/* ==========================================================================
   小旋风机场 (xxf.lat) — 视觉系统
   基调：暖橙 × 深靛蓝，风旋动线代替星空流星，与同系列站点区分
   ========================================================================== */

:root {
    --primary: #ff8a3d;
    --primary-hover: #ff6f1a;
    --primary-soft: rgba(255, 138, 61, 0.12);
    --accent: #37c9c1;
    --bg-dark: #11121c;
    --bg-darker: #0a0b12;
    --bg-card: #191b29;
    --bg-card-hover: #212437;
    --text-main: #f4f5f9;
    --text-muted: #9ba0b4;
    --text-dim: #5b6178;
    --border-color: #2a2d40;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border-width: 0;
}

/* ---------- Navbar ---------- */
.navbar {
    position: fixed; top: 0; width: 100%; height: 68px;
    background: rgba(17, 18, 28, 0.88); backdrop-filter: blur(10px);
    z-index: 1000; border-bottom: 1px solid var(--border-color);
    display: flex; justify-content: space-between; align-items: center; padding: 0 5%;
}
.nav-brand { font-size: 21px; font-weight: 700; color: var(--text-main); display: flex; align-items: center; gap: 9px; }
.nav-brand .mark { color: var(--primary); font-size: 22px; }
.nav-links { display: flex; gap: 26px; flex-wrap: wrap; }
.nav-links a { font-weight: 500; font-size: 15px; color: var(--text-muted); transition: color 0.25s; }
.nav-links a:hover { color: var(--primary); }
.nav-actions { display: flex; gap: 12px; align-items: center; }
.menu-toggle { display: none; font-size: 26px; cursor: pointer; color: var(--text-main); background: none; border: none; }
.nav-menu-wrapper { display: flex; align-items: center; gap: 26px; }

.btn {
    display: inline-block; padding: 11px 24px; border-radius: 9px; font-weight: 600;
    text-align: center; transition: all 0.25s; cursor: pointer; border: 1px solid transparent; font-size: 15px;
}
.btn-primary { background: var(--primary); color: #17110a; box-shadow: 0 6px 20px rgba(255, 138, 61, 0.28); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 10px 28px rgba(255, 138, 61, 0.4); }
.btn-outline { border-color: var(--border-color); color: var(--text-main); background: transparent; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-ghost { color: var(--text-muted); padding: 8px 14px; }
.btn-ghost:hover { color: var(--primary); }

/* ---------- Sections ---------- */
section { padding: 90px 5%; max-width: 1180px; margin: 0 auto; }
.section-title { text-align: center; font-size: 32px; margin-bottom: 16px; letter-spacing: -0.5px; }
.section-subtitle { text-align: center; color: var(--text-muted); margin-bottom: 52px; font-size: 16px; max-width: 640px; margin-inline: auto; }
.eyebrow {
    display: inline-block; font-size: 12.5px; font-weight: 700; color: var(--primary);
    letter-spacing: 1px; text-transform: uppercase; margin-bottom: 10px;
}

/* ---------- Hero ---------- */
.hero {
    position: relative; min-height: 92vh; display: flex; flex-direction: column;
    align-items: center; justify-content: center; text-align: center; padding: 130px 5% 70px;
    overflow: hidden; z-index: 1;
    background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(255, 138, 61, 0.10) 0%, transparent 65%), var(--bg-darker);
}
.swirl-field { position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: 0.9; }
.swirl-ring {
    position: absolute; border-radius: 50%; border: 1.5px solid rgba(255, 138, 61, 0.16);
    animation: swirl-spin linear infinite;
}
.swirl-ring.r1 { width: 640px; height: 640px; top: -220px; left: -160px; border-color: rgba(255, 138, 61, 0.18); animation-duration: 60s; }
.swirl-ring.r2 { width: 480px; height: 480px; top: 10%; right: -140px; border-color: rgba(55, 201, 193, 0.16); animation-duration: 46s; animation-direction: reverse; }
.swirl-ring.r3 { width: 320px; height: 320px; bottom: -120px; left: 30%; border-color: rgba(255, 138, 61, 0.12); animation-duration: 38s; }
@keyframes swirl-spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.promo-tag {
    background: var(--primary-soft); color: var(--primary); padding: 7px 18px; border-radius: 20px;
    font-size: 13.5px; font-weight: 600; margin-bottom: 26px; border: 1px solid rgba(255, 138, 61, 0.35); display: inline-block;
}
.hero h1 { font-size: 48px; margin-bottom: 22px; line-height: 1.28; letter-spacing: -1px; max-width: 900px; }
.hero h1 .accent { color: var(--primary); }
.hero p.lead { font-size: 18px; color: var(--text-muted); max-width: 700px; margin-bottom: 34px; }
.hero-stats { display: flex; justify-content: center; gap: 14px; margin-bottom: 38px; flex-wrap: wrap; font-size: 14px; color: var(--text-main); }
.hero-stats span { background: rgba(255,255,255,0.04); border: 1px solid var(--border-color); padding: 8px 16px; border-radius: 9px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
.hero-note { margin-top: 20px; font-size: 13px; color: var(--text-dim); }

/* ---------- Grid / Cards ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.card {
    background: var(--bg-card); padding: 34px 28px; border-radius: 14px; border: 1px solid var(--border-color);
    transition: transform 0.25s, border-color 0.25s, background 0.25s; text-align: left;
}
.card:hover { transform: translateY(-6px); background: var(--bg-card-hover); border-color: rgba(255, 138, 61, 0.4); }
.card-icon { font-size: 34px; margin-bottom: 18px; display: inline-block; }
.card h3 { font-size: 20px; margin-bottom: 12px; }
.card p { color: var(--text-muted); font-size: 15px; }

/* ---------- Quick answers ---------- */
.qa-list { display: flex; flex-direction: column; gap: 14px; max-width: 820px; margin: 0 auto; }
.qa-item {
    display: flex; gap: 16px; background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: 12px; padding: 20px 24px;
}
.qa-q { flex-shrink: 0; font-weight: 700; color: var(--primary); font-size: 15px; min-width: 92px; }
.qa-a { color: var(--text-muted); font-size: 15px; }
.qa-a strong { color: var(--text-main); }

/* ---------- Pricing ---------- */
.pricing-attribution {
    text-align: center; color: var(--text-dim); font-size: 13.5px; margin-bottom: 34px;
}
.pricing-attribution strong { color: var(--text-muted); }
.promo-banner {
    background: rgba(255, 138, 61, 0.06); border: 1px solid rgba(255, 138, 61, 0.24);
    padding: 24px 28px; border-radius: 14px; text-align: center; margin: 0 auto 44px; max-width: 780px;
}
.promo-banner h3 { font-size: 21px; margin-bottom: 10px; color: var(--primary); }
.promo-banner p { font-size: 14.5px; color: var(--text-muted); margin-bottom: 16px; }
.promo-code {
    display: inline-block; background: rgba(255, 138, 61, 0.1); border: 1px dashed var(--primary);
    padding: 9px 18px; border-radius: 8px; margin-bottom: 12px;
}
.promo-code .code { font-size: 19px; font-weight: 700; color: var(--primary); font-family: "SFMono-Regular", Consolas, monospace; letter-spacing: 1.5px; }
.promo-fine { font-size: 12.5px; color: var(--text-dim); }

.pricing-group-title { text-align: center; margin-bottom: 26px; color: var(--primary); font-size: 18px; font-weight: 700; }
.pricing-card { display: flex; flex-direction: column; text-align: center; position: relative; }
.pricing-card.highlight { border-color: rgba(255, 138, 61, 0.5); box-shadow: 0 0 0 1px rgba(255, 138, 61, 0.15), 0 20px 40px rgba(255, 138, 61, 0.08); }
.highlight-tag {
    position: absolute; top: -13px; left: 50%; transform: translateX(-50%); background: var(--primary);
    color: #17110a; padding: 4px 14px; border-radius: 12px; font-weight: 700; font-size: 12.5px; white-space: nowrap;
}
.price { font-size: 38px; font-weight: 700; margin: 16px 0 6px; color: var(--primary); }
.price span { font-size: 15px; color: var(--text-muted); font-weight: 400; }
.price del { font-size: 19px; color: var(--text-dim); font-weight: 400; margin-right: 6px; }
.pricing-sub { color: var(--text-muted); font-size: 14px; margin-bottom: 14px; }
.pricing-features { margin: 18px 0 24px; text-align: left; flex-grow: 1; font-size: 13.5px; }
.pricing-features li { margin-bottom: 10px; padding-left: 20px; position: relative; color: var(--text-muted); }
.pricing-features li::before { content: '✓'; color: var(--primary); font-weight: 700; position: absolute; left: 0; }
.pricing-features li strong { color: var(--text-main); }
.pricing-card .btn { width: 100%; }

/* ---------- Feature rows ---------- */
.feature-row { display: flex; align-items: center; gap: 54px; margin-bottom: 84px; }
.feature-row:last-child { margin-bottom: 0; }
.feature-row:nth-child(even) { flex-direction: row-reverse; }
.feature-text { flex: 1; }
.feature-text h2 { font-size: 27px; margin-bottom: 16px; }
.feature-text p { color: var(--text-muted); font-size: 16px; }
.feature-visual {
    flex: 1; background: var(--bg-card); border-radius: 14px; border: 1px solid var(--border-color);
    padding: 26px; box-shadow: 0 16px 34px rgba(0,0,0,0.3); width: 100%;
}
.node-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.node-table th, .node-table td { padding: 10px 8px; text-align: left; border-bottom: 1px solid var(--border-color); color: var(--text-muted); }
.node-table th { color: var(--text-main); font-weight: 600; }
.node-table td strong { color: var(--text-main); }

/* ---------- Scenarios reused as generic card grid ---------- */

/* ---------- FAQ ---------- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
details.faq-item { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 10px; transition: border-color 0.25s; }
details.faq-item[open] { border-color: rgba(255, 138, 61, 0.45); }
summary { padding: 18px 20px; font-size: 16px; font-weight: 600; cursor: pointer; outline: none; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: '+'; font-size: 22px; color: var(--primary); transition: transform 0.25s; line-height: 1; flex-shrink: 0; }
details.faq-item[open] summary::after { transform: rotate(45deg); }
details.faq-item p { padding: 0 20px 18px; color: var(--text-muted); margin: 0; line-height: 1.7; font-size: 14.5px; }

/* ---------- Bottom CTA ---------- */
.bottom-cta {
    text-align: center; padding: 100px 5%; background: radial-gradient(circle at 50% 100%, rgba(255,138,61,0.08) 0%, transparent 65%), var(--bg-darker);
    border-top: 1px solid var(--border-color);
}
.bottom-cta h2 { font-size: 34px; margin-bottom: 18px; }
.bottom-cta p { color: var(--text-muted); margin-bottom: 34px; font-size: 17px; max-width: 560px; margin-inline: auto; }
.bottom-cta .btn { font-size: 17px; padding: 15px 40px; border-radius: 26px; }

/* ---------- Internal link cards ---------- */
.link-card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.link-card {
    background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; padding: 24px;
    transition: border-color 0.25s, transform 0.25s;
}
.link-card:hover { border-color: rgba(255,138,61,0.4); transform: translateY(-4px); }
.link-card h3 { font-size: 17px; margin-bottom: 8px; color: var(--text-main); }
.link-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 12px; }
.link-card .go { color: var(--primary); font-size: 13.5px; font-weight: 600; }

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--border-color); padding: 56px 5% 36px; background: var(--bg-darker); }
.footer-inner { max-width: 1180px; margin: 0 auto; text-align: center; }
.footer-logo { font-size: 21px; font-weight: 700; color: var(--text-main); margin-bottom: 26px; }
.footer-logo .mark { color: var(--primary); }
.footer-links { display: flex; justify-content: center; gap: 32px; margin-bottom: 30px; flex-wrap: wrap; }
.footer-links a { color: var(--text-muted); transition: color 0.25s; font-size: 14.5px; }
.footer-links a:hover { color: var(--primary); }
.footer-friends { margin-bottom: 24px; font-size: 13.5px; color: var(--text-dim); line-height: 2.2; }
.footer-friends .label { opacity: 0.8; margin-right: 6px; }
.footer-friends a { color: var(--text-muted); margin: 0 9px; transition: color 0.25s; }
.footer-friends a:hover { color: var(--primary); }
.footer-disclosure { max-width: 760px; margin: 0 auto 20px; font-size: 12.5px; color: var(--text-dim); line-height: 1.7; }
.footer-copy { color: var(--text-dim); font-size: 13px; text-align: center; }

/* ---------- Subpages ---------- */
.subpage-header {
    padding: 150px 5% 54px; text-align: center;
    background: radial-gradient(ellipse 70% 60% at 50% 0%, rgba(255,138,61,0.08) 0%, transparent 65%), var(--bg-darker);
    border-bottom: 1px solid var(--border-color);
}
.subpage-header h1 { font-size: 34px; margin-bottom: 14px; line-height: 1.3; }
.subpage-header p { color: var(--text-muted); font-size: 16px; max-width: 640px; margin: 0 auto; }
.breadcrumb-bar { padding: 108px 5% 0; max-width: 900px; margin: 0 auto; }
.breadcrumb { font-size: 13.5px; color: var(--text-dim); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.subpage-content { padding: 60px 5% 90px; max-width: 860px; margin: 0 auto; color: var(--text-muted); font-size: 16px; }
.subpage-content h2 { color: var(--text-main); margin: 44px 0 18px; font-size: 24px; }
.subpage-content h2:first-child { margin-top: 0; }
.subpage-content h3 { color: var(--text-main); margin: 28px 0 14px; font-size: 19px; }
.subpage-content p { margin-bottom: 18px; line-height: 1.85; }
.subpage-content ul, .subpage-content ol { padding-left: 22px; margin-bottom: 20px; }
.subpage-content ul { list-style: disc; }
.subpage-content ol { list-style: decimal; }
.subpage-content li { margin-bottom: 10px; line-height: 1.75; }
.subpage-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
.subpage-content a:hover { color: var(--primary-hover); }
.subpage-content strong { color: var(--text-main); }
.summary-box {
    background: var(--bg-card); border: 1px solid var(--border-color); border-left: 3px solid var(--primary);
    border-radius: 10px; padding: 22px 26px; margin-bottom: 30px;
}
.summary-box p:last-child { margin-bottom: 0; }
.summary-box h2 { margin-top: 0; }
.disclosure-note {
    background: rgba(255,138,61,0.06); border: 1px solid rgba(255,138,61,0.2); border-radius: 10px;
    padding: 16px 20px; font-size: 14px; color: var(--text-muted); margin-bottom: 30px;
}
.data-table { width: 100%; border-collapse: collapse; margin: 20px 0 26px; font-size: 14.5px; }
.data-table th, .data-table td { padding: 12px 14px; border-bottom: 1px solid var(--border-color); text-align: left; }
.data-table th { color: var(--text-main); font-weight: 700; background: var(--bg-card); }
.data-table td { color: var(--text-muted); }
.data-table td strong { color: var(--text-main); }
.table-wrap { overflow-x: auto; }
.toc-box { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 10px; padding: 20px 24px; margin-bottom: 34px; }
.toc-box h2 { margin: 0 0 12px; font-size: 15px; color: var(--text-main); }
.toc-box ul { margin-bottom: 0; padding-left: 20px; }
.toc-box li { margin-bottom: 6px; font-size: 14.5px; }
.updated-note { font-size: 13.5px; color: var(--text-dim); margin-bottom: 30px; }
.inline-cta {
    background: var(--bg-card); border: 1px solid rgba(255,138,61,0.3); border-radius: 12px;
    padding: 24px 28px; text-align: center; margin: 34px 0;
}
.inline-cta p { margin-bottom: 16px; color: var(--text-main); font-size: 15.5px; }

/* ---------- Mobile ---------- */
@media (max-width: 860px) {
    .grid-3, .grid-2, .link-card-grid { grid-template-columns: 1fr; }
    .feature-row, .feature-row:nth-child(even) { flex-direction: column; gap: 32px; }
    .feature-text { text-align: center; }
}
@media (max-width: 768px) {
    .nav-menu-wrapper {
        display: none; flex-direction: column; position: absolute; top: 68px; left: 0; width: 100%;
        background: var(--bg-dark); padding: 26px 20px; border-bottom: 1px solid var(--border-color); gap: 18px;
    }
    .nav-menu-wrapper.active { display: flex; }
    .menu-toggle { display: block; }
    .nav-links { flex-direction: column; gap: 16px; text-align: center; width: 100%; }
    .nav-actions { flex-direction: column; width: 100%; gap: 12px; }
    .nav-actions .btn { width: 100%; }

    .hero { padding-top: 120px; }
    .hero h1 { font-size: 32px; }
    .hero p.lead { font-size: 15.5px; padding: 0 6px; }
    .hero-btns { flex-direction: column; width: 100%; max-width: 300px; margin: 0 auto; }
    .hero-btns .btn { width: 100%; }
    .hero-stats { gap: 10px; }

    section { padding: 56px 5%; }
    .section-title { font-size: 26px; }
    .qa-item { flex-direction: column; gap: 6px; }
    .qa-q { min-width: 0; }

    .bottom-cta h2 { font-size: 27px; }
    .bottom-cta p { font-size: 15px; }

    .footer-links { gap: 16px; flex-direction: column; }
    .subpage-header { padding: 120px 5% 40px; }
    .subpage-header h1 { font-size: 26px; }
    .breadcrumb-bar { padding-top: 88px; }
}