/* ================================
   Viet-Top 企业官网样式表
   ================================ */

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

:root {
    /* 色彩系统 */
    --color-primary: #E63946;
    --color-primary-dark: #C1121F;
    --color-primary-light: #FF6B75;
    --color-secondary: #06A77D;
    --color-secondary-dark: #048A65;
    --color-accent: #F4A261;
    --color-accent-dark: #E07A1F;
    --color-yellow: #FFD93D;
    --color-dark: #1D3557;
    --color-dark-2: #2A3A5C;
    --color-text: #2C3E50;
    --color-text-light: #6C757D;
    --color-text-lighter: #95A5A6;
    --color-bg: #F8F9FA;
    --color-bg-alt: #F0F2F5;
    --color-white: #FFFFFF;
    --color-border: #E8EAED;
    --color-shadow: rgba(29, 53, 87, 0.08);
    --color-shadow-hover: rgba(29, 53, 87, 0.15);

    /* 间距 */
    --section-padding: 100px 0;
    --container-max: 1200px;
    --container-padding: 24px;

    /* 过渡 */
    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease;
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px var(--color-shadow);
    --shadow-lg: 0 16px 48px var(--color-shadow);
    --shadow-xl: 0 24px 64px var(--color-shadow-hover);
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--color-text);
    background: var(--color-white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul {
    list-style: none;
}

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

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

input,
textarea {
    font-family: inherit;
    font-size: inherit;
}

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

.section {
    padding: var(--section-padding);
    position: relative;
}

.section-alt {
    background: var(--color-bg);
}

.section-dark {
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
    color: var(--color-white);
}

/* ===== 通用标题 ===== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header-light .section-title,
.section-header-light .section-desc {
    color: var(--color-white);
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-primary);
    padding: 6px 18px;
    border: 1.5px solid var(--color-primary);
    border-radius: 30px;
    margin-bottom: 18px;
    text-transform: uppercase;
}

.section-dark .section-tag {
    color: var(--color-yellow);
    border-color: var(--color-yellow);
}

.section-title {
    font-size: 2.4rem;
    font-weight: 900;
    color: var(--color-dark);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

.section-dark .section-desc {
    color: rgba(255, 255, 255, 0.7);
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 4px 16px rgba(230, 57, 70, 0.3);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(230, 57, 70, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.6);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--color-white);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 18px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: 12px 0;
}

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

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

.nav-logo:hover {
    opacity: 0.85;
}

.logo-icon {
    display: flex;
    filter: drop-shadow(0 2px 8px rgba(230, 57, 70, 0.3));
}

.logo-text {
    font-size: 1.35rem;
    font-weight: 900;
    color: var(--color-white);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

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

.logo-sub {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 1px;
}

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

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

.nav-link {
    display: block;
    padding: 8px 16px;
    font-size: 0.95rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    border-radius: 30px;
    transition: var(--transition-fast);
    position: relative;
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--color-white);
    background: rgba(230, 57, 70, 0.85);
}

.navbar.scrolled .nav-link:hover,
.navbar.scrolled .nav-link.active {
    color: var(--color-white);
    background: var(--color-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 6px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2.5px;
    background: var(--color-white);
    border-radius: 4px;
    transition: var(--transition);
}

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

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #1D3557 0%, #2A3A5C 40%, #E63946 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero-bg-pattern {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(255, 217, 61, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 80% 20%, rgba(6, 167, 125, 0.15) 0%, transparent 35%),
        radial-gradient(circle at 60% 80%, rgba(244, 162, 97, 0.1) 0%, transparent 35%);
    pointer-events: none;
}

.hero-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-content {
    color: var(--color-white);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
    color: rgba(255, 255, 255, 0.95);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-yellow);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
    font-size: 3.8rem;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-yellow) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-tags {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.hero-tag {
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.9);
    transition: var(--transition-fast);
}

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

/* Hero 视觉区域 */
.hero-visual {
    position: relative;
    height: 420px;
}

.hero-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.hero-card-main {
    width: 320px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: floatMain 6s ease-in-out infinite;
}

@keyframes floatMain {
    0%, 100% { transform: translate(-50%, -50%); }
    50% { transform: translate(-50%, calc(-50% - 12px)); }
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 20px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
}

.card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
}

.card-label {
    font-size: 0.95rem;
    font-weight: 600;
}

.card-body {
    padding: 8px 0;
}

.card-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-fast);
}

.card-row:last-child {
    border-bottom: none;
}

.card-row:hover {
    background: var(--color-bg);
}

.card-name {
    font-size: 0.9rem;
    color: var(--color-text);
    font-weight: 500;
}

.card-rating {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-accent-dark);
}

.card-rating::before {
    content: '★ ';
}

.hero-card-float {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 22px;
    border-radius: var(--radius-md);
}

.hero-card-1 {
    top: 30px;
    right: 20px;
    animation: float1 5s ease-in-out infinite;
}

.hero-card-2 {
    bottom: 30px;
    left: 0;
    animation: float2 5s ease-in-out infinite 0.5s;
}

@keyframes float1 {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

@keyframes float2 {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(15px); }
}

.float-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-dark) 100%);
    color: var(--color-white);
    border-radius: var(--radius-sm);
}

.float-title {
    font-size: 0.78rem;
    color: var(--color-text-light);
}

.float-value {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--color-dark);
}

/* Hero 波浪 */
.hero-wave {
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    line-height: 0;
}

.hero-wave svg {
    width: 100%;
    height: 80px;
}

/* ===== 关于我们 ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-heading {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 20px;
}

.about-text p {
    font-size: 1rem;
    color: var(--color-text-light);
    line-height: 1.9;
    margin-bottom: 16px;
}

.about-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 28px;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-dark);
}

.highlight-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(6, 167, 125, 0.1);
    color: var(--color-secondary);
    border-radius: var(--radius-sm);
}

.about-cards {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mission-card {
    padding: 28px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--color-primary);
    transition: var(--transition);
}

.mission-card:nth-child(2) {
    border-left-color: var(--color-secondary);
}

.mission-card:nth-child(3) {
    border-left-color: var(--color-accent);
}

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

.mission-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    background: rgba(230, 57, 70, 0.08);
    color: var(--color-primary);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
}

.mission-card:nth-child(2) .mission-icon {
    background: rgba(6, 167, 125, 0.08);
    color: var(--color-secondary);
}

.mission-card:nth-child(3) .mission-icon {
    background: rgba(244, 162, 97, 0.1);
    color: var(--color-accent-dark);
}

.mission-card h4 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.mission-card p {
    font-size: 0.92rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ===== 业务介绍 ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.service-card {
    padding: 36px 28px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--color-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

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

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

.service-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    color: var(--color-white);
}

.service-icon-1 {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
}

.service-icon-2 {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-dark) 100%);
}

.service-icon-3 {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
}

.service-icon-4 {
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
}

.service-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 12px;
}

.service-desc {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 18px;
}

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

.service-list li {
    font-size: 0.85rem;
    color: var(--color-text);
    padding-left: 22px;
    position: relative;
    line-height: 1.6;
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 14px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

.service-card:nth-child(2) .service-list li::before { background: var(--color-secondary); }
.service-card:nth-child(3) .service-list li::before { background: var(--color-accent); }
.service-card:nth-child(4) .service-list li::before { background: var(--color-dark); }

/* ===== 平台特色 ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.feature-item {
    display: flex;
    gap: 24px;
    padding: 32px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

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

.feature-number {
    font-size: 2.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    flex-shrink: 0;
}

.feature-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.feature-desc {
    font-size: 0.92rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ===== 数据统计 ===== */
.stats {
    position: relative;
    overflow: hidden;
}

.stats::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 15% 50%, rgba(255, 217, 61, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 30%, rgba(230, 57, 70, 0.1) 0%, transparent 35%);
    pointer-events: none;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    position: relative;
    z-index: 2;
}

.stat-card {
    text-align: center;
    padding: 32px 20px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-6px);
}

.stat-number {
    font-size: 2.8rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--color-yellow) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    line-height: 1.1;
}

.stat-label {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 6px;
}

.stat-desc {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.5;
}

.stats-wave-top,
.stats-wave-bottom {
    position: absolute;
    left: 0;
    width: 100%;
    line-height: 0;
    pointer-events: none;
}

.stats-wave-top {
    top: -1px;
}

.stats-wave-bottom {
    bottom: -1px;
}

.stats-wave-top svg,
.stats-wave-bottom svg {
    width: 100%;
    height: 60px;
}

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

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

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

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.contact-detail h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 4px;
}

.contact-detail p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* 联系表单 */
.contact-form-wrap {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 40px;
    border: 1px solid var(--color-border);
}

.form-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 6px;
}

.form-subtitle {
    font-size: 0.88rem;
    color: var(--color-text-light);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-dark);
    margin-bottom: 6px;
}

.required {
    color: var(--color-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    color: var(--color-text);
    background: var(--color-bg);
    transition: var(--transition-fast);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.1);
}

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

.form-note {
    margin-top: 16px;
    padding: 12px 16px;
    background: rgba(6, 167, 125, 0.08);
    color: var(--color-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 500;
    text-align: center;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 30px;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo span {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--color-white);
}

.footer-desc {
    font-size: 0.88rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.6);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-col h5 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 16px;
}

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

.footer-col a {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition-fast);
}

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

.footer-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin-bottom: 24px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-legal p {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.5);
    line-height: 1.6;
}

.footer-icp {
    margin-top: 8px;
    padding-top: 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.4);
    line-height: 2;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.7);
    border-radius: 50%;
    transition: var(--transition-fast);
}

.social-link:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-3px);
}

/* ===== 弹窗 ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    padding: 20px;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    max-width: 640px;
    width: 100%;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 28px;
    border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-dark);
}

.modal-close {
    font-size: 1.6rem;
    color: var(--color-text-light);
    line-height: 1;
    transition: var(--transition-fast);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.modal-close:hover {
    color: var(--color-primary);
    background: rgba(230, 57, 70, 0.08);
}

.modal-body {
    padding: 28px;
    overflow-y: auto;
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--color-text-light);
}

.modal-body h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin: 16px 0 8px;
}

.modal-body h4:first-child {
    margin-top: 0;
}

.modal-body p {
    margin-bottom: 12px;
}

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(230, 57, 70, 0.3);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
}

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

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-4px);
}

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

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }
.fade-up-delay-4 { transition-delay: 0.4s; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }

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

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

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

@media (max-width: 768px) {
    :root {
        --section-padding: 70px 0;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-white);
        flex-direction: column;
        padding: 80px 20px 20px;
        gap: 4px;
        box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
        transition: right 0.35s ease;
        z-index: 999;
    }

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

    .nav-menu .nav-link {
        color: var(--color-text);
        width: 100%;
        text-align: center;
        padding: 12px 16px;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

    .hero {
        min-height: auto;
        padding-top: 100px;
        padding-bottom: 60px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-title {
        font-size: 2.4rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-visual {
        height: 320px;
    }

    .hero-card-main {
        width: 260px;
    }

    .hero-card-1 {
        right: 0;
    }

    .section-title {
        font-size: 1.8rem;
    }

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

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

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

    .contact-form-wrap {
        padding: 28px;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-links {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

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

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

    .feature-item {
        flex-direction: column;
        gap: 12px;
    }

    .section-title {
        font-size: 1.5rem;
    }
}