/* ========== 全局重置 & 变量 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --bg: #0b1424;
    --bg2: #111d30;
    --card: rgba(255, 255, 255, .06);
    --border: rgba(255, 255, 255, .07);
    --text: #c8d6e5;
    --muted: #8899b0;
    --cyan: #00d4ff;
    --blue: #0088ff;
    --grad: linear-gradient(135deg, var(--cyan), var(--blue));
}
body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: #fff;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(11, 20, 36, .88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, .05);
    padding: 14px 0;
}
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 22px;
    font-weight: 700;
}
.logo .icon-bolt {
    font-size: 28px;
    background: var(--grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.logo .tagline {
    font-size: 12px;
    color: var(--muted);
    background: rgba(255, 255, 255, .05);
    padding: 2px 12px;
    border-radius: 40px;
    border: 1px solid rgba(255, 255, 255, .06);
}
.nav-links {
    display: flex;
    gap: 28px;
    font-size: 15px;
    font-weight: 500;
    align-items: center;
}
.nav-links a {
    color: var(--text);
    text-decoration: none;
    position: relative;
    transition: color .3s;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--grad);
    transition: width .3s;
}
.nav-links a:hover {
    color: #fff;
}
.nav-links a:hover::after {
    width: 100%;
}
.lang-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, .15);
    color: var(--muted);
    padding: 2px 12px;
    border-radius: 30px;
    font-size: 12px;
    cursor: pointer;
    transition: .3s;
    font-family: inherit;
}
.lang-btn:hover {
    border-color: var(--cyan);
    color: #fff;
}
.lang-btn.active {
    background: var(--grad);
    border-color: transparent;
    color: #0b1424;
    font-weight: 600;
}
.lang-switcher {
    display: inline-flex;
    gap: 4px;
    margin-left: 16px;
    padding-left: 16px;
    border-left: 1px solid rgba(255, 255, 255, .1);
}
.mobile-toggle {
    display: none;
    font-size: 26px;
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
}

/* ========== Hero ========== */
.hero {
    padding: 160px 0 100px;
    background: radial-gradient(ellipse at 10% 30%, rgba(0, 136, 255, .08), transparent 60%),
                radial-gradient(ellipse at 90% 70%, rgba(0, 212, 255, .05), transparent 50%),
                var(--bg);
}
.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.badge {
    display: inline-block;
    background: rgba(0, 212, 255, .12);
    color: var(--cyan);
    font-size: 13px;
    font-weight: 600;
    padding: 4px 18px;
    border-radius: 40px;
    border: 1px solid rgba(0, 212, 255, .15);
    margin-bottom: 20px;
}
.badge .bolt {
    margin-right: 6px;
}
.hero h1 {
    font-size: clamp(2.6rem, 5.5vw, 4.2rem);
    font-weight: 800;
    line-height: 1.1;
}
.hero h1 .highlight {
    background: var(--grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero .sub {
    font-size: 1.25rem;
    color: var(--text);
    font-weight: 300;
    margin: 8px 0;
}
.hero .desc {
    color: var(--muted);
    max-width: 520px;
    margin-bottom: 28px;
    line-height: 1.8;
}
.hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 24px 40px;
    margin-bottom: 32px;
}
.hero-stats .stat {
    display: flex;
    align-items: center;
    gap: 10px;
}
.hero-stats .stat .icon {
    font-size: 20px;
    color: var(--cyan);
}
.hero-stats .stat .num {
    font-weight: 700;
    font-size: 1.1rem;
}
.hero-stats .stat .label {
    color: var(--muted);
    font-size: .9rem;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 36px;
    border-radius: 60px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: .3s;
    font-family: inherit;
}
.btn-primary {
    background: var(--grad);
    color: #0b1424;
    box-shadow: 0 4px 30px rgba(0, 212, 255, .25);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 45px rgba(0, 212, 255, .35);
}
.btn-outline {
    background: transparent;
    color: #fff;
    border: 1.5px solid rgba(255, 255, 255, .2);
}
.btn-outline:hover {
    border-color: var(--cyan);
    color: var(--cyan);
}
.hero-visual {
    display: flex;
    justify-content: center;
}
.device-sphere {
    max-width: 420px;
    aspect-ratio: 1/1;
    background: radial-gradient(circle at 30% 25%, rgba(0, 212, 255, .1), rgba(11, 20, 36, .9) 70%);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(0, 212, 255, .1);
    position: relative;
}
.device-sphere .lock-icon {
    font-size: 90px;
    background: var(--grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 40px rgba(0, 212, 255, .2));
}
.device-sphere .device-name {
    font-size: 1.2rem;
    letter-spacing: 3px;
    color: var(--text);
    background: rgba(0, 0, 0, .4);
    padding: 8px 28px;
    border-radius: 40px;
    border: 1px solid rgba(255, 255, 255, .05);
}
.device-sphere .pulse {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(0, 212, 255, .08);
    animation: pulse 4s infinite;
}
.device-sphere .pulse:nth-child(1) {
    width: 110%;
    height: 110%;
    animation-delay: 0s;
}
.device-sphere .pulse:nth-child(2) {
    width: 130%;
    height: 130%;
    animation-delay: 1.2s;
}
.device-sphere .pulse:nth-child(3) {
    width: 150%;
    height: 150%;
    animation-delay: 2.4s;
}
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: .6; }
    50% { transform: scale(1.1); opacity: .05; }
}

/* ========== 通用标题 ========== */
.section-title {
    font-size: clamp(2rem, 3.5vw, 2.8rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
}
.section-title .highlight {
    background: var(--grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-sub {
    text-align: center;
    color: var(--muted);
    font-size: 1.05rem;
    max-width: 640px;
    margin: 0 auto 48px;
}

/* ========== 功能 & 操作说明 ========== */
.features,
.instructions {
    padding: 100px 0;
    background: var(--bg2);
    border-top: 1px solid rgba(255, 255, 255, .03);
    border-bottom: 1px solid rgba(255, 255, 255, .03);
}
.features-grid,
.instructions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 36px 30px;
    transition: .4s;
    backdrop-filter: blur(4px);
}
.card:hover {
    transform: translateY(-6px);
    border-color: rgba(0, 212, 255, .15);
    box-shadow: 0 12px 40px rgba(0, 0, 0, .3);
}
.card .icon-box {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: rgba(0, 212, 255, .06);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    color: var(--cyan);
    margin-bottom: 18px;
}
.card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}
.card p {
    color: var(--muted);
    font-size: .95rem;
    line-height: 1.7;
}
.card .step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--grad);
    color: #0b1424;
    font-weight: 700;
    font-size: .9rem;
    margin-bottom: 14px;
}
.card .tag {
    display: inline-block;
    background: rgba(0, 212, 255, .08);
    color: var(--cyan);
    font-size: .7rem;
    font-weight: 600;
    padding: 3px 14px;
    border-radius: 30px;
    margin-top: 12px;
    border: 1px solid rgba(0, 212, 255, .08);
}

/* ========== 视频 ========== */
.video-section {
    padding: 100px 0;
    background: var(--bg);
}
.video-wrapper {
    max-width: 900px;
    margin: 0 auto;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 25px 60px rgba(0, 0, 0, .7);
    border: 1px solid rgba(255, 255, 255, .06);
    background: #000;
}
.video-wrapper video {
    display: block;
    width: 100%;
    aspect-ratio: 16/9;
    background: #0a0a0a;
}
.video-caption {
    text-align: center;
    margin-top: 18px;
    color: var(--muted);
    font-size: .95rem;
}

/* ========== 技术规格 ========== */
.specs {
    padding: 80px 0;
    background: var(--bg);
}
.specs-table {
    max-width: 820px;
    margin: 0 auto;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
}
.specs-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: .95rem;
}
.specs-table th,
.specs-table td {
    padding: 18px 28px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, .04);
}
.specs-table th {
    color: var(--muted);
    font-weight: 500;
    background: rgba(255, 255, 255, .02);
    width: 38%;
}
.specs-table td {
    color: var(--text);
}
.specs-table .hl {
    color: var(--cyan);
    font-weight: 500;
}

/* ========== 注意事项 ========== */
.notice {
    padding: 80px 0 100px;
    background: var(--bg2);
}
.notice-box {
    max-width: 820px;
    margin: 0 auto;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 44px;
    border-left: 4px solid var(--cyan);
}
.notice-box h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.notice-box h3 .icon-warn {
    color: var(--cyan);
}
.notice-box ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.notice-box ul li {
    color: var(--text);
    font-size: .95rem;
    display: flex;
    gap: 14px;
    align-items: flex-start;
}
.notice-box ul li .dot {
    color: var(--cyan);
    margin-top: 4px;
    flex-shrink: 0;
}

/* ========== 页脚 ========== */
.footer {
    padding: 48px 0 32px;
    background: var(--bg);
    border-top: 1px solid rgba(255, 255, 255, .04);
}
.footer .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}
.footer .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
}
.footer .brand .bolt {
    background: var(--grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.footer .copy {
    color: var(--muted);
    font-size: .9rem;
}
.footer .social {
    display: flex;
    gap: 18px;
    font-size: 1.2rem;
}
.footer .social a {
    color: var(--muted);
    text-decoration: none;
    transition: .3s;
}
.footer .social a:hover {
    color: var(--cyan);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero .desc {
        margin: 0 auto 28px;
    }
    .hero-stats {
        justify-content: center;
    }
    .hero-cta {
        justify-content: center;
    }
}
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        gap: 12px;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(11, 20, 36, .96);
        padding: 24px 28px;
        border-bottom: 1px solid rgba(255, 255, 255, .05);
    }
    .nav-links.open {
        display: flex;
    }
    .mobile-toggle {
        display: block;
    }
    .lang-switcher {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        margin-top: 4px;
        justify-content: center;
    }
    .hero {
        padding: 130px 0 60px;
    }
    .device-sphere {
        max-width: 280px;
    }
    .device-sphere .lock-icon {
        font-size: 60px;
    }
    .features-grid,
    .instructions-grid {
        grid-template-columns: 1fr;
    }
    .specs-table th,
    .specs-table td {
        padding: 14px 18px;
        font-size: .85rem;
    }
    .notice-box {
        padding: 28px 22px;
    }
    .footer .container {
        flex-direction: column;
        text-align: center;
    }
}
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
    .card {
        padding: 24px 20px;
    }
}