/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 颜色系统 - 参考Gemini风格 */
    --primary-blue: #1a73e8;
    --secondary-blue: #4285f4;
    --accent-purple: #8ab4f8;
    --gradient-start:#8ab4f8;
    --gradient-end: #1a73e8;
    
    /* 中性色 */
    --white: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f4;
    --gray-200: #e8eaed;
    --gray-300: #dadce0;
    --gray-400: #bdc1c6;
    --gray-500: #9aa0a6;
    --gray-600: #80868b;
    --gray-700: #5f6368;
    --gray-800: #3c4043;
    --gray-900: #202124;
    
    /* 字体系统 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* 间距系统 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* 阴影系统 */
    --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    --shadow-md: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
    --shadow-lg: 0 2px 8px 0 rgba(60, 64, 67, 0.3), 0 6px 16px 6px rgba(60, 64, 67, 0.15);
    
    /* 圆角系统 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;
    --navbar-height: 70px;
    
    /* 动画 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 基础样式 */
body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--white);
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

#home, #features, #pricing, #demo, #about {
    scroll-margin-top: var(--navbar-height);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-logo h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtitle {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    font-weight: 500;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    margin: 0 auto;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    transition: var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--gray-700);
    margin: 3px 0;
    transition: var(--transition-fast);
}

.nav-actions {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.nav-cta {
    padding: var(--spacing-sm) var(--spacing-lg);
}

/* 首页英雄区域 */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: none;
}

.hero-bg-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -2;
    pointer-events: none;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-3xl) var(--spacing-lg);
    display: grid;
    grid-template-columns:  1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    justify-items: center;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-size-xl);
    color: var(--gray-900);
    font-weight: 600;
    letter-spacing: 0.01em;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.7;
}

.hero-content {
    text-align: center;
    max-width: 1600px;
    min-width: 800px;
    min-height: 400px;;
    margin: 0 auto;
    padding: var(--spacing-3xl) var(--spacing-2xl);
    border-radius: var(--radius-xl);
    background: radial-gradient(ellipse at center,
        rgba(232, 240, 254, 0.85) 0%,
        rgba(232, 240, 254, 0.65) 40%,
        rgba(232, 240, 254, 0.0) 70%
    ); 
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin: 0 auto;
}

.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 120px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

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

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

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

/* 定价卡片按钮样式 */
.pricing-card .btn {
    width: 100%;
    margin-top: auto;
}

.hero-video {
    display: flex;
    justify-content: center;
    align-items: center;
}

.video-placeholder {
    width: 100%;
    max-width: 500px;
    height: 300px;
    background: linear-gradient(135deg, var(--gray-100), var(--gray-200));
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.video-placeholder:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.play-button {
    width: 60px;
    height: 60px;
    background: var(--white);
    border-radius: var(--radius-full);
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-md);
    color: var(--primary-blue);
    box-shadow: var(--shadow-md);
    transition: var(--transition-fast);
}

.play-button:hover {
    transform: scale(1.1);
}

.play-button.large {
    width: 80px;
    height: 80px;
}

/* 背景浮动元素 */
.hero-bg-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.floating-element {
    position: absolute;
    border-radius: var(--radius-full);
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.element-1 {
    width: 80px;
    height: 80px;
    background: var(--primary-blue);
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.element-2 {
    width: 120px;
    height: 120px;
    background: var(--accent-purple);
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.element-3 {
    width: 60px;
    height: 60px;
    background: var(--secondary-blue);
    bottom: 20%;
    left: 80%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

/* 功能区域 */
.features-section {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
    min-height: auto;
}

.features-deck {
    display: none;
    grid-template-columns: 1fr 1.7fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.deck-list {
    display: grid;
    gap: var(--spacing-lg);
}

.deck-item {
    border: 2px solid var(--gray-300);
    border-radius: 0;
    box-shadow: none;
    padding: var(--spacing-lg);
    background: var(--white);
    transition: transform var(--transition-normal), border-color var(--transition-fast);
}

.deck-item.active { transform: scale(1.03); border-color: var(--primary-blue); }
.deck-title { font-size: var(--font-size-xl); font-weight: 700; margin-bottom: var(--spacing-xs); }
.deck-desc { font-size: var(--font-size-sm); color: var(--gray-600); }

.deck-images {
    position: relative;
    height: 520px;
}

.deck-img {
    position: absolute;
    top: 50%;
    left: 50%;
    height: 100%;
    width: auto;
    max-width: 95%;
    max-height: 100%;
    object-fit: contain;
    background: var(--white);
    transform: translate(-50%, -50%);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-slow), opacity var(--transition-slow);
}

.deck-img.pos0 { z-index: 3; opacity: 1; transform: translate(-50%, -50%) translateZ(30px) scale(1); }
.deck-img.pos1 { z-index: 2; opacity: 0.65; transform: translate(-50%, -50%) translate(50px, 35px) scale(1); }
.deck-img.pos2 { z-index: 1; opacity: 0.35; transform: translate(-50%, -50%) translate(100px, 70px) scale(1); }

/* 核心功能整页滚动 */
.features-fullpage {
    position: relative;
    padding: 0;
    height: 100vh;
    background: var(--white);
}

.features-slider {
    height: calc(100vh - 70px);
    margin-top: 70px; /* 顶部导航高度 */
    overflow-y: auto;
    scroll-snap-type: y mandatory;
}

.feature-slide {
    height: calc(100vh - 70px);
    scroll-snap-align: start;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl) 0;
}

.feature-layout {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.feature-text h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.feature-text p {
    font-size: var(--font-size-lg);
    color: var(--gray-700);
    line-height: 1.8;
}

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

.feature-visual img {
    width: 100%;
    max-width: 640px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.feature-indicators {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
}

.feature-indicators .dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background: var(--gray-300);
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.feature-indicators .dot.active {
    background: var(--primary-blue);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-header h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    background: var(--white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: var(--radius-lg);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--white);
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

.feature-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

.feature-card p a {
    color: var(--gray-600);
    line-height: 1.6;
}

/* 定价区域 */
.pricing-section {
    padding: var(--spacing-3xl) 0;
    background: var(--gray-50);
    overflow: hidden;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    max-width: 1100px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    position: relative;
    transition: var(--transition-normal);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    min-height: 500px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

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

.pricing-card.featured {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-lg);
    transform: scale(1.02);
    z-index: 2;
}

.pricing-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.pricing-header h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-900);
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xl);
}

.currency {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
}

.amount {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--gray-900);
}

.period {
    font-size: var(--font-size-base);
    color: var(--gray-600);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-2xl);
    flex-grow: 1;
    text-align: left;
}

.pricing-features li {
    padding: var(--spacing-sm) 0;
    color: var(--gray-700);
    position: relative;
}

.pricing-features li::before {
    content: '✓';
    color: var(--primary-blue);
    font-weight: bold;
    margin-right: var(--spacing-sm);
}

/* 演示区域 */
.demo-section {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
    min-height: auto;
}

.demo-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.video-showcase {
    display: flex;
    justify-content: center;
}

.video-placeholder.large {
    max-width: 600px;
    height: 400px;
}

.demo-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.demo-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.demo-item p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* 关于区域 */
.about-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--gray-50), #e8f0fe);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-text h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-900);
}

.about-text p {
    font-size: var(--font-size-lg);
    color: var(--gray-700);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.about-stats {
    display: flex;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
    flex-wrap: wrap;
}

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

.about-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow-md);
    min-width: 140px;
    position: relative;
    color: var(--primary-blue);
    transition: var(--transition-fast);
}

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

.about-icon {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
}

.about-text {
    font-weight: 600;
    color: var(--gray-800);
}

.qr-overlay {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.35);
    border-radius: var(--radius-xl);
}

.about-item.wechat:hover .qr-overlay {
    display: flex;
}

.qr-card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.qr-card img {
    width: 160px;
    height: 160px;
    object-fit: contain;
    margin-bottom: var(--spacing-sm);
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.visual-placeholder {
    width: 100%;
    height: 300px; 
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.floating-shapes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: var(--radius-full);
    opacity: 0.3;
    animation: float 8s ease-in-out infinite;
}

.shape-1 {
    width: 60px;
    height: 60px;
    background: var(--primary-blue);
    top: 20%;
    left: 20%;
    animation-delay: 0s;
}

.shape-2 {
    width: 40px;
    height: 40px;
    background: var(--accent-purple);
    top: 60%;
    right: 30%;
    animation-delay: 3s;
}

.shape-3 {
    width: 80px;
    height: 80px;
    background: var(--secondary-blue);
    bottom: 20%;
    left: 50%;
    animation-delay: 6s;
}

/* 页脚 */
.footer {
    background: var(--gray-900);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-brand img {
    width: 70px;
    height: auto;
    margin: 0;
    display: block;
}

.footer-brand-text {
    display: flex;
    flex-direction: column;
}

.footer-brand p {
    color: var(--gray-400);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}


.footer-column h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--white);
}

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

.footer-column li {
    margin-bottom: var(--spacing-sm);
}

.footer-column a {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-column a:hover {
    color: var(--accent-purple);
}

.footer-bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    text-align: center;
    padding-top: var(--spacing-xs);
    border-top: 1px solid var(--gray-700);
    color: var(--gray-500);
    white-space: nowrap;
    flex-wrap: nowrap;
}

.login-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

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

.modal-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    width: 360px;
    max-width: 90%;
    text-align: center;
}

.modal-card img {
    width: 220px;
    height: 220px;
    object-fit: contain;
    margin: var(--spacing-md) 0;
}

.modal-close {
    width: 100%;
}

.modal-switch {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-md);
}

.login-modal .btn {
    min-width: 160px;
    box-shadow: var(--shadow-md);
    padding: var(--spacing-sm);
}

.login-modal .btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.login-modal .btn-outline {
    border-width: 2px;
}

.btn-outline#switch-to-password,
.btn-outline#switch-to-password-2 {
    color: var(--primary-blue);
    border-color: var(--primary-blue);
}

.btn-outline#switch-to-password:hover,
.btn-outline#switch-to-password-2:hover {
    background: var(--primary-blue);
    color: var(--white);
}

.btn-outline#switch-to-sms,
.btn-outline#switch-to-sms-2 {
    color: #FF8F00;
    border-color: #FF8F00;
}

.btn-outline#switch-to-sms:hover,
.btn-outline#switch-to-sms-2:hover {
    background: #FF8F00;
    color: var(--white);
}

.btn-outline#switch-to-wechat-1,
.btn-outline#switch-to-wechat-2 {
    color: #09BB07;
    border-color: #09BB07;
}

.btn-outline#switch-to-wechat-1:hover,
.btn-outline#switch-to-wechat-2:hover {
    background: #09BB07;
    color: var(--white);
}

.login-modal .btn-primary {
    padding: var(--spacing-sm); 
}

.form-field-inline .btn {
    min-width: auto;
    padding: var(--spacing-sm) var(--spacing-md);
}

.form-field {
    margin-bottom: var(--spacing-md);
}

.form-field input {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
}

.form-field-inline {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-sm);
    align-items: center;
}

.form-message {
    margin-top: var(--spacing-sm);
    color: var(--gray-700);
    font-size: var(--font-size-sm);
}

/* 中等屏幕尺寸的响应式调整 */
@media (max-width: 1024px) and (min-width: 769px) {
    .pricing-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
        max-width: 900px;
    }
    
    .pricing-card {
        padding: var(--spacing-lg);
        min-height: 480px;
    }
    
    .pricing-card.featured {
        transform: scale(1.01);
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-lg);
    }
}

/* 响应式设计 */
.accordion {
    display: grid;
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}
.accordion.vertical .accordion-item { display: block; }

.accordion-header {
    width: 100%;
    display: flex;
    align-items: flex-start;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background: var(--white);
    color: var(--gray-900);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
}

.accordion-header::after {
    content: '▾';
    color: var(--gray-700);
    transform: rotate(0deg);
    transition: var(--transition-fast);
}

.accordion-header[aria-expanded="true"] {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-md);
}

.accordion-header[aria-expanded="true"]::after {
    transform: rotate(180deg);
    color: var(--primary-blue);
}

.accordion-panel {
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transition: max-height var(--transition-slow), opacity var(--transition-normal);
    border: 1px solid var(--gray-200);
    border-top: none;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    padding: 0 var(--spacing-xl);
}

.accordion-panel .feature-layout {
    padding: var(--spacing-xl) 0;
}

/* 手风琴卡片内容，支持3D倾斜与前景视差 */
.accordion-card {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    padding: var(--spacing-xl) 0;
    transform-style: preserve-3d;
}

.header-texts { display: grid; gap: var(--spacing-xs); }
.header-title { font-size: var(--font-size-xl); font-weight: 700; }
.header-desc { font-size: var(--font-size-sm); color: var(--gray-600); line-height: 1.6; }

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
        order: 0;
        margin-right: var(--spacing-md);
    }
    
    .nav-container { justify-content: flex-start; }
    .nav-logo { order: 1; }
    .nav-actions { order: 2; margin-left: auto; }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-2xl);
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }

    .feature-layout {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-xl);
    }

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

    .about-content { grid-template-columns: 1fr; }
    .about-content > .about-text { order: 1; }
    .about-content > .about-visual { order: 2; }
    .about-stats { justify-content: center; }
    .about-item { padding: var(--spacing-md); min-width: 120px; }
    .about-icon { width: 56px; height: 56px; }
}

@media (min-width: 768px) {
    .features-deck { display: grid; }
    #features-accordion { display: none; }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .features-deck { grid-template-columns: 0.9fr 1.4fr; }
    .deck-images { height: 460px; }
    .deck-list { max-width: 520px; }
    .deck-item { padding: var(--spacing-md); }
    .header-title { font-size: var(--font-size-lg); }
    .header-desc { font-size: var(--font-size-xs); }
}

@media (max-width: 767px) {
    .features-deck { display: grid; grid-template-columns: 1fr; gap: var(--spacing-xl); }
    #features-accordion { display: none; }
    .deck-images { height: 360px; }
    .deck-list { gap: var(--spacing-md); }
    .deck-item { padding: var(--spacing-md); border-width: 1px; }
    .header-title { font-size: var(--font-size-lg); }
    .header-desc { font-size: var(--font-size-xs); }


    .feature-visual img {
        max-width: 90%;
    }
}
    
@media (max-width: 767px) {
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    .pricing-card { min-height: auto; }
    .pricing-card.featured { transform: none; order: 0; }
    .demo-content { grid-template-columns: 1fr; text-align: center; }
    .about-content { grid-template-columns: 1fr; text-align: center; }
    .about-stats { justify-content: center; }
    .about-visual { background: url(assets/see4.jpg) center / cover no-repeat; border-radius: var(--radius-xl); }
}

@media (max-width: 500px) {
    .demo-content { grid-template-columns: 1fr; }
    .demo-content > .video-showcase { order: 1; }
    .demo-content > .demo-features { order: 2; }
    .about-item { padding: var(--spacing-sm); min-width: 96px; }
    .about-icon { width: auto; height: 40px; }
    .about-text h2 { font-size: var(--font-size-3xl); }
    .about-text p { font-size: var(--font-size-base); }
    .about-stats { gap: var(--spacing-lg); margin-top: var(--spacing-lg); }
}
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        justify-content: center;
    }
    
    .footer-links {
        /* grid-template-columns: 1fr; */
        text-align: center;
    }

    .hero-content {
        text-align: center;
        max-width: 768px;
        min-width: 400px;
        min-height: 300px;;
        margin: 0 auto;
        padding: var(--spacing-3xl) var(--spacing-2xl);
        border-radius: var(--radius-xl);
        background: radial-gradient(ellipse at center,
            rgba(232, 240, 254, 0.85) 0%,
            rgba(232, 240, 254, 0.65) 40%,
            rgba(232, 240, 254, 0.0) 70%
        ); 
    }
    .footer-bottom{
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: center;
        gap: var(--spacing-sm);
        white-space: nowrap;
        flex-wrap: nowrap;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-container {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-description {
        font-size: var(--font-size-base);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
}

/* 滚动动画 */
@media (prefers-reduced-motion: no-preference) {
    .feature-card,
    .pricing-card {
        opacity: 0;
        transform: translateY(30px);
        animation: fadeInUp 0.6s ease forwards;
    }
    
    .feature-card:nth-child(1) { animation-delay: 0.1s; }
    .feature-card:nth-child(2) { animation-delay: 0.2s; }
    .feature-card:nth-child(3) { animation-delay: 0.3s; }
    .feature-card:nth-child(4) { animation-delay: 0.4s; }
    
    .pricing-card:nth-child(1) { animation-delay: 0.1s; }
    .pricing-card:nth-child(2) { animation-delay: 0.2s; }
    .pricing-card:nth-child(3) { animation-delay: 0.3s; }
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-full);
    border-top-color: var(--primary-blue);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}
.feature-showcase {
    position: relative;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    perspective: 1200px;
    padding-bottom: var(--spacing-3xl);
}

.showcase-track {
    display: flex;
    transform: translateX(0);
    transition: transform var(--transition-slow);
}

.showcase-card {
    min-width: 100%;
    transform-style: preserve-3d;
    padding: var(--spacing-2xl) var(--spacing-lg);
    filter: saturate(0.9);
}

.showcase-card.active {
    filter: saturate(1);
}

.showcase-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    background: radial-gradient(1200px 400px at 30% 30%, rgba(232,240,254,0.9), rgba(232,240,254,0.2));
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-2xl);
    transform: rotateY(0deg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.showcase-card.active .showcase-content {
    box-shadow: 0 20px 40px rgba(0,0,0,0.12);
}

.feature-text h3 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.feature-text p {
    font-size: var(--font-size-lg);
    color: var(--gray-700);
    line-height: 1.8;
}

.feature-visual {
    display: grid;
    place-items: center;
}

.feature-visual img {
    width: 100%;
    max-width: 640px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transform: translateZ(0) scale(1);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.showcase-card.active .feature-visual img {
    transform: translateZ(30px) scale(1.02);
}

.showcase-nav {
    position: absolute;
    inset: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
}

.showcase-nav .prev,
.showcase-nav .next {
    pointer-events: auto;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    border: none;
    background: var(--white);
    box-shadow: var(--shadow-md);
    color: var(--gray-800);
    font-size: 24px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.showcase-nav .prev:hover,
.showcase-nav .next:hover { transform: scale(1.05); }

.showcase-nav .prev { margin-left: var(--spacing-md); }
.showcase-nav .next { margin-right: var(--spacing-md); }

.showcase-dots {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-xl);
}

.showcase-dots button {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    border: none;
    background: var(--gray-300);
    cursor: pointer;
    transition: var(--transition-fast);
}

.showcase-dots button.active { background: var(--primary-blue); }
.section-divider {
    height: 1px;
    margin: var(--spacing-2xl) 0;
    background: linear-gradient(90deg, transparent 0%, var(--gray-200) 20%, var(--gray-300) 50%, var(--gray-200) 80%, transparent 100%);
    opacity: 0.9;
}
@media (max-width: 550px) {
    .pricing-section { padding: var(--spacing-xl) 0; }
    .pricing-grid { grid-template-columns: 1fr; gap: var(--spacing-sm); }
    .pricing-card { min-height: auto; padding: var(--spacing-md); }
    .pricing-header h3 { font-size: var(--font-size-lg); margin-bottom: var(--spacing-md); }
    .price { gap: var(--spacing-xs); margin-bottom: var(--spacing-md); }
    .currency { font-size: var(--font-size-sm); }
    .amount { font-size: var(--font-size-3xl); }
    .period { font-size: var(--font-size-sm); }
}
@media (min-width: 768px) {
    .demo-content { grid-template-columns: 2fr 1fr; align-items: center; gap: var(--spacing-3xl); }
    .demo-section { padding: var(--spacing-4xl) 0; min-height: auto; }
    .video-placeholder.large { max-width: 720px; height: 520px; }
    .about-content { grid-template-columns: 1.6fr 1fr; align-items: center; gap: var(--spacing-3xl); }
    .about-stats { justify-content: flex-start; flex-wrap: nowrap; }
    .footer-content { grid-template-columns: 1fr 2fr; align-items: center; gap: var(--spacing-3xl); text-align: left; }
    .footer-links { grid-template-columns: repeat(3, 1fr); text-align: left; justify-items: start; }
}