/* ==================== 
   基础样式和变量 
   ==================== */
:root {
    --primary-color: #3B82F6;
    --primary-dark: #2563EB;
    --secondary-color: #60A5FA;
    --accent-color: #0EA5E9;
    --accent-light: #38BDF8;
    --text-dark: #2d3748;
    --text-light: #718096;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --gradient-1: linear-gradient(135deg, #3B82F6 0%, #60A5FA 100%);
    --gradient-2: linear-gradient(135deg, #0EA5E9 0%, #38BDF8 100%);
    --gradient-3: linear-gradient(135deg, #2563EB 0%, #60A5FA 100%);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    background-color: var(--bg-white);
}

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

/* ==================== 
   导航栏 
   ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    text-decoration: none;
}

.logo-img {
    height: 40px;
    width: auto;
    display: block;
}

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

.nav-menu a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-1);
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    gap: 15px;
}

.btn-outline, .btn-primary {
    padding: 10px 25px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    font-size: 0.95rem;
}

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

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

.btn-primary {
    color: white;
    background: var(--gradient-1);
    border: none;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 3px;
    transition: var(--transition);
}

/* ==================== 
   英雄区 
   ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 70px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(14, 165, 233, 0.08) 0%, transparent 50%),
        linear-gradient(135deg, #f5f7fa 0%, #e8f0fe 100%);
    z-index: -1;
    animation: bgPulse 10s ease-in-out infinite;
}

@keyframes bgPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.95;
    }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    padding: 60px 0;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 0;
}

.hero-tagline {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 25px;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    display: inline-block;
    animation: textShine 3s ease-in-out infinite;
}

.gradient-text::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-1);
    border-radius: 2px;
    opacity: 0.3;
}

@keyframes textShine {
    0%, 100% {
        filter: brightness(1);
    }
    50% {
        filter: brightness(1.2);
    }
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 35px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.btn-hero, .btn-hero-outline {
    padding: 15px 40px;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.btn-hero {
    background: var(--gradient-1);
    color: white;
    box-shadow: 
        var(--shadow-lg),
        0 0 30px rgba(59, 130, 246, 0.3);
    position: relative;
    overflow: hidden;
}

.btn-hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-hero:hover::before {
    width: 300px;
    height: 300px;
}

.btn-hero:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 
        var(--shadow-xl),
        0 0 40px rgba(59, 130, 246, 0.5);
}

.btn-hero-outline {
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    background: transparent;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn-hero-outline::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-1);
    transition: left 0.5s ease;
    z-index: -1;
}

.btn-hero-outline:hover::before {
    left: 0;
}

.btn-hero-outline:hover {
    color: white;
    border-color: transparent;
    transform: translateY(-3px) scale(1.05);
    box-shadow: 
        var(--shadow-lg),
        0 0 30px rgba(59, 130, 246, 0.4);
}

/* 数据统计 */
.hero-stats {
    display: flex;
    gap: 40px;
    margin: 35px 0;
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ==================== 
   设备展示区（炫酷双手机）
   ==================== */
.hero-devices {
    position: relative;
    height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 60px;
    perspective: 1000px;
}

.device-phone {
    position: relative;
    width: 300px;
    z-index: 2;
    animation: float 8s ease-in-out infinite;
    transition: transform 0.5s ease;
}

.device-phone:hover {
    transform: translateY(-20px) scale(1.05);
    z-index: 10;
}

.left-phone {
    animation-delay: 0s;
}

.right-phone {
    animation-delay: -4s;
}

/* 发光效果 */
.phone-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, 
        rgba(59, 130, 246, 0.3) 0%, 
        rgba(59, 130, 246, 0) 70%);
    border-radius: 50%;
    filter: blur(30px);
    z-index: 0;
    animation: pulse 3s ease-in-out infinite;
}

.right-phone .phone-glow {
    background: radial-gradient(circle, 
        rgba(14, 165, 233, 0.3) 0%, 
        rgba(14, 165, 233, 0) 70%);
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

/* 手机外壳 */
.phone-shell {
    position: relative;
    width: 100%;
    aspect-ratio: 9/19;
    background: linear-gradient(145deg, #1a1a1a 0%, #2d2d2d 100%);
    border-radius: 42px;
    padding: 12px;
    box-shadow: 
        0 30px 80px rgba(0, 0, 0, 0.4),
        0 0 0 1px rgba(255, 255, 255, 0.1),
        inset 0 1px 2px rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

/* 刘海 */
.phone-notch {
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 28px;
    background: #000;
    border-radius: 0 0 20px 20px;
    z-index: 3;
    box-shadow: inset 0 -2px 4px rgba(255, 255, 255, 0.1);
}

.phone-notch::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

/* 屏幕 */
.phone-screen {
    width: 100%;
    height: 100%;
    background: #000;
    border-radius: 32px;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
}

.phone-screen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* 设备标签 */
.device-label {
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 8px 24px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* 装饰圆圈 */
.hero-decoration {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 0;
}

.deco-circle {
    position: absolute;
    border-radius: 50%;
    border: 2px solid;
    opacity: 0.1;
    animation: rotate 20s linear infinite;
}

.circle-1 {
    width: 400px;
    height: 400px;
    border-color: var(--primary-color);
    top: -100px;
    right: -100px;
}

.circle-2 {
    width: 300px;
    height: 300px;
    border-color: var(--secondary-color);
    bottom: -50px;
    left: -50px;
    animation-direction: reverse;
    animation-duration: 15s;
}

.circle-3 {
    width: 200px;
    height: 200px;
    border-color: var(--accent-color);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-duration: 10s;
}

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


.screenshot-placeholder {
    width: 100%;
    height: 100%;
    position: relative;
}

.screenshot-header {
    padding: 12px 20px;
    color: white;
}

.time {
    font-size: 0.9rem;
    font-weight: 700;
}

.screenshot-content {
    padding: 25px 20px;
}

.content-card {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
}

.content-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 15px;
}

.course-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: white;
    border-radius: 10px;
    margin-bottom: 10px;
}

.time-text {
    font-size: 0.8rem;
    color: #9ca3af;
}

.course-name-text {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.stat-box {
    flex: 1;
    background: linear-gradient(135deg, #4ECDC4 0%, #45B7D1 100%);
    padding: 20px 15px;
    border-radius: 15px;
    text-align: center;
    color: white;
}

.stat-num {
    font-size: 1.2rem;
    font-weight: 800;
    margin-bottom: 5px;
}

.stat-text {
    font-size: 0.75rem;
    opacity: 0.95;
}

/* PC模型 */
.pc-mockup {
    width: 520px;
    height: 340px;
    z-index: 1;
    flex-shrink: 0;
    animation: float 6s ease-in-out infinite;
    animation-delay: -3s;
}

.pc-frame {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 8px;
    padding: 0;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15),
                0 0 0 1px rgba(0, 0, 0, 0.08);
}

.pc-header {
    height: 32px;
    background: linear-gradient(to bottom, #f5f5f5 0%, #e8e8e8 100%);
    border-radius: 8px 8px 0 0;
    display: flex;
    align-items: center;
    padding: 0 12px;
    gap: 6px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.5);
}

.dot.red {
    background: linear-gradient(135deg, #ff6057 0%, #ff3b30 100%);
}

.dot.yellow {
    background: linear-gradient(135deg, #ffbd2e 0%, #ffaa00 100%);
}

.dot.green {
    background: linear-gradient(135deg, #28cd41 0%, #25c039 100%);
}

.pc-screen-img {
    width: 100%;
    height: calc(100% - 32px);
    background: white;
    border-radius: 0 0 8px 8px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pc-screen-img img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover !important;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s ease-in-out infinite;
}

.scroll-indicator span {
    display: block;
    width: 30px;
    height: 50px;
    border: 2px solid var(--primary-color);
    border-radius: 25px;
    position: relative;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: scroll 2s infinite;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

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

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
}

/* 动画效果 */
.fade-in {
    animation: fadeIn 0.8s ease-out;
}

.fade-in-delay-1 {
    animation: fadeIn 0.8s ease-out 0.2s backwards;
}

.fade-in-delay-2 {
    animation: fadeIn 0.8s ease-out 0.4s backwards;
}

.fade-in-delay-3 {
    animation: fadeIn 0.8s ease-out 0.6s backwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== 
   通用区块样式 
   ==================== */
section {
    padding: 100px 0;
}

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

.section-tag {
    display: inline-block;
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-top: 10px;
}

/* ==================== 
   6大模块 
   ==================== */
.modules {
    background: var(--bg-light);
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.module-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

.module-card:hover {
    transform: translateY(-10px);
    box-shadow: 
        var(--shadow-lg),
        0 10px 30px rgba(59, 130, 246, 0.15);
}

.module-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: var(--transition);
}

.module-card:hover .module-icon {
    transform: scale(1.1);
}

.module-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-dark);
}

/* ==================== 
   主要特色 
   ==================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    background: white;
    border-radius: 20px;
    padding: 50px 40px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature-icon-large {
    width: 100px;
    height: 100px;
    margin: 0 auto 30px;
    background: linear-gradient(135deg, #3B82F615, #60A5FA15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    transition: var(--transition);
}

.feature-card:hover .feature-icon-large {
    transform: scale(1.1);
    background: var(--gradient-1);
    color: white;
}

.feature-content {
    text-align: center;
}

.feature-content h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-dark);
}

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

.feature-highlight {
    display: inline-block;
    padding: 8px 20px;
    background: var(--gradient-1);
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

/* ==================== 
   产品展示区 
   ==================== */
.product-showcase {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.showcase-hero {
    position: relative;
}

.showcase-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    align-items: center;
}

.showcase-text {
    z-index: 2;
}

.showcase-title {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1.2;
    color: white;
    margin-bottom: 40px;
    text-shadow: 2px 2px 8px rgba(59, 130, 246, 0.3);
}

.showcase-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 40px;
}

.feature-point {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.showcase-subtitle {
    font-size: 1.3rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.showcase-phones {
    position: relative;
    height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.phone-display {
    position: absolute;
    width: 280px;
    background: #f8f9fa;
    border-radius: 35px;
    padding: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 
                0 0 0 1px rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.phone-display:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
    z-index: 10;
}

.phone-display img {
    width: 100%;
    height: auto;
    border-radius: 25px;
    display: block;
}

.phone-1 {
    left: -20px;
    top: 50%;
    transform: translateY(-50%) rotate(-5deg);
    z-index: 3;
}

.phone-2 {
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
}

.phone-3 {
    right: -20px;
    top: 50%;
    transform: translateY(-50%) rotate(5deg);
    z-index: 1;
}

/* ==================== 
   会员端小程序 
   ==================== */
.member-app {
    background: var(--bg-light);
}

.app-features {
    display: grid;
    gap: 40px;
}

.app-feature {
    background: white;
    padding: 50px;
    border-radius: 25px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.app-feature:hover {
    box-shadow: var(--shadow-xl);
}

.app-feature-icon {
    font-size: 4rem;
    margin-bottom: 25px;
}

.app-feature h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.app-feature p {
    font-size: 1.05rem;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 25px;
}

.app-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tag {
    padding: 8px 18px;
    background: linear-gradient(135deg, #667eea15, #764ba215);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* ==================== 
   管理端 
   ==================== */
.management-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.management-card {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.management-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.management-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.management-card .subtitle {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 400;
}

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

.management-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag-small {
    padding: 6px 14px;
    background: var(--bg-light);
    color: var(--text-light);
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* ==================== 
   应用场景 
   ==================== */
.scenarios {
    background: var(--bg-light);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 25px;
}

.scenario-card {
    background: white;
    padding: 35px 20px;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    cursor: pointer;
}

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

.scenario-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    transition: var(--transition);
}

.scenario-card:hover .scenario-icon {
    transform: scale(1.15);
}

.scenario-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
}

/* ==================== 
   CTA区 
   ==================== */
.cta {
    position: relative;
    padding: 100px 0;
    text-align: center;
    overflow: hidden;
}

.cta-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-1);
    z-index: -1;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
}

.cta-benefits {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 35px;
    flex-wrap: wrap;
}

.benefit-item {
    color: white;
    font-size: 1rem;
    font-weight: 500;
}

.btn-cta {
    display: inline-block;
    padding: 18px 50px;
    background: white;
    color: var(--primary-color);
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    box-shadow: var(--shadow-xl);
    transition: var(--transition);
}

.btn-cta:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

/* ==================== 
   联系我们 
   ==================== */
.contact {
    background: var(--bg-light);
}

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

.contact-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 50px;
    color: var(--text-dark);
    text-align: center;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.contact-left {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    padding: 25px;
    background: white;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
}

.contact-icon {
    font-size: 2.5rem;
}

.contact-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dark);
}

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

/* 二维码样式 */
.contact-right {
    display: flex;
    justify-content: center;
    align-items: center;
}

.qrcode-container {
    text-align: center;
    padding: 30px;
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid #f0f0f0;
}

.qrcode-container:hover {
    transform: translateY(-8px);
    box-shadow: 
        var(--shadow-lg),
        0 10px 40px rgba(59, 130, 246, 0.15);
    border-color: var(--primary-color);
}

.qrcode-img {
    width: 220px;
    height: 220px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    display: block;
    margin: 0 auto;
}

.qrcode-text {
    margin-top: 20px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: 25px;
    box-shadow: var(--shadow-md);
}

.contact-form h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-dark);
}

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

.form-group input,
.form-group select {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn-submit {
    width: 100%;
    padding: 15px;
    background: var(--gradient-1);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ==================== 
   页脚 
   ==================== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
}

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

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

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ==================== 
   返回顶部按钮 
   ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-1);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

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

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

/* ==================== 
   响应式设计 
   ==================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-devices {
        height: auto;
        flex-direction: column;
        gap: 60px;
        padding: 60px 0;
    }

    .device-phone {
        width: 280px;
    }

    .device-label {
        bottom: -50px;
        font-size: 0.85rem;
        padding: 6px 20px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .qrcode-img {
        width: 180px;
        height: 180px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        padding: 40px;
        gap: 20px;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
    }

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

    .nav-actions {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-tagline {
        font-size: 1.2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

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

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

    .btn-hero, .btn-hero-outline {
        width: 100%;
        text-align: center;
    }

    .hero-image-wrapper {
        height: 300px;
    }

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

    .showcase-title {
        font-size: 2rem;
        text-align: center;
    }

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

    .showcase-subtitle {
        text-align: center;
        font-size: 1.1rem;
    }

    .showcase-phones {
        height: 400px;
        margin-top: 40px;
    }

    .phone-display {
        width: 200px;
        padding: 8px;
    }

    .phone-1 {
        left: 0;
        transform: translateY(-50%) rotate(-8deg) scale(0.9);
    }

    .phone-2 {
        transform: translate(-50%, -50%) scale(0.95);
    }

    .phone-3 {
        right: 0;
        transform: translateY(-50%) rotate(8deg) scale(0.9);
    }

    .section-title {
        font-size: 2rem;
    }

    .modules-grid,
    .features-grid,
    .scenarios-grid,
    .management-grid {
        grid-template-columns: 1fr;
    }

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

    .showcase-title {
        font-size: 2rem;
        text-align: center;
    }

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

    .showcase-subtitle {
        text-align: center;
        font-size: 1.1rem;
    }

    .showcase-phones {
        height: 400px;
        margin-top: 40px;
    }

    .phone-display {
        width: 200px;
        padding: 8px;
    }

    .phone-1 {
        left: 0;
        transform: translateY(-50%) rotate(-8deg) scale(0.9);
    }

    .phone-2 {
        transform: translate(-50%, -50%) scale(0.95);
    }

    .phone-3 {
        right: 0;
        transform: translateY(-50%) rotate(8deg) scale(0.9);
    }

    .app-feature,
    .management-card {
        padding: 30px;
    }

    .contact-form {
        padding: 30px;
    }

    .cta-benefits {
        flex-direction: column;
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

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

    .btn-hero, .btn-hero-outline {
        padding: 12px 30px;
        font-size: 1rem;
    }

    .cta-content h2 {
        font-size: 2rem;
    }

    section {
        padding: 60px 0;
    }
}