@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
    /* 基础深色 - Material Design 推荐 */
    --bg-primary: #0a0a0f;
    --bg-secondary: #121218;
    --surface-1: #1a1a22;
    --surface-2: #22222c;
    --surface-3: #2a2a36;

    /* 边框和分割线 */
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-light: rgba(255, 255, 255, 0.1);
    --border-medium: rgba(255, 255, 255, 0.15);

    /* 文字层级 */
    --text-primary: rgba(255, 255, 255, 0.95);
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    --text-disabled: rgba(255, 255, 255, 0.3);

    /* 强调色 - 低饱和度蓝紫调 */
    --accent-primary: #7c6ff7;
    --accent-secondary: #9b8ff9;
    --accent-muted: rgba(124, 111, 247, 0.15);
    --accent-glow: rgba(124, 111, 247, 0.3);

    /* 状态色 */
    --success: #4ade80;
    --warning: #fbbf24;
    --error: #f87171;

    /* 渐变 */
    --gradient-accent: linear-gradient(135deg, #7c6ff7 0%, #9b8ff9 100%);
    --gradient-surface: linear-gradient(180deg, rgba(26, 26, 34, 0) 0%, rgba(26, 26, 34, 1) 100%);
}

html {
    scroll-behavior: smooth;
}

/* ===== DYNAMIC BACKGROUND ===== */
#network-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.4;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
}

/* ===== NAV ===== */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: 72px;
    padding: 0 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
}

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

.logo img {
    height: 82px;
    width: auto;
}

.logo-badge {
    font-size: 0.65rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    background: var(--surface-2);
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    border: 1px solid var(--border-light);
}

.nav-links {
    display: flex;
    gap: 3rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--text-primary);
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a:hover::after {
    width: 100%;
}

/* 语言切换器 */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 2rem;
    padding: 0.4rem 0.8rem;
    background: var(--surface-1);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.lang-switcher:hover {
    background: var(--surface-2);
    border-color: var(--border-medium);
    color: var(--text-primary);
}

.lang-switcher svg {
    width: 14px;
    height: 14px;
}

/* 语言菜单 */
.lang-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 4rem;
    min-width: 140px;
    background: var(--surface-1);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 101;
    overflow: hidden;
}

.lang-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-item {
    display: block;
    padding: 0.85rem 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border-bottom: 1px solid var(--border-subtle);
}

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

.lang-item:hover {
    background: var(--surface-2);
}

.lang-item.active {
    background: var(--accent-muted);
    color: var(--accent-primary);
}

/* ===== HERO ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 7rem 4rem 0 4rem;
    position: relative;
    z-index: 1;
}

.hero-inner {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5),
    0 0 0 1px var(--border-subtle);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-image img:hover {
    transform: translateY(-8px);
    box-shadow: 0 32px 100px rgba(0, 0, 0, 0.6),
    0 0 0 1px var(--border-light),
    0 0 40px var(--accent-muted);
}

.hero-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 2rem;
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem 1.25rem;
    background: var(--surface-1);
    border-radius: 100px;
    border: 1px solid var(--border-light);
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -3px;
    margin-bottom: 2rem;
    background: linear-gradient(to right, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    line-height: 1.8;
    margin-bottom: 3.5rem;
    font-weight: 400;
}

.hero-actions {
    display: flex;
    gap: 1.25rem;
    align-items: center;
}

/* 下载下拉菜单 */
.download-dropdown {
    position: relative;
    display: inline-block;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.1rem 2.5rem;
    background: var(--surface-1);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid var(--border-light);
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.download-btn:hover {
    background: var(--surface-2);
    border-color: var(--border-medium);
    transform: translateY(-2px);
}

.download-btn .arrow {
    width: 12px;
    height: 12px;
    transition: transform 0.3s ease;
}

.download-dropdown.active .download-btn .arrow {
    transform: rotate(180deg);
}

.download-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    min-width: 260px;
    background: var(--surface-1);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 10;
    overflow: hidden;
}

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

.download-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.2s ease;
    border-bottom: 1px solid var(--border-subtle);
}

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

.download-item:hover {
    background: var(--surface-2);
}

.download-item.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.download-item-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-muted);
    border-radius: 6px;
    flex-shrink: 0;
}

.download-item-icon svg {
    width: 18px;
    height: 18px;
    stroke: var(--accent-primary);
}

.download-item-info {
    flex: 1;
}

.download-item-name {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.download-item-desc {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.download-item-badge {
    font-size: 0.65rem;
    padding: 0.2rem 0.5rem;
    background: var(--accent-muted);
    color: var(--accent-primary);
    border-radius: 4px;
    font-weight: 600;
}

.download-item-badge.recommended {
    background: var(--accent-primary);
    color: white;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.1rem 2.5rem;
    background: var(--text-primary);
    color: var(--bg-primary);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    border-radius: 8px;
    box-shadow: 0 4px 24px rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(255, 255, 255, 0.15);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.1rem 2.5rem;
    background: var(--surface-1);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    border: 1px solid var(--border-light);
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--surface-2);
    border-color: var(--border-medium);
    transform: translateY(-2px);
}

.hero-stats {
    position: absolute;
    bottom: 4rem;
    right: 4rem;
    display: flex;
    gap: 4rem;
}

.stat-item {
    text-align: left;
}

.stat-num {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -2px;
    color: var(--text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-top: 0.5rem;
}

/* ===== DIVIDER ===== */
.divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-subtle), transparent);
    max-width: 1400px;
    margin: 0 auto;
}

/* ===== SECTION COMMON ===== */
section {
    padding: 10rem 4rem;
    position: relative;
}

.section-header {
    max-width: 1400px;
    margin: 0 auto 6rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 3rem;
}

.section-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    letter-spacing: 3px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-num::before {
    content: '';
    width: 40px;
    height: 1px;
    background: var(--text-tertiary);
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -3px;
    line-height: 1.1;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 400px;
    text-align: right;
    line-height: 1.8;
    font-weight: 400;
}

/* ===== SCREENSHOTS ===== */
.screenshots-section {
    padding: 8rem 4rem;
    background: var(--bg-secondary);
}

.screenshots-header {
    max-width: 1400px;
    margin: 0 auto 5rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 3rem;
}

.screenshot-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.screenshot-card {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.screenshot-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-medium);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6),
    0 0 0 1px var(--accent-muted);
}

.screenshot-card img {
    width: 100%;
    height: auto;
    display: block;
}

.screenshot-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem;
    background: linear-gradient(to top, rgba(10, 10, 15, 0.95) 0%, transparent 100%);
}

.screenshot-label h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
}

.screenshot-label p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ===== FEATURES ===== */
.features-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

/* 产品介绍区域 */
.intro-wrap {
    max-width: 1400px;
    margin: 0 auto 6rem;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
    padding: 4rem;
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    border-radius: 24px;
}

.intro-title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.intro-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 1.25rem;
    font-weight: 400;
}

.intro-text strong {
    color: var(--accent-primary);
    font-weight: 600;
}

.intro-image {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5),
    0 0 0 1px var(--border-subtle);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.intro-image:hover {
    transform: translateY(-8px);
    box-shadow: 0 32px 100px rgba(0, 0, 0, 0.6),
    0 0 0 1px var(--border-light),
    0 0 40px var(--accent-muted);
}

.intro-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* 为什么需要 Zeplyn */
.why-section {
    max-width: 1400px;
    margin: 0 auto 6rem;
}

.why-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 3rem;
    color: var(--text-primary);
    text-align: center;
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.why-card {
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 2.5rem;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.why-card:hover {
    background: var(--surface-2);
    border-color: var(--border-light);
    transform: translateY(-4px);
}

.why-icon-wrap {
    width: 40px;
    height: 40px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-muted);
    border-radius: 10px;
}

.why-icon-wrap svg {
    stroke: var(--accent-primary);
}

.why-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.why-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    font-weight: 400;
}

/* 核心优势 */
.advantages-section {
    max-width: 1400px;
    margin: 0 auto;
}

.advantages-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 3rem;
    color: var(--text-primary);
    text-align: center;
}

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

.advantage-card {
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 2.5rem;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-primary);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.advantage-card:hover {
    background: var(--surface-2);
    border-color: var(--border-light);
    transform: translateY(-4px);
}

.advantage-card:hover::before {
    opacity: 1;
}

.advantage-idx {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-tertiary);
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
}

.advantage-icon-wrap {
    width: 48px;
    height: 48px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-2);
    border-radius: 12px;
    border: 1px solid var(--border-light);
}

.advantage-icon-wrap svg {
    stroke: var(--text-secondary);
}

.advantage-card h4 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.advantage-card p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.7;
    font-weight: 400;
}

.feature-card {
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 3rem 2.5rem;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--text-primary);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.feature-card:hover {
    background: var(--surface-2);
    border-color: var(--border-light);
    transform: translateY(-4px);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-idx {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-tertiary);
    letter-spacing: 2px;
    margin-bottom: 2rem;
}

.feature-icon-wrap {
    width: 48px;
    height: 48px;
    margin-bottom: 1.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-2);
    border-radius: 12px;
    border: 1px solid var(--border-light);
}

.feature-icon-wrap svg {
    stroke: var(--text-secondary);
}

.feature-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.8;
    font-weight: 400;
}

/* ===== HOW IT WORKS ===== */
.steps-wrap {
    max-width: 1400px;
    margin: 0 auto;
}

.step {
    display: grid;
    grid-template-columns: 100px 1fr 1.2fr;
    gap: 4rem;
    padding: 4rem 0;
    border-bottom: 1px solid var(--border-subtle);
    align-items: start;
}

.step:first-child {
    border-top: 1px solid var(--border-subtle);
}

.step-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-tertiary);
    letter-spacing: 2px;
    padding-top: 0.5rem;
}

.step h3 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -1px;
    color: var(--text-primary);
}

.step p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.9;
    font-weight: 400;
}

/* ===== TECH ===== */
.tech-section-removed {
    display: none;
}

/* ===== CTA ===== */
.cta {
    padding: 12rem 4rem;
    text-align: center;
    background: var(--bg-secondary);
}

.cta-inner {
    max-width: 800px;
    margin: 0 auto;
    padding: 5rem 4rem;
    border-radius: 24px;
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    position: relative;
    overflow: hidden;
}

.cta-inner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--text-primary);
}

.cta h2 {
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -2px;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.cta p {
    color: var(--text-secondary);
    font-size: 1.15rem;
    margin-bottom: 3.5rem;
    font-weight: 400;
}

.cta-actions {
    display: flex;
    gap: 1.25rem;
    justify-content: center;
}

/* ===== FOOTER ===== */
footer {
    padding: 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-subtle);
}

.footer-left {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    letter-spacing: 0.5px;
}

.footer-right {
    display: flex;
    gap: 3rem;
}

.footer-right a {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    text-decoration: none;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.footer-right a:hover {
    color: var(--text-primary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    nav {
        padding: 0 2rem;
    }

    .nav-links {
        gap: 2rem;
    }

    .lang-switcher {
        margin-left: 1rem;
    }

    .lang-menu {
        right: 2rem;
    }

    .hero {
        padding: 0 2rem;
    }

    .hero-inner {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

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

    .hero-image {
        order: -1;
    }

    .hero-image img {
        max-width: 500px;
        margin: 0 auto;
    }

    .hero h1 {
        letter-spacing: -3px;
    }

    .hero-stats {
        display: none;
    }

    section {
        padding: 6rem 2rem;
    }

    .screenshots-section {
        padding: 5rem 2rem;
    }

    .screenshot-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 2rem;
    }

    .section-desc {
        text-align: left;
        max-width: 100%;
    }

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

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

    footer {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
        padding: 3rem 2rem;
    }

    /* 响应式 - 产品介绍 */
    .intro-wrap {
        grid-template-columns: 1fr;
        gap: 3rem;
        padding: 3rem;
    }

    .intro-image {
        max-width: 600px;
        margin: 0 auto;
    }

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

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

@media (max-width: 640px) {
    .hero h1 {
        font-size: 2rem;
        letter-spacing: -2px;
    }

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

    .btn-primary, .btn-secondary {
        width: 100%;
        justify-content: center;
    }

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

    .cta-inner {
        padding: 3rem 2rem;
    }

    .cta-actions {
        flex-direction: column;
    }

    /* 响应式 - 移动端 */
    .intro-wrap {
        padding: 2rem;
    }

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

    .intro-text {
        font-size: 0.95rem;
    }

    .intro-image {
        max-width: 100%;
    }

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

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

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

/* ===== ANIMATIONS ===== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.reveal-delay-1 {
    transition-delay: 0.1s;
}

.reveal-delay-2 {
    transition-delay: 0.2s;
}

.reveal-delay-3 {
    transition-delay: 0.3s;
}

.reveal-delay-4 {
    transition-delay: 0.4s;
}

.reveal-delay-5 {
    transition-delay: 0.5s;
}