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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Roboto', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 辅助类 ===== */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 2.5rem; }

/* ===== 按钮样式 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    font-size: 16px;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, #0088cc, #006699);
    color: white;
    border-color: #0088cc;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #006699, #004466);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 136, 204, 0.2);
}

.btn-outline {
    background: transparent;
    color: #0088cc;
    border-color: #0088cc;
}

.btn-outline:hover {
    background: rgba(0, 136, 204, 0.1);
    transform: translateY(-2px);
}

.btn-login {
    background: transparent;
    color: #333;
    border: 2px solid #e0e0e0;
}

.btn-login:hover {
    background: #f8f9fa;
    border-color: #ccc;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 18px;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-download {
    background: linear-gradient(135deg, #34b7f1, #0088cc);
    color: white;
}

.btn-download:hover {
    background: linear-gradient(135deg, #0088cc, #006699);
}

.btn-link {
    color: #0088cc;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-link:hover {
    text-decoration: underline;
}

/* ===== 顶部通知栏 ===== */
.top-notice {
    background: linear-gradient(90deg, #0088cc, #34b7f1);
    color: white;
    padding: 12px 0;
    position: relative;
}

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

.top-notice p {
    font-weight: 500;
    font-size: 14px;
}

.notice-close {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 5px;
    border-radius: 4px;
}

.notice-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ===== 导航栏 ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
}

.logo-area {
    flex: 0 0 auto;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
    gap: 12px;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

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

.logo-name {
    font-size: 24px;
    font-weight: 800;
    color: #0088cc;
    line-height: 1;
}

.logo-tagline {
    font-size: 12px;
    color: #666;
    margin-top: 2px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 10px;
    margin: 0 30px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    text-decoration: none;
    color: #555;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: #0088cc;
    background: rgba(0, 136, 204, 0.1);
}

.dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: none;
    border: none;
    color: #555;
    font-weight: 500;
    font-size: 16px;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.dropdown-toggle:hover {
    color: #0088cc;
    background: rgba(0, 136, 204, 0.1);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 100;
    list-style: none;
    padding: 10px 0;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    text-decoration: none;
    color: #555;
    transition: all 0.3s ease;
}

.dropdown-menu a:hover {
    color: #0088cc;
    background: rgba(0, 136, 204, 0.1);
}

.user-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.language-selector {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: rgba(0, 0, 0, 0.05);
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background: rgba(0, 0, 0, 0.1);
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 120px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 100;
}

.language-selector:hover .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-dropdown a {
    display: block;
    padding: 10px 16px;
    text-decoration: none;
    color: #555;
    transition: all 0.3s ease;
}

.lang-dropdown a:hover {
    color: #0088cc;
    background: rgba(0, 136, 204, 0.1);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    width: 30px;
    height: 30px;
    cursor: pointer;
    position: relative;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
    content: '';
    position: absolute;
    width: 30px;
    height: 3px;
    background: #333;
    border-radius: 3px;
    transition: all 0.3s ease;
}

.menu-icon {
    top: 50%;
    transform: translateY(-50%);
}

.menu-icon::before {
    top: -8px;
}

.menu-icon::after {
    top: 8px;
}

.mobile-menu-btn.active .menu-icon {
    background: transparent;
}

.mobile-menu-btn.active .menu-icon::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .menu-icon::after {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ===== 英雄区域 ===== */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e6f4ff 100%);
    position: relative;
    overflow: hidden;
}

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

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-block;
    background: rgba(0, 136, 204, 0.1);
    color: #0088cc;
    padding: 8px 16px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 20px;
}

.hero-title {
    font-size: 48px;
    line-height: 1.2;
    margin-bottom: 20px;
    color: #1a1a1a;
    font-weight: 800;
}

.hero-subtitle {
    font-size: 18px;
    color: #666;
    margin-bottom: 30px;
    line-height: 1.6;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 40px 0;
}

.stat {
    text-align: center;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.stat-number {
    font-size: 32px;
    font-weight: 800;
    color: #0088cc;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: #666;
    font-weight: 500;
}

.hero-actions {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.hero-note {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #666;
    font-size: 14px;
}

.hero-visual {
    flex: 1;
    position: relative;
}

.app-preview {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.app-preview img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.1));
    border-radius: 12px;
}

.message-preview {
    position: absolute;
    top: 20%;
    right: 10%;
    width: 70%;
    background: white;
    border-radius: 12px;
    padding: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.message-item {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.message-item.my-message {
    justify-content: flex-end;
}

.message-avatar {
    width: 36px;
    height: 36px;
    background: #0088cc;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.message-content {
    max-width: 80%;
}

.message-sender {
    font-weight: 600;
    font-size: 12px;
    color: #666;
    margin-bottom: 4px;
}

.message-text {
    background: #f0f9ff;
    padding: 10px 15px;
    border-radius: 18px;
    font-size: 14px;
}

.my-message .message-text {
    background: #0088cc;
    color: white;
}

/* ===== 下载区域 ===== */
.download-section {
    padding: 100px 0;
    background: white;
}

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

.section-title {
    font-size: 36px;
    font-weight: 800;
    color: #1a1a1a;
    margin-bottom: 15px;
}

.section-subtitle {
    font-size: 18px;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

.download-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.download-card {
    background: #f8f9fa;
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.download-card:hover {
    transform: translateY(-10px);
    border-color: #0088cc;
    box-shadow: 0 20px 40px rgba(0, 136, 204, 0.1);
}

.platform-icon {
    font-size: 48px;
    color: #0088cc;
    margin-bottom: 20px;
}

.download-card h3 {
    font-size: 22px;
    margin-bottom: 10px;
    color: #1a1a1a;
}

.download-card p {
    color: #666;
    margin-bottom: 20px;
    font-size: 14px;
}

.file-info {
    color: #999;
    font-size: 12px;
    margin-bottom: 25px;
}

.store-badge {
    margin-top: 15px;
}

.store-badge img {
    height: 40px;
    border-radius: 8px;
}

.direct-download {
    margin-top: 10px;
}

.download-extras {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.extra-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: #f8f9fa;
    border-radius: 30px;
    color: #666;
    font-weight: 500;
    transition: all 0.3s ease;
}

.extra-item:hover {
    background: #e9ecef;
    color: #0088cc;
}

.web-telegram {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, #f0f9ff, #e6f4ff);
    border-radius: 16px;
    padding: 40px;
    margin-top: 60px;
}

.web-info {
    flex: 1;
}

.web-info h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #1a1a1a;
    display: flex;
    align-items: center;
    gap: 10px;
}

.web-info p {
    color: #666;
    margin-bottom: 25px;
}

.qr-code {
    text-align: center;
}

.qr-code img {
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.qr-text {
    color: #666;
    font-size: 14px;
    margin-top: 15px;
}

/* ===== 功能特色 ===== */
.features-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8fbff 0%, #f0f7ff 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.feature-card {
    background: white;
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 136, 204, 0.1);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #0088cc, #006699);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    color: white;
    font-size: 32px;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

.feature-showcase {
    margin-top: 80px;
}

.showcase-item {
    display: flex;
    align-items: center;
    gap: 60px;
    margin-bottom: 80px;
}

.showcase-item.reverse {
    flex-direction: row-reverse;
}

.showcase-image {
    flex: 1;
}

.showcase-image img {
    width: 100%;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.showcase-content {
    flex: 1;
}

.showcase-content h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: #1a1a1a;
}

.showcase-content p {
    color: #666;
    margin-bottom: 25px;
    line-height: 1.6;
}

.showcase-content ul {
    list-style: none;
}

.showcase-content li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #555;
}

.showcase-content i {
    color: #0088cc;
}

/* ===== 安全特性 ===== */
.security-section {
    padding: 100px 0;
    background: white;
}

.security-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.security-card {
    text-align: center;
    padding: 30px;
    background: #f8f9fa;
    border-radius: 16px;
    transition: all 0.3s ease;
}

.security-card:hover {
    transform: translateY(-10px);
    background: white;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.security-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #0088cc, #006699);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 28px;
}

.security-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.security-card p {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
}

.security-details {
    display: flex;
    align-items: center;
    gap: 60px;
    background: linear-gradient(135deg, #f0f9ff, #e6f4ff);
    border-radius: 16px;
    padding: 40px;
}

.details-content {
    flex: 1;
}

.details-content h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: #1a1a1a;
    display: flex;
    align-items: center;
    gap: 10px;
}

.details-content p {
    color: #666;
    margin-bottom: 30px;
    line-height: 1.6;
}

.security-points {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.point {
    background: white;
    padding: 20px;
    border-radius: 12px;
}

.point h4 {
    font-size: 16px;
    margin-bottom: 10px;
    color: #1a1a1a;
    display: flex;
    align-items: center;
    gap: 8px;
}

.point p {
    color: #666;
    font-size: 14px;
    line-height: 1.5;
    margin: 0;
}

.details-image {
    flex: 1;
}

.details-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* ===== 平台支持 ===== */
.platforms-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8fbff 0%, #f0f7ff 100%);
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
    margin-bottom: 60px;
}

.platform-card {
    text-align: center;
    padding: 30px 20px;
    background: white;
    border-radius: 16px;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.platform-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 136, 204, 0.1);
}

.platform-icon {
    font-size: 40px;
    color: #0088cc;
    margin-bottom: 15px;
}

.platform-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #1a1a1a;
}

.platform-card p {
    color: #666;
    font-size: 14px;
    line-height: 1.5;
}

.sync-feature {
    display: flex;
    align-items: center;
    gap: 60px;
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.sync-content {
    flex: 1;
}

.sync-content h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: #1a1a1a;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sync-content p {
    color: #666;
    margin-bottom: 25px;
    line-height: 1.6;
}

.sync-content ul {
    list-style: none;
}

.sync-content li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #555;
}

.sync-content i {
    color: #0088cc;
}

.sync-visual {
    flex: 1;
    position: relative;
}

.device-group {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    height: 200px;
}

.device {
    width: 60px;
    height: 60px;
    background: #0088cc;
    color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    z-index: 2;
}

.device.phone {
    transform: translateY(-20px);
}

.device.tablet {
    transform: translateY(0);
}

.device.laptop {
    transform: translateY(20px);
}

.sync-lines {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.line {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: #0088cc;
    opacity: 0.3;
    transform: translateY(-50%);
}

.line:nth-child(2) {
    top: calc(50% - 20px);
}

.line:nth-child(3) {
    top: calc(50% + 20px);
}

/* ===== 常见问题 ===== */
.faq-section {
    padding: 100px 0;
    background: white;
}

.faq-grid {
    max-width: 800px;
    margin: 0 auto 40px;
}

.faq-item {
    background: #f8f9fa;
    border-radius: 12px;
    margin-bottom: 15px;
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: #e9ecef;
}

.faq-question h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
}

.faq-question i {
    color: #0088cc;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 30px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 30px 30px;
    max-height: 500px;
}

.faq-answer p {
    color: #666;
    line-height: 1.6;
}

.faq-cta {
    text-align: center;
    padding: 30px;
    background: #f8f9fa;
    border-radius: 16px;
}

.faq-cta a {
    color: #0088cc;
    font-weight: 600;
    text-decoration: none;
}

.faq-cta a:hover {
    text-decoration: underline;
}

/* ===== SEO内容区域 ===== */
.seo-content-section {
    padding: 60px 0;
    background: #f8f9fa;
}

.seo-content {
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.seo-content h2 {
    font-size: 28px;
    margin-bottom: 25px;
    color: #1a1a1a;
}

.seo-content h3 {
    font-size: 22px;
    margin: 30px 0 15px;
    color: #1a1a1a;
}

.seo-content p {
    margin-bottom: 20px;
    line-height: 1.8;
    color: #555;
}

.seo-content strong {
    color: #0088cc;
}

/* ===== 页脚 ===== */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 40px;
    margin-bottom: 60px;
}

.footer-section h4 {
    font-size: 18px;
    margin-bottom: 25px;
    color: white;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.footer-logo img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.footer-logo h3 {
    font-size: 24px;
    color: white;
}

.footer-logo p {
    font-size: 12px;
    color: #999;
    margin-top: 2px;
}

.footer-desc {
    color: #999;
    line-height: 1.6;
    margin-bottom: 25px;
}

.footer-social {
    display: flex;
    gap: 15px;
}

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

.footer-social a:hover {
    background: #0088cc;
    transform: translateY(-3px);
}

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

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

.footer-section ul a {
    color: #999;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 14px;
}

.footer-section ul a:hover {
    color: white;
    padding-left: 5px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
    color: #999;
    font-size: 14px;
}

.footer-copyright p:first-child {
    margin-bottom: 5px;
}

.footer-languages {
    display: flex;
    align-items: center;
    gap: 15px;
    color: #999;
}

.footer-languages a {
    color: #999;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-languages a:hover {
    color: white;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .security-features {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .platforms-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
    }
    
    .hero-content {
        text-align: center;
        margin-bottom: 60px;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .user-actions {
        display: none;
    }
    
    .download-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .showcase-item,
    .showcase-item.reverse {
        flex-direction: column;
    }
    
    .security-details {
        flex-direction: column;
    }
    
    .security-points {
        grid-template-columns: 1fr;
    }
    
    .sync-feature {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }
    
    .section-title {
        font-size: 30px;
    }
    
    .download-cards {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .security-features {
        grid-template-columns: 1fr;
    }
    
    .platforms-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 28px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .download-extras {
        flex-direction: column;
        align-items: center;
    }
    
    .web-telegram {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }
    
    .platforms-grid {
        grid-template-columns: 1fr;
    }
}