/*
 * 文件名: style.css
 * 项目: 青岛德利兴高新材料有限公司 官方网站
 * 描述: 网站全局样式表，采用现代专业/科技感风格，基于CSS变量和响应式Grid布局。
 */

/* ==========================================================================
   1. CSS 变量系统 (Design Tokens)
   ========================================================================== */
:root {
    /* 色彩系统 */
    --color-primary: #1C2E4A; /* 深石墨蓝，增强辨识度 */
    --color-secondary: #0AA5C2; /* 霜蓝青 */
    --color-accent: #FF8A3D; /* 烈焰橙 */
    --color-dark: #081226;
    --color-light: #FFFFFF;
    --color-gray-dark: #1E2D3F;
    --color-gray-medium: #5E6A85;
    --color-gray-light: #ECF3F8;
    --color-surface: #F4F7FB;
    --color-cta: #19d1c3;
    --gradient-primary: linear-gradient(135deg, #1C2E4A 0%, #0F6AD7 48%, #0AA5C2 100%);
    --gradient-dark: linear-gradient(135deg, #071430, #102347 45%, #0D3E63 100%);
    --gradient-pearl: linear-gradient(120deg, rgba(255, 255, 255, 0.9), rgba(236, 243, 248, 0.95));
    --gradient-cta: linear-gradient(120deg, #FF8A3D 0%, #FFC33E 100%);
    --grid-line: rgba(12, 30, 60, 0.08);

    /* 字体系统 */
    --font-family-main: 'DIN Regular', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    --font-family-heading: 'DIN Alternate', 'Orbitron', 'Microsoft YaHei', sans-serif;
    --font-size-base: 16px;
    --font-size-h1: clamp(2.5rem, 4vw, 3.8rem);
    --font-size-h2: clamp(2rem, 3vw, 3rem);
    --font-size-h3: 1.7rem;
    --font-size-h4: 1.25rem;
    --font-size-small: 0.9rem;

    /* 间距系统 */
    --spacing-unit: 8px;
    --spacing-xs: calc(var(--spacing-unit) * 0.5);
    --spacing-sm: var(--spacing-unit);
    --spacing-md: calc(var(--spacing-unit) * 2);
    --spacing-lg: calc(var(--spacing-unit) * 4);
    --spacing-xl: calc(var(--spacing-unit) * 6);
    --spacing-2xl: calc(var(--spacing-unit) * 10);

    /* 圆角与阴影 */
    --border-radius-sm: 6px;
    --border-radius-md: 14px;
    --border-radius-lg: 24px;
    --border-radius-pill: 999px;
    --shadow-sm: 0 8px 16px rgba(13, 20, 40, 0.06);
    --shadow-md: 0 16px 32px rgba(17, 26, 54, 0.12);
    --shadow-lg: 0 28px 60px rgba(12, 18, 36, 0.18);

    /* 布局 */
    --max-width: 1280px;
    --header-height: 88px;
}

/* ==========================================================================
   2. 全局重置与基础样式
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: var(--font-size-base);
    line-height: 1.6;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-main);
    color: var(--color-gray-dark);
    background-color: var(--color-surface);
    min-height: 100vh;
    background-image: linear-gradient(180deg, rgba(10, 24, 46, 0.02), rgba(10, 24, 46, 0)),
                      radial-gradient(circle at 15% 15%, rgba(255, 138, 61, 0.07), transparent 45%),
                      radial-gradient(circle at 80% 5%, rgba(15, 106, 215, 0.08), transparent 42%);
    background-attachment: fixed;
}

body::before,
body::after {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
}

body::before {
    background-image: linear-gradient(130deg, rgba(10, 165, 194, 0.08), transparent 55%),
                      radial-gradient(circle at 70% 20%, rgba(255, 138, 61, 0.08), transparent 50%);
}

body::after {
    background-image: linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                      linear-gradient(0deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 80px 80px;
    opacity: 0.5;
}

::selection {
    background: var(--color-accent);
    color: var(--color-light);
}

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

a:hover {
    color: var(--color-secondary);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-dark);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

p {
    margin-bottom: var(--spacing-md);
}

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

/* ==========================================================================
   3. 响应式 Grid 布局系统 (Container & Grid)
   ========================================================================== */
.container {
    width: min(100%, var(--max-width));
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
}

.grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr); /* 默认单列 */
    gap: var(--spacing-xl);
}

/* 桌面端 (Desktop) - 1024px 及以上 */
@media (min-width: 1024px) {
    .grid {
        grid-template-columns: repeat(12, 1fr); /* 12列网格 */
    }
    .col-1 { grid-column: span 1; }
    .col-2 { grid-column: span 2; }
    .col-3 { grid-column: span 3; }
    .col-4 { grid-column: span 4; }
    .col-5 { grid-column: span 5; }
    .col-6 { grid-column: span 6; }
    .col-7 { grid-column: span 7; }
    .col-8 { grid-column: span 8; }
    .col-9 { grid-column: span 9; }
    .col-10 { grid-column: span 10; }
    .col-11 { grid-column: span 11; }
    .col-12 { grid-column: span 12; }
}

/* 平板端 (Tablet) - 768px 到 1023px */
@media (min-width: 768px) and (max-width: 1023px) {
    .grid {
        grid-template-columns: repeat(8, 1fr); /* 8列网格 */
        gap: var(--spacing-md);
    }
    .col-md-1 { grid-column: span 1; }
    .col-md-2 { grid-column: span 2; }
    .col-md-3 { grid-column: span 3; }
    .col-md-4 { grid-column: span 4; }
    .col-md-5 { grid-column: span 5; }
    .col-md-6 { grid-column: span 6; }
    .col-md-7 { grid-column: span 7; }
    .col-md-8 { grid-column: span 8; }
}

/* 手机端 (Mobile) - 767px 及以下 */
@media (max-width: 767px) {
    .grid {
        grid-template-columns: repeat(4, 1fr); /* 4列网格 */
        gap: var(--spacing-md);
    }
    .col-sm-1 { grid-column: span 1; }
    .col-sm-2 { grid-column: span 2; }
    .col-sm-3 { grid-column: span 3; }
    .col-sm-4 { grid-column: span 4; }
}

/* ==========================================================================
   4. 导航栏 (Header & Navigation)
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(6, 16, 34, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 18px 60px rgba(5, 10, 20, 0.28);
    z-index: 1000;
    transition: transform 0.3s ease, background 0.3s ease;
}

.header .container {
    width: 100%;
    max-width: none;
    margin-left: 0;
    margin-right: 0;
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    gap: var(--spacing-sm);
    flex-wrap: nowrap;
}

.logo-block {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-light);
    text-transform: none;
    letter-spacing: 0.04em;
    line-height: 1.3;
}


.nav {
    flex: 1 1 auto;
    display: flex;
    justify-content: center;
    min-width: 0;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: nowrap;
}

.nav-item {
    position: relative;
    padding: 0 var(--spacing-sm);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 0 0 auto;
}

.nav-link {
    display: block;
    line-height: calc(var(--header-height) - 24px);
    color: rgba(255, 255, 255, 0.8);
    font-weight: 600;
    padding: 10px 14px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.8rem;
    position: relative;
    border-radius: 999px;
    transition: color 0.3s ease, background 0.3s ease, transform 0.3s ease;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--color-light);
    background: rgba(255, 255, 255, 0.1);
}

.nav-link::after {
    content: '';
    position: absolute;
    inset: auto 16px 10px 16px;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transform: scaleX(0.5);
    transition: all 0.3s ease;
}

.nav-item:hover .nav-link::after,
.nav-link.active::after {
    opacity: 1;
    transform: scaleX(1);
}

/* 二级下拉菜单 */
.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(var(--header-height) - 6px);
    left: 0;
    min-width: 200px;
    background: rgba(6, 14, 30, 0.98);
    box-shadow: 0 30px 80px rgba(2, 5, 12, 0.6);
    list-style: none;
    padding: var(--spacing-sm) 0;
    border-top: 3px solid var(--color-accent);
    z-index: 100;
    border-radius: var(--border-radius-lg);
}

.nav-item:hover > .dropdown-menu {
    display: block;
}

.dropdown-item a {
    padding: var(--spacing-sm) var(--spacing-lg);
    display: block;
    color: rgba(255, 255, 255, 0.8);
    white-space: nowrap;
    font-size: 0.9rem;
}

.dropdown-item a:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-light);
}

/* 移动端菜单按钮 (隐藏在桌面端) */
.menu-toggle {
    display: none;
    cursor: pointer;
    font-size: var(--font-size-h2);
    line-height: 1;
    color: var(--color-light);
}

/* 移动端导航样式 */
@media (max-width: 1023px) {
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: #0f1c34;
        box-shadow: 0 30px 60px rgba(0, 0, 0, 0.45);
        padding-bottom: var(--spacing-md);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-item {
        padding: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .nav-link {
        line-height: 1.5;
        padding: var(--spacing-md) var(--spacing-lg);
        border-radius: 0;
    }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        border-top: none;
        padding: 0;
        background-color: transparent;
    }

    .nav-item:hover > .dropdown-menu {
        display: none; /* 移动端使用JS控制展开 */
    }

    .menu-toggle {
        display: block;
    }

    .header-content {
        flex-wrap: wrap;
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
    }

    .header-actions .btn-ghost,
    .header-actions .btn-cta {
        display: none;
    }
}

@media (max-width: 1280px) and (min-width: 1024px) {
    .btn-ghost { display: none; }
    .nav-link {
        padding: 8px 12px;
        font-size: 0.75rem;
        letter-spacing: 0.03em;
    }
}

.scroll-indicator {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 3px;
    background: rgba(255, 255, 255, 0.08);
    overflow: hidden;
}

.scroll-indicator span {
    display: block;
    height: 100%;
    width: 0;
    background-image: var(--gradient-cta);
}

/* ==========================================================================
   5. 页面内容基础结构
   ========================================================================== */
.main-content {
    padding-top: 0;
    min-height: calc(100vh - 200px);
}

.section {
    padding: var(--spacing-2xl) 0;
    position: relative;
}

.section::after {
    content: '';
    position: absolute;
    inset: var(--spacing-lg) 0 auto 0;
    height: 1px;
    background: linear-gradient(90deg, rgba(12, 30, 60, 0.15), transparent);
    pointer-events: none;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.section-title h2 {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid rgba(10, 165, 194, 0.45);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 14px;
    background: rgba(255, 138, 61, 0.12);
    border-radius: var(--border-radius-pill);
    font-size: 0.82rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

/* ==========================================================================
   6. 设计组件 (Design Components)
   ========================================================================== */
.business-card,
.product-card,
.spec-card,
.application-card,
.case-card,
.career-card,
.news-card {
    background: var(--gradient-pearl);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(28, 46, 74, 0.08);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.business-card:hover,
.product-card:hover,
.spec-card:hover,
.application-card:hover,
.case-card:hover,
.career-card:hover,
.news-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.business-card {
    text-align: left;
}

.business-card .icon {
    width: 72px;
    height: 72px;
    border-radius: 24px;
    background: rgba(10, 165, 194, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.business-card .icon img {
    width: 36px;
    height: 36px;
}

.business-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.stats-grid,
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    text-align: left;
    border-left: 4px solid var(--color-accent);
}

.stat-card h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.product-card,
.spec-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.product-card-img,
.case-card-img {
    border-radius: var(--border-radius-md);
    overflow: hidden;
    max-height: 220px;
}

.product-card-img img,
.case-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.product-card:hover img,
.case-card:hover img {
    transform: scale(1.05);
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.business-grid,
.products-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.mission-section {
    background: linear-gradient(120deg, rgba(28, 46, 74, 0.92), rgba(10, 165, 194, 0.15));
    color: var(--color-light);
}

.mission-header {
    max-width: 720px;
    margin: 0 auto var(--spacing-xl) auto;
    text-align: center;
}

.mission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
}

.mission-card {
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl) var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.18);
    position: relative;
    overflow: hidden;
}

.mission-card::after {
    content: '';
    position: absolute;
    inset: 12px;
    border-radius: inherit;
    border: 1px dashed rgba(255, 255, 255, 0.15);
    pointer-events: none;
}

.mission-card .card-label {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.6);
}

.mission-card h3 {
    margin-top: var(--spacing-md);
    color: var(--color-light);
}

.mission-card p {
    color: rgba(255, 255, 255, 0.8);
}

.mission-card ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
    display: grid;
    gap: var(--spacing-xs);
    color: rgba(255, 255, 255, 0.85);
}

.mission-card li {
    display: flex;
    align-items: center;
}

.mission-card li::before {
    content: '▹';
    color: var(--color-accent);
    margin-right: var(--spacing-xs);
}

.blueprint-section {
    background: var(--color-light);
}

.blueprint-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
}

.blueprint-card {
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(28, 46, 74, 0.08);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    background: var(--color-surface);
}

.blueprint-card .card-label {
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    color: var(--color-secondary);
    text-transform: uppercase;
}

.blueprint-card h3 {
    margin-top: var(--spacing-sm);
}

.blueprint-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.metric-pill {
    padding: 0.4rem 0.9rem;
    border-radius: var(--border-radius-pill);
    background: rgba(10, 165, 194, 0.15);
    color: var(--color-secondary);
    font-size: 0.8rem;
}

.command-center {
    background: var(--gradient-dark);
    color: var(--color-light);
}

.command-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    align-items: stretch;
}

.command-console {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.command-console ul {
    list-style: none;
    padding-left: 0;
    margin: var(--spacing-md) 0;
    display: grid;
    gap: var(--spacing-sm);
}

.command-console li {
    display: flex;
    align-items: center;
}

.command-console li::before {
    content: '▹';
    color: var(--color-accent);
    margin-right: var(--spacing-xs);
}

.command-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
}

.command-stat {
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.command-stat h3 {
    color: var(--color-accent);
}

.command-timeline {
    margin-top: var(--spacing-lg);
    border-left: 2px solid rgba(255, 255, 255, 0.2);
    padding-left: var(--spacing-lg);
    display: grid;
    gap: var(--spacing-md);
}

.timeline-item {
    position: relative;
    padding-left: var(--spacing-md);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -var(--spacing-lg);
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-accent);
}

.timeline-item h4 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-light);
}

.insight-section {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-2xl) var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    background: linear-gradient(135deg, rgba(28, 46, 74, 0.95), rgba(10, 165, 194, 0.85));
    color: var(--color-light);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 30px 80px rgba(5, 10, 20, 0.4);
    position: relative;
    overflow: hidden;
}

.insight-section .section-tag {
    background: rgba(255, 255, 255, 0.18);
    color: var(--color-light);
    letter-spacing: 0.15em;
}

.insight-section::after {
    content: '';
    position: absolute;
    inset: 20px 20px auto auto;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,255,255,0.25), transparent 60%);
    opacity: 0.4;
    pointer-events: none;
}

.insight-head {
    max-width: 780px;
    position: relative;
    z-index: 1;
}

.insight-head p {
    color: rgba(255, 255, 255, 0.9);
}

.insight-section h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-light);
}

.insight-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.insight-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
}

.insight-card h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-light);
}

.insight-card p,
.insight-card li {
    color: rgba(255, 255, 255, 0.85);
}

.insight-card ul {
    padding-left: 1.1rem;
    margin-bottom: 0;
}

.metric-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 4px 10px;
    border-radius: var(--border-radius-pill);
    background: rgba(255, 255, 255, 0.16);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
}

.metric-badge strong {
    font-size: 1.1rem;
    letter-spacing: 0.08em;
}

.insight-actions {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.signal-card {
    background: var(--color-light);
    color: var(--color-gray-dark);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    border: 1px solid rgba(28, 46, 74, 0.08);
}

.signal-card h4 {
    color: var(--color-primary);
}

.signal-group {
    margin-top: var(--spacing-xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.micro-panel {
    position: relative;
    background: linear-gradient(135deg, rgba(48, 63, 159, 0.08), rgba(0, 172, 193, 0.08));
    border: 1px solid rgba(48, 63, 159, 0.1);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    overflow: hidden;
}

.micro-panel::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px),
                      linear-gradient(0deg, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.6;
    pointer-events: none;
}

.application-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.application-card h4 {
    margin: 0;
}

.application-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0 0;
    display: grid;
    gap: var(--spacing-sm);
}

.feature-list li {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
    color: var(--color-gray-dark);
}

.feature-list li::before {
    content: '';
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-secondary);
    margin-top: 4px;
}

.button-group {
    display: inline-flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    align-items: center;
}

.application-badge {
    padding: 4px 12px;
    border-radius: var(--border-radius-pill);
    background: rgba(0, 172, 193, 0.12);
    color: var(--color-secondary);
    font-size: 0.85rem;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-md);
}

.partner-card,
.partner-logo {
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(48, 63, 159, 0.2);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--color-gray-medium);
    transition: border-color 0.3s ease, color 0.3s ease;
}

.partner-card:hover,
.partner-logo:hover {
    border-color: var(--color-secondary);
    color: var(--color-primary);
}

.news-item {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(17, 26, 54, 0.08);
    margin-bottom: var(--spacing-lg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background: var(--color-light);
}

.news-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.news-item-img {
    flex: 0 0 220px;
    overflow: hidden;
    border-radius: var(--border-radius-md);
}

.news-item-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.news-item:hover .news-item-img img {
    transform: scale(1.05);
}

.news-item-content {
    flex: 1;
}

.news-item-content .date {
    font-size: 0.85rem;
    color: var(--color-gray-medium);
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.sidebar {
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(12, 30, 60, 0.08);
    box-shadow: 0 20px 60px rgba(8, 18, 36, 0.1);
}

.sidebar h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    letter-spacing: 0.1em;
}

.sidebar-nav {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.sidebar-nav a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    color: var(--color-gray-dark);
    background: rgba(28, 46, 74, 0.04);
    transition: background 0.3s ease, color 0.3s ease;
}

.sidebar-nav a.active,
.sidebar-nav a:hover {
    background: var(--gradient-primary);
    color: var(--color-light);
}

.content-body h2 {
    margin-top: var(--spacing-xl);
    padding-left: var(--spacing-md);
    border-left: 4px solid var(--color-accent);
    color: var(--color-primary);
}

.content-body img {
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-lg) 0;
    font-size: 0.95rem;
}

th, td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid rgba(17, 26, 54, 0.08);
}

th {
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-medium);
}

.career-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid rgba(17, 26, 54, 0.16);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
}

.contact-form textarea {
    min-height: 160px;
    resize: vertical;
}

.detail-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.detail-header {
    text-align: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(17, 26, 54, 0.1);
    margin-bottom: var(--spacing-xl);
}

.detail-header h1 {
    margin-bottom: var(--spacing-sm);
}

.detail-meta {
    font-size: 0.9rem;
    color: var(--color-gray-medium);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.detail-content {
    line-height: 1.9;
}

.detail-content img {
    display: block;
    margin: var(--spacing-xl) auto;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.detail-content p {
    margin-bottom: var(--spacing-md);
    text-indent: 2em;
}

/* 小组件 */
.chip {
    display: inline-flex;
    padding: 4px 12px;
    border-radius: var(--border-radius-pill);
    background: rgba(255, 255, 255, 0.2);
    color: var(--color-light);
    font-size: 0.8rem;
}

.data-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--border-radius-pill);
    background: rgba(0, 172, 193, 0.12);
    color: var(--color-secondary);
    font-size: 0.85rem;
    letter-spacing: 0.05em;
}

/* ==========================================================================
   7. 底部 (Footer)
   ========================================================================== */
.footer {
    background-color: var(--color-dark);
    color: var(--color-gray-light);
    padding: var(--spacing-xl) 0;
    font-size: var(--font-size-small);
}

.footer a {
    color: var(--color-gray-medium);
}

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

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

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.copyright {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
   8. 辅助类 (Utility Classes)
   ========================================================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.bg-primary { background-color: var(--color-primary); color: var(--color-light); }
.bg-dark { background-color: var(--color-dark); color: var(--color-light); }
.bg-light { background-color: var(--color-light); color: var(--color-dark); }
.bg-gray-light { background-color: var(--color-gray-light); color: var(--color-dark); }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }

.btn {
    display: inline-block;
    padding: 0.85rem 1.8rem;
    border-radius: var(--border-radius-pill);
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    transition: all 0.3s ease;
    border: 1px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background-image: var(--gradient-primary);
    color: var(--color-light);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-light);
    border-color: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(4px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.12);
}

.btn-ghost {
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: var(--color-light);
    padding: 0.6rem 1.3rem;
    border-radius: var(--border-radius-pill);
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    transition: all 0.3s ease;
}

.btn-ghost:hover {
    background-color: rgba(255, 255, 255, 0.12);
}

.btn-cta {
    background-image: var(--gradient-cta);
    color: var(--color-dark);
    padding: 0.6rem 1.3rem;
    border-radius: var(--border-radius-pill);
    font-weight: 700;
    letter-spacing: 0.1em;
    box-shadow: 0 12px 25px rgba(255, 138, 61, 0.35);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 45px rgba(255, 138, 61, 0.35);
}

/* 英雄区/Banner 样式 */
.hero {
    position: relative;
    min-height: calc(100vh - var(--header-height));
    margin-top: var(--header-height);
    display: flex;
    align-items: center;
    background: var(--gradient-dark);
    color: var(--color-light);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.12) 0, transparent 45%),
                      linear-gradient(120deg, rgba(255, 255, 255, 0.05) 0%, transparent 40%);
    opacity: 0.8;
}

.hero .micro-grid {
    position: absolute;
    inset: 20% auto auto 45%;
    width: 700px;
    height: 700px;
    background-image: linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px),
                      linear-gradient(180deg, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    transform: rotate(25deg);
    opacity: 0.6;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-text {
    position: relative;
}

.hero-text h1 {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-h1);
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.hero-text p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-lg);
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.hero-badge {
    padding: 6px 14px;
    border-radius: var(--border-radius-pill);
    border: 1px solid rgba(255, 255, 255, 0.3);
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero-visual {
    position: relative;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow-md);
}

.hero-visual img {
    border-radius: var(--border-radius-md);
    width: 100%;
    box-shadow: var(--shadow-lg);
}

.hero-visual-meta {
    margin-top: var(--spacing-md);
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.5;
}

.hero-stats {
    margin-top: var(--spacing-lg);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

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

.hero-stat h3 {
    font-size: 2.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-secondary);
}

.hero-stat span {
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.65);
}

.hero-materials {
    background: linear-gradient(135deg, #020c1b 0%, #101c3a 45%, #1f3b6d 100%);
}

.hero-command .hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: var(--spacing-2xl);
    align-items: stretch;
    position: relative;
    z-index: 1;
}

.hero-main {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.hero-console {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.hero-eyebrow {
    font-size: 0.85rem;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.65);
}

.hero-command h1 {
    margin-bottom: 0;
}

.hero-lede {
    color: rgba(255, 255, 255, 0.88);
    font-size: 1.05rem;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-actions .btn-secondary {
    border-color: rgba(255, 255, 255, 0.5);
}

.hero-data-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-lg);
}

.hero-data-card {
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-data-card span {
    display: block;
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.7);
}

.hero-data-card h3 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.hero-data-card p {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 0;
}

.hero-panel {
    background: rgba(6, 16, 34, 0.65);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3);
}

.hero-panel h3 {
    color: var(--color-light);
    margin-bottom: var(--spacing-sm);
}

.hero-panel-list {
    list-style: none;
    padding-left: 0;
    margin: 0;
    display: grid;
    gap: var(--spacing-sm);
}

.hero-panel-list li {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
    color: rgba(255, 255, 255, 0.85);
}

.hero-panel-list span {
    font-family: var(--font-family-heading);
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    color: rgba(255, 255, 255, 0.6);
    min-width: 64px;
}

.hero-panel-list strong {
    font-size: 1rem;
    color: var(--color-light);
}

.hero-panel-list p {
    margin: 2px 0 0;
    color: rgba(255, 255, 255, 0.75);
}

.hero-timeline {
    gap: var(--spacing-md);
}

.hero-panel-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.hero-panel-metrics span {
    display: inline-flex;
    justify-content: space-between;
    border-radius: var(--border-radius-pill);
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-light);
    font-size: 0.85rem;
}

.hero-panel .panel-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.75);
    letter-spacing: 0.2em;
    font-size: 0.8rem;
    text-transform: uppercase;
}

.hero-panel strong {
    letter-spacing: 0.1em;
}


@media (max-width: 1023px) {
    .hero-command .hero-grid {
        grid-template-columns: 1fr;
    }
}

/* 内部页面 Banner 样式 */
.page-banner {
    margin-top: var(--header-height);
    padding: var(--spacing-2xl) 0;
    background: var(--gradient-primary);
    color: var(--color-light);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 20% 20%, rgba(255,255,255,0.15), transparent 45%),
                      linear-gradient(120deg, rgba(255,255,255,0.2), transparent 60%);
    opacity: 0.7;
    pointer-events: none;
}

.page-banner h1 {
    color: var(--color-light);
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.page-banner p {
    position: relative;
    z-index: 1;
    color: rgba(255, 255, 255, 0.85);
}

/* 媒体查询优化 */
@media (max-width: 1023px) {
    .hero {
        min-height: auto;
        padding: var(--spacing-2xl) 0;
    }

    .hero-content {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        order: -1;
    }

    .news-item {
        flex-direction: column;
    }

    .news-item-img {
        flex: none;
        width: 100%;
    }
}

@media (max-width: 767px) {
    :root {
        --font-size-h1: 2.1rem;
        --font-size-h2: 1.5rem;
        --font-size-h3: 1.2rem;
        --spacing-lg: calc(var(--spacing-unit) * 3);
    }

    .hero-text p {
        font-size: 1rem;
    }

    .button-group {
        flex-direction: column;
        align-items: stretch;
    }
}