:root {
    --bg: #09111f;
    --bg-soft: #0f1a2d;
    --surface: #f2efe7;
    --surface-soft: rgba(255, 255, 255, 0.06);
    --line: rgba(255, 255, 255, 0.12);
    --text: #eaf0ff;
    --muted: #9aa8c3;
    --ink: #172033;
    --gold: #c9a56a;
    --gold-soft: #edd3a5;
    --blue: #74a3ff;
    --blue-soft: rgba(116, 163, 255, 0.18);
    --shadow: 0 28px 70px rgba(3, 8, 20, 0.45);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--text);
    font-family: "Microsoft YaHei UI", "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at 15% 18%, rgba(116, 163, 255, 0.18), transparent 26%),
        radial-gradient(circle at 88% 22%, rgba(201, 165, 106, 0.16), transparent 24%),
        linear-gradient(180deg, #050b15 0%, var(--bg) 54%, #0a1322 100%);
}

a {
    color: inherit;
    text-decoration: none;
}

code {
    padding: 2px 8px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    font-family: Consolas, monospace;
    font-size: 0.92em;
}

.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 28px;
    backdrop-filter: blur(16px);
    background: rgba(6, 11, 21, 0.44);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.brand-mark {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--gold) 0%, var(--blue) 100%);
    box-shadow: 0 0 28px rgba(116, 163, 255, 0.55);
}

.brand-text,
.topnav {
    font-size: 14px;
}

.topnav {
    display: inline-flex;
    gap: 18px;
    color: var(--muted);
}

.topnav a:hover {
    color: var(--text);
}

.hero {
    min-height: 100svh;
    padding: 108px 0 56px;
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(420px, 0.95fr);
    align-items: center;
}

.hero-copy {
    max-width: 620px;
    padding-left: clamp(28px, 7vw, 96px);
    padding-right: 28px;
}

.eyebrow {
    margin: 0 0 14px;
    color: var(--gold-soft);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.hero h1,
.section-head h2,
.cta-copy h2 {
    margin: 0;
    font-family: "Noto Serif SC", "Source Han Serif SC", "STSong", serif;
    line-height: 1.08;
}

.hero h1 {
    font-size: clamp(48px, 7vw, 86px);
    max-width: 9ch;
}

.hero-text,
.section-copy,
.feature-row p,
.flow-item p,
.plan-copy,
.cta-copy p,
.faq-item p {
    color: var(--muted);
    line-height: 1.8;
}

.hero-text {
    margin: 20px 0 0;
    max-width: 34em;
    font-size: 16px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 26px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 18px;
    border-radius: 999px;
    font-size: 14px;
    transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn-primary {
    color: #071221;
    background: linear-gradient(135deg, var(--gold-soft) 0%, var(--gold) 100%);
    box-shadow: 0 20px 44px rgba(201, 165, 106, 0.22);
}

.btn-secondary {
    color: var(--text);
    border: 1px solid rgba(255, 255, 255, 0.14);
    background: rgba(255, 255, 255, 0.03);
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
    margin-top: 24px;
    color: var(--muted);
    font-size: 13px;
}

.hero-meta span {
    position: relative;
    padding-left: 18px;
}

.hero-meta span::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    transform: translateY(-50%);
    background: linear-gradient(135deg, var(--gold) 0%, var(--blue) 100%);
}

.signal-stage {
    padding-right: clamp(28px, 7vw, 92px);
}

.signal-frame {
    position: relative;
    min-height: 620px;
    border-radius: 34px;
    overflow: hidden;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02)),
        linear-gradient(135deg, rgba(9, 20, 39, 0.8), rgba(11, 18, 32, 0.96));
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow);
}

.signal-grid,
.signal-layer,
.signal-core,
.signal-pill {
    position: absolute;
}

.signal-grid {
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
    background-size: 42px 42px;
    mask-image: linear-gradient(180deg, rgba(0,0,0,1), rgba(0,0,0,0.2));
}

.signal-layer {
    border-radius: 50%;
    filter: blur(3px);
    animation: pulse 5s ease-in-out infinite;
}

.layer-one {
    width: 420px;
    height: 420px;
    left: -60px;
    top: 140px;
    background: radial-gradient(circle, rgba(116, 163, 255, 0.34) 0%, rgba(116, 163, 255, 0) 70%);
}

.layer-two {
    width: 320px;
    height: 320px;
    right: -30px;
    top: 40px;
    background: radial-gradient(circle, rgba(201, 165, 106, 0.28) 0%, rgba(201, 165, 106, 0) 72%);
    animation-delay: -1.6s;
}

.layer-three {
    width: 300px;
    height: 300px;
    right: 110px;
    bottom: -80px;
    background: radial-gradient(circle, rgba(116, 163, 255, 0.16) 0%, rgba(116, 163, 255, 0) 72%);
    animation-delay: -3.2s;
}

.signal-core {
    width: 170px;
    height: 170px;
    right: 122px;
    bottom: 118px;
    border-radius: 32px;
    background:
        linear-gradient(180deg, rgba(255,255,255,0.12), rgba(255,255,255,0.03)),
        linear-gradient(135deg, rgba(21, 33, 57, 0.9), rgba(10, 16, 28, 0.96));
    border: 1px solid rgba(255,255,255,0.09);
    box-shadow:
        inset 0 0 0 1px rgba(255,255,255,0.03),
        0 18px 44px rgba(4, 7, 17, 0.44);
}

.signal-core::before,
.signal-core::after {
    content: "";
    position: absolute;
    border-radius: 50%;
}

.signal-core::before {
    inset: 22px;
    border: 1px solid rgba(201, 165, 106, 0.42);
}

.signal-core::after {
    inset: 54px;
    background: radial-gradient(circle, rgba(201, 165, 106, 0.9) 0%, rgba(116, 163, 255, 0.7) 78%);
    box-shadow: 0 0 30px rgba(116, 163, 255, 0.38);
}

.signal-pill {
    padding: 10px 14px;
    border-radius: 999px;
    border: 1px solid rgba(255,255,255,0.08);
    background: rgba(6, 12, 22, 0.74);
    color: var(--text);
    font-size: 14px;
    box-shadow: 0 18px 36px rgba(1, 4, 12, 0.28);
}

.pill-a { top: 82px; left: 72px; animation: float 5.4s ease-in-out infinite; }
.pill-b { top: 176px; right: 68px; animation: float 4.8s ease-in-out infinite -1s; }
.pill-c { left: 104px; bottom: 148px; animation: float 5.2s ease-in-out infinite -2s; }
.pill-d { right: 54px; bottom: 72px; animation: float 5.8s ease-in-out infinite -2.8s; }

.section {
    padding: 96px clamp(28px, 6vw, 92px);
}

.section-dark {
    background:
        linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0)),
        rgba(255,255,255,0.018);
    border-top: 1px solid rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.section-head {
    max-width: 820px;
}

.section-head h2,
.cta-copy h2 {
    font-size: clamp(30px, 4.8vw, 56px);
    max-width: 12ch;
}

.feature-rail {
    margin-top: 34px;
    border-top: 1px solid var(--line);
}

.feature-row {
    display: grid;
    grid-template-columns: 80px minmax(0, 1fr);
    gap: 20px;
    padding: 26px 0;
    border-bottom: 1px solid var(--line);
}

.feature-index {
    color: var(--gold-soft);
    font-size: 13px;
    letter-spacing: 0.14em;
}

.feature-row h3,
.flow-item h3,
.faq-item h3 {
    margin: 0;
    font-size: 24px;
}

.feature-row p,
.flow-item p,
.faq-item p {
    margin: 10px 0 0;
}

.split {
    display: grid;
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 44px;
    align-items: start;
}

.flow-list {
    border-left: 1px solid rgba(255,255,255,0.1);
    padding-left: 28px;
}

.flow-item {
    padding: 0 0 28px;
    margin-bottom: 28px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.flow-item span {
    display: inline-block;
    margin-bottom: 10px;
    color: var(--gold-soft);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.16em;
}

.section-pricing {
    background:
        radial-gradient(circle at 50% 0%, rgba(201, 165, 106, 0.1), transparent 35%),
        linear-gradient(180deg, rgba(255,255,255,0.018), rgba(255,255,255,0.01));
}

.pricing-stage {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-top: 34px;
}

.price-panel {
    position: relative;
    padding: 28px 24px;
    border-top: 1px solid rgba(255,255,255,0.16);
    background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
}

.price-panel h3 {
    margin: 12px 0 0;
    font-family: "Noto Serif SC", "Source Han Serif SC", "STSong", serif;
    font-size: clamp(40px, 5vw, 66px);
}

.plan {
    margin: 0;
    color: var(--gold-soft);
    font-size: 13px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.plan-meta {
    margin: 10px 0 0;
    color: var(--gold-soft);
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.plan-copy {
    margin: 14px 0 0;
}

.featured {
    transform: translateY(-16px);
    background:
        linear-gradient(180deg, rgba(201, 165, 106, 0.18), rgba(255,255,255,0.05)),
        linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.09),
        0 24px 52px rgba(4, 8, 18, 0.34);
}

.ribbon {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(201, 165, 106, 0.18);
    color: var(--gold-soft);
    font-size: 12px;
}

.section-cta {
    padding-top: 54px;
}

.cta-shell {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) 320px;
    gap: 22px;
    padding: 32px;
    border-radius: 30px;
    background:
        linear-gradient(135deg, rgba(16, 27, 45, 0.98), rgba(8, 14, 25, 0.98)),
        linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.01));
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: var(--shadow);
}

.cta-copy p {
    margin-top: 18px;
}

.cta-qr {
    padding: 18px;
    border-radius: 24px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.07);
    text-align: center;
}

.cta-qr img {
    width: 100%;
    max-width: 240px;
    border-radius: 14px;
    background: #fff;
    padding: 12px;
}

.cta-qr p {
    margin: 14px 0 10px;
    color: var(--muted);
}

.cta-qr code {
    display: block;
    border-radius: 16px;
    padding: 10px 12px;
    line-height: 1.6;
}

.section-contact {
    padding-top: 54px;
}

.contact-shell {
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) 320px;
    gap: 22px;
    padding: 32px;
    border-radius: 30px;
    background:
        linear-gradient(135deg, rgba(12, 21, 36, 0.96), rgba(7, 13, 23, 0.98)),
        linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.01));
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: var(--shadow);
}

.contact-copy {
    max-width: 640px;
}

.contact-copy h2 {
    margin: 0;
    font-family: "Noto Serif SC", "Source Han Serif SC", "STSong", serif;
    font-size: clamp(30px, 4.8vw, 56px);
    line-height: 1.08;
    max-width: 10ch;
}

.contact-copy .section-copy {
    margin: 18px 0 0;
}

.contact-card {
    padding: 18px;
    border-radius: 24px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.07);
    text-align: center;
}

.contact-card img {
    width: 100%;
    max-width: 240px;
    border-radius: 14px;
    background: #fff;
    padding: 12px;
}

.contact-card p {
    margin: 14px 0 8px;
    color: var(--text);
    font-weight: 600;
}

.contact-card span {
    display: block;
    color: var(--muted);
    line-height: 1.7;
}

.faq-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    margin-top: 34px;
}

.faq-item {
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.12);
}

.footer {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
    padding: 24px 28px 36px;
    color: var(--muted);
    font-size: 13px;
}

.reveal {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity 700ms ease, transform 700ms ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.86; }
    50% { transform: scale(1.08); opacity: 1; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@media (max-width: 1100px) {
    .hero,
    .split,
    .cta-shell,
    .contact-shell,
    .pricing-stage,
    .faq-list {
        grid-template-columns: 1fr;
    }

    .featured {
        transform: none;
    }

    .signal-stage,
    .hero-copy {
        padding-left: 28px;
        padding-right: 28px;
    }

    .signal-frame {
        min-height: 480px;
    }
}

@media (max-width: 760px) {
    .topbar {
        padding: 16px 18px;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .topnav {
        flex-wrap: wrap;
        gap: 10px 14px;
    }

    .hero {
        padding-top: 132px;
    }

    .hero h1 {
        max-width: 10ch;
    }

    .signal-frame {
        min-height: 420px;
    }

    .feature-row {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .flow-list {
        padding-left: 0;
        border-left: 0;
    }
}