/* ============================================
   NotebookLM101 - 新潮波普风 (Modern Pop Art)
   孟菲斯 + 报刊拼贴风格
   ============================================ */

/* ============================================
   CSS 变量 - 波普风配色
   ============================================ */
:root {
    /* 主色调 - 高饱和度 */
    --color-pop-yellow: #FFD93D;
    --color-pop-pink: #FF6B9D;
    --color-pop-blue: #4ECDC4;
    --color-pop-purple: #A855F7;
    --color-pop-red: #FF6B6B;
    --color-pop-orange: #FF8C42;
    --color-pop-green: #95E1D3;

    /* 中性色 */
    --color-black: #1a1a1a;
    --color-white: #ffffff;
    --color-cream: #FFF8E7;
    --color-gray: #6B7280;

    /* 波普风边框 */
    --border-thick: 4px solid var(--color-black);
    --border-thin: 2px solid var(--color-black);
    --border-dotted: 3px dotted var(--color-black);

    /* 波普风阴影 - 硬阴影，无模糊 */
    --shadow-hard: 6px 6px 0px var(--color-black);
    --shadow-hard-sm: 4px 4px 0px var(--color-black);
    --shadow-hard-lg: 10px 10px 0px var(--color-black);

    /* 字体 */
    --font-family-heading: 'Impact', 'Arial Black', sans-serif;
    --font-family-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'Courier New', monospace;

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* 圆角 */
    --radius-none: 0;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    /* 过渡 */
    --transition-fast: 0.1s ease;
    --transition-base: 0.2s ease;
}

/* ============================================
   基础重置
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family-body);
    line-height: 1.6;
    color: var(--color-black);
    background-color: var(--color-cream);
    background-image:
        radial-gradient(circle, var(--color-pop-yellow) 2px, transparent 2px),
        radial-gradient(circle, var(--color-pop-pink) 2px, transparent 2px);
    background-size: 60px 60px;
    background-position: 0 0, 30px 30px;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* ============================================
   通用组件
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 波普风标题 */
.section-title {
    font-family: var(--font-family-heading);
    font-size: clamp(2rem, 6vw, 3.5rem);
    text-transform: uppercase;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-black);
    text-shadow: 3px 3px 0px var(--color-pop-yellow);
    letter-spacing: 2px;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    right: 0;
    height: 6px;
    background: repeating-linear-gradient(
        90deg,
        var(--color-pop-pink) 0px,
        var(--color-pop-pink) 20px,
        var(--color-black) 20px,
        var(--color-black) 22px
    );
}

.section-title .emoji {
    font-size: 0.8em;
}

/* 波普方框卡片 */
.pop-box {
    background: var(--color-white);
    border: var(--border-thick);
    box-shadow: var(--shadow-hard);
    transition: all var(--transition-base);
}

.pop-box:hover {
    transform: translate(-3px, -3px);
    box-shadow: 9px 9px 0px var(--color-black);
}

/* 波普标签 */
.pop-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--color-pop-yellow);
    border: var(--border-thin);
    font-family: var(--font-family-mono);
    font-weight: bold;
    font-size: 0.875rem;
    text-transform: uppercase;
    box-shadow: var(--shadow-hard-sm);
}

/* ============================================
   进度条
   ============================================ */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 6px;
    background: repeating-linear-gradient(
        45deg,
        var(--color-pop-yellow),
        var(--color-pop-yellow) 10px,
        var(--color-pop-pink) 10px,
        var(--color-pop-pink) 20px,
        var(--color-pop-blue) 20px,
        var(--color-pop-blue) 30px
    );
    z-index: 1000;
    border-bottom: var(--border-thin);
    transition: width var(--transition-base);
}

/* ============================================
   目录导航按钮（FAB）- 所有设备显示
   ============================================ */
.fab {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 64px;
    height: 64px;
    background: var(--color-pop-pink);
    border: var(--border-thick);
    box-shadow: var(--shadow-hard);
    cursor: pointer;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.fab:hover {
    transform: translate(-3px, -3px);
    box-shadow: 9px 9px 0px var(--color-black);
    background: var(--color-pop-purple);
}

.fab:active {
    transform: translate(0, 0);
    box-shadow: var(--shadow-hard);
}

.fab-icon {
    font-size: 1.75rem;
    color: var(--color-black);
}

/* ============================================
   移动端导航抽屉
   ============================================ */
.mobile-drawer {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    height: 100%;
    background: var(--color-pop-yellow);
    border-right: var(--border-thick);
    z-index: 300;
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    background-image: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(0,0,0,0.05) 10px,
        rgba(0,0,0,0.05) 20px
    );
}

.mobile-drawer.open {
    transform: translateX(0);
}

.drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: var(--border-thick);
    font-family: var(--font-family-heading);
    font-size: 1.5rem;
    text-transform: uppercase;
    background: var(--color-pop-pink);
}

.drawer-close {
    background: var(--color-black);
    color: var(--color-white);
    border: none;
    font-size: 2rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-family-mono);
    font-weight: bold;
}

.drawer-nav {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.drawer-link {
    display: block;
    padding: var(--spacing-sm);
    background: var(--color-white);
    border: var(--border-thin);
    font-family: var(--font-family-heading);
    font-size: 1rem;
    text-transform: uppercase;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-hard-sm);
}

.drawer-link:hover {
    background: var(--color-pop-blue);
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0px var(--color-black);
}

.drawer-link.active {
    background: var(--color-black);
    color: var(--color-pop-yellow);
}

.drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 250;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    backdrop-filter: blur(2px);
}

.drawer-overlay.open {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   Hero 区 - 报刊头条风格
   ============================================ */
.hero {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    background: var(--color-pop-yellow);
    border-bottom: var(--border-thick);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: repeating-linear-gradient(
        90deg,
        transparent 0px,
        transparent 40px,
        rgba(0,0,0,0.03) 40px,
        rgba(0,0,0,0.03) 42px
    );
    pointer-events: none;
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-family: var(--font-family-heading);
    font-size: clamp(3rem, 10vw, 6rem);
    text-transform: uppercase;
    line-height: 0.9;
    margin-bottom: var(--spacing-md);
    color: var(--color-black);
    text-shadow:
        6px 6px 0px var(--color-pop-pink),
        -3px -3px 0px var(--color-pop-blue);
    letter-spacing: -2px;
    transform: rotate(-2deg);
}

.hero-subtitle {
    font-family: var(--font-family-mono);
    font-size: clamp(1rem, 3vw, 1.5rem);
    background: var(--color-black);
    color: var(--color-pop-yellow);
    padding: 0.5rem 1rem;
    display: inline-block;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 3px;
    transform: rotate(1deg);
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--color-black);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 500;
    line-height: 1.8;
}

/* 波普风按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border: var(--border-thick);
    font-family: var(--font-family-heading);
    font-size: 1.125rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-hard);
    white-space: nowrap;
}

.btn:hover {
    transform: translate(-3px, -3px);
    box-shadow: 9px 9px 0px var(--color-black);
}

.btn:active {
    transform: translate(0, 0);
    box-shadow: 3px 3px 0px var(--color-black);
}

.btn-primary {
    background: var(--color-pop-pink);
    color: var(--color-black);
}

.btn-secondary {
    background: var(--color-pop-blue);
    color: var(--color-black);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.375rem;
}

.btn-yellow {
    background: var(--color-pop-yellow);
    color: var(--color-black);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   快速入门 - 漫画对话气泡风格
   ============================================ */
.quick-start {
    padding: var(--spacing-lg) 0;
    background: var(--color-pop-blue);
    border-top: var(--border-thick);
    border-bottom: var(--border-thick);
}

.quick-start-box {
    background: var(--color-white);
    border: var(--border-thick);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-hard-lg);
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.quick-start-box::before {
    content: 'BREAKING!';
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-pop-red);
    color: var(--color-white);
    padding: 0.5rem 1.5rem;
    font-family: var(--font-family-heading);
    font-size: 1.25rem;
    border: var(--border-thin);
    box-shadow: var(--shadow-hard-sm);
    text-transform: uppercase;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: translateX(-50%) scale(1); }
    50% { transform: translateX(-50%) scale(1.05); }
}

.quick-start-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: var(--spacing-sm);
    animation: bounce 1s infinite;
}

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

.quick-start-title {
    font-family: var(--font-family-heading);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    color: var(--color-black);
}

.quick-start-text {
    font-size: 1.25rem;
    font-weight: 500;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ============================================
   核心功能 - 漫画格风格
   ============================================ */
.features {
    padding: var(--spacing-xl) 0;
    background: var(--color-pop-purple);
    border-top: var(--border-thick);
    border-bottom: var(--border-thick);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.feature-card {
    background: var(--color-white);
    border: var(--border-thick);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--shadow-hard);
    transition: all var(--transition-base);
    position: relative;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 8px;
    right: 8px;
    bottom: 8px;
    border: var(--border-dotted);
    pointer-events: none;
}

.feature-card:hover {
    transform: translate(-5px, -5px) rotate(-1deg);
    box-shadow: 11px 11px 0px var(--color-black);
}

.feature-card:nth-child(1):hover { background: var(--color-pop-yellow); }
.feature-card:nth-child(2):hover { background: var(--color-pop-pink); }
.feature-card:nth-child(3):hover { background: var(--color-pop-blue); }
.feature-card:nth-child(4):hover { background: var(--color-pop-green); }

.feature-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.feature-title {
    font-family: var(--font-family-heading);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
}

.feature-desc {
    font-size: 1rem;
    color: var(--color-black);
    line-height: 1.6;
}

.new-features {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-black);
    border: var(--border-thick);
    box-shadow: var(--shadow-hard);
}

.badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: var(--color-pop-red);
    color: var(--color-white);
    font-family: var(--font-family-heading);
    font-size: 1rem;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
    border: var(--border-thin);
    animation: blink 2s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.new-features p {
    color: var(--color-white);
    font-size: 1.125rem;
    font-weight: 500;
}

/* ============================================
   用户画像 - 报刊专栏风格
   ============================================ */
.users {
    padding: var(--spacing-xl) 0;
    background: var(--color-pop-orange);
    border-top: var(--border-thick);
    border-bottom: var(--border-thick);
}

.users-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.user-card {
    background: var(--color-white);
    border: var(--border-thick);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--shadow-hard);
    transition: all var(--transition-base);
}

.user-card:hover {
    transform: translateY(-5px) rotate(2deg);
    box-shadow: var(--shadow-hard-lg);
}

.user-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--spacing-sm);
    background: var(--color-pop-yellow);
    width: 80px;
    height: 80px;
    line-height: 80px;
    border-radius: 50%;
    margin-left: auto;
    margin-right: auto;
    border: var(--border-thin);
}

.user-title {
    font-family: var(--font-family-heading);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
}

.user-desc {
    font-size: 0.9375rem;
    line-height: 1.6;
    font-weight: 500;
}

/* ============================================
   谁不适合 - 警告风格
   ============================================ */
.not-suitable {
    padding: var(--spacing-lg) 0;
    background: var(--color-pop-red);
    border-top: var(--border-thick);
    border-bottom: var(--border-thick);
}

.not-suitable-list {
    max-width: 800px;
    margin: 0 auto;
}

.not-suitable-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: var(--color-white);
    border: var(--border-thick);
    box-shadow: var(--shadow-hard);
}

.cross-icon {
    color: var(--color-pop-red);
    font-size: 2rem;
    font-weight: bold;
    flex-shrink: 0;
    font-family: var(--font-family-heading);
}

/* ============================================
   用户评价 - 报纸报道风格
   ============================================ */
.reviews {
    padding: var(--spacing-xl) 0;
    background: var(--color-cream);
    border-top: var(--border-thick);
    border-bottom: var(--border-thick);
}

.review-section {
    margin-bottom: var(--spacing-lg);
}

.review-section-title {
    font-family: var(--font-family-heading);
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.review-list {
    display: grid;
    gap: var(--spacing-sm);
}

.review-item {
    background: var(--color-white);
    border: var(--border-thin);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-hard-sm);
    font-size: 1rem;
    line-height: 1.6;
}

.review-section.positive .review-item {
    border-left: 8px solid var(--color-pop-green);
}

.review-section.negative .review-item {
    border-left: 8px solid var(--color-pop-orange);
}

.review-quotes {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.quote {
    font-family: var(--font-family-mono);
    font-size: 1.25rem;
    font-weight: 600;
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-pop-yellow);
    border: var(--border-thick);
    box-shadow: var(--shadow-hard);
    position: relative;
}

.quote::before {
    content: '"';
    font-size: 4rem;
    position: absolute;
    top: -20px;
    left: 20px;
    opacity: 0.3;
    font-family: Georgia, serif;
}

/* ============================================
   FAQ 手风琴 - 报纸折叠风格
   ============================================ */
.faq {
    padding: var(--spacing-xl) 0;
    background: var(--color-pop-green);
    border-top: var(--border-thick);
    border-bottom: var(--border-thick);
}

.faq-accordion {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-white);
    border: var(--border-thick);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    box-shadow: var(--shadow-hard);
}

.faq-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    cursor: pointer;
    user-select: none;
    transition: background var(--transition-fast);
    background: var(--color-pop-yellow);
}

.faq-header:hover {
    background: var(--color-pop-blue);
}

.faq-icon {
    font-size: 1.75rem;
    flex-shrink: 0;
}

.faq-title {
    flex: 1;
    font-family: var(--font-family-heading);
    font-size: 1.125rem;
    text-transform: uppercase;
}

.faq-arrow {
    font-size: 1.5rem;
    transition: transform var(--transition-base);
}

.faq-item.expanded .faq-arrow {
    transform: rotate(180deg);
}

.faq-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    background: var(--color-white);
}

.faq-item.expanded .faq-content {
    max-height: 600px;
}

.faq-content p {
    padding: var(--spacing-md);
    font-size: 1rem;
    line-height: 1.7;
}

/* ============================================
   竞品对比 - 报纸表格风格
   ============================================ */
.compare {
    padding: var(--spacing-xl) 0;
    background: var(--color-pop-blue);
    border-top: var(--border-thick);
    border-bottom: var(--border-thick);
}

.compare-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.compare-card {
    background: var(--color-white);
    border: var(--border-thick);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-hard-lg);
}

.compare-title {
    font-family: var(--font-family-heading);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    text-align: center;
    background: var(--color-black);
    color: var(--color-pop-yellow);
    padding: var(--spacing-sm);
    border: var(--border-thin);
}

.compare-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.compare-item {
    padding: var(--spacing-sm);
    font-size: 1rem;
    font-family: var(--font-family-mono);
    border: var(--border-dotted);
}

.compare-item.positive {
    background: var(--color-pop-green);
}

.compare-item.negative {
    background: var(--color-pop-red);
}

.compare-summary {
    text-align: center;
    font-family: var(--font-family-heading);
    font-size: 1.25rem;
    text-transform: uppercase;
    padding: var(--spacing-sm);
    background: var(--color-pop-pink);
    border: var(--border-thin);
}

/* ============================================
   立即开始
   ============================================ */
.get-started {
    padding: var(--spacing-xl) 0;
    background: var(--color-pop-yellow);
    border-top: var(--border-thick);
    border-bottom: var(--border-thick);
}

.get-started-box {
    max-width: 700px;
    margin: 0 auto;
    background: var(--color-white);
    border: var(--border-thick);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-hard-lg);
}

.get-started-info {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-cream);
    border: var(--border-thin);
    box-shadow: var(--shadow-hard-sm);
}

.info-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.get-started-cta {
    text-align: center;
}

/* ============================================
   底部 CTA - 漫画爆炸框风格
   ============================================ */
.final-cta {
    padding: var(--spacing-xl) 0;
    background: var(--color-black);
    border-top: var(--border-thick);
    position: relative;
    overflow: hidden;
}

.final-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: repeating-radial-gradient(
        circle at 20% 50%,
        var(--color-pop-pink) 0px,
        var(--color-pop-pink) 10px,
        transparent 10px,
        transparent 20px
    );
    opacity: 0.3;
}

.final-cta-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.final-cta-title {
    font-family: var(--font-family-heading);
    font-size: clamp(2rem, 6vw, 3.5rem);
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
    color: var(--color-pop-yellow);
    text-shadow:
        4px 4px 0px var(--color-pop-pink),
        -2px -2px 0px var(--color-pop-blue);
    letter-spacing: 3px;
}

.final-cta-desc {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-white);
    font-weight: 500;
}

.final-cta .btn-primary {
    background: var(--color-pop-yellow);
    color: var(--color-black);
}

.final-cta .btn-primary:hover {
    background: var(--color-pop-pink);
}

/* ============================================
   页脚
   ============================================ */
footer {
    padding: var(--spacing-lg) 0;
    background: var(--color-black);
    color: var(--color-white);
    text-align: center;
    border-top: var(--border-thick);
}

footer p {
    font-family: var(--font-family-mono);
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 768px) {
    .section-title {
        font-size: 1.75rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

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

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

    .final-cta-title {
        font-size: 1.75rem;
    }

    .quick-start-box::before {
        font-size: 1rem;
        padding: 0.35rem 1rem;
    }
}

/* ============================================
   动画效果
   ============================================ */
@keyframes wiggle {
    0%, 100% { transform: rotate(-2deg); }
    50% { transform: rotate(2deg); }
}

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

/* 页面加载动画 */
main > section {
    animation: slideIn 0.5s ease-out backwards;
}

main > section:nth-child(1) { animation-delay: 0.1s; }
main > section:nth-child(2) { animation-delay: 0.2s; }
main > section:nth-child(3) { animation-delay: 0.3s; }
main > section:nth-child(4) { animation-delay: 0.4s; }
main > section:nth-child(5) { animation-delay: 0.5s; }
main > section:nth-child(6) { animation-delay: 0.6s; }
main > section:nth-child(7) { animation-delay: 0.7s; }
main > section:nth-child(8) { animation-delay: 0.8s; }
main > section:nth-child(9) { animation-delay: 0.9s; }
main > section:nth-child(10) { animation-delay: 1s; }