/* ========================================
   事实索引与更正档案馆 - 主样式表
   前缀: b2s01k01n01-prism-
   风格: 杂志化胶片颗粒封面，潮流先锋
   ======================================== */

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

:root {
    --b2s01k01n01-prism-primary: #1a2332;
    --b2s01k01n01-prism-secondary: #2d3748;
    --b2s01k01n01-prism-accent: #4a90d9;
    --b2s01k01n01-prism-accent-light: #63b3ed;
    --b2s01k01n01-prism-gold: #d4a853;
    --b2s01k01n01-prism-text: #2d3748;
    --b2s01k01n01-prism-text-light: #718096;
    --b2s01k01n01-prism-bg: #f7fafc;
    --b2s01k01n01-prism-white: #ffffff;
    --b2s01k01n01-prism-border: #e2e8f0;
    --b2s01k01n01-prism-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    --b2s01k01n01-prism-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --b2s01k01n01-prism-radius: 8px;
    --b2s01k01n01-prism-font: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
    font-family: var(--b2s01k01n01-prism-font);
    color: var(--b2s01k01n01-prism-text);
    background-color: var(--b2s01k01n01-prism-bg);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: var(--b2s01k01n01-prism-accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--b2s01k01n01-prism-accent-light);
}

/* ======== Header & Navigation ======== */
.b2s01k01n01-prism-header {
    background: var(--b2s01k01n01-prism-primary);
    padding: 0;
    position: relative;
    z-index: 100;
}

.b2s01k01n01-prism-header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
}

.b2s01k01n01-prism-logo {
    display: flex;
    align-items: center;
}

.b2s01k01n01-prism-logo img {
    height: 40px;
    width: auto;
}

.b2s01k01n01-prism-nav-list {
    display: flex;
    list-style: none;
    gap: 0;
}

.b2s01k01n01-prism-nav-item {
    position: relative;
}

.b2s01k01n01-prism-link-element {
    display: block;
    padding: 10px 18px;
    color: #e2e8f0;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    border-radius: var(--b2s01k01n01-prism-radius);
}

.b2s01k01n01-prism-link-element:hover,
.b2s01k01n01-prism-link-element.active {
    color: var(--b2s01k01n01-prism-gold);
    background: rgba(255,255,255,0.05);
}

.b2s01k01n01-prism-mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: #e2e8f0;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
}

/* ======== Hero / Banner ======== */
.b2s01k01n01-prism-hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--b2s01k01n01-prism-primary);
}

.b2s01k01n01-prism-hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.4;
}

.b2s01k01n01-prism-hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26,35,50,0.85) 0%, rgba(45,55,72,0.7) 100%);
}

.b2s01k01n01-prism-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 40px 20px;
    max-width: 800px;
}

.b2s01k01n01-prism-hero-content h1 {
    font-size: 2.8rem;
    color: #ffffff;
    margin-bottom: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.b2s01k01n01-prism-hero-content p {
    font-size: 1.2rem;
    color: #cbd5e0;
    margin-bottom: 30px;
    line-height: 1.8;
}

.b2s01k01n01-prism-cta-btn {
    display: inline-block;
    padding: 14px 36px;
    background: var(--b2s01k01n01-prism-gold);
    color: var(--b2s01k01n01-prism-primary);
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--b2s01k01n01-prism-radius);
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.b2s01k01n01-prism-cta-btn:hover {
    background: #e6b85a;
    transform: translateY(-2px);
    box-shadow: var(--b2s01k01n01-prism-shadow-lg);
    color: var(--b2s01k01n01-prism-primary);
}

.b2s01k01n01-prism-cta-btn-outline {
    display: inline-block;
    padding: 14px 36px;
    background: transparent;
    color: #ffffff;
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--b2s01k01n01-prism-radius);
    border: 2px solid rgba(255,255,255,0.5);
    transition: all 0.3s ease;
    cursor: pointer;
    margin-left: 15px;
}

.b2s01k01n01-prism-cta-btn-outline:hover {
    border-color: #ffffff;
    color: #ffffff;
    background: rgba(255,255,255,0.1);
}

/* ======== Sections ======== */
.b2s01k01n01-prism-section {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.b2s01k01n01-prism-section-alt {
    background: var(--b2s01k01n01-prism-white);
    padding: 80px 20px;
}

.b2s01k01n01-prism-section-alt .b2s01k01n01-prism-section-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.b2s01k01n01-prism-section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--b2s01k01n01-prism-primary);
    margin-bottom: 15px;
    text-align: center;
}

.b2s01k01n01-prism-section-subtitle {
    font-size: 1.05rem;
    color: var(--b2s01k01n01-prism-text-light);
    text-align: center;
    margin-bottom: 50px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ======== Grid Layouts ======== */
.b2s01k01n01-prism-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.b2s01k01n01-prism-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.b2s01k01n01-prism-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

/* ======== Cards ======== */
.b2s01k01n01-prism-card {
    background: var(--b2s01k01n01-prism-white);
    border-radius: var(--b2s01k01n01-prism-radius);
    overflow: hidden;
    box-shadow: var(--b2s01k01n01-prism-shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--b2s01k01n01-prism-border);
}

.b2s01k01n01-prism-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--b2s01k01n01-prism-shadow-lg);
}

.b2s01k01n01-prism-card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.b2s01k01n01-prism-card-body {
    padding: 25px;
}

.b2s01k01n01-prism-card-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--b2s01k01n01-prism-primary);
    margin-bottom: 10px;
}

.b2s01k01n01-prism-card-text {
    font-size: 0.95rem;
    color: var(--b2s01k01n01-prism-text-light);
    line-height: 1.7;
}

.b2s01k01n01-prism-card-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 15px;
    font-size: 0.85rem;
    color: var(--b2s01k01n01-prism-text-light);
}

/* ======== Video Section ======== */
.b2s01k01n01-prism-video-wrapper {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    border-radius: var(--b2s01k01n01-prism-radius);
    overflow: hidden;
    box-shadow: var(--b2s01k01n01-prism-shadow-lg);
}

.b2s01k01n01-prism-video-wrapper video {
    width: 100%;
    display: block;
}

/* ======== Interactive Tool ======== */
.b2s01k01n01-prism-tool-box {
    background: var(--b2s01k01n01-prism-white);
    border: 2px solid var(--b2s01k01n01-prism-accent);
    border-radius: var(--b2s01k01n01-prism-radius);
    padding: 40px;
    max-width: 700px;
    margin: 0 auto;
}

.b2s01k01n01-prism-tool-box h3 {
    font-size: 1.4rem;
    color: var(--b2s01k01n01-prism-primary);
    margin-bottom: 20px;
    text-align: center;
}

.b2s01k01n01-prism-form-group {
    margin-bottom: 20px;
}

.b2s01k01n01-prism-form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--b2s01k01n01-prism-text);
}

.b2s01k01n01-prism-form-input,
.b2s01k01n01-prism-form-textarea,
.b2s01k01n01-prism-form-select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--b2s01k01n01-prism-border);
    border-radius: var(--b2s01k01n01-prism-radius);
    font-size: 1rem;
    font-family: var(--b2s01k01n01-prism-font);
    transition: border-color 0.3s ease;
    background: var(--b2s01k01n01-prism-white);
}

.b2s01k01n01-prism-form-input:focus,
.b2s01k01n01-prism-form-textarea:focus,
.b2s01k01n01-prism-form-select:focus {
    outline: none;
    border-color: var(--b2s01k01n01-prism-accent);
    box-shadow: 0 0 0 3px rgba(74,144,217,0.1);
}

.b2s01k01n01-prism-form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* ======== FAQ ======== */
.b2s01k01n01-prism-faq-item {
    background: var(--b2s01k01n01-prism-white);
    border: 1px solid var(--b2s01k01n01-prism-border);
    border-radius: var(--b2s01k01n01-prism-radius);
    margin-bottom: 15px;
    overflow: hidden;
}

.b2s01k01n01-prism-faq-question {
    padding: 20px 25px;
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--b2s01k01n01-prism-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease;
}

.b2s01k01n01-prism-faq-question:hover {
    background: rgba(74,144,217,0.05);
}

.b2s01k01n01-prism-faq-answer {
    padding: 0 25px 20px;
    color: var(--b2s01k01n01-prism-text-light);
    line-height: 1.8;
}

/* ======== Trust / Commercial Section ======== */
.b2s01k01n01-prism-trust-bar {
    background: var(--b2s01k01n01-prism-primary);
    padding: 50px 20px;
    text-align: center;
}

.b2s01k01n01-prism-trust-bar-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 30px;
}

.b2s01k01n01-prism-trust-item {
    color: #ffffff;
    text-align: center;
}

.b2s01k01n01-prism-trust-item .number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--b2s01k01n01-prism-gold);
    display: block;
}

.b2s01k01n01-prism-trust-item .label {
    font-size: 0.9rem;
    color: #a0aec0;
    margin-top: 5px;
}

/* ======== Breadcrumb ======== */
.b2s01k01n01-prism-breadcrumb {
    padding: 15px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.b2s01k01n01-prism-breadcrumb-list {
    display: flex;
    list-style: none;
    gap: 8px;
    font-size: 0.9rem;
}

.b2s01k01n01-prism-breadcrumb-list li::after {
    content: '>';
    margin-left: 8px;
    color: var(--b2s01k01n01-prism-text-light);
}

.b2s01k01n01-prism-breadcrumb-list li:last-child::after {
    content: '';
}

.b2s01k01n01-prism-breadcrumb-list li a {
    color: var(--b2s01k01n01-prism-text-light);
}

.b2s01k01n01-prism-breadcrumb-list li:last-child a {
    color: var(--b2s01k01n01-prism-primary);
    font-weight: 500;
}

/* ======== Article Content ======== */
.b2s01k01n01-prism-article-block {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

.b2s01k01n01-prism-article-block h1 {
    font-size: 2.2rem;
    color: var(--b2s01k01n01-prism-primary);
    margin-bottom: 20px;
    line-height: 1.4;
}

.b2s01k01n01-prism-article-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--b2s01k01n01-prism-border);
    font-size: 0.9rem;
    color: var(--b2s01k01n01-prism-text-light);
}

.b2s01k01n01-prism-article-block p {
    margin-bottom: 20px;
    font-size: 1.05rem;
    line-height: 2;
}

.b2s01k01n01-prism-article-block h2 {
    font-size: 1.5rem;
    color: var(--b2s01k01n01-prism-primary);
    margin: 40px 0 20px;
    padding-left: 15px;
    border-left: 4px solid var(--b2s01k01n01-prism-accent);
}

.b2s01k01n01-prism-article-block h3 {
    font-size: 1.2rem;
    color: var(--b2s01k01n01-prism-secondary);
    margin: 30px 0 15px;
}

/* ======== Footer ======== */
.b2s01k01n01-prism-footer {
    background: var(--b2s01k01n01-prism-primary);
    color: #a0aec0;
    padding: 60px 20px 30px;
}

.b2s01k01n01-prism-footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

.b2s01k01n01-prism-footer-col h4 {
    color: #ffffff;
    font-size: 1.1rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.b2s01k01n01-prism-footer-col ul {
    list-style: none;
}

.b2s01k01n01-prism-footer-col ul li {
    margin-bottom: 10px;
}

.b2s01k01n01-prism-footer-col ul li a {
    color: #a0aec0;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.b2s01k01n01-prism-footer-col ul li a:hover {
    color: var(--b2s01k01n01-prism-gold);
}

.b2s01k01n01-prism-footer-col p {
    font-size: 0.9rem;
    line-height: 1.8;
    margin-bottom: 8px;
}

.b2s01k01n01-prism-footer-bottom {
    max-width: 1200px;
    margin: 40px auto 0;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: 0.85rem;
}

.b2s01k01n01-prism-footer-bottom p {
    margin-bottom: 5px;
}

.b2s01k01n01-prism-social-links {
    display: flex;
    gap: 15px;
    margin-top: 15px;
}

.b2s01k01n01-prism-social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    color: #a0aec0;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.b2s01k01n01-prism-social-links a:hover {
    background: var(--b2s01k01n01-prism-gold);
    color: var(--b2s01k01n01-prism-primary);
}

/* ======== Timeline ======== */
.b2s01k01n01-prism-timeline {
    position: relative;
    padding: 20px 0;
}

.b2s01k01n01-prism-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--b2s01k01n01-prism-border);
    transform: translateX(-50%);
}

.b2s01k01n01-prism-timeline-item {
    position: relative;
    width: 50%;
    padding: 20px 40px;
}

.b2s01k01n01-prism-timeline-item:nth-child(odd) {
    margin-left: 0;
    text-align: right;
}

.b2s01k01n01-prism-timeline-item:nth-child(even) {
    margin-left: 50%;
}

.b2s01k01n01-prism-timeline-item::before {
    content: '';
    position: absolute;
    top: 30px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--b2s01k01n01-prism-accent);
    border: 3px solid var(--b2s01k01n01-prism-white);
    box-shadow: var(--b2s01k01n01-prism-shadow);
}

.b2s01k01n01-prism-timeline-item:nth-child(odd)::before {
    right: -7px;
}

.b2s01k01n01-prism-timeline-item:nth-child(even)::before {
    left: -7px;
}

.b2s01k01n01-prism-timeline-year {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--b2s01k01n01-prism-accent);
    margin-bottom: 8px;
}

.b2s01k01n01-prism-timeline-text {
    font-size: 0.95rem;
    color: var(--b2s01k01n01-prism-text-light);
}

/* ======== Page Header ======== */
.b2s01k01n01-prism-page-header {
    background: linear-gradient(135deg, var(--b2s01k01n01-prism-primary) 0%, var(--b2s01k01n01-prism-secondary) 100%);
    padding: 60px 20px;
    text-align: center;
}

.b2s01k01n01-prism-page-header h1 {
    font-size: 2.2rem;
    color: #ffffff;
    margin-bottom: 15px;
}

.b2s01k01n01-prism-page-header p {
    color: #cbd5e0;
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ======== Responsive Design ======== */
@media (max-width: 1200px) {
    .b2s01k01n01-prism-grid-4 {
        grid-template-columns: repeat(3, 1fr);
    }
    .b2s01k01n01-prism-footer-inner {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .b2s01k01n01-prism-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    .b2s01k01n01-prism-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .b2s01k01n01-prism-hero-content h1 {
        font-size: 2.2rem;
    }
    .b2s01k01n01-prism-section {
        padding: 60px 20px;
    }
    .b2s01k01n01-prism-timeline::before {
        left: 20px;
    }
    .b2s01k01n01-prism-timeline-item {
        width: 100%;
        padding-left: 50px;
        text-align: left;
    }
    .b2s01k01n01-prism-timeline-item:nth-child(odd) {
        text-align: left;
    }
    .b2s01k01n01-prism-timeline-item:nth-child(even) {
        margin-left: 0;
    }
    .b2s01k01n01-prism-timeline-item::before {
        left: 13px !important;
        right: auto !important;
    }
}

@media (max-width: 768px) {
    .b2s01k01n01-prism-nav-list {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--b2s01k01n01-prism-primary);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--b2s01k01n01-prism-shadow-lg);
    }
    .b2s01k01n01-prism-nav-list.active {
        display: flex;
    }
    .b2s01k01n01-prism-mobile-toggle {
        display: block;
    }
    .b2s01k01n01-prism-grid-3,
    .b2s01k01n01-prism-grid-2 {
        grid-template-columns: 1fr;
    }
    .b2s01k01n01-prism-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .b2s01k01n01-prism-hero {
        min-height: 400px;
    }
    .b2s01k01n01-prism-hero-content h1 {
        font-size: 1.8rem;
    }
    .b2s01k01n01-prism-hero-content p {
        font-size: 1rem;
    }
    .b2s01k01n01-prism-section-title {
        font-size: 1.6rem;
    }
    .b2s01k01n01-prism-footer-inner {
        grid-template-columns: 1fr;
    }
    .b2s01k01n01-prism-trust-bar-inner {
        flex-direction: column;
        gap: 20px;
    }
    .b2s01k01n01-prism-cta-btn-outline {
        margin-left: 0;
        margin-top: 10px;
    }
    .b2s01k01n01-prism-article-block h1 {
        font-size: 1.6rem;
    }
    .b2s01k01n01-prism-page-header h1 {
        font-size: 1.7rem;
    }
}

@media (max-width: 480px) {
    .b2s01k01n01-prism-grid-4 {
        grid-template-columns: 1fr;
    }
    .b2s01k01n01-prism-hero {
        min-height: 350px;
    }
    .b2s01k01n01-prism-hero-content h1 {
        font-size: 1.5rem;
    }
    .b2s01k01n01-prism-section {
        padding: 40px 15px;
    }
    .b2s01k01n01-prism-card-body {
        padding: 18px;
    }
    .b2s01k01n01-prism-tool-box {
        padding: 25px 15px;
    }
}

/* ======== Utility Classes ======== */
.b2s01k01n01-prism-text-center {
    text-align: center;
}

.b2s01k01n01-prism-mt-30 {
    margin-top: 30px;
}

.b2s01k01n01-prism-mb-30 {
    margin-bottom: 30px;
}

/* ======== Film Grain Effect ======== */
.b2s01k01n01-prism-grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.03;
    z-index: 9999;
    background-image: url('../images/film-grain-texture.webp');
    background-repeat: repeat;
}

/* ======== Related Posts ======== */
.b2s01k01n01-prism-related {
    margin-top: 50px;
    padding-top: 40px;
    border-top: 1px solid var(--b2s01k01n01-prism-border);
}

.b2s01k01n01-prism-related h3 {
    font-size: 1.3rem;
    color: var(--b2s01k01n01-prism-primary);
    margin-bottom: 25px;
}

/* ======== Author Box ======== */
.b2s01k01n01-prism-author-box {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 25px;
    background: var(--b2s01k01n01-prism-bg);
    border-radius: var(--b2s01k01n01-prism-radius);
    margin: 40px 0;
}

.b2s01k01n01-prism-author-box img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}

.b2s01k01n01-prism-author-info h4 {
    font-size: 1rem;
    color: var(--b2s01k01n01-prism-primary);
    margin-bottom: 5px;
}

.b2s01k01n01-prism-author-info p {
    font-size: 0.85rem;
    color: var(--b2s01k01n01-prism-text-light);
    margin: 0;
}

/* ======== Map Container ======== */
.b2s01k01n01-prism-map-container {
    width: 100%;
    height: 350px;
    border-radius: var(--b2s01k01n01-prism-radius);
    overflow: hidden;
    border: 1px solid var(--b2s01k01n01-prism-border);
    background: #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--b2s01k01n01-prism-text-light);
    font-size: 1rem;
}