/* ============================================================
   礼簿尚书官网 - 公共样式 (MacWk 风格重制版)
   设计理念：极简主义 · 毛玻璃效果 · 精致阴影 · 流畅动画
   ============================================================ */

/* ========== CSS 变量基础 ========== */
:root {
    --font-display: 'Noto Serif SC', 'STSong', 'SimSun', serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --radius-xs: 6px;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06), 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.12), 0 8px 24px rgba(0, 0, 0, 0.06);
    --shadow-glow: 0 0 40px rgba(196, 30, 58, 0.15);
}

/* ========== 主题系统 - 中国红 (默认) ========== */
[data-theme="china-red"] {
    --color-primary: #C41E3A;
    --color-primary-rgb: 196, 30, 58;
    --color-primary-light: #E63950;
    --color-primary-dark: #9A1830;
    --color-primary-bg: rgba(196, 30, 58, 0.06);
    --color-secondary: #D4A574;
    --color-accent: #FFD700;
    --color-bg: #FAF7F5;
    --color-bg-card: #FFFFFF;
    --color-bg-section: #F5F0EC;
    --color-bg-elevated: #FFFFFF;
    --color-bg-dark: #1A0A08;
    --color-text: #2C1810;
    --color-text-secondary: #5C4A3D;
    --color-text-muted: #9B8A7C;
    --color-border: rgba(196, 30, 58, 0.10);
    --color-border-hover: rgba(196, 30, 58, 0.20);
    --gradient-hero-from: linear-gradient(135deg, #FFF5F0 0%, #FAF7F5 50%, #FFF0EB 100%);
    --gradient-card: linear-gradient(145deg, #FFFFFF 0%, #FFFBF8 100%);
    --shadow-card: 0 2px 16px rgba(196, 30, 58, 0.06);
    --shadow-card-hover: 0 8px 36px rgba(196, 30, 58, 0.14);
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(196, 30, 58, 0.08);
}

/* ========== 复古金 ========== */
[data-theme="vintage"] {
    --color-primary: #8B6914;
    --color-primary-rgb: 139, 105, 20;
    --color-primary-light: #A67C00;
    --color-primary-dark: #6B5010;
    --color-primary-bg: rgba(139, 105, 20, 0.07);
    --color-secondary: #C4956A;
    --color-accent: #D4AF37;
    --color-bg: #FBF8F0;
    --color-bg-card: #FFFDF5;
    --color-bg-section: #F5EDE0;
    --color-bg-elevated: #FFFDF5;
    --color-bg-dark: #2A1E0A;
    --color-text: #3D2B1F;
    --color-text-secondary: #5D4E37;
    --color-text-muted: #8B8070;
    --color-border: rgba(139, 105, 20, 0.12);
    --color-border-hover: rgba(139, 105, 20, 0.25);
    --gradient-hero-from: linear-gradient(135deg, #FFFDF0 0%, #FBF8F0 50%, #F8F4E8 100%);
    --gradient-card: linear-gradient(145deg, #FFFDF5 0%, #FFF9ED 100%);
    --shadow-card: 0 2px 16px rgba(139, 105, 20, 0.07);
    --shadow-card-hover: 0 8px 36px rgba(139, 105, 20, 0.16);
    --glass-bg: rgba(255, 253, 245, 0.75);
    --glass-border: rgba(139, 105, 20, 0.10);
}

/* ========== 护眼绿 ========== */
[data-theme="eyecare"] {
    --color-primary: #4A8C59;
    --color-primary-rgb: 74, 140, 89;
    --color-primary-light: #5BAF6E;
    --color-primary-dark: #3A7046;
    --color-primary-bg: rgba(74, 140, 89, 0.07);
    --color-secondary: #7DB87A;
    --color-accent: #A8D08D;
    --color-bg: #F4F7F3;
    --color-bg-card: #FFFFFF;
    --color-bg-section: #EBF2EA;
    --color-bg-elevated: #FFFFFF;
    --color-bg-dark: #1A2E1F;
    --color-text: #2D3B2D;
    --color-text-secondary: #4A5D4A;
    --color-text-muted: #7A8D7A;
    --color-border: rgba(74, 140, 89, 0.12);
    --color-border-hover: rgba(74, 140, 89, 0.25);
    --gradient-hero-from: linear-gradient(135deg, #F0F7EF 0%, #F4F7F3 50%, #EFF5EE 100%);
    --gradient-card: linear-gradient(145deg, #FFFFFF 0%, #FAFCF9 100%);
    --shadow-card: 0 2px 16px rgba(74, 140, 89, 0.07);
    --shadow-card-hover: 0 8px 36px rgba(74, 140, 89, 0.14);
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(74, 140, 89, 0.10);
}

/* ========== 天青色 ========== */
[data-theme="celadon"] {
    --color-primary: #3A8E8E;
    --color-primary-rgb: 58, 142, 142;
    --color-primary-light: #4AB3B3;
    --color-primary-dark: #2C7070;
    --color-primary-bg: rgba(58, 142, 142, 0.07);
    --color-secondary: #6BB3B3;
    --color-accent: #87CEEB;
    --color-bg: #F2F7F7;
    --color-bg-card: #FFFFFF;
    --color-bg-section: #E6F0F0;
    --color-bg-elevated: #FFFFFF;
    --color-bg-dark: #0A2020;
    --color-text: #1A3D3D;
    --color-text-secondary: #2F5F5F;
    --color-text-muted: #608888;
    --color-border: rgba(58, 142, 142, 0.12);
    --color-border-hover: rgba(58, 142, 142, 0.25);
    --gradient-hero-from: linear-gradient(135deg, #EEF7F7 0%, #F2F7F7 50%, #EAF4F4 100%);
    --gradient-card: linear-gradient(145deg, #FFFFFF 0%, #F8FCFC 100%);
    --shadow-card: 0 2px 16px rgba(58, 142, 142, 0.07);
    --shadow-card-hover: 0 8px 36px rgba(58, 142, 142, 0.14);
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(58, 142, 142, 0.10);
}

/* ========== 明亮蓝 ========== */
[data-theme="bright"] {
    --color-primary: #2563EB;
    --color-primary-rgb: 37, 99, 235;
    --color-primary-light: #3B82F6;
    --color-primary-dark: #1D4ED8;
    --color-primary-bg: rgba(37, 99, 235, 0.05);
    --color-secondary: #10B981;
    --color-accent: #8B5CF6;
    --color-bg: #F8FAFC;
    --color-bg-card: #FFFFFF;
    --color-bg-section: #F1F5F9;
    --color-bg-elevated: #FFFFFF;
    --color-bg-dark: #0F172A;
    --color-text: #1E293B;
    --color-text-secondary: #475569;
    --color-text-muted: #94A3B8;
    --color-border: rgba(37, 99, 235, 0.10);
    --color-border-hover: rgba(37, 99, 235, 0.22);
    --gradient-hero-from: linear-gradient(135deg, #EEF2FF 0%, #F8FAFC 50%, #F0F4FF 100%);
    --gradient-card: linear-gradient(145deg, #FFFFFF 0%, #FAFBFE 100%);
    --shadow-card: 0 2px 16px rgba(37, 99, 235, 0.06);
    --shadow-card-hover: 0 8px 36px rgba(37, 99, 235, 0.14);
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(37, 99, 235, 0.08);
}

/* ========== 暗黑模式 ========== */
[data-theme="dark"] {
    --color-primary: #F43F5E;
    --color-primary-rgb: 244, 63, 94;
    --color-primary-light: #FB7185;
    --color-primary-dark: #E11D48;
    --color-primary-bg: rgba(244, 63, 94, 0.10);
    --color-secondary: #FBBF24;
    --color-accent: #A78BFA;
    --color-bg: #0B1120;
    --color-bg-card: #151D2E;
    --color-bg-section: #111827;
    --color-bg-elevated: #1E293B;
    --color-bg-dark: #030712;
    --color-text: #F1F5F9;
    --color-text-secondary: #CBD5E1;
    --color-text-muted: #64748B;
    --color-border: rgba(255, 255, 255, 0.07);
    --color-border-hover: rgba(255, 255, 255, 0.15);
    --gradient-hero-from: linear-gradient(135deg, #111827 0%, #0B1120 50%, #0F172A 100%);
    --gradient-card: linear-gradient(145deg, #1A2338 0%, #151D2E 100%);
    --shadow-card: 0 2px 16px rgba(0, 0, 0, 0.3);
    --shadow-card-hover: 0 8px 36px rgba(0, 0, 0, 0.45);
    --glass-bg: rgba(21, 29, 46, 0.82);
    --glass-border: rgba(255, 255, 255, 0.06);
}

/* ========== 基础重置 ========== */
*, *::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-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.65;
    overflow-x: hidden;
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

::selection {
    background: rgba(var(--color-primary-rgb), 0.18);
    color: var(--color-text);
}

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

a:hover { color: var(--color-primary-light); }

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

/* ========== 容器 ========== */
.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 28px;
}

.container-wide {
    max-width: 1360px;
    margin: 0 auto;
    padding: 0 28px;
}

/* ========== 导航栏 - MacWk 毛玻璃风格 ========== */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    height: 68px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    transition: all var(--transition-smooth);
}

.header.scrolled {
    height: 62px;
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
    border-bottom-color: transparent;
}

[data-theme="dark"] .header.scrolled {
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.3);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 28px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 11px;
    text-decoration: none;
    color: var(--color-text);
    flex-shrink: 0;
}

.logo-icon {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-smooth);
}

.logo-icon img { width: 100%; height: 100%; object-fit: cover; }

.logo:hover .logo-icon { transform: scale(1.06) rotate(-2deg); }

.logo-text {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-primary);
}

.nav {
    display: flex;
    align-items: center;
    gap: 2px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 18px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: transform var(--transition-smooth);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    transform: translateX(-50%) scaleX(1);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-shrink: 0;
}

/* 主题切换器 - 圆点式 */
.theme-switcher {
    display: flex;
    gap: 5px;
    padding: 5px;
    background: var(--color-bg-section);
    border-radius: 28px;
    border: 1px solid var(--color-border);
}

.theme-btn {
    width: 18px;
    height: 18px;
    border: 2px solid transparent;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-smooth);
    position: relative;
    outline: none;
}

.theme-btn::before {
    content: attr(data-name);
    position: absolute;
    bottom: calc(100% + -50px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    font-size: 11px;
    color: var(--color-text-muted);
    white-space: nowrap;
    padding: 4px 8px;
    background: var(--color-bg-card);
    border-radius: var(--radius-xs);
    box-shadow: var(--shadow-md);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-fast);
}

.theme-btn:hover::before {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.theme-btn.china-red { background: linear-gradient(135deg, #C41E3A, #E63950); }
.theme-btn.vintage { background: linear-gradient(135deg, #8B6914, #D4AF37); }
.theme-btn.eyecare { background: linear-gradient(135deg, #4A8C59, #7AAF7A); }
.theme-btn.celadon { background: linear-gradient(135deg, #3A8E8E, #6AAFAF); }
.theme-btn.bright { background: linear-gradient(135deg, #2563EB, #3B82F6); }
.theme-btn.dark { 
    background: linear-gradient(135deg, #1a1a2e, #16213e); 
    border-color: rgba(255,255,255,0.15);
}

.theme-btn.active {
    transform: scale(1.22);
    border-color: var(--color-text);
    box-shadow: 0 0 0 3px var(--color-bg-section), 0 2px 10px rgba(0,0,0,0.15);
}

/* 按钮系统 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 24px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all var(--transition-smooth);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 2px 12px rgba(var(--color-primary-rgb), 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(var(--color-primary-rgb), 0.35);
    color: #fff;
}

.btn-primary:active { transform: translateY(0); }

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

.btn-outline:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    padding: 8px 16px;
}

.btn-ghost:hover {
    background: var(--color-bg-section);
    color: var(--color-primary);
}

.btn-lg { padding: 14px 32px; font-size: 15px; border-radius: var(--radius-md); }
.btn-sm { padding: 7px 16px; font-size: 13px; }
.btn-icon { width: 42px; height: 42px; padding: 0; border-radius: 50%; }

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--color-bg-section);
    border-radius: var(--radius-sm);
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: all var(--transition-fast);
}

.mobile-menu-btn span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-smooth);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== 页面 Hero 区域 ========== */
.page-hero {
    padding: 130px 0 70px;
    text-align: center;
    background: var(--gradient-hero-from);
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 20% 50%, rgba(var(--color-primary-rgb), 0.04) 0%, transparent 50%),
                      radial-gradient(circle at 80% 20%, rgba(var(--color-primary-rgb), 0.03) 0%, transparent 40%);
    pointer-events: none;
}

.page-hero::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

.page-hero .container { position: relative; z-index: 1; }

.page-hero h1 {
    font-family: var(--font-display);
    font-size: 44px;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    color: var(--color-text);
}

.page-hero p {
    font-size: 17px;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ========== 面包屑导航 ========== */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 0 0;
    font-size: 13px;
    color: var(--color-text-muted);
    justify-content: center;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.breadcrumb a:hover {
    color: var(--color-primary);
}

.breadcrumb svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.breadcrumb .separator {
    color: var(--color-text-muted);
    opacity: 0.5;
    font-size: 11px;
}

.breadcrumb .current {
    color: var(--color-text);
    font-weight: 500;
}

/* ========== 内容区块 ========== */
.section {
    padding: 90px 0;
    position: relative;
}

.section-alt {
    background: var(--color-bg-section);
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 56px;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 18px;
    background: var(--color-primary-bg);
    border: 1px solid var(--color-border);
    color: var(--color-primary);
    border-radius: 24px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 18px;
    letter-spacing: 0.01em;
}

.section-title {
    font-family: var(--font-display);
    font-size: 36px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: 14px;
    line-height: 1.25;
}

.section-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.75;
}

/* ========== 卡片组件 - MacWk 风格 ========== */
.card {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

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

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

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: white;
    flex-shrink: 0;
    transition: transform var(--transition-smooth);
}

.card:hover .card-icon { transform: scale(1.08); }

.card-icon.red { background: linear-gradient(135deg, #DC143C, #FF4D6A); }
.card-icon.gold { background: linear-gradient(135deg, #D4A574, #E8C49A); }
.card-icon.blue { background: linear-gradient(135deg, #2563EB, #60A5FA); }
.card-icon.green { background: linear-gradient(135deg, #10B981, #34D399); }
.card-icon.purple { background: linear-gradient(135deg, #8B5CF6, #A78BFA); }
.card-icon.pink { background: linear-gradient(135deg, #EC4899, #F472B6); }
.card-icon.cyan { background: linear-gradient(135deg, #06B6D4, #22D3EE); }
.card-icon.orange { background: linear-gradient(135deg, #F97316, #FB923C); }
.card-icon.teal { background: linear-gradient(135deg, #14B8A6, #2DD4BF); }
.card-icon.indigo { background: linear-gradient(135deg, #4F46E5, #818CF8); }

.card-icon svg { width: 26px; height: 26px; }

.card-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.card-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 14px;
}

.card-tag {
    padding: 4px 12px;
    background: var(--color-bg-section);
    border-radius: 20px;
    font-size: 12px;
    color: var(--color-text-muted);
    font-weight: 500;
}

.card-tag.vip {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.15), rgba(212, 175, 55, 0.08));
    color: #B8860B;
    border: 1px solid rgba(212, 175, 55, 0.2);
}

.card-tag.hot {
    background: linear-gradient(135deg, rgba(220, 20, 60, 0.08), rgba(220, 20, 60, 0.04));
    color: #DC143C;
    border: 1px solid rgba(220, 20, 60, 0.12);
}

/* ========== 网格布局 ========== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ========== 统计数据栏 ========== */
.stats-bar {
    display: flex;
    justify-content: center;
    gap: 48px;
    padding: 44px 40px;
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
}

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

.stat-value {
    font-family: var(--font-display);
    font-size: 42px;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.stat-label {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 6px;
    font-weight: 500;
}

/* ========== 步骤流程 ========== */
.steps {
    display: flex;
    justify-content: space-between;
    position: relative;
    gap: 20px;
}

.steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 12%;
    right: 12%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-border), var(--color-primary), var(--color-border));
    border-radius: 2px;
    z-index: 0;
}

.step {
    text-align: center;
    position: relative;
    z-index: 1;
    flex: 1;
}

.step-number {
    width: 76px;
    height: 76px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 18px;
    color: white;
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 900;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    transition: transform var(--transition-smooth);
    position: relative;
}

.step-number::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    border: 2px dashed rgba(255,255,255,0.3);
    animation: spin 20s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.step:hover .step-number { transform: scale(1.08); }

.step:nth-child(1) .step-number { background: linear-gradient(135deg, #DC143C, #FF6B81); }
.step:nth-child(2) .step-number { background: linear-gradient(135deg, #D4A574, #E8C49A); color: #3D2B1F; }
.step:nth-child(3) .step-number { background: linear-gradient(135deg, #10B981, #34D399); }

.step-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.step-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
    max-width: 190px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ========== 用户评价 ========== */
.testimonial {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: 30px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-smooth);
    position: relative;
}

.testimonial::before {
    content: '"';
    position: absolute;
    top: 18px;
    right: 24px;
    font-size: 64px;
    font-family: Georgia, serif;
    color: var(--color-primary);
    opacity: 0.08;
    line-height: 1;
}

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

.testimonial-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    flex-shrink: 0;
}

.testimonial:nth-child(1) .testimonial-avatar { background: linear-gradient(135deg, #DC143C, #FF6B81); }
.testimonial:nth-child(2) .testimonial-avatar { background: linear-gradient(135deg, #10B981, #34D399); }
.testimonial:nth-child(3) .testimonial-avatar { background: linear-gradient(135deg, #8B5CF6, #A78BFA); }
.testimonial:nth-child(4) .testimonial-avatar { background: linear-gradient(135deg, #06B6D4, #06B6D4); }

.testimonial-content {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 18px;
    font-style: italic;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

.author-name {
    font-weight: 600;
    font-size: 14px;
    color: var(--color-text);
}
.author-location { font-size: 12px; color: var(--color-text-muted); }

.testimonial-tags { display: flex; gap: 6px; }

.testimonial-tag {
    padding: 3px 10px;
    background: var(--color-primary-bg);
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    color: var(--color-primary);
}

/* ========== 截图卡片 ========== */
.screenshot-card {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: 14px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    cursor: pointer;
    transition: all var(--transition-smooth);
    overflow: hidden;
}

.screenshot-card:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-border-hover);
}

.screenshot-img {
    width: 100%;
    aspect-ratio: 9/19.5;
    background: var(--color-bg-section);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.screenshot-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.screenshot-card:hover .screenshot-img img { transform: scale(1.04); }

.screenshot-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    text-align: center;
}

/* ========== 表单样式 ========== */
.form-group { margin-bottom: 22px; }

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
    letter-spacing: 0.01em;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 13px 18px;
    background: var(--color-bg-section);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--color-text);
    transition: all var(--transition-smooth);
    font-family: var(--font-body);
    outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.1);
    background: var(--color-bg-card);
}

.form-input::placeholder,
.form-textarea::placeholder { color: var(--color-text-muted); }

.form-textarea { resize: vertical; min-height: 110px; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ========== Footer ========== */
.footer {
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    padding: 72px 0 28px;
    position: relative;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 44px;
    margin-bottom: 52px;
}

.footer-brand .logo { margin-bottom: 16px; }

.footer-brand p {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-width: 280px;
}

.footer-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 18px;
    letter-spacing: 0.01em;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 13px;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    padding: 2px 0;
}

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

.qr-codes { display: flex; gap: 20px; }

.qr-code-item { text-align: center; }

.qr-code-box {
    width: 100px;
    height: 100px;
    background: var(--color-bg-section);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: transform var(--transition-smooth);
}

.qr-code-box:hover { transform: scale(1.05); }

.qr-code-box img { width: 92%; height: 92%; object-fit: contain; }

.qr-code-label { font-size: 12px; color: var(--color-text-muted); }

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 14px;
}

.copyright { font-size: 12px; color: var(--color-text-muted); }

.footer-legal { display: flex; gap: 20px; }

.footer-legal a {
    font-size: 12px;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

/* ========== CTA 行动召唤区域 ========== */
.cta-section {
    padding: 72px 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
}

.cta-section::after {
    content: '';
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 50%);
    pointer-events: none;
}

.cta-content { position: relative; z-index: 1; }

.cta-title {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 700;
    color: white;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.cta-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.88);
    margin-bottom: 28px;
}

.cta-btn {
    background: white;
    color: var(--color-primary);
    padding: 14px 36px;
    font-size: 15px;
    font-weight: 700;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.22);
    color: var(--color-primary);
}

/* ========== Lightbox 图片查看器（增强版 - 缩放/拖动/旋转） ========== */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(20px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 40px;
    animation: fadeIn 0.25s ease;
    user-select: none;
    -webkit-user-select: none;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.lightbox.active { display: flex; }

.lightbox-content {
    max-width: 90vw;
    max-height: 88vh;
    position: relative;
    animation: zoomIn 0.3s ease;
}

@keyframes zoomIn {
    from { transform: scale(0.92); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.lightbox-content img {
    max-width: 90vw;
    max-height: 80vh;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.5);
    transition: transform 0.15s ease;
    cursor: zoom-in;
    transform-origin: center center;
    will-change: transform;
}

.lightbox-content img.dragging {
    transition: none;
    cursor: grabbing;
}

/* 关闭按钮 */
.lightbox-close {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 50%;
    color: white;
    font-size: 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    backdrop-filter: blur(8px);
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
    border-color: rgba(255, 255, 255, 0.25);
}

/* 工具栏 */
.lightbox-toolbar {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-radius: 28px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 10;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.lightbox-btn {
    width: 38px;
    height: 38px;
    border: none;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.85);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    padding: 0;
    outline: none;
}

.lightbox-btn:hover {
    background: rgba(255, 255, 255, 0.18);
    color: white;
    transform: scale(1.08);
}

.lightbox-btn:active {
    transform: scale(0.95);
    background: rgba(255, 255, 255, 0.25);
}

.lightbox-btn svg {
    width: 18px;
    height: 18px;
    pointer-events: none;
}

/* 缩放比例显示 */
.lightbox-zoom-level {
    font-size: 12px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.6);
    min-width: 42px;
    text-align: center;
    padding: 0 6px;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
}

/* 操作提示 */
.lightbox-hint {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 12px 24px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 20;
}

.lightbox-hint.show {
    opacity: 1;
}

/* 侧边导航箭头 */
.lightbox-nav {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 52px;
    height: 52px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-smooth);
    z-index: 10;
    padding: 0;
    outline: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.lightbox-nav svg {
    width: 24px;
    height: 24px;
    pointer-events: none;
}

.lightbox-nav:hover {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-50%) scale(1.08);
    box-shadow: 0 6px 28px rgba(0, 0, 0, 0.4);
}

.lightbox-nav:active {
    transform: translateY(-50%) scale(0.95);
}

.lightbox-nav-prev {
    left: 24px;
}

.lightbox-nav-next {
    right: 24px;
}

.lightbox-nav.disabled {
    opacity: 0.25;
    cursor: not-allowed;
    pointer-events: none;
}

/* 图片计数器 */
.lightbox-counter {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 18px;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.7);
    font-size: 13px;
    font-weight: 600;
    z-index: 10;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.02em;
    display: none;
}

/* 禁用状态的按钮 */
.lightbox-btn.disabled {
    opacity: 0.25;
    cursor: not-allowed;
    pointer-events: none;
}

/* 工具栏分隔符 */
.lightbox-toolbar .lightbox-zoom-level {
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    margin: 0 2px;
}

/* 响应式适配 */
@media (max-width: 768px) {
    .lightbox {
        padding: 20px;
    }

    .lightbox-content img {
        max-width: 95vw;
        max-height: 75vh;
    }

    .lightbox-toolbar {
        bottom: 16px;
        padding: 6px 10px;
        gap: 4px;
    }

    .lightbox-btn {
        width: 34px;
        height: 34px;
    }

    .lightbox-btn svg {
        width: 16px;
        height: 16px;
    }

    .lightbox-zoom-level {
        font-size: 11px;
        min-width: 36px;
    }

    .lightbox-close {
        top: 12px;
        right: 12px;
        width: 38px;
        height: 38px;
    }

    .lightbox-nav {
        width: 42px;
        height: 42px;
    }

    .lightbox-nav svg {
        width: 20px;
        height: 20px;
    }

    .lightbox-nav-prev {
        left: 12px;
    }

    .lightbox-nav-next {
        right: 12px;
    }

    .lightbox-counter {
        top: 14px;
        font-size: 12px;
        padding: 5px 14px;
    }
}

@media (max-width: 480px) {
    .lightbox {
        padding: 10px;
    }

    .lightbox-content img {
        max-width: 98vw;
        max-height: 70vh;
    }

    .lightbox-toolbar {
        bottom: 12px;
        gap: 3px;
        padding: 5px 8px;
    }

    .lightbox-btn {
        width: 32px;
        height: 32px;
    }

    .lightbox-nav {
        width: 36px;
        height: 36px;
    }

    .lightbox-nav svg {
        width: 18px;
        height: 18px;
    }

    .lightbox-nav-prev {
        left: 8px;
    }

    .lightbox-nav-next {
        right: 8px;
    }

    .lightbox-counter {
        top: 10px;
        font-size: 11px;
        padding: 4px 12px;
    }
}

/* ========== 移动端导航 ========== */
.mobile-nav {
    position: fixed;
    top: 68px;
    left: 0; right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 12px;
    border-bottom: 1px solid var(--color-border);
    display: none;
    z-index: 999;
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.25s ease;
}

@keyframes slideDown {
    from { transform: translateY(-10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.mobile-nav.active { display: block; }

.mobile-nav .nav-link {
    display: block;
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    text-align: center;
}

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

.mobile-theme-switcher {
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 14px 18px;
    border-top: 1px solid var(--color-border);
    margin-top: 6px;
}

/* ========== 滚动动画 ========== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-delay-1 { transition-delay: 0.08s; }
.fade-in-delay-2 { transition-delay: 0.16s; }
.fade-in-delay-3 { transition-delay: 0.24s; }
.fade-in-delay-4 { transition-delay: 0.32s; }
.fade-in-delay-5 { transition-delay: 0.40s; }

/* 左右滑入 */
.slide-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.slide-left.visible { opacity: 1; transform: translateX(0); }

.slide-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.slide-right.visible { opacity: 1; transform: translateX(0); }

/* 缩放进入 */
.scale-in {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.scale-in.visible { opacity: 1; transform: scale(1); }

/* ========== 页面过渡动画 ========== */
/* 注意：不在 body 上使用 transform，否则会破坏 position:fixed 的包含块 */
body {
    opacity: 0;
    transition: opacity 0.35s ease;
}

body.loaded {
    opacity: 1;
}

/* 页面离开过渡 */
body.page-leaving {
    opacity: 0;
    pointer-events: none;
}

/* 页面进入过渡 */
body.page-entering {
    opacity: 0;
}

/* View Transition API 支持 */
@supports (view-transition-name: none) {
    /* 旧页面退出 */
    ::view-transition-old(root) {
        animation: pageTransitionOut 0.3s ease both;
    }

    /* 新页面进入 */
    ::view-transition-new(root) {
        animation: pageTransitionIn 0.35s ease both;
    }
}

@keyframes pageTransitionOut {
    from {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    to {
        opacity: 0;
        transform: translateY(-10px) scale(0.99);
    }
}

@keyframes pageTransitionIn {
    from {
        opacity: 0;
        transform: translateY(14px) scale(0.99);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* 减少动画偏好 - 尊重用户设置 */
@media (prefers-reduced-motion: reduce) {
    body {
        transition: opacity 0.1s ease;
    }
    body.page-leaving {
        opacity: 0;
    }
    body.page-entering {
        opacity: 0;
    }
    @supports (view-transition-name: none) {
        ::view-transition-old(root),
        ::view-transition-new(root) {
            animation-duration: 0.05s;
        }
    }
}

/* 面包屑动画 */
.breadcrumb {
    opacity: 0;
    transform: translateY(-8px);
    animation: breadcrumbFadeIn 0.5s ease 0.2s forwards;
}

@keyframes breadcrumbFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 页面 Hero 标题动画增强 */
.page-hero h1 {
    opacity: 0;
    transform: translateY(16px);
    animation: heroTitleIn 0.6s ease 0.3s forwards;
}

@keyframes heroTitleIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-hero p {
    opacity: 0;
    transform: translateY(12px);
    animation: heroDescIn 0.6s ease 0.5s forwards;
}

@keyframes heroDescIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 图片加载占位效果 */
img {
    background: var(--color-bg-section);
    transition: opacity 0.3s ease;
}

img[loading="lazy"] {
    opacity: 0;
}

img[loading="lazy"].loaded,
img[loading="lazy"]:not([data-src]) {
    opacity: 1;
}

/* ========== 徽章标签 ========== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--color-text-secondary);
    box-shadow: var(--shadow-sm);
    font-weight: 500;
}

.badge-icon {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
    flex-shrink: 0;
}

/* ========== 分割线 ========== */
.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border), transparent);
    margin: 0 auto;
    width: 100%;
}

/* ========== 标签页 / Tab 切换 ========== */
.tab-bar {
    display: flex;
    gap: 4px;
    padding: 5px;
    background: var(--color-bg-section);
    border-radius: var(--radius-sm);
    margin-bottom: 28px;
    overflow-x: auto;
}

.tab-item {
    padding: 10px 22px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    border: none;
    background: transparent;
}

.tab-item:hover { color: var(--color-text); }

.tab-item.active {
    background: var(--color-bg-card);
    color: var(--color-primary);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.35s ease; }

/* ========== 工具类 ========== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.font-display { font-family: var(--font-display); }

.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mb-8 { margin-bottom: 32px; }

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 36px;
        /* 第一行：品牌 + 关注我们（二维码放右边）
           第二行：产品 + 支持 */
    }
    .footer-grid > div:nth-child(1) { grid-column: 1 / 2; }
    .footer-grid > div:nth-child(2) { grid-column: 1 / 2; order: 2; }
    .footer-grid > div:nth-child(3) { grid-column: 2 / 3; order: 3; }
    .footer-grid > div:nth-child(4) { grid-column: 2 / 3; order: 1; }
    .stats-bar { gap: 32px; padding: 36px 28px; }
    .section { padding: 72px 0; }
    .section-title { font-size: 30px; }
    /* 平板下二维码适当缩小 */
    .qr-code-box { width: 88px; height: 88px; }
}

@media (max-width: 768px) {
    .header-inner { padding: 0 16px; }
    
    .nav { display: none !important; }
    .nav-actions .theme-switcher { display: none !important; }
    .mobile-menu-btn { display: flex; }
    
    .page-hero { padding: 110px 0 54px; }
    .page-hero h1 { font-size: 30px; }
    .page-hero p { font-size: 15px; }
    
    .section { padding: 56px 0; }
    .section-header { margin-bottom: 40px; }
    .section-title { font-size: 26px; }
    .section-desc { font-size: 14px; }
    
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    
    .steps { flex-direction: column; gap: 28px; align-items: center; }
    .steps::before { display: none; }
    .step-number { width: 64px; height: 64px; font-size: 24px; }
    
    .stats-bar { flex-direction: column; gap: 24px; padding: 28px 20px; }
    .stat-value { font-size: 34px; }
    
    /* 移动端 footer 单列居中 */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
        text-align: center;
    }
    .footer-grid > div { order: unset; } /* 重置平板时的 order */
    .footer-brand p { max-width: 100%; }
    .footer-links a:hover { transform: none; } /* 移动端去掉 hover 位移动画 */
    .qr-codes { justify-content: center; gap: 28px; }
    .qr-code-box { width: 100px; height: 100px; }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 12px;
        padding-top: 20px;
    }
    .footer-legal {
        justify-content: center;
        flex-wrap: wrap;
        gap: 14px;
    }
    
    .form-row { grid-template-columns: 1fr; }
    
    .cta-title { font-size: 24px; }
    .cta-section { padding: 52px 0; }
    
    .card { padding: 24px; }
    .testimonial { padding: 24px; }
    
    .tab-bar { flex-wrap: nowrap; -webkit-overflow-scrolling: touch; }
    
    /* 悬浮按钮在移动端调整位置，避免遮挡底部内容 */
    .floating-contacts { bottom: 72px; right: 18px; }
    #backToTop { right: 16px; bottom: 18px; }
}

@media (max-width: 480px) {
    .container { padding: 0 18px; }
    .page-hero h1 { font-size: 26px; }
    .hero-text h1 { font-size: 30px !important; }
    .btn-lg { padding: 12px 24px; font-size: 14px; }
    
    /* 超小屏 footer 进一步优化 */
    .footer-grid { gap: 22px; margin-bottom: 36px; }
    .footer-brand p { font-size: 12px; line-height: 1.7; }
    .footer-title { font-size: 13px; margin-bottom: 14px; }
    .footer-links a { font-size: 13px; }
    .qr-codes { gap: 20px; }
    .qr-code-box { width: 90px; height: 90px; border-radius: var(--radius-sm); }
    .qr-code-label { font-size: 11px; }
    
    .footer-bottom { gap: 10px; padding-top: 16px; }
    .copyright { font-size: 11px; line-height: 1.5; }
    .footer-legal { gap: 10px; }
    .footer-legal a { font-size: 11px; }
    
    /* 悬浮按钮超小屏进一步收紧 */
    .floating-contacts { bottom: 64px; right: 14px; }
    #backToTop { right: 12px; bottom: 14px; width: 38px; height: 38px; }
}

/* ========== 悬浮联系方式 ========== */
.floating-contacts {
    position: fixed;
    bottom: 88px;
    right: 32px;
    z-index: 899;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

/* 触发按钮 */
.fc-trigger {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(var(--color-primary-rgb), 0.35);
    transition: all var(--transition-smooth);
    position: relative;
    outline: none;
}

.fc-trigger::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    border: 2px solid rgba(var(--color-primary-rgb), 0.25);
    animation: fc-pulse 2.5s ease-in-out infinite;
}

@keyframes fc-pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.15); opacity: 0; }
}

.fc-trigger:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(var(--color-primary-rgb), 0.45);
}

.fc-trigger.active {
    background: var(--color-primary-dark);
}

.fc-trigger svg {
    width: 22px;
    height: 22px;
    pointer-events: none;
}

/* 面板 */
.fc-panel {
    position: absolute;
    bottom: 58px;
    right: 0;
    width: 280px;
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    transform: translateY(10px) scale(0.95);
    pointer-events: none;
    transition: all var(--transition-smooth);
    overflow: hidden;
}

.fc-panel.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

/* 面板头部 */
.fc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    font-size: 14px;
    font-weight: 600;
}

.fc-close {
    width: 28px;
    height: 28px;
    border: none;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.85);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    padding: 0;
    outline: none;
}

.fc-close:hover {
    background: rgba(255, 255, 255, 0.3);
    color: #fff;
    transform: rotate(90deg);
}

/* 面板内容 */
.fc-body {
    padding: 8px;
}

/* 联系方式项 */
.fc-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-fast);
    position: relative;
}

a.fc-item:hover {
    background: var(--color-primary-bg);
}

div.fc-item-qq {
    cursor: pointer;
}

.fc-item-qq:hover {
    background: var(--color-primary-bg);
}

div.fc-item-wechat {
    cursor: pointer;
}

.fc-item-wechat:hover {
    background: var(--color-primary-bg);
}

/* 微信二维码区域 */
.fc-wechat-qr {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 14px 8px;
    border-top: 1px dashed var(--color-border);
    margin-top: 4px;
}

.fc-wechat-qr img {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    object-fit: cover;
    margin-bottom: 8px;
    background: #fff;
}

.fc-wechat-qr span {
    font-size: 11px;
    color: var(--color-text-muted);
    text-align: center;
}

/* 图标 */
.fc-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: #fff;
}

.fc-icon-email {
    background: linear-gradient(135deg, #2563EB, #60A5FA);
}

.fc-icon-qq {
    background: linear-gradient(135deg, #12B7F5, #4FC3F7);
}

.fc-icon-phone {
    background: linear-gradient(135deg, #10B981, #34D399);
}

.fc-icon-wechat {
    background: linear-gradient(135deg, #07C160, #2DC84D);
}

.fc-icon svg {
    width: 18px;
    height: 18px;
    pointer-events: none;
}

/* 信息 */
.fc-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    flex: 1;
}

.fc-label {
    font-size: 12px;
    color: var(--color-text-muted);
    font-weight: 500;
}

.fc-value {
    font-size: 13px;
    color: var(--color-text);
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 在线徽章 */
.fc-badge {
    padding: 3px 10px;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(16, 185, 129, 0.08));
    color: #10B981;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    border: 1px solid rgba(16, 185, 129, 0.2);
    white-space: nowrap;
    flex-shrink: 0;
    position: relative;
}

.fc-badge::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #10B981;
    margin-right: 4px;
    vertical-align: middle;
    animation: fc-dot-blink 1.5s ease-in-out infinite;
}

@keyframes fc-dot-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* 复制提示 */
.fc-copy-hint {
    font-size: 11px;
    color: var(--color-text-muted);
    white-space: nowrap;
    flex-shrink: 0;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.fc-item-qq:hover .fc-copy-hint {
    opacity: 1;
}

/* ========== 悬浮联系方式移动端适配 ========== */
@media (max-width: 768px) {
    .floating-contacts {
        bottom: 78px;
        right: 16px;
    }

    .fc-trigger {
        width: 44px;
        height: 44px;
    }

    .fc-trigger svg {
        width: 20px;
        height: 20px;
    }

    .fc-panel {
        width: 260px;
        bottom: 52px;
        right: -4px;
    }
}

@media (max-width: 480px) {
    .floating-contacts {
        bottom: 72px;
        right: 12px;
    }

    .fc-panel {
        width: 250px;
        right: -6px;
    }

    #backToTop{
        bottom:22px !important;
        right:12px !important;
    }
}

/* ========== 返回顶部按钮 ========== */
#backToTop {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(var(--color-primary-rgb), 0.3);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-smooth);
    z-index: 900;
    padding: 0;
}

#backToTop svg {
    width: 22px;
    height: 22px;
}

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

#backToTop:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(var(--color-primary-rgb), 0.4);
}

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--color-text-muted); }

[data-theme="dark"] ::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); }
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

/* ========== 小程序二维码弹窗 ========== */
.qr-popup {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.qr-popup.active {
    opacity: 1;
    visibility: visible;
}

.qr-popup-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.qr-popup-content {
    position: relative;
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: 40px 36px 32px;
    text-align: center;
    max-width: 340px;
    width: 90%;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-border);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s ease;
}

.qr-popup.active .qr-popup-content {
    transform: translateY(0) scale(1);
}

.qr-popup-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    padding: 4px;
    border-radius: 50%;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    line-height: 1;
}

.qr-popup-close:hover {
    color: var(--color-text);
    background: var(--color-bg-section);
}

.qr-popup-img {
    width: 200px;
    height: 200px;
    margin: 0 auto 20px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 2px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    object-fit: cover;
}

.qr-popup-title {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.qr-popup-desc {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.5;
}