/* ============================================================
   cgasystem.cn - CGA 评估系统产品站
   颐晖智能 (AetherAge) 旗下产品技术站点
   视觉语言：深空黑 × 数据青 × 终端灰 · 等宽数字 · 仪表盘质感
   ============================================================ */

/* --- Reset & Base --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 核心色板 */
    --void: #06090F;          /* 最深背景 */
    --deep: #0B1018;          /* 主背景 */
    --panel: #131A26;         /* 卡片底 */
    --panel-2: #1A2230;       /* 次级卡片 */
    --border: #1F2A3A;        /* 边框 */
    --border-bright: #2A3850; /* 高亮边框 */

    /* 强调色 */
    --cyan: #00E5FF;          /* 主数据青 */
    --cyan-soft: #4DD0E1;
    --cyan-dim: rgba(0, 229, 255, 0.16);
    --violet: #A78BFA;        /* 次强调紫 */
    --violet-dim: rgba(167, 139, 250, 0.18);
    --lime: #B6F500;          /* 高亮数据 */

    /* 文字 */
    --fg: #E8EEF7;
    --fg-mid: rgba(232, 238, 247, 0.7);
    --fg-dim: rgba(232, 238, 247, 0.45);
    --fg-faint: rgba(232, 238, 247, 0.25);

    /* 状态 */
    --ok: #00E676;
    --warn: #FFB74D;
    --err: #FF5252;

    /* 阴影/光晕 */
    --glow-cyan: 0 0 24px rgba(0, 229, 255, 0.35);
    --glow-cyan-strong: 0 0 48px rgba(0, 229, 255, 0.45);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.55);

    --radius: 4px;
    --radius-lg: 8px;

    --max-width: 1200px;

    /* 字体：等宽数字 + 现代无衬线正文 */
    --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--fg);
    line-height: 1.7;
    background: var(--deep);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

/* 全局细微网格背景 */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 229, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 255, 0.025) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease, border-color 0.2s ease;
}

img { max-width: 100%; height: auto; }

::selection {
    background: var(--cyan);
    color: var(--void);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 32px;
    position: relative;
    z-index: 1;
}

/* ============================================================
   顶部状态条 + 导航
   ============================================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(6, 9, 15, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
}

.site-header.scrolled {
    border-bottom-color: var(--border-bright);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

/* 顶部系统状态条 */
.top-bar {
    background: var(--void);
    color: var(--fg-dim);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    border-bottom: 1px solid var(--border);
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 30px;
    letter-spacing: 0.04em;
}

.top-bar .top-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.top-bar .status-dot {
    width: 6px;
    height: 6px;
    background: var(--ok);
    border-radius: 50%;
    box-shadow: 0 0 6px var(--ok);
    animation: pulse 2.4s ease-in-out infinite;
}

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

.top-bar .sys-status { color: var(--ok); }
.top-bar .top-links a {
    color: var(--fg-dim);
    margin-left: 18px;
    font-family: var(--font-body);
}
.top-bar .top-links a:hover { color: var(--cyan); }

.nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

/* Logo：终端方块字标 */
.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--fg);
}

.nav-logo .logo-icon {
    width: 38px;
    height: 38px;
    background: var(--void);
    border: 1px solid var(--cyan);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    box-shadow: var(--glow-cyan), inset 0 0 12px rgba(0, 229, 255, 0.18);
}

.nav-logo .logo-word {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.nav-logo .logo-name {
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--fg);
}

.nav-logo .logo-sub {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    color: var(--cyan);
    font-weight: 400;
    letter-spacing: 0.18em;
    margin-top: 2px;
}

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

.nav-menu > li > a {
    display: block;
    padding: 10px 14px;
    font-size: 0.88rem;
    color: var(--fg-mid);
    font-weight: 500;
    letter-spacing: 0.02em;
    border-radius: var(--radius);
    transition: all 0.2s ease;
    position: relative;
}

.nav-menu > li > a::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    background: var(--cyan);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.nav-menu > li > a:hover,
.nav-menu > li > a.active {
    color: var(--cyan);
    background: rgba(0, 229, 255, 0.06);
}

.nav-menu > li > a:hover::before,
.nav-menu > li > a.active::before {
    opacity: 1;
    left: 4px;
}

/* 下拉 */
.nav-menu .dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    min-width: 220px;
    background: var(--panel);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-bright);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    z-index: 200;
}

.nav-menu .dropdown::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 12px;
    width: 28px;
    height: 2px;
    background: var(--cyan);
    box-shadow: var(--glow-cyan);
}

.nav-menu > li:hover .dropdown {
    display: block;
    animation: dropIn 0.18s ease;
}

@keyframes dropIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: none; }
}

.nav-menu .dropdown li a {
    display: block;
    padding: 9px 14px;
    font-size: 0.84rem;
    color: var(--fg-mid);
    border-radius: var(--radius);
    border-left: 2px solid transparent;
}

.nav-menu .dropdown li a:hover {
    background: var(--cyan-dim);
    color: var(--cyan);
    border-left-color: var(--cyan);
}

/* CTA 按钮：青色发光 */
.nav-cta {
    padding: 10px 22px;
    background: var(--cyan);
    color: var(--void) !important;
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    border-radius: var(--radius);
    display: inline-block;
    box-shadow: var(--glow-cyan);
    transition: all 0.25s ease;
    font-family: var(--font-mono);
}

.nav-cta:hover {
    background: var(--lime);
    box-shadow: 0 0 32px rgba(182, 245, 0, 0.55);
    transform: translateY(-1px);
}

/* 移动端 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--cyan);
    border-radius: 2px;
    transition: all 0.3s;
}

@media (max-width: 768px) {
    .top-bar .top-links { display: none; }
    .nav-toggle { display: flex; }
    .nav-wrap { height: 60px; }
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--panel);
        flex-direction: column;
        padding: 16px 24px 24px;
        border-bottom: 1px solid var(--border-bright);
    }
    .nav-menu.open { display: flex; }
    .nav-menu > li > a::before { display: none; }
    .nav-menu .dropdown {
        display: block;
        position: static;
        box-shadow: none;
        border: none;
        padding-left: 16px;
        background: rgba(0, 229, 255, 0.04);
    }
    .nav-menu .dropdown::before { display: none; }
    .nav-cta { text-align: center; margin-top: 12px; }
}

/* ============================================================
   首屏 Hero：终端命令行感 + 数据仪表盘
   ============================================================ */
.hero {
    position: relative;
    padding: 88px 0 84px;
    overflow: hidden;
    background:
        radial-gradient(1000px 600px at 80% -20%, rgba(0, 229, 255, 0.12), transparent 60%),
        radial-gradient(700px 500px at -10% 110%, rgba(167, 139, 250, 0.10), transparent 55%),
        var(--void);
}

/* 顶部扫描线 */
.hero::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--cyan), transparent);
    box-shadow: 0 0 12px var(--cyan);
}

.hero-wrap {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
    align-items: center;
}

/* 眉头徽章：终端 prompt 风格 */
.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border: 1px solid var(--border-bright);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    color: var(--cyan);
    margin-bottom: 28px;
    background: rgba(0, 229, 255, 0.05);
}

.hero-eyebrow .prompt {
    color: var(--lime);
    font-weight: 700;
}

.hero-content h1 {
    font-family: var(--font-mono);
    font-size: 2.75rem;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: 0.01em;
    margin-bottom: 22px;
    color: var(--fg);
}

.hero-content h1 em {
    font-style: normal;
    color: var(--cyan);
    text-shadow: 0 0 24px rgba(0, 229, 255, 0.5);
}

.hero-content h1 .punct {
    color: var(--lime);
}

.hero-content > p {
    font-size: 1.0625rem;
    color: var(--fg-mid);
    margin-bottom: 36px;
    max-width: 540px;
    line-height: 1.85;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

/* --- 按钮 --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 28px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: all 0.22s ease;
    border: 1px solid transparent;
    font-family: var(--font-mono);
}

.btn-primary {
    background: var(--cyan);
    color: var(--void);
    border-color: var(--cyan);
    box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
    background: var(--lime);
    border-color: var(--lime);
    box-shadow: 0 0 32px rgba(182, 245, 0, 0.6);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--cyan);
    border-color: var(--border-bright);
}

.btn-outline:hover {
    border-color: var(--cyan);
    background: rgba(0, 229, 255, 0.08);
    color: var(--cyan);
}

/* Hero 右侧：终端窗口 */
.hero-visual { display: flex; justify-content: center; align-items: center; }

.terminal {
    background: var(--panel);
    border: 1px solid var(--border-bright);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 229, 255, 0.08);
    max-width: 440px;
    width: 100%;
    overflow: hidden;
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 11px 14px;
    background: var(--void);
    border-bottom: 1px solid var(--border);
}

.terminal-header .dots {
    display: flex;
    gap: 6px;
}

.terminal-header .dot {
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--border-bright);
}

.terminal-header .dot.r { background: #FF5F57; }
.terminal-header .dot.y { background: #FEBC2E; }
.terminal-header .dot.g { background: #28C840; }

.terminal-header .title {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--fg-dim);
    margin-left: auto;
    letter-spacing: 0.04em;
}

.terminal-body {
    padding: 22px 22px 24px;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.85;
}

.terminal-body .line {
    display: flex;
    gap: 6px;
    margin-bottom: 4px;
}

.terminal-body .prompt {
    color: var(--lime);
    flex-shrink: 0;
}

.terminal-body .cmd {
    color: var(--fg);
}

.terminal-body .out {
    color: var(--cyan-soft);
    margin-bottom: 14px;
    padding-left: 14px;
    border-left: 1px solid var(--border-bright);
}

.terminal-body .out .key {
    color: var(--violet);
}

.terminal-body .out .num {
    color: var(--lime);
}

/* Hero 数据指标条 */
.hero-stats {
    display: flex;
    gap: 28px;
    margin-top: 44px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.hero-stat h3 {
    font-family: var(--font-mono);
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--cyan);
    line-height: 1.1;
    text-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
}

.hero-stat h3 .unit {
    font-size: 0.875rem;
    color: var(--fg-dim);
    margin-left: 4px;
}

.hero-stat p {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--fg-dim);
    margin: 6px 0 0;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

@media (max-width: 768px) {
    .hero { padding: 48px 0; }
    .hero-wrap { grid-template-columns: 1fr; gap: 36px; }
    .hero-content h1 { font-size: 1.75rem; }
    .hero-stats { gap: 18px; flex-wrap: wrap; }
    .hero-stat h3 { font-size: 1.375rem; }
}

/* ============================================================
   区块通用
   ============================================================ */
.section {
    padding: 88px 0;
    position: relative;
}

.section-alt {
    background: var(--void);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-header {
    text-align: left;
    max-width: 720px;
    margin: 0 0 56px;
}

.section-header.center { text-align: center; margin: 0 auto 56px; }

.section-header .tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 12px;
    background: var(--cyan-dim);
    color: var(--cyan);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    border-radius: 4px;
    margin-bottom: 18px;
    text-transform: uppercase;
}

.section-header .tag::before {
    content: '#';
    color: var(--lime);
    font-weight: 700;
}

.section-header h2 {
    font-family: var(--font-mono);
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    margin-bottom: 14px;
    color: var(--fg);
    line-height: 1.35;
}

.section-header h2 .accent {
    color: var(--cyan);
    text-shadow: 0 0 18px rgba(0, 229, 255, 0.3);
}

.section-header p {
    font-size: 0.975rem;
    color: var(--fg-mid);
    line-height: 1.8;
    max-width: 620px;
}

.section-header.center p { margin: 0 auto; }

@media (max-width: 768px) {
    .section { padding: 56px 0; }
    .section-header h2 { font-size: 1.5rem; }
    .section-header { margin-bottom: 36px; }
}

/* --- 栅格 --- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }

@media (max-width: 968px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* --- 卡片：终端窗口 + 数据条 --- */
.card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--cyan);
    box-shadow: var(--glow-cyan);
    transition: width 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.card:hover {
    border-color: var(--cyan);
    background: var(--panel-2);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 229, 255, 0.1);
}

.card:hover::before { width: 100%; }

.card .card-num {
    position: absolute;
    top: 18px;
    right: 22px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--fg-faint);
    letter-spacing: 0.08em;
}

.card .card-icon {
    width: 48px;
    height: 48px;
    background: var(--cyan-dim);
    border: 1px solid var(--border-bright);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    color: var(--cyan);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 22px;
}

.card h3 {
    font-family: var(--font-mono);
    font-size: 1.0625rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    margin-bottom: 10px;
    color: var(--fg);
}

.card p {
    font-size: 0.875rem;
    color: var(--fg-mid);
    line-height: 1.75;
    margin-bottom: 16px;
}

.card .card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--cyan);
    text-transform: uppercase;
}

.card .card-link::after {
    content: '→';
    transition: transform 0.2s ease;
}

.card .card-link:hover::after {
    transform: translateX(4px);
}

/* --- 特性条目 --- */
.feature-item {
    display: flex;
    gap: 18px;
    padding: 24px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-left: 2px solid var(--border-bright);
    border-radius: var(--radius-lg);
    margin-bottom: 14px;
    transition: all 0.3s ease;
}

.feature-item:hover {
    border-left-color: var(--cyan);
    background: var(--panel-2);
    transform: translateX(4px);
}

.feature-item .fi-icon {
    flex-shrink: 0;
    width: 46px;
    height: 46px;
    background: var(--cyan-dim);
    color: var(--cyan);
    border: 1px solid var(--border-bright);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 1.05rem;
    font-weight: 700;
}

.feature-item h4 {
    font-family: var(--font-mono);
    font-size: 0.96rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--fg);
}

.feature-item p {
    font-size: 0.84rem;
    color: var(--fg-mid);
    line-height: 1.7;
}

/* --- 表格 --- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--panel);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    margin: 24px 0;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.data-table th {
    background: var(--void);
    color: var(--cyan);
    padding: 13px 20px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-align: left;
    border-bottom: 1px solid var(--cyan-dim);
    text-transform: uppercase;
    font-size: 0.78rem;
}

.data-table td {
    padding: 13px 20px;
    color: var(--fg-mid);
    border-bottom: 1px solid var(--border);
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: rgba(0, 229, 255, 0.04); color: var(--fg); }

/* ============================================================
   CTA 区：青色光带
   ============================================================ */
.cta-section {
    position: relative;
    background: var(--void);
    border-top: 1px solid var(--border-bright);
    border-bottom: 1px solid var(--border-bright);
    color: var(--fg);
    padding: 72px 0;
    text-align: center;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(600px 280px at 50% 0%, rgba(0, 229, 255, 0.14), transparent 60%);
}

.cta-section > .container { position: relative; z-index: 1; }

.cta-section h2 {
    font-family: var(--font-mono);
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    margin-bottom: 16px;
    color: var(--fg);
}

.cta-section h2 .accent { color: var(--cyan); }

.cta-section p {
    font-size: 1rem;
    color: var(--fg-mid);
    margin-bottom: 32px;
}

/* ============================================================
   内页头部：终端命令行风
   ============================================================ */
.breadcrumbs {
    background: var(--void);
    border-bottom: 1px solid var(--border);
    padding: 13px 0;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--fg-dim);
}

.breadcrumbs a { color: var(--fg-mid); }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs .sep { margin: 0 10px; color: var(--fg-faint); }
.breadcrumbs .prompt { color: var(--lime); margin-right: 6px; }

.page-header {
    position: relative;
    background: var(--void);
    border-bottom: 1px solid var(--border-bright);
    padding: 64px 0;
    text-align: left;
    color: var(--fg);
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, transparent, var(--cyan), transparent);
    box-shadow: 0 0 12px var(--cyan);
}

.page-header .container { position: relative; padding-left: 56px; }

.page-header h1 {
    font-family: var(--font-mono);
    font-size: 2.125rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    color: var(--fg);
    margin-bottom: 14px;
}

.page-header h1 .accent { color: var(--cyan); }

.page-header p {
    font-size: 1rem;
    color: var(--fg-mid);
    max-width: 660px;
    line-height: 1.8;
}

@media (max-width: 768px) {
    .page-header { padding: 44px 0; }
    .page-header h1 { font-size: 1.55rem; }
    .page-header .container { padding-left: 32px; }
}

/* ============================================================
   正文排版
   ============================================================ */
.content-area {
    max-width: 860px;
    margin: 0 auto;
    padding: 52px 32px;
}

.content-area h2 {
    font-family: var(--font-mono);
    font-size: 1.4375rem;
    font-weight: 700;
    color: var(--fg);
    letter-spacing: 0.01em;
    margin: 44px 0 16px;
    padding-left: 14px;
    border-left: 2px solid var(--cyan);
    box-shadow: inset 4px 0 8px -4px rgba(0, 229, 255, 0.4);
}

.content-area h2:first-child { margin-top: 0; }

.content-area h3 {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--cyan);
    margin: 28px 0 10px;
}

.content-area p {
    font-size: 0.95rem;
    color: var(--fg-mid);
    line-height: 1.85;
    margin-bottom: 14px;
}

.content-area ul, .content-area ol {
    margin: 0 0 14px 22px;
    color: var(--fg-mid);
    line-height: 1.85;
}

.content-area li { margin-bottom: 6px; }

.content-area strong { color: var(--fg); }

/* 提示框 */
.callout {
    background: var(--panel);
    border-left: 2px solid var(--cyan);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 18px 22px;
    margin: 24px 0;
    font-size: 0.9rem;
    color: var(--fg-mid);
}

.callout strong { color: var(--cyan); }

.callout-warning {
    background: rgba(255, 183, 77, 0.08);
    border-left-color: var(--warn);
}
.callout-warning strong { color: var(--warn); }

/* ============================================================
   流程步骤（带连接线）
   ============================================================ */
.stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 44px 0;
}

.stat-item {
    text-align: center;
    padding: 24px 18px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.stat-item h3 {
    font-family: var(--font-mono);
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--cyan);
    margin-bottom: 6px;
    line-height: 1.1;
    text-shadow: 0 0 16px rgba(0, 229, 255, 0.25);
}

.stat-item p {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--fg-dim);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

@media (max-width: 768px) {
    .stats-row { grid-template-columns: repeat(2, 1fr); }
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
    margin: 44px 0;
    position: relative;
}

.process-step {
    text-align: center;
    padding: 28px 22px;
    background: var(--panel);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    position: relative;
    transition: all 0.3s ease;
}

.process-step:hover {
    border-color: var(--cyan);
    transform: translateY(-4px);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.5);
}

.process-step .step-num {
    width: 48px;
    height: 48px;
    background: var(--void);
    border: 1px solid var(--cyan);
    color: var(--cyan);
    font-family: var(--font-mono);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 auto 16px;
    box-shadow: var(--glow-cyan);
}

.process-step h4 {
    font-family: var(--font-mono);
    font-size: 0.94rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--fg);
}

.process-step p {
    font-size: 0.78rem;
    color: var(--fg-mid);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .process-steps { grid-template-columns: 1fr 1fr; }
}

/* ============================================================
   联系表单
   ============================================================ */
.contact-form {
    background: var(--panel);
    padding: 42px 40px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-bright);
    box-shadow: var(--shadow-lg);
    max-width: 640px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.contact-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 80px;
    height: 2px;
    background: var(--cyan);
    box-shadow: var(--glow-cyan);
}

.form-group { margin-bottom: 20px; }

.form-group label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--fg);
    margin-bottom: 6px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.form-group label .required { color: var(--err); margin-left: 2px; }

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-family: inherit;
    color: var(--fg);
    background: var(--void);
    transition: all 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--cyan);
    background: var(--deep);
    box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.12);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
    font-family: var(--font-mono);
}

/* ============================================================
   页脚：深空黑
   ============================================================ */
.site-footer {
    background: var(--void);
    color: var(--fg-dim);
    padding: 0;
    margin-top: 0;
    border-top: 1px solid var(--border-bright);
    position: relative;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 0;
    width: 200px;
    height: 1px;
    background: var(--cyan);
    box-shadow: var(--glow-cyan);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 44px;
    padding: 60px 0 40px;
    border-bottom: 1px solid var(--border);
}

.footer-brand h3 {
    font-family: var(--font-mono);
    color: var(--fg);
    font-size: 1.0625rem;
    letter-spacing: 0.05em;
    margin-bottom: 14px;
}

.footer-brand p {
    font-size: 0.84rem;
    line-height: 1.8;
    margin-bottom: 14px;
    color: var(--fg-dim);
}

.footer-col h4 {
    color: var(--cyan);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-bright);
    text-transform: uppercase;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }

.footer-col a {
    font-size: 0.84rem;
    color: var(--fg-dim);
    font-family: var(--font-mono);
}

.footer-col a:hover { color: var(--cyan); }

.footer-col p {
    font-size: 0.84rem;
    margin-bottom: 8px;
    line-height: 1.7;
    color: var(--fg-dim);
}

.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--fg-faint);
    letter-spacing: 0.06em;
}

.footer-bottom a { color: var(--fg-dim); }
.footer-bottom a:hover { color: var(--cyan); }
.footer-icp { color: var(--fg-faint); margin-left: 8px; }

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
        padding: 40px 0 28px;
    }
}

/* ============================================================
   FAQ
   ============================================================ */
.faq-item {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item[open] {
    border-color: var(--cyan);
    box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.15);
}

.faq-item summary {
    padding: 18px 24px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--fg);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: '+';
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--cyan);
    font-weight: 400;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.faq-item[open] summary::after {
    content: '−';
}

.faq-item .faq-answer {
    padding: 0 24px 18px;
    font-size: 0.875rem;
    color: var(--fg-mid);
    line-height: 1.8;
}

/* ============================================================
   徽章
   ============================================================ */
.badge {
    display: inline-block;
    padding: 3px 11px;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
}

.badge-blue {
    background: var(--cyan-dim);
    color: var(--cyan);
    border: 1px solid var(--border-bright);
}

.badge-green {
    background: rgba(0, 230, 118, 0.12);
    color: var(--ok);
    border: 1px solid rgba(0, 230, 118, 0.3);
}

.badge-orange {
    background: rgba(255, 183, 77, 0.12);
    color: var(--warn);
    border: 1px solid rgba(255, 183, 77, 0.3);
}

/* ============================================================
   滚动进场
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.reveal.visible {
    opacity: 1;
    transform: none;
}

.reveal-d1 { transition-delay: 0.08s; }
.reveal-d2 { transition-delay: 0.16s; }
.reveal-d3 { transition-delay: 0.24s; }

@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
    html { scroll-behavior: auto; }
}

/* --- Utility --- */
.text-center { text-align: center; }
.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }
.mb-2 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 32px; }

/* --- Print --- */
@media print {
    .site-header, .site-footer, .cta-section, .nav-cta, .top-bar { display: none; }
    body { background: white; color: black; }
}