/* ==========================================================
   糟老头APP - 官方下载页面
   配色方案：紫橙配色（影音播放类APP风格）
   主色：#7B2FFD 紫色（代表娱乐、创意）
   辅色：#FF6B35 橙色（代表活力、热情）
   强调色：#FF3D71 粉红
   ========================================================== */

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

:root {
    --primary: #7B2FFD;
    --primary-light: #A855F7;
    --primary-dark: #5B21B6;
    --secondary: #FF6B35;
    --secondary-light: #FF8A5C;
    --accent: #FF3D71;
    --dark: #0F0B1D;
    --dark-2: #1A1535;
    --dark-3: #251E47;
    --gray-50: #F8F7FC;
    --gray-100: #F0EEF9;
    --gray-200: #E0DDF0;
    --gray-300: #C4C0DB;
    --gray-500: #7A7599;
    --gray-700: #45406B;
    --gray-900: #1E1A3D;
    --white: #FFFFFF;
    --gradient-primary: linear-gradient(135deg, #7B2FFD 0%, #FF3D71 100%);
    --gradient-secondary: linear-gradient(135deg, #FF6B35 0%, #FF3D71 100%);
    --gradient-dark: linear-gradient(135deg, #1A1535 0%, #251E47 100%);
    --shadow-sm: 0 2px 8px rgba(123, 47, 253, 0.1);
    --shadow-md: 0 8px 24px rgba(123, 47, 253, 0.15);
    --shadow-lg: 0 16px 48px rgba(123, 47, 253, 0.2);
    --shadow-glow: 0 0 40px rgba(123, 47, 253, 0.4);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
    background: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

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

/* 通用容器 */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============ 顶部导航 ============ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(123, 47, 253, 0.08);
    transition: all 0.3s ease;
}

.header.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: var(--gradient-primary);
    box-shadow: var(--shadow-sm);
}

.logo-text {
    font-size: 22px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-menu ul {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-menu a {
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-700);
    position: relative;
}

.nav-menu a:not(.nav-download-btn):hover {
    color: var(--primary);
}

.nav-menu a:not(.nav-download-btn)::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.nav-menu a:not(.nav-download-btn):hover::after {
    width: 100%;
}

.nav-download-btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 22px;
    background: var(--gradient-primary);
    color: var(--white) !important;
    border-radius: 50px;
    font-weight: 600 !important;
    box-shadow: 0 4px 14px rgba(123, 47, 253, 0.35);
    transition: all 0.3s ease;
}

.nav-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(123, 47, 253, 0.45);
}

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

.menu-toggle span {
    display: block;
    width: 26px;
    height: 3px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ============ Hero 首屏 ============ */
.hero {
    position: relative;
    padding-top: 72px;
    background: var(--gradient-dark);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 600px 400px at 10% 20%, rgba(123, 47, 253, 0.35), transparent 60%),
        radial-gradient(ellipse 500px 500px at 90% 80%, rgba(255, 61, 113, 0.3), transparent 60%),
        radial-gradient(ellipse 400px 300px at 50% 50%, rgba(255, 107, 53, 0.15), transparent 70%);
}

.hero-container {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 24px 100px;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50px;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

.badge-icon {
    width: 20px;
    height: 20px;
    border-radius: 6px;
    background: var(--gradient-secondary);
}

.hero-badge span {
    color: rgba(255, 255, 255, 0.9);
    font-size: 14px;
    font-weight: 500;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    color: var(--white);
    line-height: 1.1;
    margin-bottom: 16px;
    letter-spacing: -2px;
}

.title-highlight {
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 24px;
    font-weight: 600;
    color: var(--secondary-light);
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 560px;
}

/* 版本信息 */
.version-info {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px 28px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    margin-bottom: 36px;
    max-width: 540px;
}

.version-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.version-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    font-weight: 500;
}

.version-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
}

.divider {
    width: 1px;
    height: 36px;
    background: rgba(255, 255, 255, 0.15);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 8px 24px rgba(123, 47, 253, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(123, 47, 253, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--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, 0.6);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 36px;
    font-size: 17px;
}

.btn-xlarge {
    padding: 22px 56px;
    font-size: 20px;
    border-radius: 60px;
}

.btn-glow {
    animation: glowPulse 2s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { box-shadow: 0 8px 24px rgba(123, 47, 253, 0.4); }
    50% { box-shadow: 0 8px 40px rgba(255, 61, 113, 0.6); }
}

/* ============ 截图展示 ============ */
.screenshot-section {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.screenshot-stack {
    position: relative;
    width: 320px;
    height: 640px;
}

.screenshot-card {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 40px;
    overflow: hidden;
    background: var(--dark-3);
    border: 4px solid rgba(255, 255, 255, 0.15);
    box-shadow: 
        0 30px 60px rgba(0, 0, 0, 0.4),
        0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.screenshot-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: linear-gradient(135deg, var(--dark-2), var(--dark-3));
}

.screenshot-card::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 28px;
    background: var(--dark);
    border-radius: 20px;
    z-index: 5;
}

.screenshot-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 40px 24px 24px;
    background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
    color: var(--white);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.screenshot-overlay span {
    font-size: 18px;
    font-weight: 600;
}

/* 截图堆叠效果 */
.screenshot-card[data-index="0"] {
    z-index: 3;
    transform: rotate(-6deg) translateX(-30px) scale(0.9);
    opacity: 0.6;
}

.screenshot-card[data-index="1"] {
    z-index: 2;
    transform: translateY(-10px) scale(0.95);
    opacity: 0.8;
}

.screenshot-card[data-index="2"] {
    z-index: 4;
    transform: rotate(6deg) translateX(30px) scale(0.88);
    opacity: 0.5;
}

/* 激活状态 */
.screenshot-card.active {
    z-index: 10 !important;
    transform: rotate(0deg) translateX(0) scale(1) !important;
    opacity: 1 !important;
    box-shadow: 
        0 40px 80px rgba(0, 0, 0, 0.5),
        0 0 60px rgba(123, 47, 253, 0.3);
}

.screenshot-card.active .screenshot-overlay {
    opacity: 1;
}

/* 缩略图控制 */
.screenshot-controls {
    display: flex;
    gap: 16px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 20px;
    backdrop-filter: blur(10px);
}

.screenshot-thumb {
    width: 64px;
    height: 88px;
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    border: 3px solid transparent;
    transition: all 0.3s ease;
    background: var(--dark-3);
}

.screenshot-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: linear-gradient(135deg, var(--dark-2), var(--dark-3));
}

.screenshot-thumb.active {
    border-color: var(--secondary);
    transform: scale(1.1);
    box-shadow: 0 4px 16px rgba(255, 107, 53, 0.4);
}

.screenshot-thumb:hover {
    border-color: rgba(255, 107, 53, 0.6);
}

/* ============ 首屏底部下载条 ============ */
.hero-download-strip {
    position: relative;
    z-index: 2;
    background: var(--gray-50);
    border-top-left-radius: 40px;
    border-top-right-radius: 40px;
    margin-top: -30px;
    padding: 4px 0 0;
}

.download-strip-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.download-strip-info {
    display: flex;
    align-items: center;
    gap: 20px;
}

.download-strip-logo img {
    width: 64px;
    height: 64px;
    border-radius: 18px;
    background: var(--gradient-primary);
    box-shadow: var(--shadow-md);
}

.download-strip-text h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.download-strip-text p {
    font-size: 14px;
    color: var(--gray-500);
}

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

.section-tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(123, 47, 253, 0.1);
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 12px;
    letter-spacing: -1px;
}

.section-title.left {
    text-align: left;
}

.section-subtitle {
    font-size: 16px;
    color: var(--gray-500);
}

/* ============ 功能亮点 ============ */
.features {
    padding: 100px 0;
    background: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.feature-card {
    padding: 40px 28px;
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

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

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.feature-icon {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--white);
}

.icon-orange { background: linear-gradient(135deg, #FF6B35, #FF3D71); }
.icon-green { background: linear-gradient(135deg, #10B981, #059669); }
.icon-purple { background: linear-gradient(135deg, #8B5CF6, #7B2FFD); }
.icon-blue { background: linear-gradient(135deg, #3B82F6, #2563EB); }

.feature-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
}

/* ============ 软件特色 ============ */
.highlights {
    padding: 100px 0;
    background: var(--white);
}

.highlights-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.highlights-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-top: 40px;
}

.highlight-item {
    display: flex;
    gap: 24px;
    padding: 24px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.highlight-item:hover {
    background: var(--white);
    box-shadow: var(--shadow-md);
    transform: translateX(8px);
}

.highlight-num {
    font-size: 36px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    flex-shrink: 0;
}

.highlight-text h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.highlight-text p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
}

/* 特色展示视觉区 */
.highlights-visual {
    position: relative;
    height: 520px;
}

.visual-card {
    position: absolute;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.visual-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary-dark), var(--accent));
}

.visual-main {
    width: 280px;
    height: 440px;
    top: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
}

.visual-sub-1 {
    width: 180px;
    height: 280px;
    top: 0;
    left: 0;
    z-index: 2;
    transform: rotate(-8deg);
}

.visual-sub-2 {
    width: 180px;
    height: 280px;
    bottom: 0;
    right: 0;
    z-index: 2;
    transform: rotate(8deg);
}

.visual-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 8px 16px;
    background: var(--gradient-secondary);
    color: var(--white);
    font-size: 13px;
    font-weight: 700;
    border-radius: 50px;
    z-index: 5;
}

.visual-tag-mini {
    position: absolute;
    bottom: 12px;
    right: 12px;
    padding: 6px 12px;
    background: rgba(15, 11, 29, 0.85);
    color: var(--white);
    font-size: 11px;
    font-weight: 600;
    border-radius: 50px;
    backdrop-filter: blur(10px);
    z-index: 5;
}

/* ============ 平台优势 ============ */
.advantages {
    padding: 100px 0;
    background: var(--gradient-dark);
    position: relative;
    overflow: hidden;
}

.advantages::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 500px 300px at 20% 30%, rgba(255, 107, 53, 0.2), transparent 60%),
        radial-gradient(ellipse 400px 400px at 80% 70%, rgba(123, 47, 253, 0.25), transparent 60%);
}

.advantages .section-container {
    position: relative;
    z-index: 2;
}

.advantages .section-title {
    color: var(--white);
}

.advantages .section-subtitle {
    color: rgba(255, 255, 255, 0.7);
}

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

.advantage-card {
    padding: 36px 32px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
}

.advantage-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.advantage-visual {
    margin-bottom: 24px;
}

.advantage-icon-bg {
    width: 68px;
    height: 68px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.icon-bg-red { background: linear-gradient(135deg, #EF4444, #FF3D71); }
.icon-bg-orange { background: linear-gradient(135deg, #F59E0B, #FF6B35); }
.icon-bg-purple { background: linear-gradient(135deg, #8B5CF6, #7B2FFD); }

.advantage-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 12px;
}

.advantage-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

/* ============ 用户评价 ============ */
.reviews {
    padding: 100px 0;
    background: var(--gray-50);
}

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

.review-card {
    padding: 36px 32px;
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    transition: all 0.4s ease;
    position: relative;
}

.review-card::before {
    content: '"';
    position: absolute;
    top: 16px;
    right: 28px;
    font-size: 80px;
    color: var(--gray-100);
    font-family: Georgia, serif;
    line-height: 1;
    font-weight: 700;
}

.review-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.review-stars {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
}

.review-content {
    font-size: 15px;
    color: var(--gray-700);
    line-height: 1.8;
    margin-bottom: 28px;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 14px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-100);
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    flex-shrink: 0;
}

.author-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.author-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-900);
}

.author-tag {
    font-size: 12px;
    color: var(--primary);
    font-weight: 500;
}

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

.faq-container {
    max-width: 820px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 16px;
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
}

.faq-item.active {
    border-color: var(--primary);
    box-shadow: 0 8px 30px rgba(123, 47, 253, 0.12);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 22px 28px;
    cursor: pointer;
    background: var(--white);
    user-select: none;
    gap: 20px;
}

.faq-question span {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
}

.faq-icon {
    flex-shrink: 0;
    color: var(--primary);
    transition: transform 0.3s ease;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    background: var(--gray-50);
}

.faq-answer p {
    padding: 0 28px 0;
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.8;
}

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

.faq-item.active .faq-answer p {
    padding: 0 28px 24px;
}

/* ============ 大下载区 CTA ============ */
.cta-section {
    padding: 100px 0;
    background: var(--gray-50);
}

.cta-card {
    position: relative;
    padding: 80px 40px;
    background: var(--gradient-dark);
    border-radius: var(--radius-xl);
    overflow: hidden;
    text-align: center;
}

.cta-bg-decoration {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 500px 400px at 50% 0%, rgba(255, 61, 113, 0.3), transparent 60%),
        radial-gradient(ellipse 400px 300px at 20% 100%, rgba(255, 107, 53, 0.2), transparent 60%),
        radial-gradient(ellipse 400px 300px at 80% 100%, rgba(123, 47, 253, 0.25), transparent 60%);
}

.cta-content {
    position: relative;
    z-index: 2;
    max-width: 680px;
    margin: 0 auto;
}

.cta-logo {
    margin-bottom: 28px;
}

.cta-logo img {
    width: 96px;
    height: 96px;
    margin: 0 auto;
    border-radius: 28px;
    background: var(--gradient-primary);
    box-shadow: 
        0 20px 50px rgba(123, 47, 253, 0.4),
        0 0 0 6px rgba(255, 255, 255, 0.1);
}

.cta-title {
    font-size: 40px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.cta-subtitle {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.8;
    margin-bottom: 28px;
}

.cta-version-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}

.cta-version-badge,
.cta-date-badge,
.cta-size-badge {
    padding: 8px 18px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.85);
    font-size: 14px;
    font-weight: 500;
    border-radius: 50px;
    backdrop-filter: blur(10px);
}

.cta-divider {
    color: rgba(255, 255, 255, 0.3);
}

.cta-tips {
    margin-top: 20px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.55);
}

/* ============ 页脚 ============ */
.footer {
    background: var(--dark);
    padding: 60px 0 24px;
    color: var(--white);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo img {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--gradient-primary);
}

.footer-logo span {
    font-size: 20px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    line-height: 1.7;
    max-width: 280px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-col h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 18px;
}

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

.footer-col a,
.footer-col span {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    transition: color 0.3s ease;
}

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

.footer-bottom {
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.35);
}

/* ==========================================================
   响应式设计
   ========================================================== */

/* 大屏 PC (>= 1200px) */
@media (min-width: 1200px) {
    .hero-title { font-size: 68px; }
    .section-title { font-size: 46px; }
}

/* 普通 PC (< 1200px) */
@media (max-width: 1199px) {
    .hero-container {
        gap: 40px;
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .highlights-wrapper {
        gap: 50px;
    }
    .screenshot-stack {
        width: 280px;
        height: 560px;
    }
}

/* 平板 (< 992px) */
@media (max-width: 991px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 20px 24px 30px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        opacity: 0;
        visibility: hidden;
    }
    .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    .nav-menu ul {
        flex-direction: column;
        gap: 4px;
        align-items: stretch;
    }
    .nav-menu a {
        display: block;
        padding: 14px 16px;
        border-radius: 12px;
    }
    .nav-menu a:hover {
        background: var(--gray-50);
    }
    .nav-download-btn {
        text-align: center;
        margin-top: 12px;
    }
    .menu-toggle {
        display: flex;
    }
    .menu-toggle.open span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    .menu-toggle.open span:nth-child(2) {
        opacity: 0;
    }
    .menu-toggle.open span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 60px 24px 80px;
    }
    .hero-content {
        order: 1;
    }
    .screenshot-section {
        order: 2;
        margin-top: 20px;
    }
    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }
    .version-info {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-actions {
        justify-content: center;
    }
    .hero-title {
        font-size: 52px;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .advantages-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    .reviews-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    .highlights-wrapper {
        grid-template-columns: 1fr;
    }
    .section-title.left {
        text-align: center;
    }
    .highlights-visual {
        height: 460px;
        order: -1;
    }
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 手机 (< 768px) */
@media (max-width: 767px) {
    .nav-container {
        height: 64px;
    }
    .logo-text {
        font-size: 18px;
    }
    .logo-img {
        width: 36px;
        height: 36px;
    }
    .hero {
        padding-top: 64px;
    }
    .hero-container {
        padding: 48px 20px 60px;
    }
    .hero-title {
        font-size: 40px;
        letter-spacing: -1px;
    }
    .hero-subtitle {
        font-size: 18px;
    }
    .hero-desc {
        font-size: 15px;
    }
    .version-info {
        flex-direction: column;
        gap: 16px;
        padding: 20px;
    }
    .version-item {
        align-items: center;
    }
    .divider {
        width: 60px;
        height: 1px;
    }
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    .btn {
        width: 100%;
    }

    .screenshot-stack {
        width: 240px;
        height: 480px;
    }
    .screenshot-card[data-index="0"] {
        transform: rotate(-4deg) translateX(-20px) scale(0.9);
    }
    .screenshot-card[data-index="2"] {
        transform: rotate(4deg) translateX(20px) scale(0.88);
    }
    .screenshot-thumb {
        width: 54px;
        height: 74px;
    }

    .download-strip-container {
        flex-direction: column;
        padding: 20px 24px;
        text-align: center;
    }
    .download-strip-info {
        flex-direction: column;
    }
    .download-strip-container .btn {
        width: 100%;
    }

    .section-container {
        padding: 0 20px;
    }
    .features,
    .highlights,
    .advantages,
    .reviews,
    .faq,
    .cta-section {
        padding: 70px 0;
    }
    .section-header {
        margin-bottom: 40px;
    }
    .section-title {
        font-size: 30px;
    }
    .section-subtitle {
        font-size: 15px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .feature-card {
        padding: 32px 24px;
    }
    .highlight-item {
        flex-direction: column;
        gap: 8px;
        padding: 20px;
    }
    .highlight-item:hover {
        transform: translateY(-4px);
    }
    .highlights-visual {
        height: 400px;
    }
    .visual-main {
        width: 220px;
        height: 340px;
        top: 30px;
    }
    .visual-sub-1,
    .visual-sub-2 {
        width: 140px;
        height: 220px;
    }
    .advantages-grid,
    .reviews-grid {
        gap: 20px;
    }
    .advantage-card,
    .review-card {
        padding: 28px 24px;
    }
    .faq-question {
        padding: 18px 20px;
    }
    .faq-question span {
        font-size: 15px;
    }
    .faq-answer p {
        padding: 0 20px 0;
        font-size: 14px;
    }
    .faq-item.active .faq-answer p {
        padding: 0 20px 20px;
    }

    .cta-card {
        padding: 50px 24px;
    }
    .cta-logo img {
        width: 72px;
        height: 72px;
        border-radius: 20px;
    }
    .cta-title {
        font-size: 28px;
    }
    .cta-subtitle {
        font-size: 15px;
    }
    .btn-xlarge {
        padding: 18px 36px;
        font-size: 17px;
    }
    .cta-version-row {
        gap: 8px;
    }
    .cta-version-badge,
    .cta-date-badge,
    .cta-size-badge {
        padding: 6px 12px;
        font-size: 12px;
    }

    .footer {
        padding: 40px 0 20px;
    }
    .footer-content {
        gap: 30px;
    }
    .footer-links {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
    .footer-col:nth-child(3) {
        grid-column: 1 / -1;
    }
}

/* 小屏手机 (< 480px) */
@media (max-width: 479px) {
    .hero-title {
        font-size: 34px;
    }
    .screenshot-stack {
        width: 210px;
        height: 420px;
    }
    .section-title {
        font-size: 26px;
    }
    .cta-title {
        font-size: 24px;
    }
    .footer-links {
        grid-template-columns: 1fr;
    }
    .footer-col:nth-child(3) {
        grid-column: auto;
    }
}