/* ===============================================
   筑梦岛官方网站 - 样式表
   配色方案：深紫蓝渐变（取自App Logo）
   =============================================== */

/* ---- CSS 变量 ---- */
:root {
    /* 主色系 - 取自筑梦岛Logo */
    --primary: #5B4FD8;
    --primary-dark: #3D2FB8;
    --primary-light: #8B7FFF;
    --secondary: #A89BFF;
    --accent: #6C5CE7;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #3D2FB8 0%, #6C5CE7 50%, #A89BFF 100%);
    --gradient-hero: linear-gradient(160deg, #2A1B6B 0%, #4A3FC8 35%, #6C5CE7 65%, #9B7BFF 100%);
    --gradient-btn: linear-gradient(135deg, #6C5CE7 0%, #8B7FFF 100%);
    --gradient-glow: radial-gradient(circle at 30% 20%, rgba(139, 127, 255, 0.4), transparent 60%);

    /* 中性色 */
    --text-primary: #1a1a2e;
    --text-secondary: #585878;
    --text-muted: #8e8ea0;
    --text-white: #ffffff;
    --bg-white: #ffffff;
    --bg-light: #f8f9fc;
    --bg-card: #ffffff;
    --border-light: #e8e8f0;
    --border-medium: #d0d0dc;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(59, 47, 184, 0.06);
    --shadow-md: 0 8px 30px rgba(59, 47, 184, 0.1);
    --shadow-lg: 0 20px 60px rgba(59, 47, 184, 0.15);
    --shadow-glow: 0 10px 40px rgba(108, 92, 231, 0.35);

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 30px;

    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scroll-padding-top: 80px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
                 "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-primary);
    background: var(--bg-white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- 通用组件 ---- */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--primary);
    padding: 6px 16px;
    background: rgba(108, 92, 231, 0.1);
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

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

/* ---- 按钮 ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    white-space: nowrap;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--gradient-btn);
    color: var(--text-white);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 45px rgba(108, 92, 231, 0.5);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1rem;
}

.btn-xl {
    padding: 18px 44px;
    font-size: 1.15rem;
}

.btn-download {
    background: var(--gradient-btn);
    color: var(--text-white);
    box-shadow: var(--shadow-glow);
    position: relative;
    overflow: hidden;
}

.btn-download::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
    transition: left 0.6s;
}

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

.btn-download:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 20px 55px rgba(108, 92, 231, 0.5);
}

/* ---- 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(232, 232, 240, 0.5);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--primary);
}

.logo-img {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: var(--gradient-hero);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3);
}

.logo-img[src=""], .logo-img:not([src]) {
    visibility: hidden;
}

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

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

.nav-link {
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background: rgba(108, 92, 231, 0.08);
}

.nav-download-btn {
    background: var(--gradient-btn);
    color: var(--text-white) !important;
    padding: 10px 22px !important;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.35);
}

.nav-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 92, 231, 0.5);
    background: var(--gradient-btn) !important;
    color: var(--text-white) !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 32px;
    height: 32px;
    padding: 6px 4px;
}

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

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ---- Hero 区 ---- */
.hero {
    position: relative;
    min-height: 100vh;
    background: var(--gradient-hero);
    color: var(--text-white);
    overflow: visible;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(139, 127, 255, 0.35), transparent 55%),
        radial-gradient(ellipse at 80% 80%, rgba(108, 92, 231, 0.4), transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(59, 47, 184, 0.2), transparent 70%);
    pointer-events: none;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.6;
}

.hero-container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    max-width: 560px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
    animation: fadeInUp 0.6s ease-out;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #4ade80;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 24px;
    animation: fadeInUp 0.7s ease-out 0.1s backwards;
}

.hero-title .gradient-text {
    background: linear-gradient(135deg, #ffffff 0%, #e0d9ff 50%, #c4b5fd 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.1rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 32px;
    animation: fadeInUp 0.7s ease-out 0.2s backwards;
}

.hero-meta {
    display: inline-flex;
    align-items: center;
    gap: 16px;
    padding: 16px 28px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
    animation: fadeInUp 0.7s ease-out 0.3s backwards;
}

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

.meta-label {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 500;
}

.meta-value {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-white);
    letter-spacing: 0.5px;
}

.meta-divider {
    width: 1px;
    height: 36px;
    background: rgba(255, 255, 255, 0.2);
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    animation: fadeInUp 0.7s ease-out 0.4s backwards;
}

.hero-stats {
    display: flex;
    gap: 40px;
    animation: fadeInUp 0.7s ease-out 0.5s backwards;
}

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

.stat-num {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-white);
}

.stat-label {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
}

/* ---- Hero 截图展示 ---- */
.hero-showcase {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    perspective: 1200px;
}

.showcase-stage {
    position: relative;
    width: 280px;
    height: 560px;
    overflow: visible;
}

.phone-frame {
    position: absolute;
    top: 0;
    left: 50%;
    transform-origin: center center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 0.6s ease;
    width: 280px;
    height: 560px;
    border-radius: 40px;
    overflow: hidden;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.4),
                0 0 0 3px rgba(255, 255, 255, 0.1);
    background: linear-gradient(180deg, #1a1a2e 0%, #16162a 100%);
}

.phone-frame.active {
    z-index: 10;
    transform: translateX(-50%) scale(1);
    opacity: 1;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5),
                0 0 0 3px rgba(255, 255, 255, 0.15),
                0 0 60px rgba(139, 127, 255, 0.3);
}

.phone-1 {
    transform: translateX(-50%) scale(0.85) translateX(-150px);
    opacity: 0.7;
    z-index: 3;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.phone-2 {
    transform: translateX(-50%) scale(0.85) translateX(150px);
    opacity: 0.7;
    z-index: 3;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.phone-3 {
    transform: translateX(-50%) scale(0.7) translateX(-280px);
    opacity: 0;
    z-index: 1;
    pointer-events: none;
}

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

.phone-img[src=""], .phone-img:not([src]) {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #2a1b6b, #4a3fc8);
    display: flex;
}

.phone-img[src=""]::after, .phone-img:not([src])::after {
    content: attr(alt);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
    padding: 20px;
    text-align: center;
}

.showcase-dots {
    display: flex;
    gap: 10px;
    margin-top: 30px;
    z-index: 10;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--text-white);
    width: 28px;
    border-radius: 5px;
}

.dot:hover {
    background: rgba(255, 255, 255, 0.6);
}

/* ---- 滚动提示 ---- */
.scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 26px;
    height: 42px;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-radius: 14px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
    z-index: 10;
}

.scroll-hint span {
    width: 4px;
    height: 8px;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 2px;
    animation: scrollDown 1.8s infinite;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 28px;
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: var(--transition-slow);
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-btn);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(108, 92, 231, 0.2);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    transition: var(--transition);
}

.feature-icon svg {
    width: 34px;
    height: 34px;
    color: var(--primary);
}

.icon-1 { background: rgba(108, 92, 231, 0.1); }
.icon-2 { background: rgba(139, 127, 255, 0.12); }
.icon-3 { background: rgba(90, 82, 200, 0.1); }
.icon-4 { background: rgba(168, 155, 255, 0.12); }
.icon-5 { background: rgba(108, 92, 231, 0.08); }
.icon-6 { background: rgba(139, 127, 255, 0.1); }

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(-5deg);
}

.feature-card:hover .feature-icon svg {
    color: var(--accent);
}

.feature-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

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

/* ---- 截图展示详情 ---- */
.showcase-section {
    padding: 100px 0;
    background: var(--bg-white);
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.screenshot-card {
    cursor: pointer;
    transition: var(--transition-slow);
    position: relative;
}

.screenshot-frame {
    width: 100%;
    aspect-ratio: 9/18;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: linear-gradient(180deg, #1a1a2e 0%, #16162a 100%);
    box-shadow: var(--shadow-md);
    transition: var(--transition-slow);
    position: relative;
}

.screenshot-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.screenshot-img[src=""], .screenshot-img:not([src]) {
    background: linear-gradient(135deg, #2a1b6b 0%, #4a3fc8 50%, #6c5ce7 100%);
}

.screenshot-img[src=""]::after, .screenshot-img:not([src])::after {
    content: attr(alt);
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.95rem;
    padding: 20px;
    text-align: center;
}

.screenshot-card:hover .screenshot-frame {
    box-shadow: var(--shadow-lg), 0 0 50px rgba(108, 92, 231, 0.3);
    transform: translateY(-10px);
}

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

.screenshot-caption {
    margin-top: 20px;
    text-align: center;
}

.screenshot-caption h4 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.screenshot-caption p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 28px;
}

.review-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-slow);
    position: relative;
    border: 1px solid var(--border-light);
}

.review-card::before {
    content: '\201C';
    position: absolute;
    top: -10px;
    left: 24px;
    font-size: 80px;
    color: var(--primary);
    opacity: 0.15;
    font-family: Georgia, serif;
    line-height: 1;
}

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

.review-stars {
    font-size: 1.1rem;
    color: #f59e0b;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.review-content {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
    font-style: italic;
}

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

.author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    flex-shrink: 0;
}

.avatar-1 { background: linear-gradient(135deg, #8B7FFF, #A89BFF); }
.avatar-2 { background: linear-gradient(135deg, #6C5CE7, #8B7FFF); }
.avatar-3 { background: linear-gradient(135deg, #5B4FD8, #6C5CE7); }

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

.author-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.author-tag {
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 500;
}

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

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

.faq-item {
    border-bottom: 1px solid var(--border-light);
}

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

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    gap: 16px;
}

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

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

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

.faq-icon::before {
    width: 14px;
    height: 2px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.faq-icon::after {
    width: 2px;
    height: 14px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.faq-question[aria-expanded="true"] .faq-icon::after {
    transform: translate(-50%, -50%) rotate(90deg);
    opacity: 0;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-answer p {
    padding-bottom: 24px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ---- 下载区 ---- */
.download-section {
    position: relative;
    padding: 120px 0;
    background: var(--gradient-hero);
    color: var(--text-white);
    overflow: hidden;
}

.download-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 30%, rgba(139, 127, 255, 0.3), transparent 55%),
        radial-gradient(ellipse at 70% 70%, rgba(168, 155, 255, 0.25), transparent 50%);
    pointer-events: none;
}

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

.download-content {
    max-width: 700px;
    margin: 0 auto;
}

.download-title {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.download-desc {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 40px;
}

.download-meta {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    margin-bottom: 48px;
    padding: 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);
}

.download-meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.dm-label {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
}

.dm-value {
    font-size: 1.1rem;
    font-weight: 700;
}

.download-tip {
    margin-top: 24px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.55);
}

/* ---- 页脚 ---- */
.footer {
    background: #141428;
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 0;
}

.footer-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    padding-bottom: 40px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.footer-logo {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gradient-hero);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3);
}

.footer-brand-info h4 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 2px;
}

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

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.footer-col h5 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.55);
    margin-bottom: 10px;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--primary-light);
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 24px 0;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.35);
}

/* ---- 悬浮下载按钮 ---- */
.floating-download {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 14px 22px;
    background: var(--gradient-btn);
    color: var(--text-white);
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: 0 10px 35px rgba(108, 92, 231, 0.5);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.floating-download.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.floating-download:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 45px rgba(108, 92, 231, 0.6);
}

.floating-download svg {
    width: 18px;
    height: 18px;
}

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.4;
    }
}

@keyframes scrollDown {
    0% {
        transform: translateY(0);
        opacity: 1;
    }
    100% {
        transform: translateY(12px);
        opacity: 0;
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 50px;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-meta,
    .hero-actions {
        justify-content: center;
    }

    .hero-showcase {
        order: -1;
    }

    .showcase-stage {
        width: 250px;
        height: 480px;
    }

    .phone-frame {
        width: 250px;
        height: 480px;
    }

    .phone-1 {
        transform: translateX(-50%) scale(0.8) translateX(-130px);
    }

    .phone-2 {
        transform: translateX(-50%) scale(0.8) translateX(130px);
    }

    .phone-3 {
        transform: translateX(-50%) scale(0.65) translateX(-240px);
    }

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

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        box-shadow: var(--shadow-md);
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        border-bottom: 1px solid var(--border-light);
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .nav-link {
        width: 100%;
        text-align: left;
        padding: 12px 18px;
        border-radius: 10px;
    }

    .nav-download-btn {
        text-align: center;
        margin-top: 8px;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-meta {
        flex-direction: column;
        gap: 12px;
        padding: 20px;
    }

    .meta-divider {
        width: 40px;
        height: 1px;
    }

    .hero-meta .meta-item {
        flex-direction: row;
        align-items: center;
        gap: 10px;
    }

    .hero-meta .meta-item .meta-label {
        font-size: 0.8rem;
    }

    .hero-meta .meta-item .meta-value {
        font-size: 1.05rem;
    }

    .hero-actions {
        flex-direction: column;
        gap: 12px;
    }

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

    .hero-stats {
        gap: 24px;
        flex-wrap: wrap;
    }

    .stat-num {
        font-size: 1.4rem;
    }

    .showcase-stage {
        width: 220px;
        height: 420px;
    }

    .phone-frame {
        width: 220px;
        height: 420px;
    }

    .phone-1 {
        transform: translateX(-50%) scale(0.72) translateX(-110px);
    }

    .phone-2 {
        transform: translateX(-50%) scale(0.72) translateX(110px);
    }

    .phone-3 {
        display: none;
    }

    .features,
    .showcase-section,
    .reviews,
    .faq {
        padding: 70px 0;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .feature-card {
        padding: 28px 24px;
    }

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

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

    .download-section {
        padding: 80px 0;
    }

    .download-meta {
        gap: 24px;
        padding: 20px;
    }

    .download-meta-item {
        min-width: 100px;
    }

    .footer {
        padding: 40px 0 0;
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .floating-download {
        bottom: 20px;
        right: 20px;
        padding: 12px 18px;
        font-size: 0.85rem;
    }

    .floating-download span {
        display: none;
    }

    .floating-download svg {
        width: 22px;
        height: 22px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.85rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .download-title {
        font-size: 1.5rem;
    }

    .download-meta {
        flex-direction: column;
        gap: 16px;
    }

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

    .stat-item {
        flex: 1 1 calc(50% - 12px);
    }
}