/* 爱思助手网站 - 完整样式 */

/* ============ 变量定义 ============ */
:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --accent: #f093fb;
    --dark: #1a1a2e;
    --darker: #16213e;
    --gray-900: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;
    --white: #ffffff;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-xl: 0 50px 100px -20px rgb(0 0 0 / 0.25);
    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
}

/* ============ 重置样式 ============ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-700);
    background: var(--white);
    overflow-x: hidden;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: all 0.3s;
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

button {
    cursor: pointer;
    border: none;
    outline: none;
}

/* ============ 通用组件 ============ */
.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.section-header p {
    font-size: 18px;
    color: var(--gray-500);
}

/* ============ 顶部公告栏 ============ */
.top-bar {
    background: linear-gradient(90deg, var(--dark) 0%, var(--darker) 100%);
    padding: 8px 0;
    font-size: 13px;
}

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

.announcement {
    color: var(--accent);
}

.announcement i {
    margin-right: 8px;
}

.top-links {
    display: flex;
    gap: 20px;
}

.top-links a {
    color: var(--gray-300);
}

.top-links a:hover {
    color: var(--white);
}

/* ============ 导航栏 ============ */
.site-header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--primary);
    font-size: 24px;
    font-weight: 700;
}

.logo-icon {
    font-size: 28px;
}

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

.main-nav {
    display: flex;
    gap: 36px;
}

.main-nav a {
    color: var(--gray-700);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

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

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

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

.header-download-btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white) !important;
    padding: 10px 24px !important;
    border-radius: var(--radius-full);
    font-weight: 600 !important;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.header-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

.header-download-btn::after {
    display: none !important;
}

.mobile-menu-btn {
    display: none;
    background: none;
    font-size: 24px;
    color: var(--gray-700);
}

/* ============ Hero 区域 ============ */
.hero {
    position: relative;
    padding: 80px 0 120px;
    background: linear-gradient(135deg, var(--dark) 0%, var(--darker) 50%, var(--primary-dark) 100%);
    color: var(--white);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.hero-text {
    flex: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    font-size: 14px;
    margin-bottom: 24px;
}

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

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

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero-desc {
    font-size: 18px;
    color: var(--gray-300);
    margin-bottom: 32px;
    max-width: 520px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 36px;
}

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

.stat-num {
    font-size: 36px;
    font-weight: 700;
    color: var(--accent);
}

.stat-item p {
    font-size: 14px;
    color: var(--gray-400);
    margin-top: 4px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.btn-hero-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 16px 32px;
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 600;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
    transition: all 0.3s;
}

.btn-hero-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.5);
    color: var(--white);
}

.btn-hero-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    padding: 16px 32px;
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s;
}

.btn-hero-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.hero-trust {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--gray-400);
}

.hero-trust i {
    margin-right: 4px;
    color: var(--success);
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
}

.software-preview {
    width: 380px;
    background: var(--dark);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.preview-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: #252540;
}

.preview-dots {
    display: flex;
    gap: 6px;
}

.preview-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.preview-dots span:nth-child(1) { background: #ff5f56; }
.preview-dots span:nth-child(2) { background: #ffbd2e; }
.preview-dots span:nth-child(3) { background: #27ca40; }

.preview-title {
    font-size: 13px;
    color: var(--gray-400);
}

.preview-body {
    display: flex;
    height: 300px;
}

.preview-sidebar {
    width: 60px;
    background: #1f1f3a;
    padding: 12px 0;
}

.sidebar-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 12px 0;
    color: var(--gray-400);
    font-size: 11px;
    cursor: pointer;
    transition: all 0.3s;
}

.sidebar-item i {
    font-size: 20px;
}

.sidebar-item:hover,
.sidebar-item.active {
    color: var(--primary);
    background: rgba(102, 126, 234, 0.1);
}

.preview-content {
    flex: 1;
    padding: 16px;
}

.device-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    margin-bottom: 16px;
}

.device-icon {
    font-size: 32px;
    color: var(--primary);
}

.device-info {
    flex: 1;
}

.device-info strong {
    display: block;
    font-size: 14px;
    color: var(--white);
}

.device-info span {
    font-size: 12px;
    color: var(--gray-400);
}

.device-status {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.device-status.online {
    background: var(--success);
    box-shadow: 0 0 10px var(--success);
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.action-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    font-size: 12px;
    color: var(--gray-300);
    cursor: pointer;
}

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

.action-item:hover {
    background: rgba(102, 126, 234, 0.2);
}

.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
}

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

/* ============ 支持设备 ============ */
.supported-devices {
    padding: 80px 0;
    background: var(--gray-50);
}

.supported-devices .section-header h2 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.supported-devices .section-header h2 i {
    color: var(--success);
}

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

.device-support-item {
    background: var(--white);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.device-support-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.device-icon-box {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: 50%;
    font-size: 36px;
    color: var(--primary);
}

.device-support-item h4 {
    font-size: 18px;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.device-support-item p {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 12px;
}

.support-badge {
    display: inline-block;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: var(--white);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
}

/* ============ 核心功能 ============ */
.features {
    padding: 100px 0;
    background: var(--white);
}

.features-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
}

.tab-btn {
    padding: 14px 32px;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: all 0.3s;
}

.tab-btn:hover {
    background: var(--gray-200);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.feature-panel {
    display: none;
}

.feature-panel.active {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    animation: fadeIn 0.5s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.feature-info h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 28px;
    color: var(--gray-900);
    margin-bottom: 20px;
}

.feature-info h3 i {
    color: var(--primary);
}

.feature-info > p {
    font-size: 16px;
    color: var(--gray-600);
    margin-bottom: 28px;
    line-height: 1.8;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    color: var(--gray-700);
}

.feature-list li i {
    color: var(--success);
    font-size: 16px;
}

.feature-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 刷机步骤 */
.mockup-flash {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 40px;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    border-radius: var(--radius-lg);
}

.flash-step {
    text-align: center;
}

.step-num {
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
}

.step-icon {
    width: 70px;
    height: 70px;
    background: var(--white);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--primary);
    box-shadow: var(--shadow);
    margin-bottom: 12px;
}

.step-arrow {
    font-size: 24px;
    color: var(--gray-400);
}

/* 备份类型 */
.backup-types {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.backup-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 24px 16px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    font-size: 14px;
    color: var(--gray-600);
}

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

/* 解锁插画 */
.unlock-illustration {
    padding: 40px;
}

.unlock-phone {
    position: relative;
    width: 200px;
    height: 340px;
    background: var(--dark);
    border-radius: 32px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
    color: var(--gray-600);
}

.unlock-overlay {
    position: absolute;
    inset: 0;
    background: rgba(102, 126, 234, 0.9);
    border-radius: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.unlock-phone:hover .unlock-overlay {
    opacity: 1;
}

.unlock-overlay i {
    font-size: 60px;
    color: var(--white);
}

/* 文件管理 */
.manage-preview {
    padding: 30px;
    background: var(--gray-900);
    border-radius: var(--radius-lg);
}

.folder-tree {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.folder {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    color: var(--white);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.folder:hover {
    background: rgba(102, 126, 234, 0.3);
}

.folder i {
    color: var(--primary);
    font-size: 18px;
}

/* ============ 使用教程 ============ */
.tutorials {
    padding: 100px 0;
    background: var(--gray-50);
}

.tutorial-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.step-card {
    flex: 1;
    max-width: 260px;
    background: var(--white);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.step-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    font-size: 14px;
    font-weight: 700;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.step-card {
    position: relative;
    padding-top: 40px;
}

.step-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: 50%;
    font-size: 32px;
    color: var(--primary);
}

.step-card h4 {
    font-size: 18px;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.step-card p {
    font-size: 14px;
    color: var(--gray-500);
}

.step-connector {
    font-size: 24px;
    color: var(--gray-400);
}

/* ============ 下载区域 ============ */
.download-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--dark) 0%, var(--darker) 100%);
}

.download-box {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 60px;
    align-items: center;
}

.download-left .download-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(240, 147, 251, 0.2);
    color: var(--accent);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 20px;
}

.download-left h2 {
    font-size: 36px;
    color: var(--white);
    margin-bottom: 12px;
}

.download-version {
    color: var(--gray-400);
    margin-bottom: 24px;
}

.download-info {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 32px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-300);
    font-size: 14px;
}

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

.download-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.btn-download-main {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 16px 36px;
    border-radius: var(--radius-full);
    font-size: 16px;
    font-weight: 600;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
    transition: all 0.3s;
}

.btn-download-main:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.5);
    color: var(--white);
}

.btn-download-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    padding: 16px 28px;
    border-radius: var(--radius-full);
    font-size: 14px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s;
}

.btn-download-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.download-hash {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    font-size: 12px;
    color: var(--gray-400);
}

.copy-hash {
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 12px;
    transition: all 0.3s;
}

.copy-hash:hover {
    background: rgba(255, 255, 255, 0.2);
}

.download-right {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.download-qr {
    background: rgba(255, 255, 255, 0.05);
    padding: 24px;
    border-radius: var(--radius-lg);
    text-align: center;
}

.qr-placeholder {
    width: 160px;
    height: 160px;
    margin: 0 auto 16px;
    background: var(--white);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    color: var(--gray-400);
}

.qr-placeholder p {
    font-size: 14px;
    color: var(--gray-600);
    margin-top: 8px;
}

.qr-links {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.qr-links a {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border-radius: var(--radius-full);
    font-size: 13px;
    transition: all 0.3s;
}

.qr-links a:hover {
    background: rgba(255, 255, 255, 0.2);
}

.other-versions {
    display: flex;
    gap: 12px;
}

.version-link {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    transition: all 0.3s;
}

.version-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

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

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
}

.faq-item {
    background: var(--gray-50);
    border-radius: var(--radius);
    overflow: hidden;
}

.faq-question {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    cursor: pointer;
    transition: all 0.3s;
}

.faq-question:hover {
    background: var(--gray-100);
}

.faq-question > i:first-child {
    color: var(--primary);
    font-size: 18px;
}

.faq-question > span {
    flex: 1;
    font-weight: 600;
    color: var(--gray-900);
}

.faq-toggle {
    color: var(--gray-400);
    transition: transform 0.3s;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.8;
}

.faq-more {
    text-align: center;
    margin-top: 40px;
}

.btn-more-faq {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--gray-100);
    color: var(--gray-700);
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: all 0.3s;
}

.btn-more-faq:hover {
    background: var(--primary);
    color: var(--white);
}

/* ============ 最新文章 ============ */
.latest-articles {
    padding: 100px 0;
    background: var(--gray-50);
}

.home-articles {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

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

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.article-card-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.article-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.article-card:hover .article-card-image img {
    transform: scale(1.1);
}

.article-card-content {
    padding: 24px;
}

.article-card-tag {
    display: inline-block;
    padding: 4px 12px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 12px;
}

.article-card-title {
    font-size: 17px;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 12px;
}

.article-card-title a {
    color: var(--gray-900);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card-title a:hover {
    color: var(--primary);
}

.article-card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--gray-400);
}

.article-card-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ============ 页脚 ============ */
.site-footer {
    background: var(--dark);
    color: var(--gray-400);
}

.footer-main {
    padding: 60px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr;
    gap: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-logo i {
    font-size: 28px;
    color: var(--primary);
}

.footer-about p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

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

.footer-social a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    color: var(--gray-400);
    border-radius: 50%;
    transition: all 0.3s;
}

.footer-social a:hover {
    background: var(--primary);
    color: var(--white);
}

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

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

.footer-col ul li a {
    font-size: 14px;
    color: var(--gray-400);
}

.footer-col ul li a:hover {
    color: var(--white);
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    margin-bottom: 12px;
}

.footer-contact i {
    color: var(--primary);
    width: 16px;
}

.footer-qrcode {
    margin-top: 16px;
}

.qr-small {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    font-size: 12px;
    color: var(--gray-400);
}

.qr-small i {
    font-size: 40px;
}

.footer-bottom {
    padding: 24px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    margin-bottom: 8px;
}

.footer-bottom a {
    color: var(--gray-400);
}

.footer-bottom a:hover {
    color: var(--white);
}

/* ============ 回到顶部 ============ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    border-radius: 50%;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* ============ 加载状态 ============ */
.loading {
    text-align: center;
    padding: 60px;
    color: var(--gray-400);
    grid-column: 1 / -1;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 12px;
    vertical-align: middle;
}

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

/* ============ 空状态 ============ */
.empty-state {
    text-align: center;
    padding: 60px;
    background: var(--white);
    border-radius: var(--radius-lg);
    grid-column: 1 / -1;
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-state-title {
    font-size: 18px;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.empty-state-text {
    color: var(--gray-500);
}

/* ============ 文章详情页 ============ */
.article-detail {
    padding: 60px 0;
    min-height: calc(100vh - 400px);
}

.article-detail .container {
    max-width: 900px;
}

.article-header {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 2px solid var(--gray-200);
}

.article-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.4;
    margin-bottom: 20px;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 14px;
    color: var(--gray-500);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-cover {
    margin-bottom: 40px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.article-cover img {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
}

.article-content {
    font-size: 16px;
    line-height: 1.9;
    color: var(--gray-700);
    word-wrap: break-word;
}

.article-content h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--gray-900);
    margin: 30px 0 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--gray-200);
}

.article-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
    margin: 25px 0 12px;
}

.article-content p {
    margin-bottom: 16px;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    margin: 20px 0;
}

.article-content a {
    color: var(--primary);
    text-decoration: underline;
}

.article-content a:hover {
    color: var(--primary-dark);
}

.article-content ul,
.article-content ol {
    margin: 16px 0;
    padding-left: 30px;
}

.article-content li {
    margin-bottom: 8px;
    list-style: disc;
}

.article-content ol li {
    list-style: decimal;
}

.article-content blockquote {
    margin: 20px 0;
    padding: 16px 20px;
    background: var(--gray-50);
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--gray-600);
    font-style: italic;
}

.article-content pre,
.article-content code {
    font-family: 'Fira Code', 'Consolas', monospace;
    background: var(--gray-900);
    color: #e5e7eb;
    border-radius: var(--radius);
}

.article-content code {
    padding: 2px 6px;
    font-size: 14px;
}

.article-content pre {
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
}

.article-content pre code {
    padding: 0;
    background: none;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.article-content th,
.article-content td {
    padding: 12px 16px;
    border: 1px solid var(--gray-200);
    text-align: left;
}

.article-content th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-900);
}

.article-footer {
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--gray-200);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--gray-100);
    color: var(--gray-700);
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: all 0.3s;
}

.back-link:hover {
    background: var(--primary);
    color: var(--white);
}

/* ============ 文章列表页 ============ */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.article-list-item {
    display: flex;
    gap: 24px;
    padding: 24px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s;
}

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

.article-list-image {
    width: 280px;
    height: 180px;
    flex-shrink: 0;
    border-radius: var(--radius);
    overflow: hidden;
}

.article-list-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.article-list-item:hover .article-list-image img {
    transform: scale(1.08);
}

.article-list-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.article-list-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.article-list-title a {
    color: var(--gray-900);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-list-title a:hover {
    color: var(--primary);
}

.article-list-excerpt {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-list-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--gray-400);
}

.article-list-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ============ 分页样式 ============ */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 30px 0;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 14px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--gray-700);
    transition: all 0.3s;
}

.pagination a:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

.pagination .current {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-color: var(--primary);
    color: var(--white);
    font-weight: 600;
}

/* ============ 文章详情页响应式 ============ */
@media (max-width: 768px) {
    .article-detail {
        padding: 40px 0;
    }

    .article-title {
        font-size: 26px;
    }

    .article-meta {
        flex-wrap: wrap;
        gap: 12px;
    }

    .article-list-item {
        flex-direction: column;
    }

    .article-list-image {
        width: 100%;
        height: 200px;
    }

    .pagination a,
    .pagination span {
        min-width: 36px;
        height: 36px;
        font-size: 13px;
    }
}

/* ============ 主响应式 ============ */
@media (max-width: 1200px) {
    .hero-title {
        font-size: 44px;
    }

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

    .footer-about {
        grid-column: 1 / -1;
    }
}

@media (max-width: 992px) {
    .main-nav {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
    }

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

    .hero-desc {
        margin: 0 auto 32px;
    }

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

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

    .hero-trust {
        justify-content: center;
        flex-wrap: wrap;
    }

    .hero-visual {
        width: 100%;
    }

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

    .feature-panel.active {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .tutorial-steps {
        flex-direction: column;
    }

    .step-connector {
        transform: rotate(90deg);
    }

    .download-box {
        grid-template-columns: 1fr;
    }

    .download-right {
        order: -1;
        flex-direction: row;
    }

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

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

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

@media (max-width: 768px) {
    .hero {
        padding: 60px 0 100px;
    }

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

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

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

    .software-preview {
        width: 100%;
        max-width: 380px;
    }

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

    .features-tabs {
        flex-wrap: wrap;
    }

    .tutorial-steps {
        gap: 12px;
    }

    .step-card {
        max-width: 100%;
    }

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

    .download-right {
        flex-direction: column;
    }

    .home-articles {
        grid-template-columns: 1fr;
    }

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

    .section-header h2 {
        font-size: 28px;
    }
}