/* ====================================================
   QuickQ - 现代化视觉系统
   深色科技风 + 玻璃拟态 + 渐变
   ==================================================== */

/* ============ 设计 Token ============ */
:root {
    /* 主色系 */
    --c-bg: #0a0e27;
    --c-bg-soft: #0f1535;
    --c-surface: rgba(255, 255, 255, 0.04);
    --c-surface-hover: rgba(255, 255, 255, 0.08);
    --c-border: rgba(255, 255, 255, 0.08);
    --c-border-hover: rgba(255, 255, 255, 0.16);

    /* 文字 */
    --c-text: #e8eaf6;
    --c-text-soft: #b0b6d1;
    --c-text-muted: #7a82a6;

    /* 强调色 */
    --c-primary: #4f8bff;
    --c-primary-light: #6ba6ff;
    --c-primary-dark: #2f6be8;
    --c-accent: #00e5d4;
    --c-accent-2: #b794f6;
    --c-success: #34d399;
    --c-warning: #fbbf24;
    --c-danger: #f87171;

    /* 渐变 */
    --g-primary: linear-gradient(135deg, #4f8bff 0%, #00e5d4 100%);
    --g-secondary: linear-gradient(135deg, #b794f6 0%, #4f8bff 100%);
    --g-accent: linear-gradient(135deg, #00e5d4 0%, #34d399 100%);
    --g-bg-hero: radial-gradient(ellipse at top, #1a2151 0%, #0a0e27 50%);

    /* 阴影 */
    --sh-glow: 0 8px 32px rgba(79, 139, 255, 0.25);
    --sh-glow-strong: 0 12px 48px rgba(79, 139, 255, 0.4);
    --sh-card: 0 8px 32px rgba(0, 0, 0, 0.4);

    /* 圆角 */
    --r-sm: 8px;
    --r-md: 14px;
    --r-lg: 20px;
    --r-xl: 28px;

    /* 间距 */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-6: 24px;
    --space-8: 32px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
}

/* ============ 基础重置 ============ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.7;
    color: var(--c-text);
    background-color: var(--c-bg);
    background-image:
        radial-gradient(at 20% 10%, rgba(79, 139, 255, 0.15) 0px, transparent 50%),
        radial-gradient(at 80% 80%, rgba(183, 148, 246, 0.12) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(0, 229, 212, 0.08) 0px, transparent 50%);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: var(--c-primary-light);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--c-accent);
}

img, svg {
    max-width: 100%;
    display: block;
}

h1, h2, h3, h4 {
    color: #ffffff;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 800;
}

h2 {
    font-size: clamp(28px, 3vw, 40px);
}

h3 {
    font-size: 20px;
}

code {
    background-color: rgba(79, 139, 255, 0.15);
    color: var(--c-accent);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: "JetBrains Mono", Consolas, Monaco, monospace;
    font-size: 13px;
}

/* ============ 通用容器 ============ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============ 顶部导航 ============ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 14, 39, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--c-border);
}

.nav-badge {
    display: inline-block;
    padding: 2px 8px;
    margin-left: 6px;
    border-radius: 100px;
    background: rgba(0, 229, 212, 0.15);
    color: var(--c-accent);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 1px;
    vertical-align: middle;
}

/* ============ Hero 主视觉（升级） ============ */
.hero {
    padding: 160px 0 100px;
    position: relative;
    text-align: center;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 600px;
    height: 600px;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, rgba(79, 139, 255, 0.3) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    animation: heroGlow 8s ease-in-out infinite;
}

@keyframes heroGlow {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    50% { transform: translate(-50%, -50%) scale(1.1); opacity: 1; }
}

/* 装饰：网格点阵 */
.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(79, 139, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(79, 139, 255, 0.06) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 0%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 0%, transparent 100%);
    pointer-events: none;
    z-index: 0;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.site-logo {
    font-size: 22px;
    font-weight: 800;
    background: var(--g-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 10px;
}

.site-logo .logo-mark {
    width: 32px;
    height: 32px;
    background: var(--g-primary);
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
    -webkit-text-fill-color: white;
    box-shadow: var(--sh-glow);
}

/* 用图片作 LOGO 时 */
.site-logo .logo-img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
    box-shadow: var(--sh-glow);
    transition: transform 0.25s ease;
}

.site-logo:hover .logo-img {
    transform: rotate(-6deg) scale(1.05);
}

.site-nav ul {
    list-style: none;
    display: flex;
    gap: 4px;
}

.site-nav a {
    display: inline-block;
    padding: 8px 16px;
    color: var(--c-text-soft);
    font-weight: 500;
    font-size: 14px;
    border-radius: var(--r-sm);
    transition: all 0.2s ease;
}

.site-nav a:hover {
    color: #ffffff;
    background-color: var(--c-surface-hover);
}

.site-nav a.active {
    color: var(--c-primary-light);
    background-color: rgba(79, 139, 255, 0.1);
}

.nav-cta {
    padding: 10px 20px !important;
    background: var(--g-primary) !important;
    color: #ffffff !important;
    -webkit-text-fill-color: white;
    box-shadow: var(--sh-glow);
    font-weight: 600 !important;
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: var(--sh-glow-strong) !important;
}

/* ============ Hero 主视觉 ============ */
.hero {
    padding: 160px 0 100px;
    position: relative;
    text-align: center;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 600px;
    height: 600px;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, rgba(79, 139, 255, 0.3) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 100px;
    font-size: 13px;
    color: var(--c-text-soft);
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

.hero-eyebrow .dot {
    width: 8px;
    height: 8px;
    background: var(--c-success);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--c-success);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero h1 {
    background: linear-gradient(180deg, #ffffff 0%, #b0b6d1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
}

.hero h1 .gradient {
    background: var(--g-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 三色信号灯 */
.signal-stack {
    display: inline-flex;
    gap: 6px;
    vertical-align: middle;
    margin: 0 8px;
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--c-border);
    border-radius: 100px;
}

.signal-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    position: relative;
}

.signal-dot.red {
    background: #ef4444;
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.6);
}

.signal-dot.yellow {
    background: #fbbf24;
    box-shadow: 0 0 8px rgba(251, 191, 36, 0.6);
}

.signal-dot.green {
    background: var(--c-success);
    box-shadow: 0 0 12px var(--c-success);
    animation: glowPulse 1.6s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { box-shadow: 0 0 8px var(--c-success); transform: scale(1); }
    50% { box-shadow: 0 0 18px var(--c-success), 0 0 4px var(--c-success); transform: scale(1.15); }
}

.kbd {
    display: inline-block;
    padding: 2px 8px;
    margin: 0 2px;
    border: 1px solid var(--c-border-hover);
    border-bottom-width: 2px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.06);
    color: #ffffff;
    font-family: "JetBrains Mono", Consolas, Monaco, monospace;
    font-size: 12px;
    vertical-align: 1px;
}

.accent-line {
    display: inline-block;
    padding: 2px 12px;
    color: var(--c-accent);
    border-left: 3px solid var(--c-accent);
    background: rgba(0, 229, 212, 0.06);
    border-radius: 0 4px 4px 0;
}

.hero .hero-slogan {
    font-size: clamp(20px, 2vw, 26px);
    font-weight: 700;
    background: linear-gradient(135deg, #ffffff 0%, var(--c-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 14px;
    letter-spacing: 0.02em;
}

.cursor-blink {
    display: inline-block;
    width: 8px;
    height: 18px;
    background: var(--c-primary-light);
    vertical-align: -3px;
    margin-left: 2px;
    animation: blink 1s steps(1) infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero .hero-desc {
    max-width: 640px;
    margin: 0 auto 40px;
    color: var(--c-text-soft);
    font-size: 17px;
    line-height: 1.7;
}

/* ============ 数据条（信号指标） ============ */
.metric-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.metric-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    padding: 28px 24px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.metric-card:hover {
    border-color: var(--c-primary);
    transform: translateY(-3px);
}

.metric-card .label {
    font-size: 12px;
    color: var(--c-text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 12px;
}

.metric-card .num {
    font-size: 36px;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 6px;
    background: var(--g-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric-card:nth-child(2) .num { background: var(--g-secondary); -webkit-background-clip: text; }
.metric-card:nth-child(3) .num { background: var(--g-accent); -webkit-background-clip: text; }
.metric-card:nth-child(4) .num { background: linear-gradient(135deg, #fbbf24 0%, #f97316 100%); -webkit-background-clip: text; }

.metric-card .trend {
    font-size: 13px;
    color: var(--c-success);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.metric-card .desc {
    font-size: 13px;
    color: var(--c-text-soft);
    margin-top: 8px;
}

.bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 100px;
    overflow: hidden;
    margin-top: 12px;
}

.bar-fill {
    height: 100%;
    background: var(--g-primary);
    border-radius: 100px;
    width: 0;
    transition: width 1.5s ease;
}

.metric-card:nth-child(2) .bar-fill { background: var(--g-secondary); }
.metric-card:nth-child(3) .bar-fill { background: var(--g-accent); }
.metric-card:nth-child(4) .bar-fill { background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%); }

/* ============ 节点路线 ============ */
.route-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.route-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    padding: 28px 24px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    text-align: center;
}

.route-card:hover {
    border-color: var(--c-primary);
    transform: translateY(-4px);
}

.route-card .pin {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: rgba(79, 139, 255, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--c-primary-light);
    border: 1px solid rgba(79, 139, 255, 0.3);
}

.route-card h3 { margin-bottom: 8px; font-size: 18px; }
.route-card p {
    color: var(--c-text-soft);
    font-size: 14px;
    margin-bottom: 16px;
}
.route-card .latency {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 100px;
    background: rgba(52, 211, 153, 0.12);
    color: var(--c-success);
    font-size: 13px;
    font-weight: 600;
}

/* ============ 推荐语墙 ============ */
.quote-card {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
}

.quote-card .quote-mark {
    font-size: 64px;
    line-height: 1;
    color: var(--c-primary);
    opacity: 0.4;
    font-family: Georgia, serif;
    margin-bottom: -10px;
    display: block;
}

.quote-card p {
    font-size: clamp(20px, 2.4vw, 28px);
    font-weight: 500;
    color: #ffffff;
    line-height: 1.5;
    margin-bottom: 20px;
}

.quote-card .author {
    color: var(--c-text-soft);
    font-size: 14px;
}

.quote-card .author strong {
    color: #ffffff;
    margin-right: 8px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--r-md);
    font-size: 15px;
    font-weight: 600;
    transition: all 0.25s ease;
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--g-primary);
    color: #ffffff;
    box-shadow: var(--sh-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--sh-glow-strong);
    color: #ffffff;
}

.btn-ghost {
    background: var(--c-surface);
    color: var(--c-text);
    border: 1px solid var(--c-border);
    backdrop-filter: blur(10px);
}

.btn-ghost:hover {
    background: var(--c-surface-hover);
    border-color: var(--c-border-hover);
    color: #ffffff;
}

/* 状态指示条 */
.status-strip {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 100px;
    padding: 14px 28px;
    display: inline-flex;
    align-items: center;
    gap: 20px;
    font-size: 14px;
    backdrop-filter: blur(10px);
}

.status-strip .dot {
    width: 10px;
    height: 10px;
    background: var(--c-success);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--c-success);
    animation: pulse 2s ease-in-out infinite;
    flex-shrink: 0;
}

.status-strip strong {
    color: #ffffff;
    font-weight: 600;
}

.status-strip .divider {
    width: 1px;
    height: 14px;
    background: var(--c-border);
}

.status-strip .mode {
    color: var(--c-accent);
}

/* ============ 通用区块 ============ */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-eyebrow {
    color: var(--c-primary-light);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(28px, 3vw, 40px);
    margin-bottom: 16px;
}

.section-desc {
    color: var(--c-text-soft);
    max-width: 620px;
    margin: 0 auto;
    font-size: 16px;
}

/* ============ 特性卡片 ============ */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    position: relative;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    padding: 36px 32px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    overflow: hidden;
}

.feature-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--g-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.feature-card:hover {
    border-color: var(--c-border-hover);
    transform: translateY(-6px);
    box-shadow: var(--sh-card);
}

.feature-card > * {
    position: relative;
    z-index: 1;
}

.feature-card .icon {
    width: 56px;
    height: 56px;
    background: var(--g-primary);
    border-radius: var(--r-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin-bottom: 24px;
    box-shadow: var(--sh-glow);
}

.feature-card:nth-child(2) .icon {
    background: var(--g-secondary);
}

.feature-card:nth-child(3) .icon {
    background: var(--g-accent);
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: #ffffff;
}

.feature-card p {
    color: var(--c-text-soft);
    font-size: 14px;
    line-height: 1.7;
}

.feature-card .corner {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 8px;
    height: 8px;
    background: var(--c-primary);
    border-radius: 50%;
    opacity: 0;
    transition: all 0.3s ease;
}

.feature-card:hover .corner {
    opacity: 1;
    box-shadow: 0 0 12px var(--c-primary);
}

/* ============ 步骤 ============ */
.step-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    counter-reset: step;
}

.step-card {
    position: relative;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    padding: 36px 32px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.step-card:hover {
    border-color: var(--c-primary);
    transform: translateY(-4px);
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(79, 139, 255, 0.15);
    border: 1px solid rgba(79, 139, 255, 0.3);
    color: var(--c-primary-light);
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
}

.step-card h3 {
    margin-bottom: 12px;
}

.step-card p {
    color: var(--c-text-soft);
    font-size: 14px;
}

.step-card .step-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    color: var(--c-accent);
    font-weight: 600;
    font-size: 14px;
}

.step-card .step-link:hover {
    gap: 10px;
}

/* ============ 设备支持 ============ */
.devices-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}

.device-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    padding: 32px 20px;
    text-align: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    color: inherit;
    display: block;
}

.device-card:hover {
    border-color: var(--c-primary);
    transform: translateY(-6px);
    background: var(--c-surface-hover);
    color: inherit;
}

.device-card .device-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: var(--c-bg-soft);
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--c-primary-light);
    transition: all 0.3s ease;
}

.device-card:hover .device-icon {
    background: var(--g-primary);
    color: #ffffff;
    transform: scale(1.05);
}

.device-card .device-name {
    font-size: 16px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 4px;
}

.device-card .device-version {
    font-size: 12px;
    color: var(--c-text-muted);
    margin-bottom: 12px;
}

.device-card .device-link {
    font-size: 13px;
    color: var(--c-accent);
    font-weight: 500;
}

/* ============ 帮助中心 ============ */
.help-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.help-block {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    padding: 32px;
    backdrop-filter: blur(10px);
}

.help-block h3 {
    color: #ffffff;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.help-block h3::before {
    content: "";
    width: 4px;
    height: 18px;
    background: var(--g-primary);
    border-radius: 2px;
}

.help-block ul {
    list-style: none;
    padding: 0;
}

.help-block li {
    padding: 10px 0 10px 24px;
    position: relative;
    color: var(--c-text-soft);
    border-bottom: 1px solid var(--c-border);
    cursor: pointer;
    transition: color 0.2s ease;
    font-size: 14px;
}

.help-block li:last-child {
    border-bottom: none;
}

.help-block li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--c-primary);
    font-weight: 700;
    transition: transform 0.2s ease;
}

.help-block li:hover {
    color: var(--c-primary-light);
}

.help-block li:hover::before {
    transform: translateX(4px);
}

/* ============ 联系 ============ */
.contact-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-xl);
    padding: 48px;
    backdrop-filter: blur(10px);
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 36px;
}

.contact-info .item {
    text-align: center;
}

.contact-info .item-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    background: rgba(79, 139, 255, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--c-primary-light);
    font-size: 20px;
}

.contact-info .label {
    font-size: 13px;
    color: var(--c-text-muted);
    margin-bottom: 6px;
}

.contact-info .value {
    color: #ffffff;
    font-weight: 600;
}

/* ============ 404 页面 ============ */
.error-hero {
    padding: 200px 0 100px;
    text-align: center;
    position: relative;
}

.error-hero .error-code {
    font-size: clamp(120px, 20vw, 220px);
    font-weight: 900;
    background: var(--g-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 24px;
    letter-spacing: -0.05em;
    filter: drop-shadow(0 0 40px rgba(79, 139, 255, 0.5));
}

.error-hero .error-glow {
    position: absolute;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(79, 139, 255, 0.25) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.error-hero h2 {
    font-size: 28px;
    margin-bottom: 12px;
}

.error-hero p {
    color: var(--c-text-soft);
    margin: 4px 0;
}

.error-hero .btn-group {
    margin-top: 40px;
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ============ 下载页 ============ */
.download-hero {
    padding: 140px 0 60px;
    text-align: center;
}

.download-section {
    padding: 40px 0 80px;
}

.download-block {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    margin-bottom: 24px;
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.download-block:hover {
    border-color: var(--c-border-hover);
}

.block-header {
    padding: 28px 32px;
    display: flex;
    align-items: center;
    gap: 20px;
    border-bottom: 1px solid var(--c-border);
}

.block-icon {
    width: 56px;
    height: 56px;
    background: var(--g-primary);
    border-radius: var(--r-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #ffffff;
    flex-shrink: 0;
}

.download-block:nth-child(2) .block-icon { background: var(--g-secondary); }
.download-block:nth-child(3) .block-icon { background: var(--g-accent); }
.download-block:nth-child(4) .block-icon { background: linear-gradient(135deg, #f59e0b 0%, #f97316 100%); }
.download-block:nth-child(5) .block-icon { background: linear-gradient(135deg, #ec4899 0%, #8b5cf6 100%); }

.block-title {
    font-size: 22px;
    margin: 0;
}

.block-desc {
    color: var(--c-text-soft);
    font-size: 13px;
    margin: 4px 0 0;
}

.download-block table {
    width: 100%;
    border-collapse: collapse;
}

.download-block th,
.download-block td {
    padding: 18px 32px;
    text-align: left;
    font-size: 14px;
}

.download-block th {
    background: rgba(0, 0, 0, 0.2);
    color: var(--c-text-muted);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.download-block tbody tr {
    border-top: 1px solid var(--c-border);
    transition: background 0.2s ease;
}

.download-block tbody tr:hover {
    background: var(--c-surface-hover);
}

.download-block td.action,
.download-block th.action {
    text-align: right;
    width: 140px;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: var(--r-sm);
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-download.solid {
    background: var(--g-primary);
    color: #ffffff;
}

.btn-download.solid:hover {
    transform: translateY(-1px);
    box-shadow: var(--sh-glow);
    color: #ffffff;
}

.btn-download.outline {
    background: transparent;
    color: var(--c-primary-light);
    border: 1px solid var(--c-border-hover);
}

.btn-download.outline:hover {
    background: rgba(79, 139, 255, 0.1);
    color: var(--c-accent);
}

/* 文本块网格 */
.text-block-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.text-block {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-md);
    padding: 24px 28px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.text-block:hover {
    border-color: var(--c-primary);
    transform: translateY(-2px);
}

.text-block h3 {
    color: var(--c-primary-light);
    margin-bottom: 10px;
    font-size: 17px;
}

.text-block p {
    color: var(--c-text-soft);
    font-size: 14px;
    margin: 0;
}

/* 安装步骤 */
.guide-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.guide-step {
    text-align: center;
    padding: 32px 24px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    backdrop-filter: blur(10px);
}

.guide-step .num {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: rgba(79, 139, 255, 0.15);
    color: var(--c-primary-light);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(79, 139, 255, 0.3);
}

.guide-step h3 {
    margin-bottom: 8px;
}

.guide-step p {
    color: var(--c-text-soft);
    font-size: 13px;
    margin: 0;
}

/* ============ 返回引导 ============ */
.back-cta {
    text-align: center;
    padding: 48px 24px;
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--r-lg);
    backdrop-filter: blur(10px);
    margin: 0 0 80px;
}

.back-cta p {
    color: var(--c-text-soft);
    margin-bottom: 8px;
}

.back-cta a {
    color: var(--c-accent);
    font-weight: 500;
}

/* ============ 页脚 ============ */
.site-footer {
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid var(--c-border);
    padding: 60px 0 30px;
    margin-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.site-footer h4 {
    color: #ffffff;
    font-size: 14px;
    margin-bottom: 18px;
    font-weight: 600;
}

.site-footer .footer-about p {
    color: var(--c-text-soft);
    font-size: 13px;
    max-width: 320px;
    line-height: 1.7;
    margin-top: 12px;
}

.site-footer ul {
    list-style: none;
    padding: 0;
}

.site-footer li {
    margin-bottom: 10px;
    font-size: 13px;
}

.site-footer a {
    color: var(--c-text-soft);
    transition: color 0.2s ease;
}

.site-footer a:hover {
    color: var(--c-accent);
}

.footer-bottom {
    border-top: 1px solid var(--c-border);
    padding-top: 24px;
    text-align: center;
    color: var(--c-text-muted);
    font-size: 13px;
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
    .feature-grid,
    .step-grid,
    .guide-steps {
        grid-template-columns: 1fr;
    }
    .devices-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .help-grid,
    .text-block-grid {
        grid-template-columns: 1fr;
    }
    .contact-info {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .metric-row {
        grid-template-columns: repeat(2, 1fr);
    }
    .route-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    .nav-wrap {
        height: 64px;
    }
    .site-nav {
        display: none;
    }
    .hero {
        padding: 130px 0 70px;
    }
    .section {
        padding: 70px 0;
    }
    .devices-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .download-block th,
    .download-block td {
        padding: 14px 20px;
        font-size: 13px;
    }
    .block-header {
        padding: 20px 24px;
    }
    .download-block td.action,
    .download-block th.action {
        width: auto;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .error-hero {
        padding: 150px 0 80px;
    }
    .status-strip {
        flex-wrap: wrap;
        justify-content: center;
        padding: 12px 20px;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
    }
    .btn {
        width: 100%;
        justify-content: center;
    }
    .devices-grid {
        grid-template-columns: 1fr 1fr;
    }
}