/* ===================================================================
   北京聚达科慧科技有限公司 官网样式表
   包含：首页 (index.html) + 业务介绍 (services.html) + 核心技术 (tech.html) + 关于我们 (about.html) + 法律条款 (terms.html) + 隐私政策 (privacy.html)
   设计风格：高端大气、深色科技质感、不规则不对称栅格布局
=================================================================== */

:root {
    --bg-main: #060a12;
    --bg-card: rgba(15, 23, 42, 0.75);
    --bg-card-hover: rgba(30, 41, 59, 0.85);
    --border-card: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(56, 189, 248, 0.3);

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-blue: #0284c7;
    --accent-cyan: #06b6d4;
    --accent-sky: #38bdf8;
    --accent-glow: rgba(14, 165, 233, 0.15);

    --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", sans-serif;
    --container-width: 1240px;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.6;
}

body {
    position: relative;
    overflow-x: hidden;
    background: radial-gradient(circle at 50% 0%, #0c182e 0%, #060a12 60%);
    min-height: 100vh;
}

/* 动态背景光晕 */
.ambient-glow {
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    filter: blur(120px);
    opacity: 0.35;
}

.glow-1 {
    top: -150px;
    left: 20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, #0284c7, transparent 70%);
}

.glow-2 {
    top: 40%;
    right: -100px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #0369a1, transparent 70%);
}

.glow-3 {
    top: 75%;
    left: -150px;
    width: 550px;
    height: 550px;
    background: radial-gradient(circle, #075985, transparent 70%);
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* 顶部导航栏 */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    background: rgba(6, 10, 18, 0.82);
    border-bottom: 1px solid var(--border-card);
    transition: all 0.3s ease;
}

.header-inner {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 18px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-symbol {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.company-name {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: #ffffff;
}

.company-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
}

.main-nav {
    display: flex;
    gap: 36px;
}

.nav-item {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.25s ease;
    position: relative;
    padding: 6px 0;
}

.nav-item:hover, .nav-item.active-nav {
    color: var(--accent-sky);
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-sky);
    transition: width 0.25s ease;
}

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

/* 详情页顶栏标题区 */
.page-header-section {
    padding: 80px 0 60px;
    border-bottom: 1px solid var(--border-card);
    position: relative;
    z-index: 1;
}

.page-title {
    font-size: 2.8rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 18px;
}

.page-lead {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 800px;
    line-height: 1.8;
}

/* 主视觉区（Hero）：不对称排版 */
.hero-section {
    padding: 90px 0 110px;
    position: relative;
    z-index: 1;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.15fr 0.95fr;
    gap: 48px;
    align-items: center;
}

.hero-content {
    padding-right: 20px;
}

.tag-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.25);
    color: var(--accent-sky);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-sky);
    box-shadow: 0 0 10px var(--accent-sky);
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.01em;
    margin-bottom: 24px;
    color: #ffffff;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 40px;
    max-width: 580px;
}

.hero-stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    border-top: 1px solid var(--border-card);
    padding-top: 32px;
}

.stat-card {
    display: flex;
    flex-direction: column;
}

.stat-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-sky);
    line-height: 1.1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* 主视觉右侧非对称艺术框 */
.hero-visual {
    position: relative;
}

.asymmetric-frame {
    position: relative;
    border-radius: var(--radius-lg);
    padding: 12px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.02));
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.6), 0 0 40px -10px var(--accent-glow);
    transform: perspective(1000px) rotateY(-4deg) rotateX(2deg);
    transition: transform 0.4s ease;
}

.asymmetric-frame:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

/* 本地视觉资源通用样式 */
.image-placeholder {
    width: 100%;
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    background: #090e17;
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.image-placeholder svg {
    display: block;
    width: 100%;
    height: auto;
}

.image-placeholder.has-local-image svg {
    display: none;
}

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

.real-photo {
    object-fit: cover;
    filter: brightness(0.8) saturate(0.78) contrast(1.08);
}

.art-1 .real-photo {
    aspect-ratio: 600 / 420;
}

.detail-placeholder .real-photo {
    aspect-ratio: 540 / 380;
}

.code-placeholder .real-photo {
    aspect-ratio: 540 / 460;
}

.about-large-placeholder .real-photo {
    aspect-ratio: 560 / 340;
}

.mini-placeholder .feature-image {
    height: 110px;
    object-fit: cover;
}

.placeholder-caption {
    padding: 10px 14px;
    font-size: 0.8rem;
    color: var(--text-muted);
    background: rgba(15, 23, 42, 0.9);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: left;
    letter-spacing: 0.02em;
}

/* 浮动装饰小组件 */
.floating-badge {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid var(--border-glow);
    backdrop-filter: blur(12px);
    padding: 14px 18px;
    border-radius: var(--radius-md);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    z-index: 2;
}

.badge-top {
    top: -20px;
    right: -20px;
}

.badge-bottom {
    bottom: -24px;
    left: -20px;
}

.badge-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(14, 165, 233, 0.2);
    color: var(--accent-sky);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.85rem;
}

.floating-badge strong {
    display: block;
    font-size: 0.9rem;
    color: #ffffff;
}

.floating-badge p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0;
}

/* 通用板块与非对称头部 */
.section {
    padding: 100px 0;
    position: relative;
    z-index: 1;
}

.alternate-bg {
    background: rgba(15, 23, 42, 0.35);
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.section-header-asymmetric {
    display: flex;
    align-items: flex-start;
    gap: 36px;
    margin-bottom: 56px;
}

.section-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    border-left: 3px solid var(--accent-sky);
    padding-left: 14px;
    margin-bottom: 16px;
}

.section-serial {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--accent-sky);
    line-height: 1;
}

.section-tag {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.section-title-wrap {
    flex: 1;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    color: #ffffff;
    line-height: 1.3;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.section-lead {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.detail-paragraphs p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 18px;
}

.detail-paragraphs p:last-child {
    margin-bottom: 0;
}

/* 法律条款与隐私政策专用布局 */
.legal-card-wrap {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.legal-clause-block {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 36px 40px;
    transition: all 0.3s ease;
}

.legal-clause-block:hover {
    border-color: var(--border-glow);
    background: var(--bg-card-hover);
}

.clause-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
}

.clause-num {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--accent-sky);
    padding: 4px 10px;
    background: rgba(14, 165, 233, 0.12);
    border-radius: 6px;
    border: 1px solid rgba(56, 189, 248, 0.25);
}

.clause-header h2 {
    font-size: 1.35rem;
    font-weight: 700;
    color: #ffffff;
}

.clause-body p {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 14px;
}

.clause-body p:last-child {
    margin-bottom: 0;
}

/* 板块一：业务介绍 (非对称 Bento 栅格) */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 28px;
}

.bento-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.bento-span-7 {
    grid-column: span 7;
}

.bento-span-5 {
    grid-column: span 5;
}

.bento-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-glow);
    background: var(--bg-card-hover);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5), 0 0 25px -5px var(--accent-glow);
}

.card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.card-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--accent-sky);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-index {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.card-title {
    font-size: 1.55rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 18px;
}

.card-desc {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.card-desc-secondary {
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.card-foot-art {
    margin-top: 24px;
}

.mini-placeholder svg {
    height: 110px;
}

/* 非对称错位双栏 */
.asymmetric-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.reverse-layout {
    grid-template-columns: 1fr 1fr;
}

.reverse-layout .split-col-image {
    order: 1;
}

.reverse-layout .split-col-text {
    order: 2;
}

.split-col-image {
    position: relative;
}

.dev-points {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.dev-point-item {
    display: flex;
    gap: 20px;
    padding: 22px;
    border-radius: var(--radius-md);
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-card);
    transition: all 0.25s ease;
}

.dev-point-item:hover {
    background: rgba(15, 23, 42, 0.9);
    border-color: var(--border-glow);
    transform: translateX(8px);
}

.point-number {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    background: rgba(14, 165, 233, 0.15);
    border: 1px solid rgba(56, 189, 248, 0.3);
    color: var(--accent-sky);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    border-radius: 8px;
    font-size: 0.9rem;
}

.point-content h4 {
    font-size: 1.15rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 8px;
}

.point-content p {
    font-size: 0.94rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* 关于我们独立页特有排版样式 */
.about-hero-card {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 50px;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 48px;
}

.about-rich-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 20px;
}

.about-rich-text:last-child {
    margin-bottom: 0;
}

.principles-tri-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-bottom: 40px;
}

.principle-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    transition: all 0.3s ease;
}

.principle-card:hover {
    border-color: var(--accent-sky);
    background: var(--bg-card-hover);
    transform: translateY(-6px);
}

.principle-number {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--accent-sky);
    margin-bottom: 18px;
    padding-bottom: 6px;
    border-bottom: 2px solid var(--accent-sky);
    display: inline-block;
}

.principle-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 14px;
}

.principle-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

.about-bottom-visual {
    margin-top: 30px;
}

.about-wide-placeholder svg {
    height: auto;
}

/* 板块三：关于我们 (首页简述版) */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 36px;
}

.about-main-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    padding: 42px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: all 0.3s ease;
}

.about-main-card:hover {
    border-color: var(--border-glow);
    background: var(--bg-card-hover);
}

.about-main-card h3 {
    font-size: 1.6rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 24px;
    border-left: 3px solid var(--accent-sky);
    padding-left: 16px;
}

.about-main-card p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 20px;
}

.about-main-card p:last-child {
    margin-bottom: 0;
}

.about-side-cards {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about-feature-box {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 24px 28px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    transition: all 0.25s ease;
}

.about-feature-box:hover {
    border-color: var(--border-glow);
    background: var(--bg-card-hover);
    transform: translateX(6px);
}

.box-num {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: rgba(14, 165, 233, 0.12);
    border: 1px solid rgba(56, 189, 248, 0.25);
    color: var(--accent-sky);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.box-content h4 {
    font-size: 1.15rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 8px;
}

.box-content p {
    font-size: 0.94rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* 精简后的底部页脚样式 */
.site-footer {
    border-top: 1px solid var(--border-card);
    background: #04070d;
    padding: 50px 0 35px;
    position: relative;
    z-index: 1;
}

.footer-simple-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand-info {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.footer-company-name {
    font-size: 1.15rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.05em;
}

.footer-company-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-simple-nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.footer-nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.92rem;
    transition: color 0.2s ease;
}

.footer-nav-link:hover, .footer-nav-link.active-foot-link {
    color: var(--accent-sky);
}

.footer-nav-divider {
    color: rgba(255, 255, 255, 0.15);
    font-size: 0.8rem;
}

/* 标准 ICP 与公安备案样式 */
.footer-records-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 16px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    font-size: 0.85rem;
}

.record-link {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.record-link:hover {
    color: var(--accent-sky);
}

.police-record {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.police-icon {
    width: 15px;
    height: 15px;
    display: inline-block;
    vertical-align: middle;
}

.record-divider {
    color: rgba(255, 255, 255, 0.1);
    font-size: 0.75rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 20px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* 响应式调整 */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
    }
    .asymmetric-frame {
        transform: none;
    }
    .bento-span-7, .bento-span-5 {
        grid-column: span 12;
    }
    .asymmetric-split, .reverse-layout {
        grid-template-columns: 1fr;
    }
    .reverse-layout .split-col-image {
        order: 2;
    }
    .reverse-layout .split-col-text {
        order: 1;
    }
    .about-hero-card {
        grid-template-columns: 1fr;
    }
    .principles-tri-grid {
        grid-template-columns: 1fr;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .footer-simple-content {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
    }
    .hero-title {
        font-size: 2.2rem;
    }
    .page-title {
        font-size: 2.1rem;
    }
    .legal-clause-block {
        padding: 24px 20px;
    }
    .footer-simple-nav {
        flex-wrap: wrap;
        gap: 14px;
    }
    .footer-records-row {
        flex-direction: column;
        gap: 8px;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}