradient(120deg, #6366f1 0%, #7c3aed 45%, #22d3ee 100%);
    --shadow-sm: 0 1px 3px rgba(15,23,42,.08);
    --shadow: 0 10px 30px rgba(79,70,229,.12);
    --shadow-lg: 0 24px 60px rgba(79,70,229,.18);
    --radius: 18px;
    --radius-sm: 12px;
    --maxw: 1180px;
    --ease: cubic-bezier(.22,.61,.36,1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ============ 按钮 ============ */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: 8px; padding: 11px 20px; border-radius: 999px;
    font-weight: 600; font-size: 15px; cursor: pointer;
    border: 1px solid transparent; transition: all .25s var(--ease);
    white-space: nowrap;
}
.btn--primary { background: var(--grad); color: #fff; box-shadow: var(--shadow); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--indigo); color: var(--indigo); }
.btn--lg { padding: 14px 28px; font-size: 16px; }
.btn--block { width: 100%; }

/* ============ 导航 ============ */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 50;
    transition: all .3s var(--ease);
}
.nav__inner {
    max-width: var(--maxw); margin: 0 auto; padding: 16px 24px;
    display: flex; align-items: center; justify-content: space-between;
}
.nav.scrolled {
    background: rgba(255,255,255,.82);
    backdrop-filter: blur(14px);
    box-shadow: 0 1px 0 rgba(15,23,42,.06);
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 20px; }
.brand__mark {
    width: 34px; height: 34px; border-radius: 10px; background: var(--grad);
    display: grid; place-items: center; color: #fff; font-size: 15px; font-weight: 800;
}
.nav__links { display: flex; gap: 30px; }
.nav__links a { color: var(--ink-2); font-weight: 500; font-size: 15px; position: relative; }
.nav__links a::after {
    content: ""; position: absolute; left: 0; bottom: -6px; height: 2px; width: 0;
    background: var(--grad); transition: width .25s var(--ease);
}
.nav__links a:hover { color: var(--ink); }
.nav__links a:hover::after { width: 100%; }
.nav__actions { display: flex; gap: 12px; align-items: center; }
.nav__toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav__toggle span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: .3s; }
.nav__mobile { display: none; flex-direction: column; gap: 6px; padding: 10px 24px 22px; background: rgba(255,255,255,.96); backdrop-filter: blur(14px); }
.nav__mobile a { padding: 12px 4px; font-weight: 600; border-bottom: 1px solid var(--line); }
.nav__mobile .btn { margin-top: 8px; border-bottom: 0; }

/* ============ Hero ============ */
.hero { position: relative; padding: 150px 0 90px; overflow: hidden; }
.hero__bg {
    position: absolute; inset: 0; z-index: 0;
    background:
        radial-gradient(60% 60% at 80% 0%, rgba(124,58,237,.18), transparent 60%),
        radial-gradient(55% 55% at 10% 20%, rgba(34,211,238,.16), transparent 60%),
        linear-gradient(180deg, #f4f5ff 0%, #ffffff 70%);
}
.hero__inner {
    position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto;
    padding: 0 24px; display: grid; grid-template-columns: 1.05fr .95fr;
    gap: 48px; align-items: center;
}
.badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 7px 14px; border-radius: 999px; font-size: 13px; font-weight: 600;
    color: var(--indigo-600); background: rgba(79,70,229,.08);
    border: 1px solid rgba(79,70,229,.18); margin-bottom: 22px;
}
.badge .dot { width: 8px; height: 8px; border-radius: 50%; background: #22c55e; box-shadow: 0 0 0 4px rgba(34,197,94,.2); }
.hero__title { font-size: clamp(34px, 5vw, 56px); line-height: 1.12; font-weight: 800; letter-spacing: -.5px; }
.hero__title .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__sub { margin: 22px 0 30px; font-size: 17px; color: var(--ink-2); max-width: 540px; }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero__trust { margin-top: 38px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; color: var(--muted); font-size: 14px; }
.hero__trust ul { display: flex; gap: 10px; flex-wrap: wrap; }
.hero__trust li { padding: 5px 12px; background: #fff; border: 1px solid var(--line); border-radius: 999px; font-weight: 600; color: var(--ink-2); font-size: 13px; }

.hero__visual { display: grid; place-items: center; }
.chart-card {
    width: 100%; max-width: 380px; background: #fff; border: 1px solid var(--line);
    border-radius: 20px; padding: 18px; box-shadow: var(--shadow-lg);
    animation: float 6s ease-in-out infinite;
}
.chart-card__head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.chart-card__title { font-weight: 700; font-size: 14px; }
.chart-card__tag { font-size: 12px; font-weight: 700; color: #16a34a; background: #dcfce7; padding: 3px 9px; border-radius: 999px; }
.chart { width: 100%; height: auto; display: block; }
.chart-card__foot { display: flex; justify-content: space-between; margin-top: 12px; font-size: 12px; color: var(--ink-2); font-weight: 600; }
.chart-card__foot .muted { color: var(--muted); font-weight: 500; }
.fit { stroke-dasharray: 600; stroke-dashoffset: 600; animation: draw 2.4s var(--ease) forwards .4s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

.hero__wave { position: relative; z-index: 1; margin-top: 30px; height: 60px;
    background: radial-gradient(120% 100% at 50% 0, #fff 40%, transparent 41%); }

/* ============ 指标 ============ */
.stats { background: var(--ink); color: #fff; }
.stats__inner { max-width: var(--maxw); margin: 0 auto; padding: 44px 24px;
    display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; }
.stat { text-align: center; }
.stat__num { font-size: clamp(30px, 4vw, 44px); font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat__label { font-size: 14px; color: #cbd5e1; margin-top: 4px; }

/* ============ 通用区块 ============ */
.section { padding: 96px 0; }
.section--alt { background: var(--bg-alt); }
.section__inner { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section__head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--indigo); margin-bottom: 12px; }
.section__title { font-size: clamp(28px, 3.6vw, 40px); font-weight: 800; letter-spacing: -.5px; }
.section__lead { margin-top: 16px; font-size: 17px; color: var(--muted); }

/* ============ 介绍 ============ */
.about__grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 48px; align-items: center; }
.about__panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 24px; box-shadow: var(--shadow); }
.about__row { display: flex; justify-content: space-between; align-items: center; padding: 16px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.about__row:last-child { border-bottom: 0; }
.about__row span { color: var(--muted); }
.about__row b { color: var(--ink); }
.about__list { display: grid; gap: 18px; }
.about__list li { display: flex; gap: 16px; }
.tick { flex: none; width: 30px; height: 30px; border-radius: 50%; background: rgba(79,70,229,.1); color: var(--indigo); display: grid; place-items: center; font-weight: 800; }
.about__list h4 { font-size: 17px; margin-bottom: 4px; }
.about__list p { color: var(--muted); font-size: 15px; }

/* ============ 卡片 / 亮点 ============ */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
    background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
    padding: 28px; transition: all .3s var(--ease); position: relative; overflow: hidden;
}
.card::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 3px; background: var(--grad); transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease); }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card:hover::before { transform: scaleX(1); }
.card__icon { width: 52px; height: 52px; border-radius: 14px; background: var(--bg-alt); display: grid; place-items: center; font-size: 26px; margin-bottom: 16px; }
.card h3 { font-size: 19px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 15px; }

/* ============ 优势 ============ */
.benefits { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.benefit { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 28px; transition: all .3s var(--ease); }
.benefit:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.benefit h4 { font-size: 18px; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
.benefit h4::before { content: ""; width: 10px; height: 10px; border-radius: 3px; background: var(--grad); }
.benefit p { color: var(--muted); font-size: 15px; }

/* ============ 定价 ============ */
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: stretch; }
.plan {
    background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 32px 28px;
    display: flex; flex-direction: column; position: relative; transition: all .3s var(--ease);
}
.plan:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.plan--featured { border-color: transparent; box-shadow: var(--shadow-lg); background: linear-gradient(180deg, #fff, #fafaff); }
.plan--featured::before { content: ""; position: absolute; inset: 0; border-radius: 22px; padding: 2px; background: var(--grad); -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0); -webkit-mask-composite: xor; mask-composite: exclude; }
.plan__ribbon { position: absolute; top: 18px; right: 18px; background: var(--grad); color: #fff; font-size: 12px; font-weight: 700; padding: 5px 12px; border-radius: 999px; }
.plan__name { font-size: 15px; font-weight: 700; color: var(--indigo); letter-spacing: .5px; }
.plan__price { font-size: 46px; font-weight: 800; margin: 10px 0 2px; letter-spacing: -1px; }
.plan__price .cur { font-size: 24px; vertical-align: super; color: var(--muted); margin-right: 2px; }
.plan__note { color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.plan__list { display: grid; gap: 12px; margin-bottom: 26px; flex: 1; }
.plan__list li { display: flex; gap: 10px; align-items: flex-start; font-size: 14.5px; color: var(--ink-2); }
.plan__list li::before { content: "✓"; color: #16a34a; font-weight: 800; }
.pricing__foot { text-align: center; margin-top: 28px; color: var(--muted); font-size: 14px; }
.pricing__foot a { color: var(--indigo); font-weight: 600; }

/* ============ 联系 ============ */
.contact { background: linear-gradient(180deg, #fff, #f7f8fc); }
.contact__inner { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.contact__info { margin-top: 26px; display: grid; gap: 14px; }
.contact__info li { display: flex; gap: 10px; align-items: center; color: var(--ink-2); font-size: 15px; }
.contact__info a { color: var(--indigo); font-weight: 600; }
.contact__form { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 13.5px; font-weight: 600; color: var(--ink-2); }
.field input, .field select, .field textarea {
    padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm);
    font-size: 15px; font-family: inherit; color: var(--ink); background: #fff; transition: border-color .2s, box-shadow .2s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--indigo); box-shadow: 0 0 0 3px rgba(79,70,229,.15); }
.field textarea { resize: vertical; }
.form__hint { grid-column: 1 / -1; color: #16a34a; font-weight: 600; font-size: 14px; text-align: center; }
.form__error { grid-column: 1 / -1; color: #dc2626; font-weight: 600; font-size: 14px; text-align: center; }
/* 蜜罐字段：视觉隐藏，仅对辅助技术可见，用于诱捕机器人 */
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* ============ 页脚 ============ */
.footer { background: var(--ink); color: #cbd5e1; padding: 56px 0 24px; }
.footer__inner { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: 1.2fr 2fr; gap: 40px; }
.footer__brand .brand__name { color: #fff; }
.footer__brand p { margin-top: 12px; color: #94a3b8; font-size: 14px; max-width: 280px; }
.footer__cols { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.footer__cols h5 { color: #fff; font-size: 14px; margin-bottom: 14px; }
.footer__cols a { display: block; color: #94a3b8; font-size: 14px; padding: 5px 0; transition: color .2s; }
.footer__cols a:hover { color: #fff; }
.footer__bar { max-width: var(--maxw); margin: 36px auto 0; padding: 20px 24px 0; border-top: 1px solid rgba(255,255,255,.1); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; color: #64748b; font-size: 13px; }

/* ============ 滚动揭示动画 ============ */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ============ 响应式 ============ */
@media (max-width: 920px) {
    .nav__links, .nav__actions { display: none; }
    .nav__toggle { display: flex; }
    .nav__mobile.open { display: flex; }
    .hero__inner { grid-template-columns: 1fr; }
    .hero__visual { order: -1; }
    .stats__inner { grid-template-columns: repeat(2,1fr); gap: 28px; }
    .about__grid { grid-template-columns: 1fr; }
    .cards { grid-template-columns: repeat(2,1fr); }
    .benefits { grid-template-columns: 1fr; }
    .pricing { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }
    .contact__inner { grid-template-columns: 1fr; gap: 32px; }
    .footer__inner { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
    .cards { grid-template-columns: 1fr; }
    .contact__form { grid-template-columns: 1fr; }
    .stats__inner { grid-template-columns: 1fr; }
    .section { padding: 72px 0; }
}