/* ========================================
   信息来源透明度观察站 - 主样式表
   设计风格：服务型霓虹边框点缀，语气潮流先锋
   CSS前缀：b2s01k01n04-ripple-
   ======================================== */

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

:root {
    --neon-cyan: #00ffc8;
    --neon-blue: #00b4ff;
    --neon-purple: #a855f7;
    --dark-bg: #0a0e1a;
    --dark-card: #111827;
    --dark-surface: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-glow: rgba(0, 255, 200, 0.3);
    --accent-gradient: linear-gradient(135deg, #00ffc8, #00b4ff);
    --font-display: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
    --shadow-neon: 0 0 15px rgba(0, 255, 200, 0.15), 0 0 30px rgba(0, 180, 255, 0.08);
}

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

body {
    font-family: var(--font-body);
    background-color: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: var(--neon-cyan);
    text-decoration: none;
    transition: color 0.2s var(--ease-out);
}

a:hover {
    color: var(--neon-blue);
}

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

ul, ol {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

/* === Container === */
.b2s01k01n04-ripple-container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
}

@media (min-width: 768px) {
    .b2s01k01n04-ripple-container {
        padding: 0 2rem;
    }
}

@media (min-width: 1200px) {
    .b2s01k01n04-ripple-container {
        padding: 0 2.5rem;
    }
}

/* === Header / Navigation === */
.b2s01k01n04-ripple-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 14, 26, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-glow);
    transition: transform 0.3s var(--ease-out);
}

.b2s01k01n04-ripple-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.b2s01k01n04-ripple-logo img {
    height: 40px;
    width: auto;
}

.b2s01k01n04-ripple-nav-list {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.b2s01k01n04-ripple-nav-item a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.25s var(--ease-out);
}

.b2s01k01n04-ripple-nav-item a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width 0.3s var(--ease-out);
}

.b2s01k01n04-ripple-nav-item a:hover,
.b2s01k01n04-ripple-nav-item a.active {
    color: var(--neon-cyan);
}

.b2s01k01n04-ripple-nav-item a:hover::after,
.b2s01k01n04-ripple-nav-item a.active::after {
    width: 100%;
}

/* Mobile menu toggle */
.b2s01k01n04-ripple-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.b2s01k01n04-ripple-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--neon-cyan);
    transition: transform 0.3s var(--ease-out);
}

@media (max-width: 768px) {
    .b2s01k01n04-ripple-menu-toggle {
        display: flex;
    }

    .b2s01k01n04-ripple-nav-list {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(10, 14, 26, 0.98);
        padding: 2rem;
        gap: 1.5rem;
        transform: translateY(-120%);
        transition: transform 0.4s var(--ease-out);
        border-bottom: 1px solid var(--border-glow);
    }

    .b2s01k01n04-ripple-nav-list.open {
        transform: translateY(0);
    }
}

/* === Hero / Banner === */
.b2s01k01n04-ripple-hero {
    position: relative;
    min-height: 85vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    margin-top: 72px;
}

.b2s01k01n04-ripple-hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.b2s01k01n04-ripple-hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.4;
}

.b2s01k01n04-ripple-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(10,14,26,0.7) 0%, rgba(10,14,26,0.95) 100%);
    z-index: 1;
}

.b2s01k01n04-ripple-hero-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
}

.b2s01k01n04-ripple-hero-content h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: 1.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.b2s01k01n04-ripple-hero-content p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 560px;
}

/* === Buttons === */
.b2s01k01n04-ripple-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: transform 0.16s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.b2s01k01n04-ripple-btn:active {
    transform: scale(0.97);
}

.b2s01k01n04-ripple-btn-primary {
    background: var(--accent-gradient);
    color: var(--dark-bg);
    box-shadow: var(--shadow-neon);
}

.b2s01k01n04-ripple-btn-primary:hover {
    box-shadow: 0 0 25px rgba(0, 255, 200, 0.3), 0 0 50px rgba(0, 180, 255, 0.15);
    color: var(--dark-bg);
}

.b2s01k01n04-ripple-btn-outline {
    background: transparent;
    color: var(--neon-cyan);
    border: 1px solid var(--border-glow);
}

.b2s01k01n04-ripple-btn-outline:hover {
    background: rgba(0, 255, 200, 0.08);
    border-color: var(--neon-cyan);
}

/* === Section === */
.b2s01k01n04-ripple-section {
    padding: 5rem 0;
}

.b2s01k01n04-ripple-section-title {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    margin-bottom: 1rem;
    text-align: center;
}

.b2s01k01n04-ripple-section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 3rem;
    font-size: 1.05rem;
}

/* === Cards === */
.b2s01k01n04-ripple-card {
    background: var(--dark-card);
    border: 1px solid rgba(0, 255, 200, 0.12);
    border-radius: 12px;
    padding: 2rem;
    transition: border-color 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out), transform 0.25s var(--ease-out);
}

.b2s01k01n04-ripple-card:hover {
    border-color: var(--neon-cyan);
    box-shadow: var(--shadow-neon);
    transform: translateY(-4px);
}

.b2s01k01n04-ripple-card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1.25rem;
}

.b2s01k01n04-ripple-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}

.b2s01k01n04-ripple-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.b2s01k01n04-ripple-card-meta {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* === Grid Layouts === */
.b2s01k01n04-ripple-grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.b2s01k01n04-ripple-grid-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.b2s01k01n04-ripple-grid-4 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .b2s01k01n04-ripple-grid-2 { grid-template-columns: repeat(2, 1fr); }
    .b2s01k01n04-ripple-grid-3 { grid-template-columns: repeat(2, 1fr); }
    .b2s01k01n04-ripple-grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 992px) {
    .b2s01k01n04-ripple-grid-3 { grid-template-columns: repeat(3, 1fr); }
    .b2s01k01n04-ripple-grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* === Feature / Advantage Blocks === */
.b2s01k01n04-ripple-feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: rgba(0, 255, 200, 0.08);
    border: 1px solid var(--border-glow);
    margin-bottom: 1.25rem;
    font-size: 1.5rem;
}

/* === FAQ === */
.b2s01k01n04-ripple-faq-item {
    border: 1px solid rgba(0, 255, 200, 0.1);
    border-radius: 8px;
    margin-bottom: 1rem;
    overflow: hidden;
}

.b2s01k01n04-ripple-faq-question {
    padding: 1.25rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--dark-card);
    transition: background 0.2s;
}

.b2s01k01n04-ripple-faq-question:hover {
    background: var(--dark-surface);
}

.b2s01k01n04-ripple-faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease-out), padding 0.3s;
    color: var(--text-secondary);
    line-height: 1.8;
}

.b2s01k01n04-ripple-faq-item.active .b2s01k01n04-ripple-faq-answer {
    max-height: 500px;
    padding: 1.25rem 1.5rem;
}

/* === Breadcrumb === */
.b2s01k01n04-ripple-breadcrumb {
    padding: 1rem 0;
    margin-top: 72px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.b2s01k01n04-ripple-breadcrumb a {
    color: var(--text-secondary);
}

.b2s01k01n04-ripple-breadcrumb span {
    margin: 0 0.5rem;
    color: var(--text-muted);
}

/* === Footer === */
.b2s01k01n04-ripple-footer {
    background: var(--dark-card);
    border-top: 1px solid var(--border-glow);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.b2s01k01n04-ripple-footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    margin-bottom: 3rem;
}

@media (min-width: 768px) {
    .b2s01k01n04-ripple-footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .b2s01k01n04-ripple-footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1.5fr;
    }
}

.b2s01k01n04-ripple-footer h4 {
    font-size: 1.05rem;
    margin-bottom: 1.25rem;
    color: var(--neon-cyan);
}

.b2s01k01n04-ripple-footer ul li {
    margin-bottom: 0.6rem;
}

.b2s01k01n04-ripple-footer ul li a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.b2s01k01n04-ripple-footer ul li a:hover {
    color: var(--neon-cyan);
}

.b2s01k01n04-ripple-footer-bottom {
    border-top: 1px solid rgba(0, 255, 200, 0.1);
    padding-top: 2rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.b2s01k01n04-ripple-footer-bottom p {
    margin-bottom: 0.5rem;
}

/* === Social Icons === */
.b2s01k01n04-ripple-social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.b2s01k01n04-ripple-social-links a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid var(--border-glow);
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all 0.25s var(--ease-out);
}

.b2s01k01n04-ripple-social-links a:hover {
    background: var(--neon-cyan);
    color: var(--dark-bg);
    border-color: var(--neon-cyan);
}

/* === Video Section === */
.b2s01k01n04-ripple-video-wrapper {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-glow);
    box-shadow: var(--shadow-neon);
}

.b2s01k01n04-ripple-video-wrapper video {
    width: 100%;
    display: block;
}

/* === Interactive Tool === */
.b2s01k01n04-ripple-tool-panel {
    background: var(--dark-card);
    border: 1px solid var(--border-glow);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: var(--shadow-neon);
}

.b2s01k01n04-ripple-tool-panel h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--neon-cyan);
}

.b2s01k01n04-ripple-tool-input {
    width: 100%;
    padding: 0.85rem 1.25rem;
    background: var(--dark-surface);
    border: 1px solid rgba(0, 255, 200, 0.2);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 1rem;
    transition: border-color 0.25s;
}

.b2s01k01n04-ripple-tool-input:focus {
    outline: none;
    border-color: var(--neon-cyan);
}

/* === Timeline === */
.b2s01k01n04-ripple-timeline {
    position: relative;
    padding-left: 2rem;
}

.b2s01k01n04-ripple-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--accent-gradient);
}

.b2s01k01n04-ripple-timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
    padding-left: 1.5rem;
}

.b2s01k01n04-ripple-timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0.5rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--neon-cyan);
    border: 2px solid var(--dark-bg);
}

.b2s01k01n04-ripple-timeline-item h4 {
    font-size: 1rem;
    color: var(--neon-cyan);
    margin-bottom: 0.5rem;
}

/* === Trust Badges === */
.b2s01k01n04-ripple-trust-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    padding: 2rem 0;
}

.b2s01k01n04-ripple-badge {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background: var(--dark-surface);
    border: 1px solid rgba(0, 255, 200, 0.15);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* === Article Page === */
.b2s01k01n04-ripple-article-header {
    padding: 3rem 0 2rem;
}

.b2s01k01n04-ripple-article-header h1 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    margin-bottom: 1rem;
}

.b2s01k01n04-ripple-article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.b2s01k01n04-ripple-article-body {
    max-width: 800px;
    font-size: 1.05rem;
    line-height: 1.9;
}

.b2s01k01n04-ripple-article-body p {
    margin-bottom: 1.5rem;
}

.b2s01k01n04-ripple-article-body h2 {
    font-size: 1.5rem;
    margin: 2.5rem 0 1rem;
    padding-left: 1rem;
    border-left: 3px solid var(--neon-cyan);
}

.b2s01k01n04-ripple-article-body h3 {
    font-size: 1.25rem;
    margin: 2rem 0 0.75rem;
}

/* === Form === */
.b2s01k01n04-ripple-form-group {
    margin-bottom: 1.5rem;
}

.b2s01k01n04-ripple-form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.b2s01k01n04-ripple-form-group input,
.b2s01k01n04-ripple-form-group textarea,
.b2s01k01n04-ripple-form-group select {
    width: 100%;
    padding: 0.85rem 1.25rem;
    background: var(--dark-surface);
    border: 1px solid rgba(0, 255, 200, 0.2);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.25s;
}

.b2s01k01n04-ripple-form-group input:focus,
.b2s01k01n04-ripple-form-group textarea:focus {
    outline: none;
    border-color: var(--neon-cyan);
}

/* === Responsive === */
@media (max-width: 480px) {
    .b2s01k01n04-ripple-hero {
        min-height: 70vh;
    }

    .b2s01k01n04-ripple-section {
        padding: 3rem 0;
    }

    .b2s01k01n04-ripple-card {
        padding: 1.5rem;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .b2s01k01n04-ripple-hero {
        min-height: 75vh;
    }
}

@media (min-width: 769px) and (max-width: 992px) {
    .b2s01k01n04-ripple-hero {
        min-height: 80vh;
    }
}

/* === Utility === */
.b2s01k01n04-ripple-text-gradient {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.b2s01k01n04-ripple-neon-border {
    border: 1px solid var(--border-glow);
    box-shadow: var(--shadow-neon);
}

.b2s01k01n04-ripple-mt-section {
    margin-top: 72px;
}