/* ================= 基础与变量 ================= */
:root {
    --bg-dark: #060a19;
    --bg-darker: #030510;
    --bg-panel: #0d1430;
    --bg-panel-2: #111a3d;
    --blue: #2f6bff;
    --blue-light: #4d8bff;
    --cyan: #22d3ee;
    --cyan-glow: rgba(34, 211, 238, 0.5);
    --gold: #f5b942;
    --green: #22c55e;
    --text: #eaf0ff;
    --text-muted: #9aa7d0;
    --border: rgba(120, 150, 255, 0.14);
    --grad: linear-gradient(120deg, #2f6bff 0%, #22d3ee 100%);
    --grad-gold: linear-gradient(120deg, #2f6bff 0%, #f5b942 120%);
    --shadow-glow: 0 0 40px rgba(47, 107, 255, 0.35);
    --radius: 18px;
    --maxw: 1200px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
    font-family: 'Noto Sans SC', 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.highlight {
    background: var(--grad);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ================= 按钮 ================= */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 16px;
    padding: 14px 30px;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: transform .25s ease, box-shadow .25s ease, filter .25s ease;
    white-space: nowrap;
}
.btn-lg { padding: 17px 38px; font-size: 17px; }
.btn:hover { transform: translateY(-3px); }

.btn-gradient {
    background: var(--grad);
    color: #fff;
    box-shadow: 0 10px 30px rgba(47, 107, 255, 0.45);
}
.btn-gradient:hover { filter: brightness(1.08); box-shadow: 0 14px 40px rgba(34, 211, 238, 0.5); }

.btn-blue { background: var(--blue); color: #fff; box-shadow: 0 10px 30px rgba(47, 107, 255, 0.45); }
.btn-blue:hover { background: var(--blue-light); }

.btn-green { background: var(--green); color: #fff; box-shadow: 0 10px 30px rgba(34, 197, 94, 0.4); }
.btn-green:hover { filter: brightness(1.1); }

/* ================= 1. 导航栏 ================= */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 18px 0;
    transition: background .3s ease, padding .3s ease, box-shadow .3s ease, backdrop-filter .3s ease;
}
.header.scrolled {
    background: rgba(6, 10, 25, 0.85);
    backdrop-filter: blur(14px);
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
}
.nav-container { display: flex; align-items: center; justify-content: space-between; }

.logo { display: flex; align-items: center; gap: 12px; font-weight: 900; }
.logo-icon {
    display: grid; place-items: center;
    width: 40px; height: 40px;
    border-radius: 11px;
    background: var(--grad);
    color: #fff; font-size: 19px;
    box-shadow: 0 4px 16px rgba(47, 107, 255, 0.5);
}
.logo-text { font-size: 18px; letter-spacing: .5px; }

.nav { display: flex; align-items: center; gap: 8px; }
.nav-link {
    padding: 9px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-muted);
    border-radius: 50px;
    transition: color .2s ease, background .2s ease;
}
.nav-link:hover { color: var(--text); background: rgba(120, 150, 255, 0.08); }
.nav-cta {
    background: var(--grad);
    color: #fff !important;
    font-weight: 700;
    box-shadow: 0 6px 18px rgba(47, 107, 255, 0.4);
}
.nav-cta:hover { filter: brightness(1.08); }

.nav-toggle {
    display: none;
    background: none; border: none;
    color: var(--text); font-size: 24px; cursor: pointer;
}

/* ================= 通用区块 ================= */
.section { padding: 100px 0; position: relative; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 60px; }
.section-head.left { text-align: left; margin: 0 0 40px; }
.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--cyan);
    padding: 6px 16px;
    border: 1px solid rgba(34, 211, 238, 0.3);
    border-radius: 50px;
    background: rgba(34, 211, 238, 0.06);
    margin-bottom: 18px;
}
.section-title { font-size: clamp(26px, 4vw, 40px); font-weight: 900; line-height: 1.25; }
.section-sub { color: var(--text-muted); margin-top: 16px; font-size: 17px; }

/* ================= 2. 首屏 ================= */
.hero {
    position: relative;
    padding: 160px 0 100px;
    background: radial-gradient(1200px 600px at 75% 10%, rgba(47, 107, 255, 0.18), transparent 60%),
                radial-gradient(900px 500px at 10% 90%, rgba(34, 211, 238, 0.12), transparent 60%),
                var(--bg-darker);
    overflow: hidden;
}
.hero-bg-grid {
    position: absolute; inset: 0;
    background-image: linear-gradient(rgba(120,150,255,.06) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(120,150,255,.06) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 40%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 40%, transparent 100%);
}
.hero-container {
    position: relative; z-index: 2;
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 50px;
}
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 14px; font-weight: 500;
    color: var(--cyan);
    background: rgba(34, 211, 238, 0.08);
    border: 1px solid rgba(34, 211, 238, 0.28);
    padding: 8px 18px; border-radius: 50px;
    margin-bottom: 26px;
}
.hero-title {
    font-size: clamp(34px, 5.2vw, 58px);
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: .5px;
}
.hero-subtitle {
    color: var(--text-muted);
    font-size: 18px;
    margin: 24px 0 34px;
    max-width: 560px;
}
.hero-subtitle strong { color: var(--gold); }
.hero-actions { margin-bottom: 46px; }

.hero-stats { display: flex; gap: 44px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; }
.stat-num {
    font-family: 'Orbitron', sans-serif;
    font-size: 30px; font-weight: 800;
    background: var(--grad);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 14px; color: var(--text-muted); }

.hero-visual { position: relative; display: grid; place-items: center; }
.hero-glow {
    position: absolute; width: 80%; height: 80%;
    background: radial-gradient(circle, rgba(47,107,255,.45), transparent 65%);
    filter: blur(40px);
    animation: pulse 5s ease-in-out infinite;
}
.hero-img {
    position: relative;
    border-radius: 24px;
    box-shadow: 0 30px 80px rgba(0,0,0,.6), 0 0 60px rgba(47,107,255,.25);
    animation: float 6s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-16px); } }
@keyframes pulse { 0%,100% { opacity:.6; transform: scale(1);} 50% { opacity:1; transform: scale(1.08);} }

/* ================= 3. 解决方案卡片 ================= */
.solutions { background: var(--bg-dark); }
.cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.card {
    position: relative;
    background: linear-gradient(160deg, var(--bg-panel), var(--bg-darker));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 34px 26px;
    overflow: hidden;
    transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.card::before {
    content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: var(--grad); transform: scaleX(0); transform-origin: left;
    transition: transform .35s ease;
}
.card:hover { transform: translateY(-8px); border-color: rgba(47,107,255,.4); box-shadow: var(--shadow-glow); }
.card:hover::before { transform: scaleX(1); }
.card-icon {
    width: 60px; height: 60px; border-radius: 15px;
    display: grid; place-items: center;
    font-size: 26px; color: var(--cyan);
    background: rgba(34,211,238,.08);
    border: 1px solid rgba(34,211,238,.25);
    margin-bottom: 22px;
}
.card-step {
    position: absolute; top: 24px; right: 26px;
    font-family: 'Orbitron', sans-serif;
    font-size: 34px; font-weight: 800;
    color: rgba(120,150,255,.1);
}
.card-title { font-size: 19px; font-weight: 700; margin-bottom: 12px; }
.card-text { color: var(--text-muted); font-size: 15px; }

/* ================= 4. 平台优势 ================= */
.features {
    background: linear-gradient(180deg, var(--bg-dark), var(--bg-darker));
}
.features-container {
    display: grid; grid-template-columns: 1fr 1fr;
    align-items: center; gap: 60px;
}
.features-visual { position: relative; }
.features-glow {
    position: absolute; inset: 10%;
    background: radial-gradient(circle, rgba(34,211,238,.3), transparent 65%);
    filter: blur(45px);
}
.features-img {
    position: relative;
    border-radius: 22px;
    border: 1px solid var(--border);
    box-shadow: 0 25px 70px rgba(0,0,0,.55);
}
.floating-badge {
    position: absolute;
    display: flex; align-items: center; gap: 8px;
    background: rgba(13,20,48,.9);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border);
    padding: 10px 18px; border-radius: 12px;
    font-size: 14px; font-weight: 600; color: var(--text);
    box-shadow: 0 10px 30px rgba(0,0,0,.4);
}
.floating-badge i { color: var(--cyan); }
.fb-1 { top: 8%; left: -18px; animation: float 5s ease-in-out infinite; }
.fb-2 { bottom: 10%; right: -18px; animation: float 5s ease-in-out infinite .8s; }

.feature-list { display: flex; flex-direction: column; gap: 26px; }
.feature-item { display: flex; gap: 20px; align-items: flex-start; }
.feature-ic {
    flex-shrink: 0;
    width: 54px; height: 54px; border-radius: 14px;
    display: grid; place-items: center;
    font-size: 22px; color: #fff;
    background: var(--grad);
    box-shadow: 0 8px 22px rgba(47,107,255,.4);
}
.feature-item h3 { font-size: 19px; margin-bottom: 6px; }
.feature-item p { color: var(--text-muted); font-size: 15px; }

/* ================= 5. 信誉保障 / 轮播 ================= */
.trust { background: var(--bg-dark); }
.carousel { position: relative; overflow: hidden; border-radius: var(--radius); }
.carousel-track {
    display: flex;
    gap: 24px;
    transition: transform .5s cubic-bezier(.22,.61,.36,1);
}
.gallery-item { flex: 0 0 calc((100% - 48px) / 3); }
.gallery-placeholder {
    aspect-ratio: 4 / 5;
    border-radius: var(--radius);
    border: 2px dashed rgba(120,150,255,.28);
    background: linear-gradient(160deg, var(--bg-panel), var(--bg-darker));
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 12px; text-align: center; color: var(--text-muted);
    transition: border-color .3s ease, transform .3s ease;
}
.gallery-placeholder:hover { border-color: var(--cyan); transform: translateY(-6px); }
.gallery-placeholder i { font-size: 44px; color: rgba(120,150,255,.4); }
.gallery-placeholder span { font-size: 16px; font-weight: 600; color: var(--text); }
.gallery-placeholder small { font-size: 12px; color: var(--text-muted); }

.gallery-shot {
    aspect-ratio: 9 / 16;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-darker);
    overflow: hidden;
    box-shadow: 0 18px 40px rgba(0,0,0,.5);
    transition: border-color .3s ease, transform .3s ease, box-shadow .3s ease;
}
.gallery-shot:hover {
    border-color: var(--cyan);
    transform: translateY(-6px);
    box-shadow: 0 22px 50px rgba(34,211,238,.25);
}
.gallery-shot img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
}

.carousel-btn {
    position: absolute; top: 50%; transform: translateY(-50%);
    width: 48px; height: 48px; border-radius: 50%;
    background: rgba(13,20,48,.92);
    border: 1px solid var(--border);
    color: var(--text); font-size: 18px; cursor: pointer;
    display: grid; place-items: center;
    transition: background .2s ease, transform .2s ease;
    z-index: 5;
}
.carousel-btn:hover { background: var(--blue); transform: translateY(-50%) scale(1.08); }
.carousel-btn.prev { left: 12px; }
.carousel-btn.next { right: 12px; }

.carousel-dots { display: flex; justify-content: center; gap: 10px; margin-top: 28px; }
.dot {
    width: 10px; height: 10px; border-radius: 50%;
    background: rgba(120,150,255,.25); border: none; cursor: pointer;
    transition: all .3s ease;
}
.dot.active { background: var(--grad); width: 28px; border-radius: 50px; }

/* ================= 6. 底部引流 ================= */
.bottom-cta {
    position: relative;
    text-align: center;
    background: radial-gradient(900px 500px at 50% 0%, rgba(47,107,255,.25), transparent 60%), var(--bg-darker);
    overflow: hidden;
}
.cta-bg-grid {
    position: absolute; inset: 0;
    background-image: linear-gradient(rgba(120,150,255,.05) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(120,150,255,.05) 1px, transparent 1px);
    background-size: 46px 46px;
    mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000, transparent 100%);
}
.cta-inner { position: relative; z-index: 2; max-width: 760px; }
.cta-title { font-size: clamp(28px, 4.5vw, 46px); font-weight: 900; line-height: 1.2; }
.cta-sub { color: var(--text-muted); font-size: 18px; margin: 22px 0 40px; }
.cta-actions { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }

/* ================= 7. 页脚 ================= */
/* ================= FAQ ================= */
.faq-list {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.faq-item {
    background: linear-gradient(180deg, var(--bg-panel) 0%, var(--bg-panel-2) 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 22px;
}
.faq-item summary {
    cursor: pointer;
    font-weight: 700;
    font-size: 17px;
    list-style: none;
    color: var(--text);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+';
    float: right;
    color: var(--cyan);
    font-weight: 800;
}
.faq-item[open] summary::after { content: '−'; }
.faq-item p {
    margin-top: 12px;
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.8;
}
.faq-item a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }

.footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border);
    padding: 46px 0;
    text-align: center;
}
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.footer-brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 17px; }
.footer-nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 18px; }
.footer-nav a { color: var(--text-muted); font-size: 14px; transition: color .2s ease; }
.footer-nav a:hover { color: var(--cyan); }
.footer-note { color: var(--text-muted); font-size: 14px; }
.footer-copy { color: rgba(154,167,208,.6); font-size: 13px; }

/* ================= 响应式 ================= */
@media (max-width: 992px) {
    .hero-container { grid-template-columns: 1fr; text-align: center; }
    .hero-content { order: 2; }
    .hero-visual { order: 1; max-width: 440px; margin: 0 auto; }
    .hero-badge, .hero-subtitle { margin-left: auto; margin-right: auto; }
    .hero-stats { justify-content: center; }
    .cards-grid { grid-template-columns: repeat(2, 1fr); }
    .features-container { grid-template-columns: 1fr; gap: 40px; }
    .features-visual { max-width: 460px; margin: 0 auto; order: 2; }
    .features-content { order: 1; }
    .section-head.left { text-align: center; }
    .gallery-item { flex: 0 0 calc((100% - 24px) / 2); }
}

@media (max-width: 768px) {
    .nav {
        position: fixed; top: 0; right: -100%;
        width: 78%; max-width: 320px; height: 100vh;
        flex-direction: column; align-items: stretch;
        justify-content: flex-start;
        gap: 6px; padding: 90px 24px 24px;
        background: var(--bg-panel);
        border-left: 1px solid var(--border);
        box-shadow: -20px 0 60px rgba(0,0,0,.5);
        transition: right .35s ease;
        z-index: 999;
    }
    .nav.open { right: 0; }
    .nav-link { padding: 14px 18px; font-size: 16px; }
    .nav-toggle { display: block; z-index: 1001; }
    .logo-text { font-size: 15px; }
    .section { padding: 70px 0; }
    .hero { padding: 130px 0 70px; }
    .cards-grid { grid-template-columns: 1fr; }
    .gallery-item { flex: 0 0 100%; }
    .hero-stats { gap: 26px; }
    .cta-actions .btn { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
    .container { padding: 0 18px; }
    .btn-lg { width: 100%; justify-content: center; }
    .floating-badge { display: none; }
}