/* 红桃视频 - 主样式文件 */
/* ========================================
   全局重置与基础样式
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #e8192c;
    --primary-dark: #c0142a;
    --primary-light: #ff4d5e;
    --secondary: #1a1a2e;
    --accent: #ff6b6b;
    --bg-light: #fff5f5;
    --bg-white: #ffffff;
    --text-dark: #1a1a2e;
    --text-gray: #555566;
    --text-light: #888899;
    --border: #f0e0e0;
    --shadow: 0 4px 20px rgba(232,25,44,0.08);
    --shadow-hover: 0 8px 32px rgba(232,25,44,0.18);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif;
    color: var(--text-dark);
    background: var(--bg-white);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

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

ul, ol {
    list-style: none;
}

/* ========================================
   通用组件
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 2px;
    padding: 4px 16px;
    border-radius: 20px;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    line-height: 1.3;
}

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

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    box-shadow: 0 4px 16px rgba(232,25,44,0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(232,25,44,0.4);
    color: #fff;
}

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

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-white {
    background: #fff;
    color: var(--primary);
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    color: var(--primary-dark);
}

/* ========================================
   顶部公告栏
   ======================================== */
.top-bar {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    text-align: center;
    padding: 8px 20px;
    font-size: 13px;
}

.top-bar a {
    color: #fff;
    text-decoration: underline;
    margin-left: 8px;
}

/* ========================================
   页头导航
   ======================================== */
.header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    flex-shrink: 0;
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: #fff;
    font-weight: 900;
}

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

.logo-name {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.logo-slogan {
    font-size: 11px;
    color: var(--text-light);
    line-height: 1;
}

.nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav a {
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    transition: var(--transition);
    white-space: nowrap;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.header-actions .btn {
    padding: 10px 22px;
    font-size: 14px;
}

/* 汉堡菜单 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* ========================================
   搜索框
   ======================================== */
.search-bar-wrap {
    background: var(--bg-light);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}

.search-bar {
    display: flex;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
    background: #fff;
    border: 2px solid var(--border);
    border-radius: 50px;
    overflow: hidden;
    transition: var(--transition);
}

.search-bar:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(232,25,44,0.1);
}

.search-bar input {
    flex: 1;
    border: none;
    outline: none;
    padding: 10px 20px;
    font-size: 14px;
    font-family: inherit;
    background: transparent;
    color: var(--text-dark);
}

.search-bar input::placeholder {
    color: var(--text-light);
}

.search-bar button {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 24px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    transition: var(--transition);
    white-space: nowrap;
}

.search-bar button:hover {
    background: var(--primary-dark);
}

/* ========================================
   首屏 Hero Banner
   ======================================== */
.hero {
    background: linear-gradient(135deg, #1a0a0e 0%, #2d0a14 40%, #1a0a0e 100%);
    position: relative;
    overflow: hidden;
    padding: 80px 0 60px;
    min-height: 580px;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(232,25,44,0.2) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -5%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(232,25,44,0.1) 0%, transparent 70%);
    pointer-events: none;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(232,25,44,0.15);
    border: 1px solid rgba(232,25,44,0.3);
    color: #ff8a94;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 13px;
    margin-bottom: 20px;
}

.hero-badge::before {
    content: '♥';
    font-size: 12px;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 900;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero h1 span {
    color: var(--primary-light);
    display: block;
}

.hero-desc {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.75);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: 32px;
    margin-bottom: 36px;
}

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

.hero-stat-num {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-light);
    line-height: 1;
}

.hero-stat-label {
    font-size: 12px;
    color: rgba(255,255,255,0.6);
    margin-top: 4px;
}

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

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.hero-float-card {
    position: absolute;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 12px 16px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--text-dark);
    font-weight: 600;
    animation: float 3s ease-in-out infinite;
}

.hero-float-card.card1 {
    bottom: 20px;
    left: -20px;
    animation-delay: 0s;
}

.hero-float-card.card2 {
    top: 20px;
    right: -20px;
    animation-delay: 1.5s;
}

.hero-float-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* ========================================
   功能特性
   ======================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

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

.feature-icon {
    width: 72px;
    height: 72px;
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, var(--primary), var(--accent));
}

.feature-img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    border-radius: var(--radius);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* ========================================
   视频卡片区域
   ======================================== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.video-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: #1a1a2e;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.video-card:hover .video-thumb img {
    transform: scale(1.05);
}

.video-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    width: 56px;
    height: 56px;
    background: rgba(232,25,44,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.3s ease;
    backdrop-filter: blur(4px);
}

.video-play-btn::after {
    content: '';
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent #fff;
    margin-left: 4px;
}

.video-card:hover .video-play-btn {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.video-tag {
    position: absolute;
    top: 8px;
    left: 8px;
    background: var(--primary);
    color: #fff;
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 4px;
    font-weight: 600;
}

.video-info {
    padding: 16px;
}

.video-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-light);
}

.video-stats {
    display: flex;
    gap: 12px;
}

.video-stat {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ========================================
   场景应用
   ======================================== */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.scenario-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    border: 1px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
}

.scenario-card:hover {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.scenario-card:hover .scenario-icon,
.scenario-card:hover h4,
.scenario-card:hover p {
    color: #fff;
}

.scenario-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: block;
    transition: var(--transition);
}

.scenario-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
    transition: var(--transition);
}

.scenario-card p {
    font-size: 13px;
    color: var(--text-gray);
    transition: var(--transition);
}

/* ========================================
   使用教程
   ======================================== */
.tutorial-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
}

.tutorial-steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    z-index: 0;
}

.tutorial-step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-num {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 900;
    color: #fff;
    margin: 0 auto 20px;
    box-shadow: 0 4px 16px rgba(232,25,44,0.3);
    border: 4px solid #fff;
}

.tutorial-step h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.tutorial-step p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* ========================================
   更新日志
   ======================================== */
.changelog-list {
    max-width: 800px;
    margin: 0 auto;
}

.changelog-item {
    display: flex;
    gap: 24px;
    padding: 28px 0;
    border-bottom: 1px solid var(--border);
}

.changelog-item:last-child {
    border-bottom: none;
}

.changelog-date {
    flex-shrink: 0;
    width: 100px;
    text-align: right;
}

.changelog-version {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 20px;
    margin-bottom: 6px;
}

.changelog-date-text {
    font-size: 12px;
    color: var(--text-light);
}

.changelog-dot {
    flex-shrink: 0;
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    margin-top: 6px;
    box-shadow: 0 0 0 4px rgba(232,25,44,0.15);
}

.changelog-content h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.changelog-content p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
}

.changelog-tags {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.changelog-tag {
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 20px;
    font-weight: 600;
}

.tag-new { background: #e8f5e9; color: #2e7d32; }
.tag-fix { background: #fff3e0; color: #e65100; }
.tag-improve { background: #e3f2fd; color: #1565c0; }

/* ========================================
   FAQ
   ======================================== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active {
    border-color: var(--primary);
    box-shadow: 0 4px 16px rgba(232,25,44,0.1);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    cursor: pointer;
    background: var(--bg-white);
    transition: var(--transition);
    gap: 16px;
}

.faq-question:hover {
    background: var(--bg-light);
}

.faq-q-text {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    flex: 1;
}

.faq-icon {
    width: 28px;
    height: 28px;
    background: var(--bg-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--primary);
    flex-shrink: 0;
    transition: var(--transition);
    font-weight: 700;
}

.faq-item.active .faq-icon {
    background: var(--primary);
    color: #fff;
    transform: rotate(45deg);
}

.faq-answer {
    display: none;
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
    background: var(--bg-white);
}

.faq-item.active .faq-answer {
    display: block;
}

/* ========================================
   用户评价
   ======================================== */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.review-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
}

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

.review-stars {
    color: #ffc107;
    font-size: 16px;
    margin-bottom: 14px;
    letter-spacing: 2px;
}

.review-text {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 20px;
    font-style: italic;
}

.review-text::before {
    content: '"';
    font-size: 40px;
    color: var(--primary);
    opacity: 0.2;
    line-height: 0;
    vertical-align: -16px;
    margin-right: 4px;
}

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

.reviewer-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #fff;
    font-weight: 700;
    flex-shrink: 0;
}

.reviewer-info strong {
    display: block;
    font-size: 14px;
    color: var(--text-dark);
    font-weight: 700;
}

.reviewer-info span {
    font-size: 12px;
    color: var(--text-light);
}

/* ========================================
   联系我们
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.contact-info p {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 32px;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

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

.contact-item-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-light);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.contact-item-text strong {
    display: block;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.contact-item-text span {
    font-size: 14px;
    color: var(--text-gray);
}

.contact-form {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 36px;
}

.contact-form h4 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    color: var(--text-dark);
    background: #fff;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(232,25,44,0.1);
}

.form-group textarea {
    height: 120px;
    resize: vertical;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--secondary);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand .logo-name {
    color: #fff;
}

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

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

.footer-social a {
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
    text-decoration: none;
}

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

.footer-col h5 {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
}

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

.footer-col ul li a {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    transition: var(--transition);
    text-decoration: none;
}

.footer-col ul li a:hover {
    color: var(--primary-light);
    padding-left: 4px;
}

.footer-bottom {
    padding: 20px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
}

.footer-bottom-left {
    color: rgba(255,255,255,0.5);
}

.footer-bottom-left a {
    color: rgba(255,255,255,0.5);
    margin-left: 16px;
}

.footer-bottom-left a:hover {
    color: var(--primary-light);
}

.footer-update {
    color: rgba(255,255,255,0.4);
    font-size: 12px;
}

/* ========================================
   面包屑
   ======================================== */
.breadcrumb {
    background: var(--bg-light);
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-light);
}

.breadcrumb-list a {
    color: var(--text-light);
}

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

.breadcrumb-list .sep {
    color: var(--border);
}

.breadcrumb-list .current {
    color: var(--text-dark);
    font-weight: 600;
}

/* ========================================
   内页 Hero
   ======================================== */
.page-hero {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    padding: 60px 0;
    text-align: center;
}

.page-hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.page-hero p {
    font-size: 1.05rem;
    opacity: 0.85;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .tutorial-steps::before {
        display: none;
    }

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

@media (max-width: 768px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-image {
        order: -1;
    }

    .hero-float-card {
        display: none;
    }

    .hero-stats {
        gap: 20px;
    }

    .nav {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.1);
        z-index: 999;
    }

    .nav.open {
        display: flex;
    }

    .nav a {
        padding: 12px 16px;
        border-radius: var(--radius);
    }

    .menu-toggle {
        display: flex;
    }

    .header-actions .btn-outline {
        display: none;
    }

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

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

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

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

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

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

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.6rem;
    }

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

@media (max-width: 480px) {
    .scenarios-grid {
        grid-template-columns: 1fr;
    }

    .tutorial-steps {
        grid-template-columns: 1fr;
    }

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

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

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

/* ========================================
   动画
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* ========================================
   滚动条美化
   ======================================== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ========================================
   辅助类
   ======================================== */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.w-full { width: 100%; }