:root {
    --primary-color: #00d4ff;
    --primary-light: #00e5ff;
    --primary-dark: #00a8cc;
    --accent-color: #7b2cbf;
    --accent-light: #9d4edd;
    --text-primary: #ffffff;
    --text-secondary: #b8b8d0;
    --text-light: #6b6b8d;
    --bg-primary: #0a0a1a;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-dark: #0d0d1f;
    --border-color: #2a2a4a;
    --border-glow: rgba(0, 212, 255, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.2);
    --transition: all 0.3s ease;
    --radius: 8px;
    --radius-lg: 12px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Source Han Sans CN', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
}

.grid-12 { grid-column: span 12; }
.grid-11 { grid-column: span 11; }
.grid-10 { grid-column: span 10; }
.grid-9 { grid-column: span 9; }
.grid-8 { grid-column: span 8; }
.grid-7 { grid-column: span 7; }
.grid-6 { grid-column: span 6; }
.grid-5 { grid-column: span 5; }
.grid-4 { grid-column: span 4; }
.grid-3 { grid-column: span 3; }
.grid-2 { grid-column: span 2; }
.grid-1 { grid-column: span 1; }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 4px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.gap-5 { gap: 20px; }
.gap-6 { gap: 24px; }

.py-1 { padding-top: 4px; padding-bottom: 4px; }
.py-2 { padding-top: 8px; padding-bottom: 8px; }
.py-3 { padding-top: 12px; padding-bottom: 12px; }
.py-4 { padding-top: 16px; padding-bottom: 16px; }
.py-5 { padding-top: 20px; padding-bottom: 20px; }
.py-6 { padding-top: 24px; padding-bottom: 24px; }
.py-8 { padding-top: 32px; padding-bottom: 32px; }
.py-10 { padding-top: 40px; padding-bottom: 40px; }
.py-12 { padding-top: 48px; padding-bottom: 48px; }
.py-16 { padding-top: 64px; padding-bottom: 64px; }

.px-1 { padding-left: 4px; padding-right: 4px; }
.px-2 { padding-left: 8px; padding-right: 8px; }
.px-3 { padding-left: 12px; padding-right: 12px; }
.px-4 { padding-left: 16px; padding-right: 16px; }
.px-5 { padding-left: 20px; padding-right: 20px; }
.px-6 { padding-left: 24px; padding-right: 24px; }

.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mt-5 { margin-top: 20px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }
.mt-10 { margin-top: 40px; }
.mt-12 { margin-top: 48px; }

.mb-1 { margin-bottom: 4px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.mb-5 { margin-bottom: 20px; }
.mb-6 { margin-bottom: 24px; }
.mb-8 { margin-bottom: 32px; }
.mb-10 { margin-bottom: 40px; }
.mb-12 { margin-bottom: 48px; }

.btn {
    display: inline-block;
    padding: 12px 32px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    text-align: center;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.4);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    box-shadow: 0 6px 25px rgba(0, 212, 255, 0.6);
    transform: translateY(-2px);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    color: #fff;
    box-shadow: 0 4px 15px rgba(123, 44, 191, 0.4);
}

.btn-accent:hover {
    background: linear-gradient(135deg, var(--accent-light), var(--accent-color));
    box-shadow: 0 6px 25px rgba(123, 44, 191, 0.6);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--bg-primary);
    box-shadow: var(--shadow-glow);
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
    transform: translateY(-4px);
}

.card-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(0, 212, 255, 0.05));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 28px;
    color: var(--primary-color);
    border: 1px solid rgba(0, 212, 255, 0.3);
}

h1 { font-size: 42px; font-weight: 700; line-height: 1.2; }
h2 { font-size: 32px; font-weight: 600; line-height: 1.3; }
h3 { font-size: 24px; font-weight: 600; line-height: 1.4; }
h4 { font-size: 20px; font-weight: 600; line-height: 1.4; }
h5 { font-size: 18px; font-weight: 500; line-height: 1.5; }
h6 { font-size: 16px; font-weight: 500; line-height: 1.5; }

p { margin-bottom: 16px; color: var(--text-secondary); }
a { color: var(--primary-color); text-decoration: none; }
a:hover { color: var(--primary-light); }

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

header {
    background: rgba(10, 10, 26, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo span { 
    color: var(--primary-color); 
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover { color: var(--primary-color); }

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-links a:hover::after { width: 100%; }

.burger-menu {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.burger-menu span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition);
}

.burger-menu.active span:nth-child(1) { transform: rotate(-45deg) translate(-5px, 6px); }
.burger-menu.active span:nth-child(2) { opacity: 0; }
.burger-menu.active span:nth-child(3) { transform: rotate(45deg) translate(-5px, -6px); }

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-primary) 50%, var(--bg-secondary) 100%);
}

.hero::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.3; }
}

.hero-content {
    position: relative;
    z-index: 1;
    color: #fff;
    max-width: 800px;
    padding: 0 20px;
}

.hero h1 {
    font-size: 52px;
    margin-bottom: 24px;
    text-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
}

.hero h1 span { color: var(--primary-color); }

.hero p {
    font-size: 20px;
    margin-bottom: 40px;
    color: var(--text-secondary);
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.section { padding: 80px 0; }
.section-bg { background: var(--bg-secondary); }

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 36px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-title p {
    font-size: 18px;
    color: var(--text-secondary);
}

.features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.features .card {
    text-align: center;
    padding: 40px 24px;
}

.features h3 { margin-bottom: 12px; color: var(--text-primary); }
.features p { color: var(--text-secondary); }

.products {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.product-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
    transform: translateY(-8px);
}

.product-image {
    height: 200px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(123, 44, 191, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: var(--primary-color);
    border-bottom: 1px solid var(--border-color);
}

.product-info {
    padding: 24px;
}

.product-info h3 { margin-bottom: 12px; color: var(--text-primary); }
.product-info p { margin-bottom: 20px; color: var(--text-secondary); }

.download-section {
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-secondary) 100%);
    padding: 80px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.download-section h2 {
    font-size: 36px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.download-section p {
    font-size: 18px;
    margin-bottom: 40px;
    color: var(--text-secondary);
}

.download-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.download-btn {
    background: rgba(0, 212, 255, 0.1);
    border: 2px solid rgba(0, 212, 255, 0.3);
    color: var(--primary-color);
    padding: 16px 40px;
    border-radius: var(--radius);
    font-size: 18px;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 12px;
}

.download-btn:hover {
    background: rgba(0, 212, 255, 0.2);
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.faq {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg-card);
}

.faq-item summary {
    padding: 20px 24px;
    background: transparent;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    transition: var(--transition);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.faq-item summary::after {
    content: '+';
    font-size: 24px;
    transition: var(--transition);
    color: var(--primary-color);
}

.faq-item[open] summary::after { transform: rotate(45deg); }

.faq-item summary:hover { 
    background: rgba(0, 212, 255, 0.05); 
    border-bottom: 1px solid var(--primary-color);
}

.faq-item p {
    padding: 20px 24px;
    margin: 0;
    background: transparent;
    color: var(--text-secondary);
}

/* ============================================================
   FAQ 步骤化模块 (Step-by-step FAQ)
   ============================================================ */
.faq-steps {
    padding: 8px 24px 24px;
    color: var(--text-secondary);
}

.faq-steps > p {
    padding: 12px 0 14px;
    margin: 0;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 14px;
    border-bottom: 1px dashed var(--border-color);
    margin-bottom: 16px;
}

.faq-step-list {
    list-style: none;
    counter-reset: step-counter;
    padding: 0;
    margin: 0;
}

.faq-step-list li {
    counter-increment: step-counter;
    position: relative;
    padding: 14px 16px 14px 56px;
    margin-bottom: 10px;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
    line-height: 1.75;
    color: var(--text-secondary);
    transition: var(--transition);
}

.faq-step-list li:hover {
    border-color: var(--primary-color);
    background: rgba(0, 212, 255, 0.04);
    transform: translateX(4px);
}

.faq-step-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: 14px;
    top: 12px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #fff;
    font-weight: 700;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
}

.faq-step-list li strong {
    color: var(--text-primary);
    font-weight: 600;
    margin-right: 6px;
}

.faq-footnote {
    padding: 12px 16px !important;
    margin: 16px 0 0 !important;
    background: rgba(0, 212, 255, 0.05) !important;
    border-left: 3px solid var(--primary-color);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--text-light) !important;
    font-size: 13px;
}

footer {
    background: var(--bg-dark);
    color: #fff;
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-content h4 { margin-bottom: 20px; color: var(--text-primary); }

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

.footer-content ul li { margin-bottom: 12px; }

.footer-content ul li a {
    color: var(--text-light);
    transition: var(--transition);
}

.footer-content ul li a:hover { color: var(--primary-color); }

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
    text-align: center;
    color: var(--text-light);
}

.download-page {
    padding-top: 120px;
    min-height: 100vh;
    background: var(--bg-primary);
}

.download-categories {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.download-category {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.download-category:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.download-category .category-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(123, 44, 191, 0.2));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 36px;
    color: var(--primary-color);
    border: 1px solid rgba(0, 212, 255, 0.3);
}

.download-category h3 { margin-bottom: 12px; color: var(--text-primary); }
.download-category p { color: var(--text-secondary); }

.download-list {
    max-width: 1000px;
    margin: 0 auto;
}

.download-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition);
}

.download-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.download-item-info { flex: 1; }
.download-item-info h4 { margin-bottom: 8px; color: var(--text-primary); }
.download-item-info p { margin-bottom: 8px; color: var(--text-secondary); }
.download-item-info .version { color: var(--primary-color); font-weight: 500; }

.download-item-meta {
    text-align: right;
    margin-right: 24px;
}

.download-item-meta span {
    display: block;
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 4px;
}

.download-item-size {
    font-size: 14px;
    color: var(--text-secondary);
}

@media (max-width: 1024px) {
    .features { grid-template-columns: repeat(2, 1fr); }
    .products { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 800px) {
    .hero h1 { font-size: 40px; }
    .hero p { font-size: 18px; }
    .section-title h2 { font-size: 28px; }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(10, 10, 26, 0.98);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 40px;
        gap: 24px;
        transition: var(--transition);
        z-index: 999;
        border-top: 1px solid var(--border-color);
    }

    .nav-links.active { left: 0; }

    .burger-menu { display: flex; }

    .hero h1 { font-size: 32px; }
    .hero p { font-size: 16px; }
    .features { grid-template-columns: 1fr; }
    .products { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; text-align: center; }
    .download-categories { grid-template-columns: 1fr; }
    .download-item { flex-direction: column; text-align: center; gap: 20px; }
    .download-item-meta { margin-right: 0; text-align: center; }
    .status-grid { grid-template-columns: repeat(2, 1fr); }
    .scenarios-grid { grid-template-columns: 1fr; }
    .voices-grid { grid-template-columns: 1fr; }
    .protocol-table { font-size: 13px; }
    .node-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ============================================================
   新模块：状态仪表盘 (Status Dashboard)
   ============================================================ */
.status-board {
    background: linear-gradient(180deg, rgba(0, 212, 255, 0.05) 0%, transparent 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-top: 40px;
    position: relative;
    overflow: hidden;
}

.status-board::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.status-board-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.status-board-title {
    font-size: 14px;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.5px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22c55e;
    box-shadow: 0 0 8px #22c55e;
    animation: blink 1.6s ease-in-out infinite;
}

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

.status-update {
    font-size: 12px;
    color: var(--text-light);
}

.status-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.status-cell {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
}

.status-cell:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.status-cell-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 8px;
    font-variant-numeric: tabular-nums;
}

.status-cell-label {
    font-size: 13px;
    color: var(--text-light);
}

/* ============================================================
   新模块：断连救援场景卡 (Failure Scenarios)
   ============================================================ */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.scenario-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    position: relative;
    transition: var(--transition);
    overflow: hidden;
}

.scenario-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, #ef4444, var(--primary-color));
}

.scenario-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.scenario-tag {
    display: inline-block;
    background: rgba(239, 68, 68, 0.15);
    color: #fca5a5;
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 4px;
    margin-bottom: 16px;
    font-weight: 500;
}

.scenario-card h3 {
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 20px;
}

.scenario-scene {
    background: rgba(0, 0, 0, 0.3);
    border-left: 3px solid #ef4444;
    padding: 14px 16px;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin-bottom: 16px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.scenario-fix {
    border-left: 3px solid #22c55e;
    background: rgba(34, 197, 94, 0.05);
    padding: 14px 16px;
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.scenario-fix strong {
    color: #86efac;
    display: block;
    margin-bottom: 6px;
    font-size: 12px;
    letter-spacing: 0.5px;
}

/* ============================================================
   新模块：用户来信 (Real User Voices)
   ============================================================ */
.voices-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.voice-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    position: relative;
    transition: var(--transition);
}

.voice-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-4px);
}

.voice-quote {
    font-size: 32px;
    color: var(--primary-color);
    opacity: 0.5;
    line-height: 1;
    margin-bottom: 12px;
    font-family: Georgia, serif;
}

.voice-text {
    color: var(--text-primary);
    line-height: 1.8;
    margin-bottom: 20px;
    font-size: 15px;
}

.voice-text strong {
    color: var(--primary-color);
    font-weight: 600;
}

.voice-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.voice-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 600;
    font-size: 16px;
}

.voice-info { flex: 1; }
.voice-name {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 14px;
}
.voice-role {
    color: var(--text-light);
    font-size: 12px;
    margin-top: 2px;
}

.voice-stat {
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    color: var(--primary-color);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}

/* ============================================================
   新模块：协议实验室 (Protocol Lab - Data Table)
   ============================================================ */
.protocol-table-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    overflow-x: auto;
}

.protocol-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    min-width: 720px;
}

.protocol-table thead {
    background: var(--bg-secondary);
}

.protocol-table th {
    text-align: left;
    padding: 16px 20px;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border-color);
}

.protocol-table td {
    padding: 16px 20px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    vertical-align: top;
}

.protocol-table tr:last-child td { border-bottom: none; }
.protocol-table tr:hover { background: rgba(0, 212, 255, 0.03); }

.protocol-name {
    color: var(--text-primary);
    font-weight: 600;
}

.protocol-tag {
    display: inline-block;
    background: rgba(34, 197, 94, 0.15);
    color: #86efac;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 4px;
    margin-left: 8px;
    font-weight: 500;
}

/* ============================================================
   新模块：节点地图 (Node Map)
   ============================================================ */
.node-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 12px;
}

.node-chip {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 14px 16px;
    transition: var(--transition);
    cursor: default;
}

.node-chip:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.node-city {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 6px;
}

.node-flag { font-size: 16px; }

.node-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-light);
}

.node-ms {
    color: #86efac;
    font-variant-numeric: tabular-nums;
    font-weight: 500;
}

.node-load {
    width: 32px;
    height: 4px;
    background: var(--bg-dark);
    border-radius: 2px;
    overflow: hidden;
}

.node-load-bar {
    height: 100%;
    background: linear-gradient(90deg, #22c55e, #eab308);
    border-radius: 2px;
}

/* ============================================================
   新模块：粘性下载条 (Sticky CTA)
   ============================================================ */
.sticky-cta {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #fff;
    padding: 14px 22px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.4);
    z-index: 998;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.sticky-cta:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 12px 32px rgba(0, 212, 255, 0.6);
    color: #fff;
}

/* ============================================================
   新模块：数据条 / 数据单元
   ============================================================ */
.metric-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 32px;
}

.metric-block {
    padding: 24px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius);
    border-left: 3px solid var(--primary-color);
}

.metric-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.metric-unit {
    font-size: 16px;
    color: var(--text-light);
    margin-left: 4px;
}

.metric-desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 8px;
}

/* ============================================================
   新模块：场景长文排版 (Long-form Article)
   ============================================================ */
.article-body {
    max-width: 760px;
    margin: 0 auto;
    padding: 60px 20px;
}

.article-body h2 {
    font-size: 26px;
    color: var(--text-primary);
    margin: 40px 0 16px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.article-body h2:first-of-type {
    border-top: none;
    padding-top: 0;
    margin-top: 24px;
}

.article-body h3 {
    font-size: 18px;
    color: var(--primary-color);
    margin: 24px 0 12px;
}

.article-body p {
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 16px;
    font-size: 15px;
}

.article-body ul, .article-body ol {
    color: var(--text-secondary);
    padding-left: 24px;
    margin-bottom: 16px;
    line-height: 1.9;
}

/* 在 article-body 里强制 .faq-step-list 的步骤样式优先 */
.article-body .faq-step-list {
    list-style: none;
    padding: 0 !important;
    margin: 0 !important;
    margin-bottom: 16px !important;
    line-height: 1.75;
}

.article-body .faq-step-list li {
    counter-increment: step-counter;
    position: relative;
    padding: 14px 16px 14px 56px !important;
    margin-bottom: 10px !important;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.article-body .faq-step-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: 14px;
    top: 12px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #fff;
    font-weight: 700;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
}

.article-body .faq-step-list li strong {
    color: var(--text-primary);
    font-weight: 600;
    margin-right: 6px;
}

.article-body .faq-footnote {
    padding: 12px 16px !important;
    margin: 16px 0 0 !important;
    background: rgba(0, 212, 255, 0.05) !important;
    border-left: 3px solid var(--primary-color);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--text-light) !important;
    font-size: 13px;
}

.article-body li { margin-bottom: 6px; }

.article-body blockquote {
    border-left: 3px solid var(--primary-color);
    padding: 16px 20px;
    background: rgba(0, 212, 255, 0.05);
    margin: 20px 0;
    color: var(--text-primary);
    font-style: italic;
    border-radius: 0 var(--radius) var(--radius) 0;
}

.article-meta {
    color: var(--text-light);
    font-size: 13px;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

/* ============================================================
   响应式补丁（新模块）
   ============================================================ */
@media (max-width: 1024px) {
    .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
    .voices-grid { grid-template-columns: repeat(2, 1fr); }
    .node-grid { grid-template-columns: repeat(4, 1fr); }
    .metric-row { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .status-grid { grid-template-columns: repeat(2, 1fr); }
    .scenarios-grid { grid-template-columns: 1fr; }
    .voices-grid { grid-template-columns: 1fr; }
    .protocol-table { font-size: 13px; }
    .node-grid { grid-template-columns: repeat(3, 1fr); }
    .sticky-cta { bottom: 16px; right: 16px; padding: 12px 18px; font-size: 13px; }
    .metric-number { font-size: 28px; }
}