:root {
    --primary: #0D9488;
    --primary-dark: #0F766E;
    --primary-light: #14B8A6;
    --accent: #06B6D4;
    --accent-light: #22D3EE;
    --dark: #134E4A;
    --gray-900: #1E293B;
    --gray-700: #334155;
    --gray-500: #64748B;
    --gray-300: #CBD5E1;
    --gray-200: #E2E8F0;
    --gray-100: #F1F5F9;
    --gray-50: #F8FAFC;
    --white: #FFFFFF;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--gray-700);
    line-height: 1.7;
    background: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

ul {
    list-style: none;
}

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

.section {
    padding: 100px 0;
    position: relative;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(13, 148, 136, 0.35);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(13, 148, 136, 0.45);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255,255,255,0.5);
}

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

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

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

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--primary);
    background: rgba(13, 148, 136, 0.08);
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--gray-500);
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--primary);
}

.logo-img {
    height: 56px;
    width: auto;
    flex-shrink: 0;
}

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

.nav-link {
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-700);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(13, 148, 136, 0.06);
}

.nav-link.active {
    color: var(--primary);
    background: rgba(13, 148, 136, 0.08);
}

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

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

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--dark);
}

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

.hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #134E4A 0%, #0D9488 50%, #0891B2 100%);
}

.hero-gradient::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 30%, rgba(6, 182, 212, 0.15), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(20, 184, 166, 0.2), transparent 50%);
}

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

.particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    animation: float 20s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(0); }
    33% { transform: translateY(-30px) translateX(20px); }
    66% { transform: translateY(20px) translateX(-15px); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
    padding: 140px 24px 120px;
    max-width: 900px;
}

.hero-tag {
    display: inline-block;
    padding: 12px 32px;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 40px;
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.hero-title {
    font-size: 56px;
    font-weight: 900;
    line-height: 1.25;
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.title-line {
    display: block;
    background: linear-gradient(135deg, #ffffff 0%, #5EEAD4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.title-line:nth-child(2) {
    animation-delay: 0.2s;
}

.hero-desc {
    font-size: 18px;
    color: rgba(255,255,255,0.85);
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease 0.4s forwards;
    opacity: 0;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 80px;
    animation: fadeInUp 0.8s ease 0.6s forwards;
    opacity: 0;
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.6);
    font-size: 12px;
    letter-spacing: 2px;
    animation: fadeInUp 0.8s ease 0.8s forwards;
    opacity: 0;
    z-index: 2;
    pointer-events: none;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.3);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: var(--white);
    animation: scrollDown 2s infinite ease-in-out;
}

@keyframes scrollDown {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(200%); }
}

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

.stats-bar {
    background: var(--white);
    padding: 50px 0;
    border-bottom: 1px solid var(--gray-100);
}

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

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

.stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 50px;
    background: var(--gray-200);
}

.stat-number {
    font-size: 42px;
    font-weight: 900;
    color: var(--primary);
    display: inline;
}

.stat-suffix {
    font-size: 28px;
    font-weight: 700;
    color: var(--accent);
    display: inline;
}

.stat-label {
    font-size: 15px;
    color: var(--gray-500);
    margin-top: 8px;
}

.about {
    background: var(--gray-50);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text .about-lead {
    font-size: 18px;
    font-weight: 500;
    color: var(--gray-900);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-text p {
    margin-bottom: 16px;
    color: var(--gray-700);
    line-height: 1.9;
}

.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 36px;
}

.value-item {
    text-align: center;
    padding: 24px 16px;
    background: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}

.value-item:hover {
    border-color: var(--primary-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.value-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(13, 148, 136, 0.08);
    color: var(--primary);
    border-radius: 16px;
    transition: var(--transition);
}

.value-item:hover .value-icon {
    background: var(--primary);
    color: var(--white);
}

.value-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}

.value-item p {
    font-size: 13px;
    color: var(--gray-500);
    margin: 0;
    line-height: 1.6;
}

.about-visual {
    position: sticky;
    top: 100px;
}

.about-card {
    position: relative;
    background: linear-gradient(135deg, var(--primary) 0%, #0891B2 100%);
    border-radius: var(--radius-lg);
    padding: 40px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(13, 148, 136, 0.25);
}

.card-glow {
    position: absolute;
    top: -50%;
    right: -30%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(255,255,255,0.15), transparent 70%);
    border-radius: 50%;
}

.card-content {
    position: relative;
    z-index: 2;
}

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

.card-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 20px;
    font-size: 13px;
    color: var(--white);
    font-weight: 500;
}

.card-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feature-row {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--white);
    font-size: 15px;
}

.business {
    background: var(--white);
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.business-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.business-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

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

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

.card-icon-wrap {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.1), rgba(6, 182, 212, 0.1));
    color: var(--primary);
    border-radius: 18px;
    margin-bottom: 24px;
    transition: var(--transition);
}

.business-card:hover .card-icon-wrap {
    background: var(--primary);
    color: var(--white);
    transform: scale(1.05);
}

.business-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
}

.business-card p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.8;
    margin-bottom: 20px;
}

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

.card-list li {
    font-size: 14px;
    color: var(--gray-700);
    padding-left: 20px;
    position: relative;
}

.card-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
}

/* ===== 运营模式 ===== */
.operation {
    background: var(--gray-50);
}

.operation-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.operation-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--gray-200);
}

.operation-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.op-number {
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 48px;
    font-weight: 900;
    color: rgba(13, 148, 136, 0.08);
    line-height: 1;
}

.op-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.1), rgba(6, 182, 212, 0.1));
    color: var(--primary);
    border-radius: 18px;
    margin-bottom: 24px;
}

.operation-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
}

.operation-card p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.8;
    margin-bottom: 20px;
}

.op-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

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

.op-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

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

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.advantage-card {
    display: flex;
    gap: 24px;
    padding: 32px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

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

.adv-icon {
    width: 64px;
    height: 64px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.1), rgba(6, 182, 212, 0.1));
    color: var(--primary);
    border-radius: 18px;
    transition: var(--transition);
}

.advantage-card:hover .adv-icon {
    background: var(--primary);
    color: var(--white);
}

.advantage-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 10px;
}

.advantage-card p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.8;
}

/* ===== 业务覆盖 ===== */
.coverage {
    background: var(--gray-50);
}

.coverage-content {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 60px;
    align-items: center;
}

.map-card {
    background: linear-gradient(135deg, var(--primary) 0%, #0891B2 100%);
    border-radius: var(--radius-lg);
    padding: 36px;
    color: var(--white);
    box-shadow: 0 20px 60px rgba(13, 148, 136, 0.25);
    position: relative;
    overflow: hidden;
}

.map-card::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -20%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(255,255,255,0.12), transparent 70%);
    border-radius: 50%;
}

.map-header {
    position: relative;
    z-index: 2;
    margin-bottom: 24px;
}

.map-header h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
}

.map-header p {
    opacity: 0.85;
    line-height: 1.6;
    font-size: 14px;
}

.map-cities {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.city-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.city-item:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.city-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.7);
    position: relative;
    flex-shrink: 0;
}

.city-item.core .city-dot {
    background: #FCD34D;
    box-shadow: 0 0 0 4px rgba(252, 211, 77, 0.3);
}

.city-info {
    display: flex;
    flex-direction: column;
}

.city-name {
    font-size: 16px;
    font-weight: 600;
}

.city-role {
    font-size: 11px;
    opacity: 0.75;
}

.coverage-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.coverage-text h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
}

.coverage-text p {
    font-size: 15px;
    color: var(--gray-700);
    line-height: 1.9;
    margin-bottom: 12px;
}

.coverage-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.cov-stat {
    text-align: center;
    padding: 24px 12px;
    background: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.cov-stat:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.cov-number {
    display: block;
    font-size: 32px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 6px;
}

.cov-label {
    font-size: 13px;
    color: var(--gray-500);
}

/* ===== 新闻动态 ===== */
.news {
    background: var(--white);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.news-item {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    gap: 20px;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

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

.news-date {
    flex-shrink: 0;
    text-align: center;
    min-width: 60px;
}

.news-day {
    display: block;
    font-size: 32px;
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
}

.news-month {
    display: block;
    font-size: 12px;
    color: var(--gray-500);
    margin-top: 4px;
}

.news-content {
    flex: 1;
}

.news-category {
    display: inline-block;
    font-size: 12px;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 8px;
}

.news-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-content p {
    font-size: 13px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-link {
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
    transition: var(--transition);
}

.news-link:hover {
    color: var(--primary-dark);
}

/* ===== 联系我们 ===== */
.contact {
    background: var(--gray-50);
}

.contact-content {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 40px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

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

.contact-item:hover .contact-icon {
    background: var(--primary);
    color: var(--white);
}

.contact-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(13, 148, 136, 0.08);
    color: var(--primary);
    border-radius: 12px;
    flex-shrink: 0;
    transition: var(--transition);
}

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

.contact-detail h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 6px;
}

.contact-detail p {
    font-size: 13px;
    color: var(--gray-500);
    line-height: 1.6;
}

.contact-form-wrap {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 16px;
    border: 1px solid var(--gray-200);
}

.contact-form h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 2px;
}

.form-desc {
    font-size: 11px;
    color: var(--gray-500);
    margin-bottom: 10px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.form-group {
    margin-bottom: 8px;
}

.form-group label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 4px;
}

.form-group label span {
    color: #EF4444;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 6px 10px;
    border: 1.5px solid var(--gray-200);
    border-radius: 8px;
    font-size: 12px;
    font-family: inherit;
    color: var(--gray-900);
    background: var(--gray-50);
    transition: var(--transition);
    resize: vertical;
}

.form-group textarea {
    min-height: 48px;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
    background: var(--white);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-300);
}

.form-success {
    display: none;
    text-align: center;
    padding: 20px 12px;
}

.form-success.show {
    display: block;
    animation: fadeInUp 0.5s ease;
}

.form-success svg {
    width: 40px;
    height: 40px;
}

.form-success p {
    font-size: 14px;
    color: var(--dark);
    margin-top: 10px;
    line-height: 1.6;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
    margin-bottom: 16px;
}

.footer-logo-img {
    height: 50px;
    width: auto;
    filter: brightness(0) invert(1);
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255,255,255,0.5);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
}

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

.footer-col li {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
}

.footer-col a {
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
}

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

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

.footer-bottom p {
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

.footer-tech {
    margin-top: 8px;
    font-size: 12px !important;
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    box-shadow: 0 4px 14px rgba(13, 148, 136, 0.35);
    z-index: 999;
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ===== 滚动动画 ===== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .business-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .operation-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-visual {
        position: static;
    }
    
    .coverage-content {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-info {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .hero-title {
        font-size: 44px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        box-shadow: var(--shadow-md);
        transform: translateY(-150%);
        transition: transform 0.4s ease;
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .hero-content {
        padding: 120px 20px 100px;
    }

    .hero-tag {
        font-size: 16px;
        padding: 10px 24px;
        letter-spacing: 1px;
    }

    .hero-title {
        font-size: 32px;
        letter-spacing: 1px;
    }
    
    .hero-desc {
        font-size: 15px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
        margin-bottom: 60px;
        gap: 12px;
    }

    .hero-scroll {
        bottom: 20px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px 20px;
    }
    
    .stat-item:nth-child(2)::after {
        display: none;
    }
    
    .stat-number {
        font-size: 34px;
    }
    
    .about-values {
        grid-template-columns: 1fr;
    }
    
    .business-grid {
        grid-template-columns: 1fr;
    }
    
    .operation-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .china-map-wrap {
        max-width: 420px;
    }
    
    .city-marker-text {
        font-size: 12px;
    }
    
    .city-marker-text.core {
        font-size: 14px;
    }
    
    .coverage-stats {
        grid-template-columns: 1fr 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links {
        grid-template-columns: 1fr 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .contact-form-wrap {
        padding: 28px 20px;
    }
    
    .advantage-card {
        flex-direction: column;
        gap: 20px;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .coverage-stats {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .logo-img {
        height: 44px;
    }
    
    .hero-title {
        font-size: 26px;
    }
}