/* ============================================================
   美象家源 APP 官网 - 主样式表
   设计规范：现代简约风格，渐变色彩，响应式布局
   ============================================================ */

/* ========== CSS 变量 ========== */
:root {
    --color-primary: #059669;
    --color-primary-dark: #047857;
    --color-primary-light: #6ee7b7;
    --color-accent: #d97706;
    --color-accent-light: #fde68a;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-dark: #0f172a;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-lighter: #94a3b8;
    --color-border: #e2e8f0;
    --color-white: #ffffff;
    --color-success: #10b981;
    --color-error: #ef4444;

    --font-family:
        -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
        'Hiragino Sans GB', 'Microsoft YaHei', 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;
    --font-size-6xl: 3.75rem;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md:
        0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg:
        0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-xl:
        0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    --container-max: 1200px;
    --header-height: 72px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    overflow-x: hidden;
}

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

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

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

ul,
ol {
    list-style: none;
}

/* ========== 通用布局 ========== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-tag {
    display: inline-block;
    padding: 0.375rem 1rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    background: rgba(5, 150, 105, 0.08);
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
    letter-spacing: 0.05em;
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.section-desc {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(
        135deg,
        var(--color-primary),
        var(--color-primary-dark)
    );
    color: var(--color-white);
    box-shadow: 0 4px 14px rgba(5, 150, 105, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(5, 150, 105, 0.45);
}

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

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.btn-dark {
    background: var(--color-bg-dark);
    color: var(--color-white);
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-md);
}

.btn-dark:hover {
    background: #1e293b;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-icon {
    flex-shrink: 0;
}

/* ========== 导航栏 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: var(--font-size-xl);
    color: var(--color-text);
}

.logo-icon {
    font-size: 1.75rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-light);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: rgba(5, 150, 105, 0.06);
}

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    z-index: 1200;
}

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

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

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

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

/* ========== Hero 主视觉区 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: var(--header-height);
    background: linear-gradient(180deg, #ecfdf5 0%, #ffffff 50%, #f0fdf4 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(
        circle,
        rgba(5, 150, 105, 0.08) 0%,
        transparent 70%
    );
    border-radius: 50%;
}

.hero-bg::after {
    content: '';
    position: absolute;
    bottom: -10%;
    left: -5%;
    width: 400px;
    height: 400px;
    background: radial-gradient(
        circle,
        rgba(16, 185, 129, 0.08) 0%,
        transparent 70%
    );
    border-radius: 50%;
}

.hero-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
    max-width: 560px;
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: 900;
    line-height: 1.1;
    color: var(--color-text);
    margin-bottom: 1.5rem;
}

.hero-title-highlight {
    display: block;
    background: linear-gradient(
        135deg,
        var(--color-primary),
        var(--color-accent)
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 2.5rem;
}

.hero-stat {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.hero-stat-unit {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
    margin-left: 2px;
}

.hero-stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: 0.25rem;
}

/* 手机模型 */
.hero-mockup {
    flex-shrink: 0;
}

.mockup-frame {
    width: 260px;
    height: 520px;
    background: var(--color-bg-dark);
    border-radius: 36px;
    padding: 10px;
    position: relative;
    box-shadow:
        0 30px 60px rgba(0, 0, 0, 0.15),
        0 0 0 4px rgba(0, 0, 0, 0.1);
    transform: perspective(800px) rotateY(-8deg) rotateX(5deg);
    transition: transform var(--transition);
}

.mockup-frame:hover {
    transform: perspective(800px) rotateY(-2deg) rotateX(2deg);
}

.mockup-notch {
    width: 100px;
    height: 24px;
    background: var(--color-bg-dark);
    border-radius: 0 0 16px 16px;
    margin: 0 auto 8px;
}

.mockup-screen {
    width: 100%;
    height: calc(100% - 32px);
    background: #ecfdf5;
    border-radius: 28px;
    overflow: hidden;
    padding: 12px;
}

.mockup-statusbar {
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    color: #1a1a2e;
    margin-bottom: 8px;
    font-weight: 600;
}

.mockup-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.mockup-app-icon {
    font-size: 2rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(
        135deg,
        var(--color-primary),
        var(--color-primary-dark)
    );
    border-radius: 12px;
}

.mockup-app-name {
    font-size: 11px;
    font-weight: 700;
    color: #1a1a2e;
}

.mockup-banner {
    width: 100%;
    height: 80px;
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    border-radius: 12px;
}

.mockup-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    width: 100%;
}

.mockup-grid-item {
    height: 60px;
    background: var(--color-white);
    border-radius: 10px;
}

/* 向下滚动提示 */
.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--font-size-xs);
    color: var(--color-text-lighter);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%,
    100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(6px);
    }
}

/* ========== 功能介绍 ========== */
.features {
    padding: 6rem 0;
    background: var(--color-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    transition: all var(--transition);
    cursor: default;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(
        135deg,
        rgba(5, 150, 105, 0.1),
        rgba(5, 150, 105, 0.05)
    );
    border-radius: var(--radius-lg);
    margin-bottom: 1.25rem;
    color: var(--color-primary);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

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

/* ========== 应用截图 ========== */
.screenshots {
    padding: 6rem 0;
    background: var(--color-bg-alt);
    overflow: hidden;
}

.screenshots-carousel {
    position: relative;
    overflow: hidden;
    margin: 0 -1rem;
}

.screenshots-track {
    display: flex;
    gap: 1.5rem;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 1rem;
}

.screenshot-item {
    flex: 0 0 auto;
    width: 260px;
}

.screenshot-card {
    text-align: center;
}

.screenshot-img {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 1rem;
    transition: transform var(--transition);
}

.screenshot-card:hover .screenshot-img {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.screenshot-placeholder {
    width: 100%;
    aspect-ratio: 9/16;
    background: linear-gradient(180deg, #ecfdf5, #f0fdf4);
    border-radius: var(--radius-xl);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem;
}

/* 截图模拟屏幕 */
.screenshot-sim-screen {
    width: 100%;
    height: 100%;
    background: var(--color-white);
    border-radius: 12px;
    padding: 6px 8px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.screenshot-sim-bar {
    font-size: 7px;
    text-align: center;
    color: #1a1a2e;
    margin-bottom: 4px;
    font-weight: 600;
}

.screenshot-sim-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

/* 截图模拟各页面元素 */
.sim-search {
    height: 20px;
    background: #f1f5f9;
    border-radius: 8px;
}

.sim-banner {
    height: 50px;
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    border-radius: 8px;
}

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

.sim-cat {
    height: 32px;
    background: #f8fafc;
    border-radius: 6px;
}

.sim-products {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
}

.sim-prod {
    height: 55px;
    background: #f8fafc;
    border-radius: 6px;
}

.sim-cate-header {
    height: 24px;
    background: #e2e8f0;
    border-radius: 6px;
}

.sim-cate-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sim-cate-item {
    height: 40px;
    background: #f8fafc;
    border-radius: 6px;
}

.sim-detail-img {
    height: 100px;
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    border-radius: 8px;
}

.sim-detail-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 4px;
}

.sim-detail-line {
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
}

.sim-detail-line.short {
    width: 60%;
}

.sim-detail-btn {
    height: 28px;
    background: var(--color-primary);
    border-radius: 8px;
    margin-top: auto;
    opacity: 0.7;
}

.sim-cart-header {
    height: 24px;
    background: #e2e8f0;
    border-radius: 6px;
}

.sim-cart-items {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sim-cart-item {
    height: 50px;
    background: #f8fafc;
    border-radius: 6px;
}

.sim-cart-total {
    height: 36px;
    background: #1e293b;
    border-radius: 8px;
    margin-top: auto;
    opacity: 0.8;
}

.sim-profile-header {
    height: 60px;
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    border-radius: 8px;
}

.sim-profile-menu {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 4px;
}

.sim-menu-item {
    height: 32px;
    background: #f8fafc;
    border-radius: 6px;
}

.screenshot-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
}

/* 轮播控制 */
.screenshots-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2.5rem;
}

.carousel-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}

.carousel-btn:hover {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.carousel-dots {
    display: flex;
    gap: 0.5rem;
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-border);
    transition: all var(--transition);
    cursor: pointer;
}

.carousel-dot.active {
    width: 28px;
    border-radius: 4px;
    background: var(--color-primary);
}

/* ========== 用户评价 ========== */
.reviews {
    padding: 6rem 0;
    background: var(--color-bg);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.review-card {
    background: var(--color-bg-alt);
    border-radius: var(--radius-xl);
    padding: 1.75rem;
    transition: all var(--transition);
    border: 1px solid transparent;
}

.review-card:hover {
    background: var(--color-white);
    border-color: var(--color-border);
    box-shadow: var(--shadow-lg);
}

.review-stars {
    font-size: var(--font-size-lg);
    color: var(--color-accent);
    letter-spacing: 2px;
    margin-bottom: 1rem;
}

.review-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    min-height: 80px;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.review-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-weight: 700;
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

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

.review-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
}

.review-role {
    font-size: var(--font-size-xs);
    color: var(--color-text-lighter);
}

/* ========== 数据亮点 ========== */
.highlights {
    padding: 5rem 0;
    background: linear-gradient(
        135deg,
        var(--color-primary),
        var(--color-primary-dark)
    );
    color: var(--color-white);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.highlight-item {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.highlight-icon {
    margin-bottom: 1rem;
    opacity: 0.9;
    color: rgba(255, 255, 255, 0.8);
}

.highlight-number {
    font-size: var(--font-size-5xl);
    font-weight: 900;
    line-height: 1;
}

.highlight-unit {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-top: 0.25rem;
}

.highlight-label {
    font-size: var(--font-size-sm);
    opacity: 0.8;
    margin-top: 0.5rem;
}

/* ========== 下载区域 ========== */
.download {
    padding: 6rem 0;
    background: var(--color-bg-alt);
}

.download-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.download-card {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    padding: 2.5rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.download-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.download-card-icon {
    color: var(--color-primary);
    margin-bottom: 1.25rem;
}

.download-card-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.download-card-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: 0.25rem;
}

.download-card-version {
    font-size: var(--font-size-xs);
    color: var(--color-text-lighter);
    margin-bottom: 0.25rem;
}

.download-card-req {
    font-size: var(--font-size-xs);
    color: var(--color-text-lighter);
    margin-bottom: 1.5rem;
}

.download-qrcode {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.qrcode-placeholder {
    width: 120px;
    height: 120px;
    background: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 10px;
}

.qrcode-placeholder svg {
    width: 100%;
    height: 100%;
}

.download-qrcode span {
    font-size: var(--font-size-xs);
    color: var(--color-text-lighter);
}

/* ========== 页脚 ========== */
.footer {
    background: var(--color-bg-dark);
    color: var(--color-white);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.footer-logo-icon {
    font-size: 1.5rem;
}

.footer-logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: #94a3b8;
    line-height: 1.8;
    margin-bottom: 1.25rem;
}

.footer-social {
    display: flex;
    gap: 0.75rem;
}

.social-link {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    transition: all var(--transition);
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
    transform: translateY(-2px);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: #94a3b8;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--color-white);
}

.footer-links p {
    font-size: var(--font-size-sm);
    color: #94a3b8;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: var(--font-size-xs);
    color: #64748b;
}

/* ========== 回到顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
}

/* ========== 淡入动画 ========== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition:
        opacity 0.6s ease-out,
        transform 0.6s ease-out;
}

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

/* ============================================================
   响应式布局
   ============================================================ */

/* 平板 (≤1024px) */
@media (max-width: 1024px) {
    .hero-inner {
        flex-direction: column;
        text-align: center;
        padding: 2rem 0;
    }

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

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

    .hero-stat {
        align-items: center;
    }

    .hero-mockup {
        display: none;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
    }

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

    .footer-brand {
        grid-column: 1 / -1;
    }
}

/* 手机 (≤768px) */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 1.75rem;
        --font-size-5xl: 2rem;
        --font-size-6xl: 2.25rem;
    }

    .section-header {
        margin-bottom: 2.5rem;
    }

    /* 导航 - 移动端全屏菜单 */
    .nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 1100;
        background: #ffffff;
        flex-direction: column;
        justify-content: center;
        gap: 1rem;
        opacity: 0;
        visibility: hidden;
        transition:
            opacity 0.3s ease,
            visibility 0.3s ease;
    }

    .nav.open {
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        font-size: var(--font-size-lg);
        padding: 0.75rem 2rem;
    }

    .nav-toggle {
        display: flex;
    }

    /* Hero */
    .hero {
        min-height: auto;
        padding: 6rem 0 4rem;
    }

    .hero-title {
        font-size: var(--font-size-5xl);
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

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

    .hero-stats {
        gap: 1.5rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero-scroll {
        display: none;
    }

    /* 功能 */
    .features {
        padding: 4rem 0;
    }

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

    /* 截图轮播 */
    .screenshots {
        padding: 4rem 0;
    }

    .screenshot-item {
        width: 220px;
    }

    /* 评价 */
    .reviews {
        padding: 4rem 0;
    }

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

    /* 数据亮点 */
    .highlights {
        padding: 3rem 0;
    }

    .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }

    .highlight-number {
        font-size: var(--font-size-4xl);
    }

    /* 下载 */
    .download {
        padding: 4rem 0;
    }

    .download-cards {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    /* 页脚 */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-bottom {
        text-align: center;
    }

    .back-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
    }
}

/* 小手机 (≤480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero-stats {
        gap: 1rem;
    }

    .hero-stat-number {
        font-size: var(--font-size-2xl);
    }

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

    .screenshot-item {
        width: 180px;
    }
}