/* ========================================
   Animeko 官网样式表
   配色基于 Logo: 深蓝灰 + 亮蓝 + 白色
   ======================================== */

/* ===== CSS 变量 ===== */
:root {
    --color-primary: #2C3E50;
    --color-primary-dark: #1A252F;
    --color-accent: #5DADE2;
    --color-accent-light: #85C1E9;
    --color-accent-dark: #3498DB;
    --color-white: #FFFFFF;
    --color-bg-light: #F8FAFC;
    --color-bg-section: #F1F5F9;
    --color-text: #2C3E50;
    --color-text-light: #7F8C8D;
    --color-text-muted: #95A5A6;
    --color-border: #E2E8F0;
    --color-shadow: rgba(44, 62, 80, 0.1);
    --color-shadow-lg: rgba(44, 62, 80, 0.15);
    
    --gradient-hero: linear-gradient(135deg, #2C3E50 0%, #34495E 50%, #2C3E50 100%);
    --gradient-accent: linear-gradient(135deg, #5DADE2 0%, #3498DB 100%);
    --gradient-dark: linear-gradient(135deg, #1A252F 0%, #2C3E50 100%);
    
    --shadow-sm: 0 2px 8px rgba(44, 62, 80, 0.08);
    --shadow-md: 0 4px 20px rgba(44, 62, 80, 0.1);
    --shadow-lg: 0 8px 40px rgba(44, 62, 80, 0.15);
    --shadow-xl: 0 20px 60px rgba(44, 62, 80, 0.2);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --container-max: 1200px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ===== 重置 ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", 
                 "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", 
                 Helvetica, Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-white);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* ===== 容器 ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 顶部导航 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

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

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--color-accent);
    background: var(--color-white);
    object-fit: cover;
}

.logo-text {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-text);
}

.nav-link:hover {
    color: var(--color-accent-dark);
    background: rgba(93, 173, 226, 0.1);
}

.nav-link.nav-cta {
    background: var(--gradient-accent);
    color: var(--color-white);
    padding: 10px 24px;
    box-shadow: 0 4px 14px rgba(52, 152, 219, 0.35);
}

.nav-link.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.45);
    background: var(--gradient-accent);
    color: var(--color-white);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== 首屏 Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    background: var(--gradient-hero);
    padding: 120px 0 80px;
    overflow: hidden;
    color: var(--color-white);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(93, 173, 226, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(133, 193, 233, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(52, 152, 219, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-particles {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(2px 2px at 20% 30%, rgba(255,255,255,0.3), transparent),
        radial-gradient(2px 2px at 60% 70%, rgba(255,255,255,0.2), transparent),
        radial-gradient(1px 1px at 50% 50%, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 80% 10%, rgba(255,255,255,0.2), transparent),
        radial-gradient(2px 2px at 90% 60%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 30% 90%, rgba(255,255,255,0.2), transparent),
        radial-gradient(2px 2px at 10% 80%, rgba(255,255,255,0.3), transparent),
        radial-gradient(1px 1px at 70% 40%, rgba(255,255,255,0.2), transparent);
    background-size: 600px 600px;
    animation: particleFloat 20s linear infinite;
    pointer-events: none;
}

@keyframes particleFloat {
    0% { transform: translateY(0); }
    50% { transform: translateY(-30px); }
    100% { transform: translateY(0); }
}

.hero-container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    min-height: calc(100vh - 200px);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(93, 173, 226, 0.15);
    border: 1px solid rgba(93, 173, 226, 0.3);
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--color-accent-light);
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
    animation: fadeInUp 0.6s ease-out;
}

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

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

.hero-title {
    font-size: clamp(2rem, 4.5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease-out 0.1s backwards;
}

.title-highlight {
    background: linear-gradient(135deg, #85C1E9 0%, #5DADE2 50%, #3498DB 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.05rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 32px;
    max-width: 560px;
    animation: fadeInUp 0.6s ease-out 0.2s backwards;
}

.hero-info {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 20px 28px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    margin-bottom: 36px;
    animation: fadeInUp 0.6s ease-out 0.3s backwards;
}

.info-item {
    flex: 1;
    text-align: center;
    padding: 0 16px;
}

.info-label {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-accent-light);
}

.info-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.15);
}

.hero-actions {
    display: flex;
    gap: 16px;
    animation: fadeInUp 0.6s ease-out 0.4s backwards;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition-bounce);
    cursor: pointer;
    white-space: nowrap;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.05rem;
    border-radius: var(--radius-lg);
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--color-white);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(52, 152, 219, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-3px);
}

/* ===== 截图展示 ===== */
.hero-showcase {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    animation: fadeInRight 0.8s ease-out 0.3s backwards;
}

.phone-frame {
    position: relative;
    width: 280px;
    height: 580px;
    background: var(--color-primary-dark);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 
        0 30px 80px rgba(0, 0, 0, 0.4),
        inset 0 2px 4px rgba(255, 255, 255, 0.1);
}

.phone-notch {
    position: absolute;
    top: 18px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 24px;
    background: var(--color-primary-dark);
    border-radius: 20px;
    z-index: 10;
}

.phone-screen {
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 32px;
    overflow: hidden;
    background: var(--color-bg-section);
}

.phone-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 32px;
    opacity: 0;
    transform: translateY(20px) scale(0.95);
    transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: none;
}

.phone-img::before {
    content: attr(data-placeholder);
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

.phone-img.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    z-index: 2;
}

.phone-img:not(.active) {
    opacity: 0;
    transform: translateY(-20px) scale(0.9);
    z-index: 1;
}

.showcase-indicators {
    display: flex;
    gap: 10px;
}

.indicator {
    width: 36px;
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
    cursor: pointer;
    transition: var(--transition);
}

.indicator.active {
    background: var(--color-accent);
    width: 48px;
}

.indicator:hover:not(.active) {
    background: rgba(255, 255, 255, 0.5);
}

/* 滚动提示 */
.scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8rem;
    animation: bounce 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 16px;
    height: 16px;
    border-right: 2px solid rgba(255, 255, 255, 0.5);
    border-bottom: 2px solid rgba(255, 255, 255, 0.5);
    transform: rotate(45deg);
}

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

/* ===== 通用区块标题 ===== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--color-accent-dark);
    margin-bottom: 12px;
    padding: 4px 12px;
    background: rgba(52, 152, 219, 0.1);
    border-radius: 100px;
}

.section-tag.light {
    color: var(--color-accent-light);
    background: rgba(93, 173, 226, 0.15);
}

.section-title {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--color-text-light);
    max-width: 560px;
    margin: 0 auto;
}

/* ===== 功能特色 ===== */
.features {
    padding: 100px 0;
    background: var(--color-bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(93, 173, 226, 0.3);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(93, 173, 226, 0.15) 0%, rgba(52, 152, 219, 0.1) 100%);
    border-radius: var(--radius-md);
    color: var(--color-accent-dark);
    margin-bottom: 20px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: var(--gradient-accent);
    color: var(--color-white);
    transform: scale(1.1) rotate(-3deg);
}

.feature-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 12px;
}

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

/* ===== 用户评价 ===== */
.reviews {
    padding: 100px 0;
    background: var(--color-white);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.review-card {
    background: var(--color-bg-light);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
}

.review-card::before {
    content: '"';
    position: absolute;
    top: 16px;
    right: 24px;
    font-size: 4rem;
    color: rgba(52, 152, 219, 0.08);
    font-family: Georgia, serif;
    line-height: 1;
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(93, 173, 226, 0.3);
}

.review-stars {
    color: #F39C12;
    font-size: 1rem;
    margin-bottom: 14px;
    letter-spacing: 2px;
}

.review-text {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}

.review-user {
    display: flex;
    align-items: center;
    gap: 14px;
}

.user-avatar {
    width: 48px;
    height: 48px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: 1.1rem;
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    color: var(--color-primary);
    font-size: 0.95rem;
}

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

/* ===== FAQ ===== */
.faq {
    padding: 100px 0;
    background: var(--color-bg-light);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-white);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active {
    border-color: var(--color-accent);
    box-shadow: 0 4px 20px rgba(93, 173, 226, 0.15);
}

.faq-question {
    width: 100%;
    padding: 24px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    text-align: left;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--color-accent-dark);
}

.faq-icon {
    width: 24px;
    height: 24px;
    position: relative;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background: var(--color-accent-dark);
    border-radius: 2px;
    transition: var(--transition);
}

.faq-icon::before {
    width: 16px;
    height: 2px;
    top: 50%;
    left: 4px;
    transform: translateY(-50%);
}

.faq-icon::after {
    width: 2px;
    height: 16px;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
}

.faq-item.active .faq-icon::after {
    transform: translateX(-50%) rotate(90deg);
    opacity: 0;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 28px 24px;
    color: var(--color-text-light);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* ===== 下载区域 ===== */
.download {
    position: relative;
    padding: 100px 0;
    background: var(--gradient-hero);
    overflow: hidden;
}

.download-bg {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 30% 50%, rgba(93, 173, 226, 0.2) 0%, transparent 60%),
        radial-gradient(circle at 70% 30%, rgba(133, 193, 233, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.download-container {
    position: relative;
    z-index: 2;
    text-align: center;
}

.download-content {
    color: var(--color-white);
}

.download-title {
    font-size: clamp(1.75rem, 3.5vw, 2.75rem);
    font-weight: 800;
    margin-bottom: 16px;
}

.download-desc {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 48px;
}

.download-cards {
    display: flex;
    justify-content: center;
    gap: 28px;
    flex-wrap: wrap;
    margin-bottom: 36px;
}

.download-card {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 32px 40px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(10px);
    min-width: 320px;
    text-align: left;
    transition: var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.download-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--color-accent);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.download-card:hover::before {
    left: 100%;
}

.download-card-android {
    border-color: rgba(93, 173, 226, 0.3);
}

.download-card-ios {
    border-color: rgba(133, 193, 233, 0.3);
}

.download-icon {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    color: var(--color-primary);
    flex-shrink: 0;
    transition: var(--transition);
}

.download-card:hover .download-icon {
    background: var(--gradient-accent);
    color: var(--color-white);
    transform: scale(1.05);
}

.download-info {
    flex: 1;
}

.download-platform {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 4px;
}

.download-version {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: 8px;
}

.download-action {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-accent-light);
    font-weight: 600;
    font-size: 0.9rem;
}

.download-hint {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--color-primary-dark);
    padding: 60px 0 30px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 48px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-logo {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid var(--color-accent);
    background: var(--color-white);
}

.footer-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-white);
}

.footer-tagline {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.footer-col h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-col a {
    display: block;
    padding: 6px 0;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

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

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

.footer-bottom p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
    margin: 4px 0;
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--gradient-accent);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(52, 152, 219, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition-bounce);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(52, 152, 219, 0.5);
}

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

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== 滚动动画触发 ===== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-container {
        gap: 40px;
    }
    
    .phone-frame {
        width: 240px;
        height: 500px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-120%);
        transition: transform 0.3s ease;
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .nav-link {
        width: 100%;
        padding: 14px 20px;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 50px;
    }
    
    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-info {
        flex-wrap: wrap;
        padding: 16px;
    }
    
    .info-item {
        padding: 8px 12px;
    }
    
    .info-divider {
        display: none;
    }
    
    .hero-actions {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .hero-showcase {
        order: -1;
    }
    
    .phone-frame {
        width: 220px;
        height: 460px;
    }
    
    .scroll-hint {
        display: none;
    }
    
    .features, .reviews, .faq, .download {
        padding: 70px 0;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .reviews-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .download-card {
        min-width: 100%;
        flex-direction: column;
        text-align: center;
        padding: 28px 24px;
    }
    
    .download-icon {
        width: 64px;
        height: 64px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-info {
        flex-direction: column;
        gap: 16px;
    }
    
    .info-item {
        padding: 4px 0;
    }
    
    .phone-frame {
        width: 200px;
        height: 420px;
    }
    
    .feature-card {
        padding: 28px;
    }
    
    .download-cards {
        gap: 20px;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
}

/* ===== 无障碍 ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== 暗色模式 ===== */
@media (prefers-color-scheme: dark) {
    /* 主要设计基于深色，无需额外调整 */
}

/* ===== 打印样式 ===== */
@media print {
    .navbar, .hero-showcase, .nav-toggle, .back-to-top {
        display: none !important;
    }
}