/* ===== 基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a73e8;
    --primary-dark: #1557b0;
    --secondary-color: #00d4ff;
    --accent-color: #ff6b35;
    --success-color: #00c853;
    --text-color: #1f1f1f;
    --text-light: #666;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --bg-dark: #1a1a1a;
    --gradient-primary: linear-gradient(135deg, #1a73e8 0%, #00d4ff 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
    --radius: 16px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow-x: hidden;
}

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

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    z-index: 1000;
    padding: 16px 0;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.12);
}

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

.nav-brand a {
    text-decoration: none;
}

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

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    font-weight: 700;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.brand-name {
    font-size: 24px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-en {
    font-size: 12px;
    color: var(--text-light);
    letter-spacing: 2px;
    font-weight: 600;
}

.nav-menu {
    display: flex;
    gap: 40px;
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 15px;
    transition: all 0.3s ease;
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.active {
    color: var(--primary-color);
}

.nav-cta {
    display: block;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(26, 115, 232, 0.3);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(26, 115, 232, 0.4);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    width: 30px;
}

.nav-toggle span {
    width: 100%;
    height: 3px;
    background: var(--text-color);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.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;
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f0f4ff 0%, #fff 50%, #fff0eb 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(26, 115, 232, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(0, 212, 255, 0.05) 0%, transparent 50%);
    z-index: 0;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(26, 115, 232, 0.1);
    border-radius: 50px;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-badge i {
    font-size: 12px;
}

.hero-title {
    font-size: 56px;
    font-weight: 900;
    margin-bottom: 24px;
    line-height: 1.1;
}

.title-main {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.title-sub {
    display: block;
    font-size: 20px;
    color: var(--text-light);
    font-weight: 600;
    letter-spacing: 4px;
}

.hero-description {
    font-size: 18px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
    margin-bottom: 40px;
    padding: 24px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

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

.stat-number {
    font-size: 28px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.stat-divider {
    width: 1px;
    height: 40px;
    background: #e0e0e0;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(26, 115, 232, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(26, 115, 232, 0.4);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* Hero 视觉部分 */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.floating-card {
    position: absolute;
    padding: 16px 24px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    animation: float 3s ease-in-out infinite;
}

.floating-card i {
    font-size: 24px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card-1 {
    top: -20px;
    left: 0;
    animation-delay: 0s;
}

.card-2 {
    top: 50%;
    right: -20px;
    animation-delay: 0.5s;
}

.card-3 {
    bottom: -20px;
    left: 50px;
    animation-delay: 1s;
}

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

.main-phone {
    width: 320px;
    height: 640px;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
}

.phone-screen {
    background: white;
    height: 100%;
    border-radius: 32px;
    overflow: hidden;
}

.app-header {
    background: var(--gradient-primary);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: white;
}

.app-logo {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-name {
    font-weight: 600;
}

.app-body {
    padding: 20px;
}

.match-card {
    padding: 16px;
    background: var(--bg-light);
    border-radius: 12px;
    margin-bottom: 12px;
}

.match-live {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 8px;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.match-live span:last-child {
    color: var(--accent-color);
    font-size: 12px;
    font-weight: 700;
}

.match-teams {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.vs {
    color: var(--text-light);
    font-size: 14px;
}

.match-score {
    display: flex;
    justify-content: center;
    gap: 20px;
    font-size: 28px;
    font-weight: 800;
}

.match-score span:first-child {
    color: var(--primary-color);
}

.match-score span:last-child {
    color: var(--text-color);
}

.match-time {
    text-align: center;
    color: var(--text-light);
    font-weight: 600;
}

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

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

.section-tag {
    display: inline-block;
    padding: 8px 24px;
    background: rgba(26, 115, 232, 0.1);
    border-radius: 50px;
    color: var(--primary-color);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-color);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-light);
}

/* ===== 特性板块 ===== */
.features {
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.feature-card {
    padding: 40px;
    background: white;
    border-radius: var(--radius);
    border: 2px solid #f0f0f0;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.feature-icon-wrapper {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 28px;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-color);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 20px;
}

.feature-meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.feature-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--primary-color);
    font-weight: 500;
}

.feature-meta i {
    font-size: 12px;
}

/* ===== 使命愿景 ===== */
.mission {
    background: var(--bg-light);
}

.mission-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.mission-description {
    font-size: 18px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 40px;
}

.mission-features {
    display: grid;
    gap: 24px;
}

.mission-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: white;
    border-radius: var(--radius);
    transition: all 0.3s ease;
}

.mission-item:hover {
    box-shadow: var(--shadow);
}

.mission-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    flex-shrink: 0;
}

.mission-info h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.mission-info p {
    color: var(--text-light);
    line-height: 1.6;
}

.radar-system {
    background: white;
    padding: 40px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
}

.radar-circle {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: var(--bg-light);
    margin: 0 auto 24px;
    position: relative;
    border: 3px solid var(--primary-color);
}

.radar-scanner {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.3) 0%, transparent 50%);
    transform-origin: top left;
    animation: scan 3s linear infinite;
}

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

.radar-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
}

.radar-desc {
    color: var(--text-light);
    margin-bottom: 32px;
}

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

.radar-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    background: var(--bg-light);
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
}

.radar-item i {
    color: var(--primary-color);
}

/* ===== 数据概览 ===== */
.stats-overview {
    background: var(--gradient-primary);
    color: white;
}

.stats-overview .section-tag {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.stats-overview .section-title {
    color: white;
}

.stats-overview .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

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

.stat-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 40px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 24px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-icon {
    width: 72px;
    height: 72px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.stat-info {
    flex: 1;
}

.stat-value {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 16px;
    opacity: 0.9;
}

/* ===== 用户评价 ===== */
.testimonials {
    background: white;
}

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

.testimonial-card {
    padding: 32px;
    background: var(--bg-light);
    border-radius: var(--radius);
    transition: all 0.3s ease;
}

.testimonial-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.testimonial-avatar {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    margin-bottom: 20px;
}

.testimonial-rating {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    color: #ffc107;
}

.testimonial-text {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 20px;
    font-style: italic;
}

.testimonial-author {
    font-weight: 600;
    color: var(--text-color);
}

/* ===== 下载区域 ===== */
.download-section {
    position: relative;
    padding: 120px 0;
    background: var(--bg-light);
    overflow: hidden;
}

.download-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 30% 50%, rgba(26, 115, 232, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 50%);
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.download-description {
    font-size: 18px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 40px;
}

.download-features {
    display: grid;
    gap: 24px;
    margin-bottom: 40px;
}

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

.download-feature i {
    font-size: 24px;
    color: var(--success-color);
    flex-shrink: 0;
}

.download-feature strong {
    display: block;
    font-size: 16px;
    margin-bottom: 4px;
}

.download-feature p {
    color: var(--text-light);
    font-size: 14px;
}

.download-buttons {
    display: flex;
    gap: 16px;
}

.btn-download-store {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 28px;
    background: white;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    min-width: 180px;
}

.btn-download-store:hover {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
    transform: translateY(-3px);
}

.btn-download-store i {
    font-size: 36px;
}

.btn-download-store.ios i {
    color: #000;
}

.btn-download-store.android i {
    color: var(--primary-color);
}

.btn-download-store div {
    display: flex;
    flex-direction: column;
}

.btn-download-store span {
    font-size: 11px;
    opacity: 0.7;
}

.btn-download-store strong {
    font-size: 16px;
}

.phone-showcase {
    display: flex;
    justify-content: center;
}

.phone-frame {
    width: 320px;
    height: 640px;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
}

.phone-notch {
    width: 120px;
    height: 28px;
    background: #1a1a1a;
    border-radius: 0 0 16px 16px;
    margin: 0 auto;
}

.phone-screen-content {
    background: white;
    height: calc(100% - 28px);
    border-radius: 28px 28px 32px 32px;
    overflow: hidden;
}

.screen-header {
    background: var(--gradient-primary);
    color: white;
    padding: 16px;
    text-align: center;
    font-weight: 600;
}

.screen-body {
    padding: 20px;
}

.live-match {
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);
    padding: 20px;
    border-radius: 16px;
    margin-bottom: 16px;
}

.live-badge {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-color);
    color: white;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 16px;
}

.match-info {
    text-align: center;
    margin-bottom: 12px;
}

.match-info .team {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 16px;
}

.match-info .score {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary-color);
    margin: 12px 0;
}

.match-status {
    text-align: center;
    color: var(--text-light);
    font-size: 14px;
}

.coming-match {
    background: var(--bg-light);
    padding: 16px;
    border-radius: 12px;
}

.coming-match .match-time {
    text-align: center;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 24px;
    margin-bottom: 12px;
}

.coming-match .match-teams {
    display: flex;
    justify-content: center;
    gap: 16px;
    font-weight: 600;
    color: var(--text-light);
}

/* ===== 荣誉奖项 ===== */
.awards {
    background: white;
}

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

.award-card {
    padding: 32px;
    background: var(--bg-light);
    border-radius: var(--radius);
    text-align: center;
    transition: all 0.3s ease;
}

.award-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.award-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    margin: 0 auto 20px;
}

.award-info h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
}

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

/* ===== 新闻资讯 ===== */
.news {
    background: var(--bg-light);
}

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

.news-card {
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.news-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.news-image {
    height: 200px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    color: rgba(255, 255, 255, 0.3);
}

.news-content {
    padding: 24px;
}

.news-date {
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
}

.news-content h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.5;
    color: var(--text-color);
}

.news-content > p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.news-link:hover {
    gap: 12px;
}

/* ===== 安全防护 ===== */
.security {
    background: white;
}

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

.security-item {
    text-align: center;
    padding: 40px 24px;
}

.security-icon-wrapper {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 36px;
    color: var(--primary-color);
}

.security-item h4 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.security-item p {
    color: var(--text-light);
    line-height: 1.6;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 80px 0 32px;
}

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

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

.footer-logo i {
    font-size: 32px;
    color: var(--primary-color);
}

.footer-logo span {
    font-size: 24px;
    font-weight: 800;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
    margin-bottom: 24px;
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
}

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

.footer-links h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 24px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: white;
    padding-left: 8px;
}

.footer-contact ul {
    list-style: none;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-contact i {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero .container,
    .mission-content,
    .download-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .hero-visual,
    .mission-visual,
    .download-visual {
        order: -1;
    }

    .testimonials-grid,
    .awards-grid,
    .security-features,
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        flex-direction: column;
        background: white;
        width: 100%;
        padding: 24px;
        box-shadow: var(--shadow);
        transition: left 0.3s ease;
        gap: 16px;
    }

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

    .nav-cta {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 40px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .stat-divider {
        width: 100%;
        height: 1px;
    }

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

    .hero-buttons,
    .download-buttons {
        flex-direction: column;
    }

    .testimonials-grid,
    .awards-grid,
    .security-features,
    .news-grid,
    .footer-content {
        grid-template-columns: 1fr;
    }

    .main-phone,
    .phone-frame {
        width: 280px;
        height: 560px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 32px;
    }

    .section-title {
        font-size: 32px;
    }

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