/* ============================================
   SmartMouse 聪明鼠了 - 官网样式
   现代科技感 · 沉稳深蓝 · 适度动效
   ============================================ */

/* ========== 1. 设计令牌 ========== */
:root {
    /* 主色系 */
    --c-primary: #0d2c54;
    --c-primary-mid: #1a5fb4;
    --c-primary-light: #2b7fff;
    --c-accent: #3b82f6;

    /* 背景色 */
    --c-bg: #ffffff;
    --c-bg-alt: #f5f8fc;
    --c-bg-dark: #0d2c54;

    /* 文字色 */
    --c-text: #1a1a2e;
    --c-text-secondary: #4b5563;
    --c-text-muted: #6b7280;
    --c-text-inverse: #ffffff;

    /* 边框与分割 */
    --c-border: #e2e8f0;
    --c-border-light: #eef2f7;

    /* 功能色 */
    --c-success: #059669;
    --c-success-bg: #ecfdf5;
    --c-muted-tag: #9ca3af;
    --c-muted-bg: #f3f4f6;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #0d2c54 0%, #1a3f6e 50%, #1a5fb4 100%);
    --gradient-hero: linear-gradient(160deg, #0a1f3d 0%, #0d2c54 40%, #143d6b 100%);
    --gradient-button: linear-gradient(135deg, #1a5fb4 0%, #2b7fff 100%);
    --gradient-accent: linear-gradient(90deg, #1a5fb4, #2b7fff);

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(13, 44, 84, 0.08);
    --shadow-md: 0 4px 20px rgba(13, 44, 84, 0.10);
    --shadow-lg: 0 12px 40px rgba(13, 44, 84, 0.15);
    --shadow-card: 0 2px 12px rgba(13, 44, 84, 0.06);
    --shadow-hover: 0 8px 30px rgba(13, 44, 84, 0.15);

    /* 圆角 */
    --r-sm: 8px;
    --r-md: 12px;
    --r-lg: 20px;
    --r-pill: 999px;

    /* 间距 */
    --space-section: clamp(60px, 8vw, 100px);
    --container: 1200px;
    --container-pad: clamp(20px, 5vw, 40px);

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;

    /* 过渡 */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition: 0.3s var(--ease-out);
}

/* ========== 2. 基础重置 ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    color: var(--c-text);
    background: var(--c-bg);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

::selection { background: var(--c-accent); color: #fff; }

/* ========== 3. 排版 ========== */
h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.3; color: var(--c-text); letter-spacing: -0.02em; }

.h-display {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

.h-section {
    font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
}

.h-subtitle {
    font-size: clamp(0.95rem, 2vw, 1.1rem);
    color: var(--c-text-muted);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 50px;
    line-height: 1.6;
}

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

/* ========== 4. 布局 ========== */
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--container-pad);
}

.section { padding: var(--space-section) 0; }
.section--alt { background: var(--c-bg-alt); }
.section--dark { background: var(--c-bg-dark); color: var(--c-text-inverse); }
.section--dark h2, .section--dark h3 { color: #fff; }

.section-header { margin-bottom: 50px; }
.section-header .h-section { margin-bottom: 16px; }

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--c-primary-mid);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 14px;
}

.eyebrow::before {
    content: '';
    width: 24px;
    height: 2px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

/* ========== 5. 导航栏 ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--c-border-light);
    transition: box-shadow var(--transition), background var(--transition);
}

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

.nav-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--container-pad);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--c-primary);
    letter-spacing: -0.02em;
}

.nav-logo-mark {
    width: 32px;
    height: 32px;
    border-radius: var(--r-sm);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.7rem;
    font-weight: 800;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--c-text-secondary);
    border-radius: var(--r-sm);
    transition: all var(--transition);
    position: relative;
}

.nav-link:hover { color: var(--c-primary); background: var(--c-bg-alt); }

.nav-link.active {
    color: var(--c-primary);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 16px;
    right: 16px;
    height: 2px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

.nav-cta {
    margin-left: 8px;
    padding: 8px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #fff;
    background: var(--gradient-button);
    border-radius: var(--r-pill);
    transition: transform var(--transition), box-shadow var(--transition);
}

.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 4px 14px rgba(26, 95, 180, 0.4); }

.nav-logo-img { height: 44px; width: auto; object-fit: contain; flex-shrink: 0; }

.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--c-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========== 6. 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--r-pill);
    transition: all var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    color: #fff;
    background: var(--gradient-button);
    box-shadow: 0 4px 14px rgba(26, 95, 180, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(26, 95, 180, 0.4);
}

.btn-outline {
    color: var(--c-primary);
    background: transparent;
    border: 1.5px solid var(--c-border);
}

.btn-outline:hover {
    border-color: var(--c-primary-mid);
    color: var(--c-primary-mid);
    background: var(--c-bg-alt);
}

.btn-light {
    color: var(--c-primary);
    background: #fff;
    border: 1.5px solid rgba(255, 255, 255, 0.9);
}

.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.btn-ghost-light {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(4px);
}

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

.btn-lg { padding: 14px 36px; font-size: 1rem; }

/* ========== 7. 卡片 ========== */
.card {
    background: #fff;
    border: 1px solid var(--c-border-light);
    border-radius: var(--r-md);
    padding: 28px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--c-accent);
}

.card-grid {
    display: grid;
    gap: 24px;
}

.card-grid--2 { grid-template-columns: repeat(2, 1fr); }
.card-grid--3 { grid-template-columns: repeat(3, 1fr); }
.card-grid--4 { grid-template-columns: repeat(4, 1fr); }

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--r-sm);
    background: var(--c-bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    color: var(--c-primary-mid);
    font-size: 1.3rem;
    transition: all var(--transition);
}

.card:hover .card-icon {
    background: var(--gradient-primary);
    color: #fff;
    transform: scale(1.05);
}

.card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.card p { font-size: 0.92rem; color: var(--c-text-secondary); line-height: 1.65; }

/* 数据卡片 */
.stat-card {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--r-md);
    padding: 24px 20px;
    text-align: center;
    transition: all var(--transition);
    backdrop-filter: blur(4px);
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.14);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-4px);
}

.stat-number {
    font-size: clamp(1.6rem, 4vw, 2.2rem);
    font-weight: 800;
    color: #fff;
    line-height: 1;
    margin-bottom: 6px;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.4;
}

/* ========== 8. Hero 区 ========== */
.hero {
    position: relative;
    background: var(--gradient-hero);
    color: #fff;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(43, 127, 255, 0.15) 0%, transparent 60%);
    pointer-events: none;
}

.hero-inner {
    position: relative;
    z-index: 2;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--container-pad);
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--r-pill);
    font-size: 0.82rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 24px;
    backdrop-filter: blur(4px);
}

.hero-badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #4ade80;
    box-shadow: 0 0 8px rgba(74, 222, 128, 0.6);
}

.hero h1 {
    color: #fff;
    font-size: clamp(2.4rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.12;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.2vw, 1.2rem);
    color: rgba(255, 255, 255, 0.75);
    max-width: 640px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    max-width: 800px;
    margin: 0 auto 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== 9. 页面头部（内页通用） ========== */
.page-hero {
    background: var(--gradient-hero);
    color: #fff;
    padding: 100px 0 60px;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

.page-hero-inner { position: relative; z-index: 2; }
.page-hero h1 { color: #fff; font-size: clamp(2rem, 5vw, 2.8rem); margin-bottom: 14px; }
.page-hero p { color: rgba(255, 255, 255, 0.75); font-size: clamp(0.95rem, 2vw, 1.1rem); max-width: 600px; margin: 0 auto; }

/* ========== 10. 对比卡片（适合/不适合） ========== */
.compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.compare-card {
    border-radius: var(--r-md);
    padding: 28px;
    border: 1px solid var(--c-border-light);
}

.compare-card--yes { background: var(--c-success-bg); border-color: #a7f3d0; }
.compare-card--no { background: var(--c-muted-bg); border-color: #e5e7eb; }

.compare-card h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.05rem;
    margin-bottom: 16px;
}

.compare-card--yes h3 { color: var(--c-success); }
.compare-card--no h3 { color: var(--c-muted-tag); }

.compare-card ul li {
    font-size: 0.92rem;
    color: var(--c-text-secondary);
    padding: 6px 0;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    line-height: 1.6;
}

.compare-card--yes ul li::before { content: '✓'; color: var(--c-success); font-weight: 700; flex-shrink: 0; }
.compare-card--no ul li::before { content: '✕'; color: var(--c-muted-tag); flex-shrink: 0; }

/* ========== 11. 时间线 ========== */
.timeline {
    display: flex;
    overflow-x: auto;
    gap: 0;
    padding: 20px 0 10px;
    scrollbar-width: thin;
}

.timeline-step {
    flex: 1;
    min-width: 140px;
    text-align: center;
    position: relative;
    padding: 0 8px;
}

.timeline-step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 20px;
    right: -50%;
    width: 100%;
    height: 2px;
    background: var(--c-border);
    z-index: 0;
}

.timeline-step:not(:last-child)::after { background: linear-gradient(90deg, var(--c-primary-mid), var(--c-border)); }

.timeline-dot {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    position: relative;
    z-index: 1;
    box-shadow: 0 0 0 4px #fff, 0 0 0 5px var(--c-border);
}

.timeline-step p { font-size: 0.85rem; color: var(--c-text-secondary); line-height: 1.5; }

/* ========== 12. 步骤 ========== */
.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    counter-reset: step;
}

.steps--2x2 { grid-template-columns: repeat(2, 1fr); max-width: 800px; margin: 0 auto; }

.step-card {
    background: #fff;
    border: 1px solid var(--c-border-light);
    border-radius: var(--r-md);
    padding: 32px 28px;
    position: relative;
    transition: all var(--transition);
}

.step-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); border-color: var(--c-accent); }

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--r-sm);
    background: var(--gradient-primary);
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 18px;
}

.step-card h3 { font-size: 1.05rem; margin-bottom: 10px; }
.step-card p { font-size: 0.92rem; color: var(--c-text-secondary); line-height: 1.65; }

/* ========== 13. FAQ 手风琴 ========== */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
    border: 1px solid var(--c-border-light);
    border-radius: var(--r-md);
    margin-bottom: 12px;
    overflow: hidden;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.faq-item.open { border-color: var(--c-accent); box-shadow: var(--shadow-sm); }

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--c-text);
    text-align: left;
    transition: color var(--transition);
}

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

.faq-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    margin-left: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--c-text-muted);
    transition: transform var(--transition);
    font-size: 1.3rem;
    font-weight: 300;
}

.faq-item.open .faq-icon { transform: rotate(45deg); color: var(--c-primary-mid); }

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s var(--ease-smooth);
}

.faq-answer-inner {
    padding: 0 24px 20px;
    font-size: 0.92rem;
    color: var(--c-text-secondary);
    line-height: 1.7;
}

/* ========== 14. 活动卡片 ========== */
.activity-list { display: flex; flex-direction: column; gap: 14px; }

.activity-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: #fff;
    border: 1px solid var(--c-border-light);
    border-radius: var(--r-md);
    padding: 20px 24px;
    transition: all var(--transition);
}

.activity-card:hover {
    border-color: var(--c-accent);
    box-shadow: var(--shadow-card);
    transform: translateX(4px);
}

.activity-badge {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: var(--r-sm);
    background: var(--gradient-primary);
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    line-height: 1.2;
    text-align: center;
}

.activity-badge span { font-size: 1.1rem; font-weight: 700; }

.activity-info { flex: 1; }
.activity-info h3 { font-size: 1.02rem; margin-bottom: 4px; }
.activity-info p { font-size: 0.88rem; color: var(--c-text-muted); }

/* ========== 15. 信息条目 ========== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 20px;
    background: #fff;
    border: 1px solid var(--c-border-light);
    border-radius: var(--r-md);
}

.info-item-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: var(--r-sm);
    background: var(--c-bg-alt);
    color: var(--c-primary-mid);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.info-item-text h4 { font-size: 0.95rem; margin-bottom: 4px; }
.info-item-text p { font-size: 0.88rem; color: var(--c-text-muted); line-height: 1.5; }

/* ========== 16. 理念卡片 ========== */
.principle-list { display: flex; flex-direction: column; gap: 20px; max-width: 800px; margin: 0 auto; }

.principle-item {
    display: flex;
    gap: 20px;
    padding: 28px;
    background: #fff;
    border: 1px solid var(--c-border-light);
    border-radius: var(--r-md);
    transition: all var(--transition);
}

.principle-item:hover { box-shadow: var(--shadow-hover); border-color: var(--c-accent); }

.principle-number {
    flex-shrink: 0;
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}

.principle-item h3 { font-size: 1.1rem; margin-bottom: 8px; }
.principle-item p { font-size: 0.92rem; color: var(--c-text-secondary); line-height: 1.65; }

/* ========== 17. 团队表格 ========== */
.team-table {
    width: 100%;
    border-collapse: collapse;
    border-radius: var(--r-md);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.team-table th {
    background: var(--c-primary);
    color: #fff;
    padding: 14px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: left;
}

.team-table td {
    padding: 14px 20px;
    background: #fff;
    border-bottom: 1px solid var(--c-border-light);
    font-size: 0.92rem;
}

.team-table tr:last-child td { border-bottom: none; }
.team-table tr:hover td { background: var(--c-bg-alt); }

/* ========== 18. 二维码占位 ========== */
.qr-placeholder {
    width: 160px;
    height: 160px;
    border-radius: var(--r-md);
    background: var(--c-bg-alt);
    border: 2px dashed var(--c-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--c-text-muted);
    font-size: 0.78rem;
    text-align: center;
    gap: 6px;
}

.qr-placeholder-icon { font-size: 2rem; opacity: 0.4; }

.qr-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    padding: 32px;
    background: #fff;
    border: 1px solid var(--c-border-light);
    border-radius: var(--r-lg);
    text-align: center;
    transition: all var(--transition);
}

.qr-card:hover { box-shadow: var(--shadow-hover); }

.qr-card h3 { font-size: 1rem; }
.qr-card p { font-size: 0.85rem; color: var(--c-text-muted); }

/* ========== 19. 照片占位 ========== */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.photo-placeholder {
    aspect-ratio: 4/3;
    border-radius: var(--r-md);
    background: var(--c-bg-alt);
    border: 2px dashed var(--c-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--c-text-muted);
    font-size: 0.85rem;
    gap: 8px;
    transition: all var(--transition);
}

.photo-placeholder:hover { border-color: var(--c-accent); color: var(--c-primary-mid); }
.photo-placeholder-icon { font-size: 2.5rem; opacity: 0.3; }

/* ========== 20. CTA 区 ========== */
.cta-banner {
    background: var(--gradient-primary);
    border-radius: var(--r-lg);
    padding: clamp(32px, 5vw, 56px);
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
    background-size: 40px 40px;
}

.cta-banner > * { position: relative; z-index: 2; }
.cta-banner h2 { color: #fff; font-size: clamp(1.5rem, 3.5vw, 2rem); margin-bottom: 14px; }
.cta-banner p { color: rgba(255, 255, 255, 0.8); margin-bottom: 28px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* ========== 21. 联系卡片 ========== */
.contact-card {
    background: #fff;
    border: 1px solid var(--c-border-light);
    border-radius: var(--r-lg);
    padding: 36px;
    box-shadow: var(--shadow-card);
}

.contact-row {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 0;
    border-bottom: 1px solid var(--c-border-light);
}

.contact-row:last-child { border-bottom: none; }

.contact-row-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--r-sm);
    background: var(--c-bg-alt);
    color: var(--c-primary-mid);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.contact-row-label { font-size: 0.82rem; color: var(--c-text-muted); margin-bottom: 2px; }
.contact-row-value { font-size: 0.98rem; font-weight: 500; color: var(--c-text); }

/* ========== 22. 页脚 ========== */
.footer {
    background: var(--c-primary);
    color: rgba(255, 255, 255, 0.7);
    padding: 50px 0 30px;
}

.footer-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--container-pad);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 800;
    color: #fff;
}

.footer-slogan { font-size: 1.1rem; font-weight: 600; color: rgba(255, 255, 255, 0.9); letter-spacing: 0.02em; }

.footer-logo-img { height: 56px; width: auto; object-fit: contain; }

.footer-contact {
    display: flex;
    flex-wrap: wrap;
    gap: 14px 40px;
    justify-content: center;
}

.footer-contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.footer-contact-label {
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-contact-value {
    font-size: 0.92rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
}

.footer-contact-note {
    font-size: 0.72rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom {
    margin-top: 10px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ========== 23. 动画 ========== */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.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; }

/* ========== 24. 工具类 ========== */
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }
.mx-auto { margin-left: auto; margin-right: auto; }
.max-600 { max-width: 600px; }
.max-800 { max-width: 800px; }

.highlight-box {
    background: var(--c-bg-alt);
    border-left: 3px solid var(--c-primary-mid);
    border-radius: 0 var(--r-sm) var(--r-sm) 0;
    padding: 20px 24px;
    margin: 24px 0;
}

.highlight-box p { font-size: 0.95rem; color: var(--c-text); line-height: 1.7; }

.tag {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.78rem;
    font-weight: 500;
    border-radius: var(--r-pill);
    background: var(--c-bg-alt);
    color: var(--c-primary-mid);
}

.divider {
    height: 1px;
    background: var(--c-border);
    margin: 40px 0;
}

/* ========== 25. 响应式 ========== */
@media (max-width: 968px) {
    .card-grid--4 { grid-template-columns: repeat(2, 1fr); }
    .card-grid--3 { grid-template-columns: repeat(2, 1fr); }
    .info-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: 1fr; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); max-width: 500px; }
    .photo-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    :root { --space-section: 48px; }

    .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        padding: 16px;
        gap: 4px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--c-border-light);
        transform: translateY(-150%);
        transition: transform 0.3s var(--ease-out);
        max-height: calc(100vh - 64px);
        overflow-y: auto;
    }

    .nav-links.open { transform: translateY(0); }
    .nav-link { padding: 12px 16px; }
    .nav-link.active::after { display: none; }
    .nav-link.active { background: var(--c-bg-alt); }
    .nav-cta { margin: 8px 0 0; text-align: center; }
    .nav-toggle { display: flex; }

    .card-grid--2, .card-grid--3, .card-grid--4 { grid-template-columns: 1fr; }
    .info-grid { grid-template-columns: 1fr; }
    .compare-grid { grid-template-columns: 1fr; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .photo-grid { grid-template-columns: 1fr; }
    .principle-item { flex-direction: column; gap: 8px; }
    .activity-card { flex-direction: column; align-items: flex-start; text-align: left; }
    .footer-contact { flex-direction: column; gap: 16px; }
    .timeline-step { min-width: 100px; }
    .hero-actions { flex-direction: column; align-items: stretch; }
    .hero-actions .btn { width: 100%; }
    .contact-grid { grid-template-columns: 1fr !important; }
    .contact-grid .qr-card { justify-self: center; }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    .reveal { opacity: 1; transform: none; }
}