/* ============================================
   中徽机电科技股份有限公司 - 企业资信展示网站
   双主题样式表（亮色/暗色）
   ============================================ */

/* ---------- CSS 变量定义 ---------- */
:root {
    /* 亮色主题（IT之家风格：白底+红点缀） */
    --bg-primary: #ffffff;
    --bg-primary-rgb: 255, 255, 255;
    --bg-secondary: #f5f7fa;
    --bg-tertiary: #eef1f5;
    --bg-card: #ffffff;
    --bg-hover: #f0f2f5;
    
    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --text-muted: #a0aec0;
    
    --accent-primary: #e74c3c;
    --accent-primary-rgb: 231, 76, 60;
    --accent-secondary: #c0392b;
    --accent-light: #fdf2f2;
    
    --border-color: #e2e8f0;
    --border-light: #edf2f7;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.04), 0 4px 6px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.06), 0 10px 10px rgba(0,0,0,0.04);
    
    --gradient-primary: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    --gradient-hero: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-display: 'Times New Roman', 'Source Han Serif SC', 'Noto Serif SC', 'Songti SC', 'STSong', serif;
    --font-mono: 'SF Mono', Monaco, monospace;
    
    --navbar-height: 72px;
    --container-max: 1360px;
    --section-padding: 100px;
}

/* 暗色主题（科技蓝深色风格） */
[data-theme="dark"] {
    --bg-primary: #0a0e1a;
    --bg-primary-rgb: 10, 14, 26;
    --bg-secondary: #111827;
    --bg-tertiary: #1a1f2e;
    --bg-card: #151b2d;
    --bg-hover: #1e2538;
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --text-muted: #475569;
    
    --accent-primary: #3b82f6;
    --accent-primary-rgb: 59, 130, 246;
    --accent-secondary: #2563eb;
    --accent-light: rgba(59, 130, 246, 0.1);
    
    --border-color: #1e293b;
    --border-light: #0f172a;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.3), 0 1px 3px rgba(0,0,0,0.2);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.4), 0 4px 6px rgba(0,0,0,0.2);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.5), 0 10px 10px rgba(0,0,0,0.3);
    
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

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

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6,
strong,
b,
.logo-brand,
.hero-title,
.section-title,
.timeline-title,
.timeline-year,
.stat-num,
.stat-unit,
.info-value,
.credit-grade,
.award-name,
.project-filter,
.hero-signature-item strong,
.qual-summary-card strong,
.project-summary-card strong {
    font-family: var(--font-family-display);
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    font-synthesis-weight: none;
}

.skip-link {
    position: fixed;
    top: 16px;
    left: 16px;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    background: var(--text-primary);
    color: var(--bg-primary);
    z-index: 2000;
    transform: translateY(-160%);
    transition: transform var(--transition-fast);
}

.skip-link:focus-visible {
    transform: translateY(0);
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid rgba(var(--accent-primary-rgb), 0.25);
    outline-offset: 3px;
}

/* ---------- 容器 ---------- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
}

/* ---------- 导航栏 ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(var(--bg-primary-rgb), 0.86);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
}

.logo-rect-1 { fill: var(--accent-primary); opacity: 0.9; }
.logo-rect-2 { fill: var(--accent-primary); opacity: 0.7; }
.logo-rect-3 { fill: var(--accent-primary); opacity: 0.6; }
.logo-rect-4 { fill: var(--accent-primary); opacity: 0.4; }

.logo-text {
    display: flex;
    align-items: center;
    min-width: 0;
}

.logo-brand {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.logo-sub {
    font-size: 11px;
    color: var(--text-tertiary);
    line-height: 1.2;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-primary);
    background: var(--accent-light);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.lang-switcher {
    position: relative;
}

.lang-select {
    min-width: 122px;
    height: 40px;
    padding: 0 34px 0 14px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background:
        linear-gradient(135deg, rgba(var(--bg-primary-rgb), 0.98), rgba(var(--bg-primary-rgb), 0.88));
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-switcher::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 14px;
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: translateY(-70%) rotate(45deg);
    pointer-events: none;
}

.lang-select:hover,
.lang-select:focus {
    outline: none;
    border-color: rgba(var(--accent-primary-rgb), 0.28);
    color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(var(--accent-primary-rgb), 0.08);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    transition: all var(--transition-fast);
    position: relative;
}

.theme-toggle:hover {
    background: var(--bg-hover);
    color: var(--accent-primary);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    position: absolute;
    transition: all var(--transition-normal);
}

.sun-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.moon-icon {
    opacity: 0;
    transform: rotate(90deg) scale(0);
}

[data-theme="dark"] .sun-icon {
    opacity: 0;
    transform: rotate(-90deg) scale(0);
}

[data-theme="dark"] .moon-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

.mobile-toggle {
    display: none;
    width: 40px;
    height: 40px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

/* ---------- Hero 区域 ---------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: var(--navbar-height);
    overflow: hidden;
    background: var(--gradient-hero);
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.4;
}

[data-theme="dark"] .hero-grid {
    background-image: 
        linear-gradient(rgba(59, 130, 246, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.08) 1px, transparent 1px);
    opacity: 1;
}

.hero-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: var(--accent-primary);
    opacity: 0.06;
    filter: blur(100px);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.hero-orbit {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(var(--accent-primary-rgb), 0.16);
    pointer-events: none;
}

.hero-orbit-one {
    width: 720px;
    height: 720px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.8;
}

.hero-orbit-two {
    width: 420px;
    height: 420px;
    top: 48%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-style: dashed;
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1460px;
    padding: 0 24px;
}

.hero-shell {
    display: flex;
    justify-content: center;
    width: 100%;
}

.hero-main {
    text-align: center;
    width: 100%;
    max-width: 1220px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--accent-light);
    border: 1px solid var(--accent-primary);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    color: var(--accent-primary);
    margin-bottom: 32px;
}

.hero-eyebrow {
    margin-bottom: 18px;
    color: var(--text-tertiary);
    font-size: 12px;
    letter-spacing: 0.18em;
    font-weight: 700;
    text-align: center;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-title {
    font-size: clamp(40px, 6.4vw, 72px);
    font-weight: 700;
    line-height: 1.22;
    margin-bottom: 24px;
    letter-spacing: 0.03em;
}

.title-line {
    display: block;
    color: var(--text-primary);
}

.title-line.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 28px;
    max-width: 1040px;
    margin-left: auto;
    margin-right: auto;
}

.hero-highlights {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 42px;
}

.hero-highlight {
    padding: 10px 16px;
    border-radius: 999px;
    background: rgba(var(--bg-primary-rgb), 0.72);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.14);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 12px;
    flex-wrap: wrap;
    width: min(100%, 1120px);
    margin-left: auto;
    margin-right: auto;
    padding: 28px 36px;
    border-radius: 28px;
    background: rgba(var(--bg-primary-rgb), 0.62);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-num {
    font-size: 42px;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1;
    letter-spacing: -0.01em;
}

.stat-unit {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent-primary);
    letter-spacing: 0.04em;
}

.stat-label {
    font-size: 14px;
    color: var(--text-tertiary);
    margin-top: 4px;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.hero-signature-strip {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    width: min(100%, 1320px);
    margin: 24px auto 0;
}

.hero-signature-item {
    padding: 22px 24px;
    border-radius: 22px;
    background: rgba(var(--bg-primary-rgb), 0.68);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    box-shadow: var(--shadow-sm);
    text-align: left;
}

.hero-signature-label {
    display: inline-block;
    margin-bottom: 12px;
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.hero-signature-item strong {
    display: block;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-size: 18px;
    line-height: 1.45;
    font-weight: 600;
    letter-spacing: 0.03em;
}

.hero-signature-item p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(231, 76, 60, 0.35);
}

[data-theme="dark"] .btn-primary {
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.45);
}

[data-theme="dark"] .btn-primary:hover {
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: var(--accent-light);
}

.btn-full {
    width: 100%;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 12px;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: rotate(45deg) translateY(0); }
    40% { transform: rotate(45deg) translateY(8px); }
    60% { transform: rotate(45deg) translateY(4px); }
}

/* ---------- 通用板块样式 ---------- */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section:nth-child(even) {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-note {
    max-width: 860px;
    margin: -28px auto 36px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    color: var(--text-tertiary);
    font-size: 14px;
    line-height: 1.7;
    box-shadow: var(--shadow-sm);
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--accent-light);
    color: var(--accent-primary);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: 0.06em;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 620px;
    margin: 0 auto;
}

/* ---------- 公司简介 ---------- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
    margin-bottom: 80px;
    align-items: stretch;
}

.about-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: all var(--transition-normal);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.info-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
}

.info-icon svg {
    width: 24px;
    height: 24px;
}

.info-label {
    font-size: 13px;
    color: var(--text-tertiary);
}

.info-value {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.03em;
}

.info-note {
    display: block;
    margin-top: 6px;
    font-size: 13px;
    color: var(--text-tertiary);
    line-height: 1.6;
}

.info-card-extended .info-value {
    font-size: 20px;
}

.about-main {
    display: flex;
    flex-direction: column;
    gap: 32px;
    min-height: 100%;
}

.about-text h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: 0.04em;
}

.about-text p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

.culture-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-top: auto;
}

.culture-card h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
    letter-spacing: 0.04em;
}

.culture-items {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.culture-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.culture-label {
    min-width: 60px;
    padding: 4px 12px;
    background: var(--accent-light);
    color: var(--accent-primary);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-align: center;
}

.culture-value {
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
}

/* 发展历程时间线 */
.timeline-section {
    margin-top: 48px;
    padding: 36px;
    border-radius: 28px;
    background: linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.96), rgba(var(--bg-primary-rgb), 0.86));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    box-shadow: var(--shadow-lg);
}

.timeline-head {
    text-align: center;
    margin-bottom: 34px;
}

.timeline-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.05em;
}

.timeline-subtitle {
    max-width: 620px;
    margin: 12px auto 0;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
}

.timeline {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 18px;
    position: relative;
    padding: 30px 0 6px;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 38px;
    left: 8%;
    right: 8%;
    height: 3px;
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(var(--accent-primary-rgb), 0.18), rgba(var(--accent-primary-rgb), 0.55), rgba(var(--accent-primary-rgb), 0.18));
}

.timeline-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    flex: 1;
    position: relative;
    z-index: 1;
}

.timeline-item:nth-child(even) {
    margin-top: 42px;
}

.timeline-dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    border: 4px solid var(--bg-primary);
    box-shadow: 0 0 0 6px rgba(var(--accent-primary-rgb), 0.12);
}

.timeline-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px;
    width: 100%;
    min-height: 148px;
    padding: 24px 18px 22px;
    border-radius: 22px;
    background: rgba(var(--bg-primary-rgb), 0.92);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    box-shadow: var(--shadow-md);
}

.timeline-year {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1;
    letter-spacing: 0.02em;
}

.timeline-label {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--accent-light);
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.timeline-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.timeline-item-featured .timeline-dot {
    box-shadow: 0 0 0 8px rgba(var(--accent-primary-rgb), 0.16);
}

.timeline-item-featured .timeline-content {
    background: linear-gradient(180deg, rgba(var(--accent-primary-rgb), 0.08), rgba(var(--bg-primary-rgb), 0.94));
    border-color: rgba(var(--accent-primary-rgb), 0.16);
    box-shadow: var(--shadow-xl);
}

/* ---------- 资质荣誉 ---------- */
.qual-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.qual-tab {
    --qual-tab-rgb: var(--accent-primary-rgb);
    --qual-tab-solid: var(--accent-primary);
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    background: linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.96), rgba(var(--bg-primary-rgb), 0.88));
    border: 1px solid rgba(var(--qual-tab-rgb), 0.14);
    border-radius: 100px;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.qual-tab[data-tab="grade1"] {
    --qual-tab-rgb: 231, 76, 60;
    --qual-tab-solid: #e74c3c;
    color: #7f3b32;
}

.qual-tab[data-tab="grade2"] {
    --qual-tab-rgb: 100, 116, 139;
    --qual-tab-solid: #64748b;
    color: #536277;
}

.qual-tab[data-tab="other"] {
    --qual-tab-rgb: 124, 58, 237;
    --qual-tab-solid: #7c3aed;
    color: #6243b8;
}

.qual-tab:hover {
    border-color: rgba(var(--qual-tab-rgb), 0.34);
    color: var(--qual-tab-solid);
    transform: translateY(-1px);
}

.qual-tab.active {
    background: linear-gradient(135deg, rgba(var(--qual-tab-rgb), 1), rgba(var(--qual-tab-rgb), 0.82));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 8px 24px rgba(var(--qual-tab-rgb), 0.26);
}

[data-theme="dark"] .qual-tab.active {
    box-shadow: 0 10px 28px rgba(var(--qual-tab-rgb), 0.24);
}

.qual-panel {
    display: none;
}

.qual-panel.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-qualifications {
    overflow: hidden;
}

.section-qualifications::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 10% 15%, rgba(var(--accent-primary-rgb), 0.10), transparent 30%),
        radial-gradient(circle at 90% 20%, rgba(var(--accent-primary-rgb), 0.08), transparent 24%);
    pointer-events: none;
}

.section-qualifications .container {
    position: relative;
    z-index: 1;
}

.qual-showcase {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 24px;
    margin-bottom: 36px;
}

.qual-summary-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.qual-summary-card,
.qual-capability-card {
    background: linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.94), rgba(var(--bg-primary-rgb), 0.82));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.12);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.qual-summary-card {
    padding: 24px;
    border-radius: var(--radius-lg);
}

.qual-summary-label {
    display: inline-block;
    margin-bottom: 14px;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--accent-light);
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.qual-summary-card strong {
    display: block;
    margin-bottom: 10px;
    font-size: 32px;
    line-height: 1;
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: 0.01em;
}

.qual-summary-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 14px;
}

.qual-capability-card {
    padding: 28px;
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.qual-capability-card::after {
    content: '';
    position: absolute;
    inset: auto -30px -40px auto;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(var(--accent-primary-rgb), 0.14), transparent 70%);
    pointer-events: none;
}

.qual-capability-head {
    position: relative;
    z-index: 1;
}

.qual-capability-tag,
.qual-panel-tag {
    display: inline-block;
    margin-bottom: 14px;
    padding: 6px 12px;
    border-radius: 999px;
    border: 1px solid rgba(var(--accent-primary-rgb), 0.14);
    background: rgba(var(--accent-primary-rgb), 0.08);
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.qual-capability-head h3,
.qual-panel-head h3 {
    font-size: 26px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
    letter-spacing: 0.04em;
}

.qual-capability-head p,
.qual-panel-head p {
    margin-top: 10px;
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 14px;
}

.qual-capability-list {
    position: relative;
    z-index: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 22px;
}

.qual-capability-list span {
    padding: 10px 14px;
    border-radius: 999px;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
}

.qual-carousel {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 16px;
    align-items: center;
}

.qual-tabs {
    padding: 8px;
    border-radius: 999px;
    background: rgba(var(--bg-primary-rgb), 0.76);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    box-shadow: var(--shadow-sm);
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.qual-panel {
    margin-top: 28px;
    padding: 32px;
    border-radius: 28px;
    background: linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.96), rgba(var(--bg-primary-rgb), 0.80));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.12);
    box-shadow: var(--shadow-lg);
}

.qual-panel-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 26px;
}

.qual-panel-meta {
    min-width: 140px;
    text-align: right;
}

.qual-panel-total {
    display: block;
    margin-bottom: 8px;
    color: var(--text-tertiary);
    font-size: 13px;
    font-weight: 600;
}

.qual-panel-counter {
    font-size: 30px;
    font-weight: 700;
    line-height: 1;
    color: var(--accent-primary);
    letter-spacing: -0.01em;
}

.qual-viewport {
    overflow: hidden;
}

.qual-track {
    --qual-columns: 3;
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: calc((100% - 20px * (var(--qual-columns) - 1)) / var(--qual-columns));
    gap: 20px;
    transition: transform var(--transition-normal);
    will-change: transform;
}

.qual-nav {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: rgba(var(--bg-primary-rgb), 0.88);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.14);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.qual-nav:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #fff;
}

.qual-nav svg {
    width: 18px;
    height: 18px;
}

.qual-card {
    background:
        linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.98), rgba(var(--bg-primary-rgb), 0.90)),
        var(--bg-card);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    border-radius: 22px;
    padding: 30px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    min-height: 340px;
    display: flex;
    flex-direction: column;
}

.qual-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.qual-card::after {
    content: '';
    position: absolute;
    top: -60px;
    right: -40px;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(var(--accent-primary-rgb), 0.12), transparent 70%);
    pointer-events: none;
}

.qual-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-primary);
}

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

.qual-badge {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-primary);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
}

.qual-badge.secondary {
    background: var(--text-tertiary);
}

.qual-badge.accent {
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
}

.qual-card h4 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.45;
    letter-spacing: 0.03em;
}

.qual-card p {
    font-size: 14px;
    color: var(--text-tertiary);
    line-height: 1.8;
}

.qual-card-copy {
    margin-bottom: 18px;
}

.qual-card-points {
    display: grid;
    gap: 10px;
}

.qual-card-point {
    display: grid;
    gap: 4px;
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(var(--bg-primary-rgb), 0.72);
    border: 1px solid var(--border-light);
}

.qual-card-point span {
    color: var(--text-tertiary);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.03em;
}

.qual-card-point strong {
    color: var(--text-primary);
    font-size: 13px;
    line-height: 1.7;
    font-weight: 600;
}

.qual-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 26px;
}

.qual-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border-color);
    transition: all var(--transition-fast);
}

.qual-dot.active {
    width: 28px;
    border-radius: 999px;
    background: var(--accent-primary);
}

/* ---------- 信用信息 ---------- */
.credit-grid {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
}

.credit-card {
    grid-column: span 3;
    display: grid;
    align-content: start;
    gap: 22px;
    min-height: 320px;
    padding: 30px;
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.96), rgba(var(--bg-primary-rgb), 0.88));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.credit-card.featured {
    grid-column: span 12;
    background:
        radial-gradient(circle at top right, rgba(255, 255, 255, 0.16), transparent 38%),
        linear-gradient(135deg, rgba(var(--accent-primary-rgb), 0.94), var(--accent-secondary));
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: #fff;
    box-shadow: 0 20px 50px rgba(var(--accent-primary-rgb), 0.22);
}

.credit-card.highlight {
    border-color: rgba(var(--accent-primary-rgb), 0.18);
    background: linear-gradient(180deg, rgba(var(--accent-primary-rgb), 0.08), rgba(var(--bg-primary-rgb), 0.95));
}

.credit-card-head {
    display: flex;
    align-items: center;
    gap: 14px;
}

.credit-icon {
    width: 58px;
    height: 58px;
    flex-shrink: 0;
    border-radius: 18px;
    background: rgba(var(--accent-primary-rgb), 0.10);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
}

.credit-card.featured .credit-icon {
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
}

.credit-icon svg {
    width: 30px;
    height: 30px;
}

.credit-card-tag {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 14px;
    border-radius: 999px;
    background: rgba(var(--accent-primary-rgb), 0.08);
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.credit-card.featured .credit-card-tag {
    background: rgba(255, 255, 255, 0.14);
    color: rgba(255, 255, 255, 0.96);
}

.credit-card-body {
    display: grid;
    gap: 12px;
}

.credit-card h4 {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.04em;
}

.credit-grade {
    font-size: 34px;
    font-weight: 800;
    color: var(--accent-primary);
    display: block;
    line-height: 1;
    letter-spacing: -0.02em;
}

.credit-card.featured h4,
.credit-card.featured .credit-grade,
.credit-card.featured .credit-copy {
    color: #fff;
}

.credit-card.featured .credit-grade {
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
}

.credit-copy {
    margin: 0;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.credit-points {
    display: grid;
    gap: 12px;
}

.credit-card.featured .credit-points {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.credit-point {
    display: grid;
    gap: 6px;
    padding: 14px 16px;
    border-radius: 16px;
    background: rgba(var(--bg-primary-rgb), 0.72);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
}

.credit-point span {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--text-tertiary);
}

.credit-point strong {
    font-size: 13px;
    line-height: 1.8;
    font-weight: 600;
    color: var(--text-primary);
}

.credit-card.featured .credit-point {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.16);
}

.credit-card.featured .credit-point span,
.credit-card.featured .credit-point strong {
    color: rgba(255, 255, 255, 0.92);
}

.credit-card.featured .credit-point span {
    color: rgba(255, 255, 255, 0.72);
    letter-spacing: 0.04em;
}

/* ---------- 证书展示 ---------- */
.cert-categories {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.cert-category {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 40px;
}

.cert-cat-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 28px;
    letter-spacing: 0.04em;
}

.cert-cat-title svg {
    width: 24px;
    height: 24px;
    color: var(--accent-primary);
}

.cert-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.cert-category-iso {
    background:
        linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.98), rgba(var(--bg-primary-rgb), 0.94)),
        radial-gradient(circle at top right, rgba(var(--accent-primary-rgb), 0.08), transparent 42%);
}

.cert-list-iso {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.cert-list-iso .cert-item {
    min-height: 188px;
    padding: 28px;
    border: 1px solid rgba(var(--accent-primary-rgb), 0.12);
    background:
        linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.98), rgba(var(--bg-primary-rgb), 0.9)),
        linear-gradient(135deg, rgba(var(--accent-primary-rgb), 0.04), transparent 58%);
    flex-direction: column;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
    position: relative;
    overflow: hidden;
}

.cert-list-iso .cert-item::after {
    content: "";
    position: absolute;
    right: -18px;
    bottom: -20px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(var(--accent-primary-rgb), 0.08), transparent 68%);
    pointer-events: none;
}

.cert-list-iso .cert-item:hover {
    background:
        linear-gradient(180deg, rgba(var(--bg-primary-rgb), 1), rgba(var(--bg-primary-rgb), 0.92)),
        linear-gradient(135deg, rgba(var(--accent-primary-rgb), 0.08), transparent 58%);
    border-color: rgba(var(--accent-primary-rgb), 0.22);
    transform: translateY(-4px);
}

.cert-list-iso .cert-icon {
    width: 64px;
    height: 64px;
    border-radius: 18px;
    box-shadow: 0 18px 34px rgba(var(--accent-primary-rgb), 0.16);
}

.cert-list-iso .cert-info {
    position: relative;
    z-index: 1;
}

.cert-list-iso .cert-info h4 {
    font-size: 34px;
    line-height: 1.08;
    letter-spacing: 0.01em;
    margin-bottom: 12px;
    font-weight: 700;
}

.cert-list-iso .cert-info p {
    font-size: 15px;
    line-height: 1.7;
    max-width: 11em;
}

.cert-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.cert-item:hover {
    background: var(--bg-hover);
    transform: translateX(4px);
}

.cert-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
}

.cert-info h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    letter-spacing: 0.03em;
}

.cert-info p {
    font-size: 14px;
    color: var(--text-tertiary);
}

.award-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
}

.award-item {
    padding: 16px 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.award-item:hover {
    background: var(--accent-light);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.award-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.03em;
}

/* ---------- 工程业绩 ---------- */
.project-showcase {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 22px;
    margin-bottom: 32px;
}

.project-showcase-main,
.project-summary-grid {
    background: linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.96), rgba(var(--bg-primary-rgb), 0.84));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.12);
    box-shadow: var(--shadow-md);
}

.project-showcase-main {
    padding: 30px;
    border-radius: 28px;
}

.project-showcase-tag {
    display: inline-block;
    margin-bottom: 14px;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--accent-light);
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.project-showcase-main h3 {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.35;
    color: var(--text-primary);
    letter-spacing: 0.04em;
}

.project-showcase-main p {
    margin-top: 12px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.project-summary-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    border-radius: 28px;
    overflow: hidden;
}

.project-title-accent {
    color: var(--accent-primary);
}

.project-summary-card {
    min-height: 196px;
    padding: 28px 24px;
    background: rgba(var(--bg-primary-rgb), 0.88);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.project-summary-card strong {
    display: block;
    font-size: 28px;
    line-height: 1.18;
    color: var(--accent-primary);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.project-summary-card span {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 600;
    line-height: 1.6;
}

.project-filters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 14px;
    margin-bottom: 40px;
}

.project-filter {
    min-height: 84px;
    padding: 18px 16px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    background: linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.96), rgba(var(--bg-primary-rgb), 0.84));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    border-radius: 22px;
    letter-spacing: 0.03em;
    transition: all var(--transition-fast);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.project-filter:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

.project-filter.active {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 10px 24px rgba(var(--accent-primary-rgb), 0.24);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 24px;
}

.project-card {
    background: linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.98), rgba(var(--bg-primary-rgb), 0.88));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.project-card-featured {
    grid-column: span 2;
}

.project-image {
    height: 220px;
    background: linear-gradient(135deg, rgba(var(--accent-primary-rgb), 0.08), rgba(var(--accent-primary-rgb), 0.02));
    position: relative;
    overflow: hidden;
}

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

.project-image-overlay {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.08)),
        radial-gradient(circle at top right, rgba(var(--accent-primary-rgb), 0.16), transparent 40%);
}

.project-image-badge {
    position: absolute;
    top: 18px;
    left: 18px;
    z-index: 1;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(var(--bg-primary-rgb), 0.92);
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--text-muted);
    position: relative;
    z-index: 1;
}

.project-placeholder svg {
    width: 48px;
    height: 48px;
    opacity: 0.5;
}

.project-placeholder span {
    font-size: 14px;
}

.project-info {
    padding: 28px;
}

.project-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-light);
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
}

.project-info h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.4;
    letter-spacing: 0.03em;
}

.project-location {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--text-tertiary);
    margin-bottom: 10px;
}

.project-location svg {
    width: 16px;
    height: 16px;
}

.project-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.project-facts {
    display: grid;
    gap: 10px;
    margin-bottom: 18px;
}

.project-fact {
    display: grid;
    grid-template-columns: 78px 1fr;
    align-items: start;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 14px;
    background: rgba(var(--bg-primary-rgb), 0.72);
    border: 1px solid var(--border-light);
}

.project-fact span {
    color: var(--text-tertiary);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.03em;
}

.project-fact strong {
    color: var(--text-primary);
    font-size: 13px;
    line-height: 1.7;
    font-weight: 600;
}

.project-kpis {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 18px;
}

.project-kpis span {
    padding: 8px 12px;
    border-radius: 999px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
}

.project-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.project-amount {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-primary);
}

.project-year {
    font-size: 13px;
    color: var(--text-muted);
}

/* ---------- 新闻动态 ---------- */
.news-grid {
    display: grid;
    grid-template-columns: 1.85fr 1fr;
    grid-template-rows: repeat(3, 1fr);
    gap: 24px;
}

.news-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.news-card.featured {
    grid-row: span 3;
    display: flex;
    flex-direction: column;
}

.news-image {
    height: 320px;
    background: var(--bg-secondary);
}

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

.news-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.news-placeholder svg {
    width: 48px;
    height: 48px;
    opacity: 0.4;
}

.news-content {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news-card.featured .news-content {
    padding: 34px 34px 30px;
}

.news-date {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.news-content h4 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.4;
    letter-spacing: 0.03em;
}

.news-card.featured .news-content h4 {
    font-size: 26px;
    line-height: 1.35;
    letter-spacing: 0.04em;
    margin-bottom: 14px;
}

.news-card.featured .news-content p {
    font-size: 15px;
    line-height: 1.78;
}

.news-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    flex: 1;
}

.news-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-primary);
    transition: all var(--transition-fast);
}

.news-link:hover {
    color: var(--accent-secondary);
}

/* ---------- 联系我们 ---------- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: stretch;
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: repeat(3, 1fr);
    gap: 16px;
    min-height: 100%;
}

.contact-card {
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
    background:
        radial-gradient(circle at top right, rgba(var(--accent-primary-rgb), 0.10), transparent 34%),
        linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.97), rgba(var(--bg-primary-rgb), 0.90));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    min-height: 116px;
}

.contact-card::before {
    content: '';
    position: absolute;
    left: 20px;
    right: 20px;
    top: 0;
    height: 3px;
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(var(--accent-primary-rgb), 0.18), rgba(var(--accent-primary-rgb), 0.55), rgba(var(--accent-primary-rgb), 0.18));
}

.contact-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-3px);
    box-shadow: 0 18px 40px rgba(var(--accent-primary-rgb), 0.12);
}

.contact-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.contact-icon svg {
    width: 20px;
    height: 20px;
}

.contact-detail {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 72px;
    min-width: 0;
}

.contact-detail h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: 6px;
    letter-spacing: 0.03em;
}

.contact-detail p {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.45;
    overflow-wrap: anywhere;
    word-break: break-word;
}

.contact-link {
    color: inherit;
    transition: color var(--transition-fast);
    overflow-wrap: anywhere;
    word-break: break-word;
}

.contact-link:hover {
    color: var(--accent-primary);
}

.contact-handle {
    display: inline-block;
    padding: 2px 0;
    font-weight: 600;
    color: var(--accent-primary);
    letter-spacing: 0.03em;
}

.contact-form-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 40px;
    height: 100%;
    display: grid;
    align-content: start;
    gap: 24px;
    background:
        radial-gradient(circle at top right, rgba(var(--accent-primary-rgb), 0.08), transparent 28%),
        linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.98), rgba(var(--bg-primary-rgb), 0.92));
    box-shadow: var(--shadow-md);
}

.contact-form-wrapper h3 {
    font-size: 22px;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
    letter-spacing: 0.04em;
}

.contact-panel-intro {
    display: grid;
    gap: 14px;
}

.contact-panel-tag {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 0 14px;
    border-radius: 999px;
    background: rgba(var(--accent-primary-rgb), 0.10);
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    margin-bottom: 12px;
}

.contact-form-note {
    margin: 0;
    color: var(--text-tertiary);
    line-height: 1.7;
    font-size: 14px;
}

.contact-topic-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.contact-topic {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 14px;
    border-radius: 999px;
    background: rgba(var(--bg-primary-rgb), 0.78);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
}

.contact-action-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.95fr;
    gap: 16px;
}

.contact-action-card {
    display: grid;
    align-content: start;
    gap: 14px;
    padding: 22px;
    border-radius: 22px;
    background:
        radial-gradient(circle at top right, rgba(var(--accent-primary-rgb), 0.08), transparent 34%),
        linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.92), rgba(var(--bg-primary-rgb), 0.84));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.contact-action-tag {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    min-height: 30px;
    padding: 0 12px;
    border-radius: 999px;
    background: rgba(var(--accent-primary-rgb), 0.08);
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
}

.contact-action-card h4 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.03em;
}

.contact-action-card p {
    margin: 0;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.contact-action-list {
    display: grid;
    gap: 10px;
}

.contact-action-list li {
    position: relative;
    padding-left: 18px;
    font-size: 14px;
    color: var(--text-secondary);
}

.contact-action-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent-primary);
}

.contact-channel-list {
    display: grid;
    gap: 12px;
}

.contact-channel-item {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 16px;
    border-radius: 16px;
    background: linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.94), rgba(var(--bg-primary-rgb), 0.84));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
}

.contact-channel-item strong {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
}

.contact-channel-item span {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-primary);
    letter-spacing: 0.03em;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.site-modal {
    position: fixed;
    inset: 0;
    z-index: 1200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.site-modal.is-visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.site-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(5, 10, 24, 0.68);
    backdrop-filter: blur(10px);
}

.site-modal-dialog {
    position: relative;
    width: min(460px, 100%);
    border-radius: 28px;
    background:
        radial-gradient(circle at top right, rgba(var(--accent-primary-rgb), 0.16), transparent 34%),
        linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.98), rgba(var(--bg-primary-rgb), 0.92));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.16);
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.28);
    overflow: hidden;
}

.site-modal-content {
    display: grid;
    gap: 18px;
    padding: 34px 34px 30px;
}

.site-modal-close {
    position: absolute;
    top: 18px;
    right: 18px;
    width: 42px;
    height: 42px;
    border: none;
    border-radius: 50%;
    background: rgba(var(--accent-primary-rgb), 0.10);
    color: var(--accent-primary);
    cursor: pointer;
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.site-modal-close:hover {
    transform: rotate(90deg);
    background: rgba(var(--accent-primary-rgb), 0.16);
}

.site-modal-close span {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 2px;
    background: currentColor;
    border-radius: 999px;
}

.site-modal-close span:first-child {
    transform: translate(-50%, -50%) rotate(45deg);
}

.site-modal-close span:last-child {
    transform: translate(-50%, -50%) rotate(-45deg);
}

.site-modal-tag {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    min-height: 30px;
    padding: 0 12px;
    border-radius: 999px;
    background: rgba(var(--accent-primary-rgb), 0.10);
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.site-modal-content h3 {
    margin: 0;
    font-size: 28px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

.site-modal-desc {
    margin: 0;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.site-modal-qr {
    display: grid;
    place-items: center;
    min-height: 280px;
    padding: 24px;
    border-radius: 24px;
    background: linear-gradient(180deg, rgba(var(--bg-primary-rgb), 0.95), rgba(var(--bg-primary-rgb), 0.88));
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
}

.site-modal-qr-image {
    width: min(248px, 100%);
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 20px;
    display: block;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.16);
}

.site-modal-qr-image.is-hidden {
    display: none;
}

.site-modal-qr-placeholder {
    display: grid;
    gap: 10px;
    width: 100%;
    padding: 28px 22px;
    border-radius: 20px;
    border: 1px dashed rgba(var(--accent-primary-rgb), 0.28);
    background: rgba(var(--accent-primary-rgb), 0.04);
    text-align: center;
}

.site-modal-qr-placeholder strong {
    font-size: 16px;
    color: var(--text-primary);
}

.site-modal-qr-placeholder span {
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.site-modal-qr-placeholder code {
    padding: 2px 6px;
    border-radius: 8px;
    background: rgba(var(--accent-primary-rgb), 0.08);
    color: var(--accent-primary);
    font-family: 'Times New Roman', 'Source Han Serif SC', 'Noto Serif SC', 'Songti SC', serif;
}

.site-modal-meta {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.site-modal-meta div {
    display: grid;
    gap: 6px;
    padding: 16px 18px;
    border-radius: 18px;
    background: rgba(var(--bg-primary-rgb), 0.62);
    border: 1px solid rgba(var(--accent-primary-rgb), 0.10);
}

.site-modal-meta span {
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.site-modal-meta strong {
    font-size: 14px;
    color: var(--text-primary);
    line-height: 1.6;
}

.contact-honeypot {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--text-primary);
    font-family: inherit;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ---------- 页脚 ---------- */
.footer {
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo svg {
    width: 36px;
    height: 36px;
}

.footer-logo-img {
    width: 20px;
    height: 20px;
    object-fit: contain;
    border-radius: 4px;
}

.footer-logo span {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.04em;
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-tertiary);
    line-height: 1.8;
}

.footer-meta {
    color: var(--text-secondary);
    font-weight: 600;
}

.footer-links h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links li,
.footer-links a {
    font-size: 14px;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
}

.footer-inline-link {
    color: inherit;
}

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
}

/* ---------- 回到顶部 ---------- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--accent-primary);
    color: #fff;
    border-color: var(--accent-primary);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

/* ---------- 滚动动画 ---------- */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 响应式设计 ---------- */
@media (max-width: 1024px) {
    .qual-showcase {
        grid-template-columns: 1fr;
    }

    .project-showcase {
        grid-template-columns: 1fr;
    }

    .hero-orbit-one {
        width: 620px;
        height: 620px;
        left: 52%;
    }

    .hero-orbit-two {
        width: 320px;
        height: 320px;
        left: 64%;
    }

    .qual-summary-grid {
        grid-template-columns: 1fr 1fr 1fr;
    }

    .qual-panel-head {
        flex-direction: column;
        align-items: flex-start;
    }

    .qual-panel-meta {
        text-align: left;
    }

    .hero-shell {
        display: flex;
    }

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

    .project-card-featured {
        grid-column: span 1;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .about-info {
        grid-template-columns: repeat(4, 1fr);
    }

    .cert-list-iso {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }

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

    .credit-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .credit-card {
        grid-column: span 1;
        min-height: 300px;
    }

    .credit-card.featured {
        grid-column: span 2;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }
    
    .news-card.featured {
        grid-row: span 1;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
        --navbar-height: 64px;
    }

    .container,
    .nav-container {
        padding: 0 20px;
    }

    .logo-brand {
        font-size: 16px;
    }

    .lang-select {
        min-width: 112px;
        font-size: 12px;
        padding-left: 12px;
        padding-right: 30px;
    }

    .site-modal {
        padding: 18px;
    }

    .site-modal-content {
        padding: 28px 24px 24px;
    }

    .site-modal-content h3 {
        font-size: 24px;
    }

    .site-modal-qr {
        min-height: 240px;
        padding: 18px;
    }

    .site-modal-meta {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        width: 100%;
        padding: 12px 16px;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .qual-summary-grid {
        grid-template-columns: 1fr;
    }

    .qual-panel {
        padding: 24px;
    }

    .qual-capability-head h3,
    .qual-panel-head h3 {
        font-size: 22px;
    }

    .hero-stats {
        gap: 24px;
    }

    .hero-orbit-two {
        display: none;
    }

    .hero-highlights {
        gap: 10px;
    }
    
    .stat-num {
        font-size: 32px;
    }

    .about-info {
        grid-template-columns: 1fr 1fr;
    }

    .contact-info {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: none;
    }

    .contact-form-wrapper {
        padding: 28px 24px;
    }
    
    .timeline {
        flex-direction: column;
        gap: 18px;
        padding: 0;
    }
    
    .timeline::before {
        left: 8px;
        right: auto;
        top: 18px;
        bottom: 18px;
        width: 3px;
        height: auto;
    }
    
    .timeline-item {
        flex-direction: row;
        align-items: flex-start;
        text-align: left;
        gap: 16px;
        margin-top: 0;
    }
    
    .timeline-item:nth-child(even) {
        margin-top: 0;
    }

    .timeline-dot {
        margin-top: 18px;
    }

    .timeline-content {
        align-items: flex-start;
        text-align: left;
        min-height: auto;
    }
    
    .qual-track {
        --qual-columns: 2;
    }

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

    .project-summary-grid {
        grid-template-columns: 1fr;
    }

    .project-filters {
        grid-template-columns: 1fr 1fr;
    }

    .project-fact {
        grid-template-columns: 1fr;
        gap: 4px;
    }
    
    .credit-grid {
        grid-template-columns: 1fr;
    }

    .credit-card,
    .credit-card.featured {
        grid-column: span 1;
        min-height: auto;
        padding: 26px 22px;
    }

    .credit-card {
        gap: 18px;
    }

    .credit-card.featured .credit-points {
        grid-template-columns: 1fr;
    }
    
    .cert-category {
        padding: 24px;
    }

    .cert-list-iso {
        grid-template-columns: 1fr;
    }

    .cert-list-iso .cert-item {
        min-height: 0;
        padding: 24px;
        gap: 18px;
    }

    .cert-list-iso .cert-info h4 {
        font-size: 30px;
    }
    
    .award-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }

    .contact-action-grid {
        grid-template-columns: 1fr;
    }

    .contact-channel-item {
        align-items: flex-start;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-content {
        padding: 0 20px;
    }

    .hero-orbit-one {
        width: 420px;
        height: 420px;
        left: 50%;
    }

    .project-showcase-main {
        padding: 24px;
    }

    .project-showcase-main h3 {
        font-size: 24px;
    }

    .timeline-section {
        padding: 24px;
    }

    .timeline-title {
        font-size: 24px;
    }

    .project-filters {
        grid-template-columns: 1fr;
    }

    .contact-info {
        grid-template-columns: 1fr;
    }

    .about-info {
        grid-template-columns: 1fr;
    }
    
    .credit-grid {
        grid-template-columns: 1fr;
    }
    
    .qual-tabs {
        width: 100%;
        border-radius: 24px;
    }

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

    .hero-highlight {
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .project-grid {
        grid-template-columns: 1fr;
    }
    
    .qual-carousel {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .qual-track {
        --qual-columns: 1;
    }

    .qual-nav {
        display: none;
    }

    .qual-card {
        min-height: auto;
    }

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

    .qual-dots {
        margin-top: 18px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ---------- 打印样式 ---------- */
@media print {
    .navbar,
    .hero-scroll,
    .theme-toggle,
    .back-to-top,
    .mobile-toggle {
        display: none !important;
    }
    
    .hero {
        min-height: auto;
        padding: 40px 0;
    }
    
    .section {
        padding: 40px 0;
        page-break-inside: avoid;
    }
}