/* ========================================
   智仪全球 - 主样式文件
   ======================================== */

:root {
    --primary: #e2001a;
    --primary-dark: #b00015;
    --primary-light: #fef2f3;
    --secondary: #285ae6;
    --accent: #ff6600;
    --warning: #f59e0b;
    --danger: #dc2626;
    --purple: #7c3aed;
    --dark: #1a1a2e;
    --dark-2: #16213e;
    --gray-900: #1a1a1a;
    --gray-700: #404040;
    --gray-500: #666666;
    --gray-300: #cccccc;
    --gray-100: #eeeeee;
    --gray-50: #f5f5f5;
    --white: #ffffff;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.16);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --gradient-primary: linear-gradient(135deg, #e2001a 0%, #285ae6 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --gradient-accent: linear-gradient(135deg, #16a34a 0%, #285ae6 100%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--gray-900);
    background: #f5f5f5;
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 16px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 16px rgba(29, 78, 216, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(29, 78, 216, 0.5);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

/* ========== 顶部通告栏 ========== */
.top-bar {
    background: var(--dark);
    color: rgba(255,255,255,0.8);
    font-size: 13px;
    padding: 8px 0;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-bar-right {
    display: flex;
    gap: 20px;
}

.top-bar-right a {
    color: rgba(255,255,255,0.8);
    transition: var(--transition);
}

.top-bar-right a:hover {
    color: var(--white);
}

/* ========== 主导航 ========== */
.main-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    transition: var(--transition);
}

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

.main-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

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

.logo-text h1 {
    font-size: 22px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.logo-text small {
    font-size: 11px;
    color: var(--gray-500);
    letter-spacing: 1px;
}

.main-nav {
    display: flex;
    gap: 8px;
}

.main-nav a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-700);
    transition: var(--transition);
}

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

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

.search-btn,
.cart-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    color: var(--gray-700);
    transition: var(--transition);
    position: relative;
}

.search-btn:hover,
.cart-btn:hover {
    background: var(--primary);
    color: var(--white);
}

.cart-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    background: var(--danger);
    color: var(--white);
    font-size: 10px;
    font-weight: 700;
    min-width: 18px;
    height: 18px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
}

/* ========== 搜索面板 ========== */
.search-panel {
    display: none;
    background: #f5f5f5;
    border-bottom: 1px solid var(--gray-300);
    padding: 20px 0;
    box-shadow: var(--shadow-md);
}

.search-panel.active {
    display: block;
}

.search-panel input {
    width: 100%;
    padding: 14px 20px;
    font-size: 16px;
    border: 2px solid var(--primary);
    border-radius: var(--radius-md);
    outline: none;
}

.search-suggestions {
    margin-top: 12px;
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--gray-500);
}

.search-suggestions a {
    padding: 4px 12px;
    background: var(--gray-100);
    border-radius: 20px;
    transition: var(--transition);
}

.search-suggestions a:hover {
    background: var(--primary);
    color: var(--white);
}

/* ========== Hero ========== */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    background: linear-gradient(180deg, #eef2ff 0%, #f5f5f5 100%);
    overflow: hidden;
    padding: 60px 0 100px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 30%, rgba(29,78,216,0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 60%, rgba(14,116,144,0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(21,128,61,0.06) 0%, transparent 40%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 24px;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: 56px;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 24px;
}

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

.hero-desc {
    font-size: 18px;
    color: var(--gray-700);
    margin-bottom: 36px;
    max-width: 520px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 56px;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

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

.stat-num {
    font-size: 36px;
    font-weight: 900;
    color: var(--primary);
    line-height: 1.1;
}

.stat-plus {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 13px;
    color: var(--gray-500);
    margin-top: 4px;
}

/* Hero 3D地球仪 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.globe-container {
    position: relative;
    width: 320px;
    height: 320px;
}

.globe-svg {
    width: 100%;
    height: 100%;
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.globe-label {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    color: var(--primary);
    font-weight: 600;
    letter-spacing: 2px;
    white-space: nowrap;
}

/* 滚动提示 */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--gray-500);
}

.scroll-line {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, var(--primary), transparent);
    animation: scrollHint 2s infinite;
}

@keyframes scrollHint {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform: scaleY(1); transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ========== Section通用 ========== */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header.light h2,
.section-header.light p {
    color: var(--white);
}

.section-tag {
    display: inline-block;
    padding: 4px 14px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.5px;
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: 38px;
    font-weight: 800;
    margin-bottom: 12px;
}

.section-header p {
    font-size: 16px;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

.section-footer {
    text-align: center;
    margin-top: 48px;
}

/* ========== 业务模式 ========== */
.business-models {
    background: #f5f5f5;
}

.model-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.model-card {
    position: relative;
    padding: 36px 28px;
    background: #f5f5f5;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.model-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.model-card.highlight {
    background: linear-gradient(135deg, #fef2f3 0%, #fef2f3 100%);
    border-color: var(--primary);
}

.model-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 10px;
    background: var(--primary);
    color: var(--white);
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
}

.model-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.model-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
}

.model-card ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.model-card ul li {
    font-size: 14px;
    color: var(--gray-700);
    padding-left: 18px;
    position: relative;
}

.model-card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

/* ========== 产品分类 ========== */
.product-categories {
    background: #f5f5f5;
}

.category-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.cat-tab {
    padding: 10px 24px;
    border: 1px solid var(--gray-300);
    background: #f5f5f5;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.cat-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.cat-tab.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.product-card {
    background: #f5f5f5;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    cursor: pointer;
}

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

.product-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #fef2f3, #fef2f3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    position: relative;
}

.product-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    background: var(--danger);
    color: var(--white);
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}

.product-badge.cert {
    background: var(--accent);
}

.product-info {
    padding: 16px 20px;
}

.product-category {
    font-size: 11px;
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.product-name {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.3;
}

.product-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.spec-tag {
    padding: 2px 8px;
    background: var(--gray-100);
    border-radius: 4px;
    font-size: 11px;
    color: var(--gray-700);
}

.product-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.product-price {
    font-size: 18px;
    font-weight: 800;
    color: var(--danger);
}

.product-price small {
    font-size: 12px;
    color: var(--gray-500);
    font-weight: 400;
}

.product-actions {
    display: flex;
    gap: 8px;
}

.btn-inquire {
    padding: 6px 14px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-inquire:hover {
    background: var(--primary-dark);
}

/* ========== 网上展馆 ========== */
.showroom-preview {
    background: linear-gradient(135deg, #0a0a1a 0%, #1a1a3e 50%, #14143e 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.showroom-preview::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 30% 40%, rgba(29,78,216,0.2) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(14,116,144,0.15) 0%, transparent 50%);
    pointer-events: none;
}

.showroom-preview .container {
    position: relative;
    z-index: 1;
}

.showroom-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

/* 3D展厅CSS预览 */
.showroom-3d-preview {
    perspective: 1000px;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.showroom-scene {
    position: relative;
    width: 360px;
    height: 280px;
    transform-style: preserve-3d;
    transform: rotateX(-15deg) rotateY(-20deg);
    animation: sceneRotate 20s ease-in-out infinite alternate;
}

@keyframes sceneRotate {
    0% { transform: rotateX(-15deg) rotateY(-20deg); }
    100% { transform: rotateX(-5deg) rotateY(10deg); }
}

.showroom-floor {
    position: absolute;
    width: 360px;
    height: 280px;
    background: linear-gradient(135deg, rgba(29,78,216,0.15), rgba(0,188,212,0.05));
    border: 1px solid rgba(26,115,232,0.3);
    transform: rotateX(90deg) translateZ(-140px);
    box-shadow: 0 0 40px rgba(26,115,232,0.2);
}

.showroom-walls {
    position: absolute;
    width: 100%;
    height: 100%;
}

.wall {
    position: absolute;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.1);
}

.wall-back {
    width: 360px;
    height: 200px;
    transform: translateZ(-140px);
    background: linear-gradient(180deg, rgba(26,115,232,0.08), rgba(0,188,212,0.03));
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 20px;
}

.wall-left {
    width: 280px;
    height: 200px;
    transform: rotateY(90deg) translateZ(-180px);
}

.wall-right {
    width: 280px;
    height: 200px;
    transform: rotateY(-90deg) translateZ(-180px);
}

.booth {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.1);
    backdrop-filter: blur(4px);
}

.booth-product {
    font-size: 36px;
}

.booth-label {
    font-size: 12px;
    color: rgba(255,255,255,0.9);
    font-weight: 600;
}

.showroom-info h3 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 28px;
}

.showroom-features {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}

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

.feature-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: rgba(26,115,232,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.feature-item h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 4px;
}

.feature-item p {
    font-size: 13px;
    color: rgba(255,255,255,0.75);
}

/* ========== 交易流程 ========== */
.trade-flow {
    background: #f5f5f5;
}

.flow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
}

.flow-step {
    text-align: center;
    padding: 28px 20px;
    background: #f5f5f5;
    border-radius: var(--radius-lg);
    min-width: 160px;
    transition: var(--transition);
}

.flow-step:hover {
    background: var(--primary-light);
    transform: translateY(-4px);
}

.step-num {
    font-size: 32px;
    font-weight: 900;
    color: var(--primary);
    opacity: 0.3;
    line-height: 1;
    margin-bottom: 8px;
}

.step-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.flow-step h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 6px;
}

.flow-step p {
    font-size: 12px;
    color: var(--gray-500);
}

.flow-arrow {
    font-size: 24px;
    color: var(--primary);
    font-weight: 700;
}

/* ========== 解决方案 ========== */
.solutions-preview {
    background: #f5f5f5;
}

.solution-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.sol-card {
    padding: 32px 28px;
    background: #f5f5f5;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-top: 4px solid var(--sol-color, var(--primary));
}

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

.sol-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.sol-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}

.sol-card p {
    font-size: 14px;
    color: var(--gray-700);
    margin-bottom: 16px;
    line-height: 1.6;
}

.sol-card a {
    font-size: 14px;
    font-weight: 600;
    color: var(--sol-color, var(--primary));
}

/* ========== 数据看板 ========== */
.data-dashboard {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    color: var(--white);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.dash-card {
    padding: 28px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(8px);
}

.dash-value {
    font-size: 36px;
    font-weight: 900;
    margin-bottom: 4px;
}

.dash-label {
    font-size: 14px;
    color: rgba(255,255,255,0.75);
    margin-bottom: 8px;
}

.dash-trend {
    font-size: 13px;
    font-weight: 600;
}

.dash-trend.up {
    color: var(--accent);
}

.chart-area {
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid rgba(255,255,255,0.1);
}

/* ========== 信任背书 ========== */
.trust-section {
    background: #f5f5f5;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 12px;
    margin-bottom: 48px;
}

.cert-item {
    padding: 16px 8px;
    text-align: center;
    background: #f5f5f5;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    transition: var(--transition);
}

.cert-item:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

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

.partner-logos span {
    font-size: 14px;
    color: var(--gray-500);
    display: block;
    margin-bottom: 16px;
}

.partner-names {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.partner-names em {
    font-size: 20px;
    font-weight: 800;
    font-style: normal;
    color: var(--gray-500);
    transition: var(--transition);
    cursor: default;
}

.partner-names em:hover {
    color: var(--primary);
}

/* ========== CTA ========== */
.cta-section {
    background: linear-gradient(135deg, #fef2f3 0%, #fef2f3 100%);
    padding: 80px 0;
    text-align: center;
}

.cta-content h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 16px;
    color: var(--gray-700);
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== 页脚 ========== */
.main-footer {
    background: var(--dark);
    color: rgba(255,255,255,0.8);
    padding: 60px 0 24px;
}

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

.footer-logo h3 {
    font-size: 24px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 4px;
}

.footer-logo small {
    font-size: 12px;
    color: var(--gray-500);
}

.footer-col p {
    font-size: 14px;
    margin-top: 16px;
    line-height: 1.7;
}

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.social-links a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
}

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

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

.footer-col ul a {
    font-size: 14px;
    color: rgba(255,255,255,0.75);
    transition: var(--transition);
}

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

.contact-info li {
    font-size: 14px !important;
    color: rgba(255,255,255,0.6) !important;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.6);
}

.footer-bottom a {
    color: rgba(255,255,255,0.6);
}

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

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    border: none;
    font-size: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}