```css
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@600;700;900&display=swap');

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

body {
    font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', 'Noto Serif SC', sans-serif;
    overflow-x: hidden;
    background: #F9F6F0;
    color: #1A1A1A;
    line-height: 1.6;
}

/* ========== 核心布局 ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
    position: relative;
}

.section:nth-child(even) {
    background: #F0EBE2;
}

/* ========== 导航 ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(249, 246, 240, 0.96);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid #E0D8CC;
    box-shadow: 0 2px 12px rgba(26, 26, 26, 0.04);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 900;
    font-size: 1.25rem;
    text-decoration: none;
    color: #1A1A1A;
    letter-spacing: -0.5px;
}

.logo-icon {
    width: 38px;
    height: 38px;
    border-radius: 4px;
    background: #D7263D;
    color: #F9F6F0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 900;
    box-shadow: 2px 2px 0 rgba(26, 26, 26, 0.15);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}

.main-nav a {
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    color: #1A1A1A;
    letter-spacing: 0.5px;
    position: relative;
    padding: 4px 0;
    transition: color 0.2s;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: #D7263D;
    transition: width 0.3s ease;
}

.main-nav a:hover {
    color: #D7263D;
}

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

.nav-cta {
    padding: 8px 22px;
    border-radius: 4px;
    background: #D7263D;
    color: #F9F6F0 !important;
    font-weight: 700;
    box-shadow: 0 3px 12px rgba(215, 38, 61, 0.35);
    transition: transform 0.2s, box-shadow 0.2s !important;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 16px rgba(215, 38, 61, 0.4);
}

.nav-cta::after {
    display: none;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #1A1A1A;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
}

/* ========== Hero ========== */
.hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: #F9F6F0;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(26, 26, 26, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(26, 26, 26, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.hero::after {
    content: '深潜';
    position: absolute;
    right: 3%;
    bottom: 5%;
    font-size: 14rem;
    font-weight: 900;
    font-family: 'Noto Serif SC', serif;
    color: rgba(26, 26, 26, 0.04);
    transform: rotate(-8deg);
    letter-spacing: -10px;
    line-height: 1;
    pointer-events: none;
    z-index: 0;
}

.hero .container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 48px;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 720px;
    flex: 1 1 480px;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 6px 18px;
    border-radius: 2px;
    margin-bottom: 20px;
    background: #D7263D;
    color: #F9F6F0;
    letter-spacing: 3px;
    transform: rotate(-2deg);
    box-shadow: 2px 2px 0 rgba(26, 26, 26, 0.2);
    text-transform: uppercase;
}

.hero h1 {
    font-size: 3.4rem;
    font-weight: 900;
    line-height: 1.08;
    margin-bottom: 20px;
    letter-spacing: -2px;
    font-family: 'Noto Serif SC', serif;
}

.hero h1 .highlight {
    color: #D7263D;
    position: relative;
    display: inline-block;
}

.hero h1 .highlight::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    width: 100%;
    height: 10px;
    background: rgba(215, 38, 61, 0.18);
    z-index: -1;
    border-radius: 2px;
}

.hero p {
    font-size: 1.05rem;
    opacity: 0.65;
    max-width: 560px;
    margin-bottom: 32px;
    line-height: 1.8;
}

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

.hero-image {
    flex: 1 1 360px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 6px 6px 0 rgba(26, 26, 26, 0.1);
    border: 1px solid #E0D8CC;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 30px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn-primary {
    background: #D7263D;
    color: #F9F6F0 !important;
    box-shadow: 3px 3px 0 rgba(26, 26, 26, 0.15);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 5px 5px 0 rgba(26, 26, 26, 0.15);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid #1A1A1A;
    color: #1A1A1A !important;
}

.btn-outline:hover {
    border-color: #D7263D;
    color: #D7263D !important;
    background: rgba(215, 38, 61, 0.04);
}

/* ========== 标签 / 标题 ========== */
.section-label {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 3px;
    margin-bottom: 12px;
    color: #D7263D;
    text-transform: uppercase;
    position: relative;
    padding-left: 16px;
}

.section-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 2px;
    background: #D7263D;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -1px;
    font-family: 'Noto Serif SC', serif;
    line-height: 1.2;
}

.section-desc {
    max-width: 600px;
    opacity: 0.65;
    margin-bottom: 40px;
    line-height: 1.7;
}

/* ========== 卡片网格 ========== */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

.category-card {
    border-radius: 6px;
    padding: 28px;
    border: 1px solid #E0D8CC;
    background: #FFFFFF;
    position: relative;
    transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: #D7263D;
    opacity: 0;
    transition: opacity 0.25s;
}

.category-card::after {
    content: '▣';
    position: absolute;
    right: 16px;
    bottom: 12px;
    font-size: 2.2rem;
    color: rgba(26, 26, 26, 0.05);
    transition: color 0.25s, transform 0.25s;
}

.category-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(26, 26, 26, 0.08);
    border-color: rgba(215, 38, 61, 0.4);
}

.category-card:hover::before {
    opacity: 1;
}

.category-card:hover::after {
    color: rgba(215, 38, 61, 0.15);
    transform: scale(1.1);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: 4px;
    background: #F0EBE2;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 1.3rem;
    color: #D7263D;
    border: 1px solid rgba(215, 38, 61, 0.15);
}

.category-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.category-card p {
    font-size: 0.85rem;
    opacity: 0.65;
    line-height: 1.6;
    margin-bottom: 16px;
}

.card-link {
    font-weight: 700;
    font-size: 0.82rem;
    text-decoration: none;
    color: #D7263D;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: gap 0.2s;
}

.card-link:hover {
    gap: 8px;
}

/* ========== 特性块 ========== */
.feature-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}

.feature-image {
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 5px 5px 0 rgba(26, 26, 26, 0.08);
    border: 1px solid #E0D8CC;
}

.feature-image img {
    width: 100%;
    height: auto;
    display: block;
}

.feature-text {}

.feature-text h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    font-family: 'Noto Serif SC', serif;
}

.feature-text p {
    opacity: 0.65;
    line-height: 1.7;
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    font-size: 0.95rem;
}

.feature-list li::before {
    content: '✓';
    font-weight: 900;
    color: #D7263D;
    font-size: 0.9rem;
}

/* ========== 数据条 ========== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 28px 20px;
    border-radius: 6px;
    border: 1px solid #E0D8CC;
    background: #FFFFFF;
    position: relative;
    transition: box-shadow 0.25s;
}

.stat-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: #D7263D;
    transition: width 0.3s ease;
}

.stat-item:hover {
    box-shadow: 0 4px 16px rgba(26, 26, 26, 0.05);
}

.stat-item:hover::after {
    width: 70%;
}

.stat-number {
    font-size: 2.4rem;
    font-weight: 900;
    color: #D7263D;
    line-height: 1.2;
    font-family: 'Noto Serif SC', serif;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.55;
    margin-top: 6px;
    letter-spacing: 1px;
}

/* ========== 内容墙 ========== */
.content-wall {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.content-wall-item {
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid #E0D8CC;
    transition: transform 0.25s, box-shadow 0.25s;
    background: #FFFFFF;
    position: relative;
}

.content-wall-item::after {
    content: 'NO.' attr(data-index);
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 0.7rem;
    font-weight: 700;
    color: #D7263D;
    background: rgba(249, 246, 240, 0.9);
    padding: 2px 8px;
    border-radius: 2px;
    letter-spacing: 1px;
    border: 1px solid rgba(215, 38, 61, 0.3);
}

.content-wall-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(26, 26, 26, 0.08);
}

.content-wall-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.content-wall-body {
    padding: 20px;
}

.content-wall-body h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}

.content-wall-body p {
    font-size: 0.85rem;
    opacity: 0.6;
    line-height: 1.6;
}

/* ========== FAQ ========== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid #E0D8CC;
    border-radius: 4px;
    margin-bottom: 10px;
    overflow: hidden;
    cursor: pointer;
    background: #FFFFFF;
    transition: border-color 0.2s;
}

.faq-item:hover {
    border-color: rgba(215, 38, 61, 0.3);
}

.faq-item .faq-question {
    padding: 18px 22px;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
    transition: background 0.2s;
}

.faq-item .faq-question::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 400;
    color: #D7263D;
    transition: transform 0.3s ease;
    line-height: 1;
}

.faq-item.open .faq-question {
    background: #F9F6F0;
}

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

.faq-item .faq-answer {
    padding: 0 22px 18px;
    display: none;
    opacity: 0.65;
    line-height: 1.7;
    font-size: 0.9rem;
}

.faq-item.open .faq-answer {
    display: block;
}

/* ========== CTA ========== */
.cta-banner {
    padding: 60px 24px;
    text-align: center;
    border-radius: 6px;
    background: #D7263D;
    color: #F9F6F0;
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '⚠';
    position: absolute;
    right: -15px;
    top: -15px;
    font-size: 8rem;
    opacity: 0.12;
    transform: rotate(15deg);
    line-height: 1;
}

.cta-banner::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 4px;
    background: rgba(26, 26, 26, 0.15);
}

.cta-banner h2 {
    font-size: 2rem;
    font-weight: 800;
    color: #F9F6F0 !important;
    margin-bottom: 12px;
    font-family: 'Noto Serif SC', serif;
    letter-spacing: -1px;
}

.cta-banner p {
    color: rgba(249, 246, 240, 0.8);
    margin-bottom: 24px;
    font-size: 0.95rem;
}

.cta-banner .btn-primary {
    background: #F9F6F0;
    color: #D7263D !important;
    box-shadow: 3px 3px 0 rgba(26, 26, 26, 0.2);
}

.cta-banner .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 5px 5px 0 rgba(26, 26, 26, 0.2);
}

/* ========== 页脚 ========== */
.site-footer {
    padding: 56px 0 28px;
    background: #F0EBE2;
    color: #1A1A1A;
    border-top: 1px solid #E0D8CC;
}

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

.footer-brand .logo {
    color: #1A1A1A;
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 0.85rem;
    opacity: 0.6;
    line-height: 1.7;
    max-width: 260px;
}

.footer-col h4 {
    color: #1A1A1A;
    margin-bottom: 14px;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 1px;
    position: relative;
    padding-bottom: 8px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: #D7263D;
}

.footer-col a {
    color: rgba(26, 26, 26, 0.65);
    text-decoration: none;
    display: block;
    padding: 4px 0;
    font-size: 0.85rem;
    transition: color 0.2s, padding-left 0.2s;
}

.footer-col a:hover {
    color: #D7263D;
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid rgba(26, 26, 26, 0.08);
    margin-top: 40px;
    padding-top: 20px;
    text-align: center;
    font-size: 0.8rem;
    color: rgba(26, 26, 26, 0.5);
}

/* ========== 工具类 ========== */
.text-accent {
    color: #D7263D;
}

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

.seo-description {
    max-width: 600px;
    margin: 0 auto 48px;
    opacity: 0.65;
    line-height: 1.7;
    text-align: center;
}

.mt-0 {
    margin-top: 0;
}

.mb-0 {
    margin-bottom: 0;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.8rem;
    }

    .hero::after {
        font-size: 10rem;
    }
}

@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding: 120px 0 60px;
    }

    .hero .container {
        flex-direction: column;
    }

    .hero-content {
        flex: 1 1 auto;
    }

    .hero h1 {
        font-size: 2.4rem;
    }

    .hero::after {
        font-size: 6rem;
        right: 10%;
        bottom: auto;
        top: 80px;
    }

    .hero-image {
        flex: 1 1 auto;
        width: 100%;
    }

    .feature-block {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        width: 100%;
        background: #F9F6F0;
        padding: 24px;
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        border-bottom: 1px solid #E0D8CC;
        box-shadow: 0 8px 24px rgba(26, 26, 26, 0.06);
    }

    .main-nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 68px;
        left: 0;
        width: 100%;
        background: #F9F6F0;
        padding: 24px;
        border-bottom: 1px solid #E0D8CC;
        box-shadow: 0 8px 24px rgba(26, 26, 26, 0.06);
    }

    .main-nav a::after {
        display: none;
    }

    .nav-cta {
        align-self: flex-start;
        padding: 10px 24px;
    }

    .menu-toggle {
        display: flex;
    }

    .section {
        padding: 56px 0;
    }

    .section-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    .cards-grid,
    .content-wall,
    .stats-bar {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .cta-banner {
        padding: 40px 20px;
    }

    .cta-banner h2 {
        font-size: 1.5rem;
    }

    .stat-number {
        font-size: 1.8rem;
    }

    .logo {
        font-size: 1.1rem;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }
}