/* ===== CSS变量定义 - 商务简洁风格 ===== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary: #0f172a;
    --accent: #64748b;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-section: #f1f5f9;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.08), 0 1px 2px -1px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    --gradient-light: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

/* ===== 通用工具类 ===== */
.hidden {
    display: none !important;
}

[hidden] {
    display: none !important;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-white);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul {
    list-style: none;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    padding: 0.75rem 2rem;
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background-image: url('../images/app_icon.png');
    background-size: contain;
    background-repeat: no-repeat;
}

.logo-text .highlight {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

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

/* ===== 导航操作按钮区域 ===== */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.nav-actions .nav-auth {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 导航按钮通用样式 - 三个按钮大小完全一致 */
.nav-actions .btn-nav {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    height: 38px;
    min-width: 88px;
    padding: 0 1.1rem;
    box-sizing: border-box;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.9rem;
    line-height: 1;
    transition: all 0.25s ease;
    cursor: pointer;
    white-space: nowrap;
}

/* 登录按钮 - 幽灵按钮样式 (边框预留位置) */
.nav-actions .btn-nav-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.nav-actions .btn-nav-ghost:hover {
    background: var(--bg-light);
    color: var(--primary);
    border-color: var(--primary);
}

/* 注册按钮 - 主按钮样式 */
.nav-actions #btnNavRegister {
    background: var(--primary);
    color: #fff;
    border: 1px solid transparent;
}

.nav-actions #btnNavRegister:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* 下载按钮 - 主按钮样式，带图标 */
.nav-actions .btn-nav-primary {
    background: var(--primary);
    color: #fff;
    border: 1px solid transparent;
}

.nav-actions .btn-nav-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    transform: translateY(-1px);
}

.nav-actions .btn-nav-primary i {
    font-size: 0.85rem;
}

/* ===== 已登录用户菜单 ===== */
.nav-actions .nav-user {
    position: relative;
}

.nav-actions .btn-nav-user {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.8rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.25s ease;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.nav-actions .btn-nav-user:hover {
    background: var(--bg-card);
    border-color: var(--primary);
}

.nav-actions .user-avatar {
    width: 28px;
    height: 28px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.8rem;
}

.nav-actions .user-name {
    font-weight: 500;
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.nav-actions .user-caret {
    font-size: 0.7rem;
    color: var(--text-muted);
    transition: transform 0.25s ease;
}

.nav-actions .btn-nav-user.active .user-caret {
    transform: rotate(180deg);
}

/* 用户下拉菜单 */
.nav-actions .user-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 180px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    padding: 0.5rem 0;
    z-index: 100;
}

/* 用户下拉菜单默认隐藏 (HTML 已带 hidden class, 这里强制生效) */
.nav-actions .user-menu.hidden {
    display: none !important;
}

.nav-actions .user-menu-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    width: 100%;
    padding: 0.65rem 1rem;
    background: none;
    border: none;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.nav-actions .user-menu-item:hover {
    background: var(--bg-light);
    color: var(--primary);
}

.nav-actions .user-menu-item i {
    width: 16px;
    text-align: center;
    color: var(--text-muted);
}

.nav-actions .user-menu-item:hover i {
    color: var(--primary);
}

.nav-actions .user-menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.5rem 0;
}

.nav-actions .user-menu-logout {
    color: #ef4444;
}

.nav-actions .user-menu-logout i {
    color: #ef4444;
}

.nav-actions .user-menu-logout:hover {
    background: #fef2f2;
    color: #dc2626;
}

.nav-actions .menu-badge {
    background: #ef4444;
    color: #fff;
    font-size: 0.7rem;
    padding: 0.1rem 0.4rem;
    border-radius: 10px;
    margin-left: auto;
}

.mobile-menu {
    display: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* ===== 主横幅区域 ===== */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    background: var(--bg-white);
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: var(--primary-light);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-badge .pulse {
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    animation: badgePulse 2s ease-in-out infinite;
}

@keyframes badgePulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.85); }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.title-line {
    display: block;
}

.hero-title .gradient-text {
    color: var(--primary);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.9rem 1.8rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.hero-stats {
    display: flex;
    gap: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-light);
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.stat-unit {
    font-size: 1.25rem;
    color: var(--primary);
    font-weight: 600;
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
}

/* ===== 主视觉区域 ===== */
.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-image-wrap {
    position: relative;
    width: 100%;
    max-width: 520px;
    aspect-ratio: 16 / 11;
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    background: var(--bg-light);
    box-shadow: var(--shadow-xl);
    transition: transform 0.5s ease, box-shadow 0.5s ease;
}

.hero-image-wrap:hover {
    transform: translateY(-6px);
    box-shadow: 0 30px 45px -15px rgba(37, 99, 235, 0.25);
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.6s ease;
}

.hero-image-wrap:hover .hero-image {
    transform: scale(1.04);
}

.hero-image-deco {
    position: absolute;
    inset: -1px;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.35), transparent 55%);
    pointer-events: none;
    mix-blend-mode: overlay;
    opacity: 0.7;
}

/* 兼容旧样式，避免未引用类冲突 */
.globe-container,
.globe,
.globe-core,
.globe-ring,
.connection-lines,
.floating-icons,
.f-icon {
    display: none;
}

/* ===== 核心优势区域 ===== */
.features {
    padding: 6rem 2rem;
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    letter-spacing: 2px;
    color: var(--primary);
    margin-bottom: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.section-title {
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.section-title .gradient-text {
    color: var(--primary);
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto 4rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    position: relative;
    transition: all 0.3s ease;
}

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

.feature-icon {
    position: relative;
    width: 64px;
    height: 64px;
    margin-bottom: 1.2rem;
}

.icon-wrapper {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-light) 0%, #e0ecff 100%);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: var(--primary);
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 12px -4px rgba(37, 99, 235, 0.25);
}

/* "稳定可靠" 卡片图标强化样式：环形装饰 + 小标签 */
.feature-card.feature-stable .feature-icon {
    width: 72px;
    height: 72px;
}

.feature-card.feature-stable .icon-wrapper {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 60%, #6366f1 100%);
    color: #ffffff;
    font-size: 1.8rem;
    border-radius: 16px;
    box-shadow: 0 10px 24px -8px rgba(37, 99, 235, 0.55);
}

.feature-card.feature-stable .feature-icon::before {
    content: '';
    position: absolute;
    inset: -6px;
    border-radius: 22px;
    border: 2px dashed rgba(37, 99, 235, 0.35);
    animation: stableSpin 14s linear infinite;
    pointer-events: none;
}

.feature-card.feature-stable .feature-icon::after {
    content: '';
    position: absolute;
    top: -8px;
    right: -8px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: #22c55e;
    box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.18);
    animation: stablePulse 2.4s ease-in-out infinite;
    pointer-events: none;
}

.feature-icon-tag {
    position: absolute;
    bottom: -6px;
    right: -10px;
    padding: 2px 8px;
    background: #ffffff;
    color: var(--primary);
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 999px;
    border: 1px solid var(--primary-light);
    box-shadow: var(--shadow-sm);
    z-index: 2;
}

.feature-card.feature-stable:hover .icon-wrapper {
    transform: rotate(-4deg) scale(1.05);
    box-shadow: 0 14px 30px -8px rgba(37, 99, 235, 0.65);
}

@keyframes stableSpin {
    to { transform: rotate(360deg); }
}

@keyframes stablePulse {
    0%, 100% { box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.18); }
    50%      { box-shadow: 0 0 0 8px rgba(34, 197, 94, 0.05); }
}

.icon-glow {
    display: none;
}

.feature-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.6rem;
    color: var(--text-primary);
}

.feature-desc {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.feature-stats {
    display: flex;
    gap: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-light);
}

.mini-stat {
    display: flex;
    flex-direction: column;
}

.ms-value {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.ms-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.feature-decoration {
    display: none;
}

/* ===== 技术特性展示 ===== */
.tech-showcase {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.8rem;
    max-width: 1000px;
    margin: 0 auto;
}

.tech-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 1.2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.tech-item:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.tech-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--primary);
}

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

/* ===== 下载区域 ===== */
.download {
    padding: 6rem 2rem;
    background: var(--bg-white);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto 4rem;
}

.download-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
    z-index: 1;
}

.download-card::before {
    display: none;
}

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

.platform-badge {
    width: 72px;
    height: 72px;
    margin: 0 auto 1.2rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.4rem;
    position: relative;
}

.platform-badge::after {
    display: none;
}

[data-platform="windows"] .platform-badge {
    color: #0078d4;
}

[data-platform="android"] .platform-badge {
    color: #3ddc84;
}

[data-platform="ios"] .platform-badge {
    color: #555;
}

.platform-name {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
}

.platform-version {
    color: var(--text-muted);
    margin-bottom: 1.2rem;
    font-size: 0.9rem;
}

.platform-features {
    text-align: left;
    margin-bottom: 1.5rem;
}

.platform-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.platform-features i {
    color: var(--primary);
    font-size: 0.75rem;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    width: 100%;
    padding: 0.85rem 1.5rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    position: relative;
    z-index: 10;
}

.windows-btn,
.android-btn,
.ios-btn {
    background: var(--primary);
    color: #fff;
}

.windows-btn:hover,
.android-btn:hover,
.ios-btn:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-md);
}

.download-btn:hover {
    transform: translateY(-1px);
}

.download-note {
    margin-top: 0.8rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== 二维码区域 ===== */
.qr-section {
    max-width: 800px;
    margin: 0 auto;
    padding: 2.5rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    text-align: center;
}

.qr-info h4 {
    font-size: 1.2rem;
    margin-bottom: 0.4rem;
    font-weight: 600;
    color: var(--text-primary);
}

.qr-info p {
    color: var(--text-secondary);
    margin-bottom: 1.8rem;
    font-size: 0.95rem;
}

.qr-codes {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
}

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

.qr-placeholder {
    width: 140px;
    height: 140px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    margin: 0 auto 0.8rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.qr-placeholder i {
    font-size: 2.2rem;
    color: var(--text-muted);
}

.qr-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* 真实二维码容器 (QRCode.js 会在内部插入 canvas/img/table) */
.qr-box {
    width: 140px;
    height: 140px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 8px;
    margin: 0 auto 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.qr-box:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.qr-box canvas,
.qr-box img {
    display: block;
    width: 124px !important;
    height: 124px !important;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
}

.qr-box.qr-fallback {
    flex-direction: column;
    gap: 0.4rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.qr-box.qr-fallback i {
    font-size: 2.2rem;
}

.qr-soon {
    display: inline-block;
    margin-left: 0.4rem;
    padding: 0.1rem 0.5rem;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 999px;
    vertical-align: middle;
}

.qr-item-disabled .qr-placeholder {
    opacity: 0.6;
    filter: grayscale(0.4);
}

/* ===== 关于我们 ===== */
.about {
    padding: 6rem 2rem;
    background: var(--bg-light);
}

.about-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text .section-tag,
.about-text .section-title {
    text-align: left;
}

.about-desc {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
    font-size: 1rem;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.8rem;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.8rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.about-feature i {
    color: var(--primary);
    font-size: 1rem;
}

.about-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-image-wrap {
    position: relative;
    width: 100%;
    max-width: 480px;
    aspect-ratio: 4 / 3;
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    background: var(--bg-white);
    box-shadow: var(--shadow-xl);
    transition: transform 0.5s ease, box-shadow 0.5s ease;
}

.about-image-wrap:hover {
    transform: translateY(-6px);
    box-shadow: 0 30px 45px -15px rgba(37, 99, 235, 0.25);
}

.about-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.6s ease;
}

.about-image-wrap:hover .about-image {
    transform: scale(1.04);
}

.about-image-deco {
    position: absolute;
    inset: -1px;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.35), transparent 55%);
    pointer-events: none;
    mix-blend-mode: overlay;
    opacity: 0.7;
}

.shield-container {
    position: relative;
    width: 240px;
    height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shield-container,
.shield-inner {
    display: none;
}

.shield-inner {
    width: 160px;
    height: 160px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.shield-particles {
    display: none;
}

/* ===== 联系客服 ===== */
.contact {
    padding: 6rem 2rem;
    background: var(--bg-white);
}

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

.contact-methods {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

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

.contact-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 1rem;
    background: var(--primary-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
    position: relative;
}

.qq-card .contact-icon { color: #12b7f5; background: #e0f2fe; }
.email-card .contact-icon { color: var(--primary); background: var(--primary-light); }
.telegram-card .contact-icon { color: #229ED9; background: #e0f2fe; }

.contact-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.4rem;
    font-weight: 600;
    color: var(--text-primary);
}

.contact-number {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
    word-break: break-all;
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.qq-btn,
.email-btn,
.telegram-btn {
    background: var(--primary);
    color: #fff;
}

.qq-btn:hover,
.email-btn:hover,
.telegram-btn:hover {
    background: var(--primary-dark);
    color: #fff;
    box-shadow: var(--shadow-md);
}

.contact-hours {
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.contact-hours i {
    color: var(--text-muted);
    margin-right: 0.3rem;
}

.contact-cta {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
}

.cta-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.cta-content p {
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
    font-size: 0.95rem;
}

.cta-number {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.4rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.cta-number i {
    color: var(--primary);
}

/* ===== 页脚 ===== */
.footer {
    padding: 3.5rem 2rem 1.5rem;
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2.5rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.footer-column h5 {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 600;
}

.footer-column ul li {
    margin-bottom: 0.6rem;
}

.footer-column ul a {
    color: var(--text-secondary);
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

.footer-column ul a:hover {
    color: var(--primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.copyright {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-social {
    display: flex;
    gap: 0.6rem;
}

.social-link {
    width: 36px;
    height: 36px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.social-link:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ===== 弹窗 ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow-xl);
    animation: modalFade 0.25s ease;
}

@keyframes modalFade {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.modal-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.2rem;
    background: var(--primary-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--primary);
}

.modal-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-content p {
    color: var(--primary);
    font-size: 1.05rem;
    margin-bottom: 0.8rem;
    font-weight: 500;
}

.modal-desc {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem !important;
    font-size: 0.9rem !important;
}

.modal-close {
    padding: 0.7rem 1.6rem;
    background: var(--primary);
    border: none;
    border-radius: 6px;
    color: #fff;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: var(--primary-dark);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 6rem;
    }

    .hero-content { max-width: 100%; }

    .hero-cta { justify-content: center; }

    .hero-stats { justify-content: center; }

    .hero-visual { margin-top: 3rem; }

    .hero-image-wrap { max-width: 420px; }

    .features-grid { grid-template-columns: 1fr; max-width: 480px; }

    .download-grid { grid-template-columns: 1fr; max-width: 380px; }

    .about-content { grid-template-columns: 1fr; text-align: center; }

    .about-text .section-tag,
    .about-text .section-title { text-align: center; }

    .about-features { justify-content: center; }

    .contact-methods {
        grid-template-columns: repeat(3, 1fr);
        max-width: 720px;
        margin-left: auto;
        margin-right: auto;
        gap: 1rem;
    }

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

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

    .footer-bottom { flex-direction: column; gap: 1rem; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-actions { display: none; }
    .mobile-menu { display: block; }

    /* 移动端菜单展开时的按钮优化 */
    .nav-actions.mobile-open {
        flex-direction: column;
        gap: 0.8rem;
    }

    .nav-actions.mobile-open .nav-auth {
        flex-direction: column;
        width: 100%;
        gap: 0.6rem;
    }

    .nav-actions.mobile-open .btn-nav {
        width: 100%;
        height: 42px;
        justify-content: center;
        padding: 0 1.1rem;
        font-size: 0.95rem;
    }

    .nav-actions.mobile-open .btn-nav-primary {
        margin-top: 0.2rem;
    }

    .hero-title { font-size: 2.2rem; }
    .section-title { font-size: 1.8rem; }

    .hero-stats { flex-direction: column; gap: 1.2rem; }

    .hero-image-wrap { max-width: 100%; aspect-ratio: 4 / 3; }

    .qr-codes { flex-direction: column; gap: 1.5rem; }

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

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

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