/* =========================================
   楚戎智联教育咨询 - 企业官网样式
   ========================================= */

/* CSS 变量 */
:root {
    --primary: #1a3a5c;
    --primary-dark: #0f2842;
    --primary-light: #2a5a8a;
    --accent: #c9a227;
    --accent-light: #e0bc3b;
    --accent-dark: #a8861a;
    --text: #1a1a2e;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg: #ffffff;
    --bg-secondary: #f7f9fc;
    --bg-dark: #0f172a;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* 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);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* =========================================
   导航栏
   ========================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 24px;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow);
    padding-top: 0;
    padding-bottom: 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--accent);
    transition: var(--transition);
}

.navbar.scrolled .logo-icon {
    color: var(--primary);
}

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

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

.logo-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
    transition: var(--transition);
}

.navbar.scrolled .logo-name {
    color: var(--primary);
}

.logo-sub {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 2px;
    transition: var(--transition);
}

.navbar.scrolled .logo-sub {
    color: var(--text-light);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 18px;
    font-size: 0.95rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
    border-radius: 100px;
    transition: var(--transition);
    position: relative;
}

.navbar.scrolled .nav-link {
    color: var(--text-secondary);
}

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

.navbar.scrolled .nav-link:hover,
.navbar.scrolled .nav-link.active {
    color: var(--primary);
    background: rgba(26, 58, 92, 0.08);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    transition: var(--transition);
    border-radius: 2px;
}

.navbar.scrolled .nav-toggle span {
    background: var(--primary);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* =========================================
   Hero 区域
   ========================================= */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 120px 24px 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(26, 58, 92, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(201, 162, 39, 0.1) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 80%, rgba(26, 58, 92, 0.2) 0%, transparent 50%);
    background-color: var(--primary-dark);
}

.hero-pattern::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(15, 40, 66, 0.92) 0%, rgba(26, 58, 92, 0.85) 50%, rgba(15, 23, 42, 0.9) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    text-align: center;
    color: #fff;
    animation: fadeInUp 1s ease-out;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(201, 162, 39, 0.15);
    border: 1px solid rgba(201, 162, 39, 0.3);
    border-radius: 100px;
    font-size: 0.9rem;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.badge-star {
    color: var(--accent);
    font-size: 1rem;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 16px;
    line-height: 1.8;
}

.hero-desc strong {
    color: var(--accent-light);
    font-weight: 600;
}

.hero-subdesc {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font);
    border-radius: 100px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: #fff;
    box-shadow: 0 8px 20px rgba(201, 162, 39, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(201, 162, 39, 0.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

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

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

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

.stat-num {
    display: block;
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.15);
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.75rem;
    animation: bounce 2s infinite;
}

.scroll-mouse {
    width: 22px;
    height: 34px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    position: relative;
}

.scroll-wheel {
    width: 4px;
    height: 6px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollWheel 2s infinite;
}

/* =========================================
   通用区块样式
   ========================================= */
section {
    padding: 100px 0;
}

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

.section-header.light .section-tag,
.section-header.light .section-title,
.section-header.light .section-subtitle {
    color: #fff;
}

.section-header.light .section-subtitle {
    color: rgba(255, 255, 255, 0.7);
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 4px;
    color: var(--accent);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 900;
    color: var(--text);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
}

/* =========================================
   关于我们
   ========================================= */
.about {
    background: var(--bg-secondary);
}

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

.about-text h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 24px;
    line-height: 1.4;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 1rem;
    line-height: 1.8;
}

.about-text strong {
    color: var(--primary);
    font-weight: 600;
}

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

.feature-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.feature-icon svg {
    width: 22px;
    height: 22px;
}

.feature-info h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 2px;
}

.feature-info p {
    font-size: 0.85rem;
    color: var(--text-light);
}

.about-visual {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    padding: 20px;
}

.about-card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.12);
}

.about-card.main-card {
    grid-column: 1 / -1;
    padding: 40px;
    position: relative;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
}

.card-accent {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(201, 162, 39, 0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.main-card .card-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.card-number {
    font-size: 4rem;
    font-weight: 900;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 8px;
}

.card-label {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.card-desc {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.sub-card .card-content {
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px;
}

.card-icon {
    font-size: 2rem;
}

.sub-card .card-label {
    font-size: 1rem;
    color: var(--text);
    font-weight: 600;
}

/* =========================================
   产品服务
   ========================================= */
.services {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    position: relative;
    overflow: hidden;
}

.services::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(201, 162, 39, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(255, 255, 255, 0.03) 0%, transparent 50%);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    position: relative;
    z-index: 1;
}

.service-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 40px 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.3);
}

.service-card.featured {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(201, 162, 39, 0.3);
    transform: scale(1.02);
}

.service-card.featured:hover {
    transform: scale(1.02) translateY(-8px);
}

.service-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 100px;
}

.service-number {
    font-size: 3rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.08);
    line-height: 1;
    margin-bottom: 16px;
}

.service-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border-radius: var(--radius-sm);
    margin-bottom: 24px;
    color: #fff;
}

.service-icon svg {
    width: 28px;
    height: 28px;
}

.service-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}

.service-desc {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 24px;
    line-height: 1.7;
}

.service-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.service-list li {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    padding-left: 20px;
    position: relative;
}

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

/* =========================================
   核心优势
   ========================================= */
.advantages {
    background: var(--bg);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.advantage-card {
    text-align: center;
    padding: 40px 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    transition: var(--transition);
    border: 1px solid transparent;
}

.advantage-card:hover {
    transform: translateY(-8px);
    background: #fff;
    border-color: var(--border);
    box-shadow: var(--shadow-lg);
}

.advantage-icon-wrap {
    display: inline-flex;
    margin-bottom: 24px;
}

.advantage-icon {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border-radius: 50%;
    box-shadow: 0 10px 30px rgba(26, 58, 92, 0.25);
    transition: var(--transition);
}

.advantage-card:hover .advantage-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 15px 40px rgba(26, 58, 92, 0.35);
}

.advantage-icon svg {
    width: 32px;
    height: 32px;
}

.advantage-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
}

.advantage-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* =========================================
   CTA 区域
   ========================================= */
.cta-section {
    position: relative;
    padding: 100px 0;
    overflow: hidden;
}

.cta-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-dark), var(--accent));
}

.cta-pattern {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 20%);
    opacity: 0.5;
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: #fff;
    max-width: 700px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: clamp(1.5rem, 3.5vw, 2.25rem);
    font-weight: 900;
    margin-bottom: 16px;
    line-height: 1.3;
}

.cta-content p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 32px;
}

.cta-content .btn-primary {
    background: #fff;
    color: var(--accent-dark);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.cta-content .btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

/* =========================================
   联系我们
   ========================================= */
.contact {
    background: var(--bg-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-company {
    margin-bottom: 40px;
}

.contact-company h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.company-tagline {
    color: var(--text-light);
    font-size: 0.95rem;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

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

.contact-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

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

.contact-detail {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-top: 4px;
}

.contact-label {
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 500;
}

.contact-value {
    font-size: 1.1rem;
    color: var(--text);
    font-weight: 600;
}

.contact-form-wrap {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.contact-form {
    padding: 40px;
}

.form-header {
    margin-bottom: 28px;
}

.form-header h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.form-header p {
    font-size: 0.9rem;
    color: var(--text-light);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    font-size: 1rem;
    font-family: var(--font);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(26, 58, 92, 0.08);
}

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

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23718096' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 18px;
    padding-right: 44px;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* =========================================
   页脚
   ========================================= */
.footer {
    background: var(--bg-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 80px 0 0;
}

.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand {
    max-width: 320px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo .logo-icon {
    width: 36px;
    height: 36px;
    color: var(--accent);
}

.footer-logo-text {
    display: flex;
    flex-direction: column;
}

.footer-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
}

.footer-sub {
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 2px;
}

.footer-desc {
    font-size: 0.9rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.5);
}

.footer-column h4 {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-column a {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--accent);
    padding-left: 4px;
}

.footer-column li {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.35);
}

/* =========================================
   回到顶部
   ========================================= */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    box-shadow: 0 8px 20px rgba(26, 58, 92, 0.3);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(26, 58, 92, 0.4);
}

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

/* =========================================
   动画
   ========================================= */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes scrollWheel {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(12px);
    }
}

/* 滚动入场动画 */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   响应式设计
   ========================================= */
@media (max-width: 1024px) {
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .about-visual {
        order: -1;
        max-width: 500px;
        margin: 0 auto;
    }

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

    .services-grid {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin: 0 auto;
    }

    .service-card.featured {
        transform: none;
    }

    .service-card.featured:hover {
        transform: translateY(-8px);
    }

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

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--primary-dark);
        flex-direction: column;
        justify-content: center;
        gap: 16px;
        padding: 80px 40px;
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: -10px 0 40px rgba(0, 0, 0, 0.3);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-link {
        font-size: 1.1rem;
        padding: 12px 0;
        width: 100%;
        border-radius: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-link:hover,
    .nav-link.active {
        background: none;
        padding-left: 8px;
    }

    .navbar.scrolled .nav-menu {
        background: #fff;
    }

    .navbar.scrolled .nav-link {
        color: var(--text);
        border-bottom-color: var(--border);
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-divider {
        display: none;
    }

    .stat-item {
        flex: 1;
        min-width: 120px;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .footer-main {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand {
        max-width: 100%;
    }

    .footer-logo {
        justify-content: center;
    }

    section {
        padding: 60px 0;
    }

    .contact-form {
        padding: 30px 24px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

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

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

    .about-card.main-card {
        grid-column: 1;
    }

    .stat-num {
        font-size: 2rem;
    }
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}