/* ===== 发菜模式工坊 - 前台展示页面样式 ===== */
:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-section: #f1f5f9;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-glow: rgba(37, 99, 235, 0.2);
    --gradient-1: linear-gradient(135deg, #2563eb, #7c3aed);
    --gradient-2: linear-gradient(135deg, #0891b2, #2563eb);
    --success: #16a34a;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

/* 全局微妙的科技点阵 */
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: radial-gradient(rgba(37, 99, 235, 0.06) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}

/* 确保内容在点阵之上 */
.navbar, .hero, .section, .footer {
    position: relative;
    z-index: 1;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 64px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 48px;
    transition: border-color 0.3s;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.navbar-brand .logo-icon {
    width: 34px; height: 34px;
    background: var(--gradient-1);
    border-radius: 9px;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; font-weight: 700; color: #fff;
}

.navbar-brand span {
    font-size: 17px;
    font-weight: 700;
    color: #0f172a;
    letter-spacing: -0.01em;
}

.navbar-links {
    display: flex;
    align-items: center;
    gap: 6px;
}

.navbar-links a {
    padding: 7px 16px;
    font-size: 13px;
    color: #64748b;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
}

.navbar-links a:hover {
    color: #1e293b;
    background: rgba(37, 99, 235, 0.06);
}

.navbar-links .btn-login {
    background: var(--gradient-1);
    color: #fff;
    font-weight: 500;
    padding: 7px 22px;
    margin-left: 8px;
}

.navbar-links .btn-login:hover {
    box-shadow: 0 0 20px var(--accent-glow);
    background: var(--gradient-1);
}

/* ===== Hero 区 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(ellipse at 30% 40%, rgba(37, 99, 235, 0.04) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 60%, rgba(124, 58, 237, 0.03) 0%, transparent 60%);
}

/* 科技网格背景 */
.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(37, 99, 235, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.3) 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.3) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.12), transparent);
}

/* Hero 装饰光晕 */
.hero-glow-1, .hero-glow-2 {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    filter: blur(80px);
    opacity: 0.4;
}
.hero-glow-1 {
    width: 400px; height: 400px;
    background: rgba(37, 99, 235, 0.06);
    top: -100px; right: -100px;
    animation: glowFloat 8s ease-in-out infinite alternate;
}
.hero-glow-2 {
    width: 350px; height: 350px;
    background: rgba(124, 58, 237, 0.05);
    bottom: -80px; left: -80px;
    animation: glowFloat 10s ease-in-out infinite alternate-reverse;
}
@keyframes glowFloat {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(40px, 30px) scale(1.15); }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    color: var(--accent);
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.15);
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
}

/* 徽标扫描线动画 */
.hero-badge::after {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 60%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.08), transparent);
    animation: badgeSweep 4s ease-in-out infinite;
}
@keyframes badgeSweep {
    0%, 100% { left: -100%; }
    50% { left: 150%; }
}

.hero h1 {
    font-size: clamp(2.4rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #0f172a 0%, #475569 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero h1 .highlight {
    background: var(--gradient-1);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: #64748b;
    max-width: 600px;
    margin-bottom: 36px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-actions .btn-primary {
    padding: 14px 36px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    background: var(--gradient-1);
    color: #fff;
    text-decoration: none;
    transition: all 0.25s;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.hero-actions .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

/* 按钮扫描光效 */
.hero-actions .btn-primary::after {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 50%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transition: left 0.5s;
}
.hero-actions .btn-primary:hover::after {
    left: 150%;
}

.hero-actions .btn-secondary {
    padding: 14px 36px;
    font-size: 15px;
    font-weight: 500;
    border-radius: 12px;
    cursor: pointer;
    background: #ffffff;
    color: #475569;
    border: 1px solid #e2e8f0;
    text-decoration: none;
    transition: all 0.25s;
    font-family: inherit;
}

.hero-actions .btn-secondary:hover {
    background: #f8fafc;
    color: #1e293b;
    border-color: #cbd5e1;
}

/* ===== 通用区块 ===== */
.section {
    padding: 80px 48px;
    max-width: 1200px;
    margin: 0 auto;
}

.section-dark {
    background: var(--bg-section);
    position: relative;
}

/* section-dark 底部科技渐变线 */
.section-dark::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.08), transparent);
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-header {
    position: relative;
}
.section-header h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
    background: linear-gradient(135deg, #1e293b 0%, #2563eb 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

/* 标题下科技装饰线 */
.section-header::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 2px;
    margin: 16px auto 0;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 15px;
    max-width: 500px;
    margin: 0 auto;
}

/* ===== 功能介绍卡片 ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px 24px;
    transition: all 0.3s;
    position: relative;
    backdrop-filter: blur(4px);
}

/* 卡片顶部科技感装饰线 */
.feature-card::before {
    content: '';
    position: absolute;
    top: 0; left: 20%; right: 20%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: opacity 0.3s, left 0.3s, right 0.3s;
    border-radius: 2px;
}

.feature-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.1), 0 0 0 1px rgba(37, 99, 235, 0.05);
}

.feature-card:hover::before {
    opacity: 1;
    left: 10%;
    right: 10%;
}

.feature-icon {
    width: 48px; height: 48px;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
    margin-bottom: 16px;
    position: relative;
    backdrop-filter: blur(4px);
}

/* 图标底部科技光晕 */
.feature-icon::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 50%;
    transform: translateX(-50%);
    width: 40%; height: 3px;
    border-radius: 2px;
    background: currentColor;
    opacity: 0.2;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 优势列表 ===== */
.advantages {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.advantage-item {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    transition: all 0.25s;
    position: relative;
}

.advantage-item::before {
    content: '';
    position: absolute;
    top: 0; left: 30%; right: 30%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: all 0.3s;
    border-radius: 2px;
}

.advantage-item:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.08);
}

.advantage-item:hover::before {
    opacity: 1;
    left: 15%;
    right: 15%;
}

.advantage-icon {
    width: 44px; height: 44px;
    min-width: 44px;
    border-radius: 11px;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px;
}

.advantage-item h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
}

.advantage-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== 公告 ===== */
.announcement-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.announcement-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 18px 20px;
    transition: border-color 0.2s;
}

.announcement-item:hover { border-color: var(--accent); }

.announcement-item .date {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.announcement-item h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
}

.announcement-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 帮助列表 ===== */
.help-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 16px;
}

.help-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-decoration: none;
    color: inherit;
    transition: all 0.25s;
    position: relative;
}

.help-card::before {
    content: '';
    position: absolute;
    top: 0; left: 30%; right: 30%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: all 0.3s;
    border-radius: 2px;
}

.help-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.08);
}

.help-card:hover::before {
    opacity: 1;
    left: 15%;
    right: 15%;
}

.help-card h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
}

.help-card p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ===== 介绍内容 ===== */
.intro-content {
    max-width: 800px;
    margin: 0 auto;
}

.intro-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 28px 0 12px;
    color: var(--text-primary);
}

.intro-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

/* ===== 页脚 ===== */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 48px 32px;
    text-align: center;
    background: #ffffff;
}

.footer .brand {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
}

.footer .links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.footer .links a {
    font-size: 13px;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

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

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

.footer .copy a {
    color: var(--text-muted);
    text-decoration: none;
}

.footer .copy a:hover { color: var(--accent); }

/* ===== 帮助页独立 ===== */
.help-page {
    padding-top: 96px;
}

.help-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 32px;
    margin-top: 32px;
}

.help-sidebar {
    position: sticky;
    top: 88px;
    align-self: start;
}

.help-sidebar h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-bottom: 12px;
}

.help-sidebar a {
    display: block;
    padding: 6px 12px;
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.15s;
}

.help-sidebar a:hover, .help-sidebar a.active {
    background: rgba(59,130,246,0.08);
    color: var(--accent);
}

.help-article h1 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 20px;
}

.help-article .content {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.help-article .content p { margin-bottom: 12px; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .navbar { padding: 0 16px; }
    .navbar-links a:not(.btn-login) { display: none; }
    .section { padding: 48px 16px; }
    .features-grid { grid-template-columns: 1fr; }
    .advantages { grid-template-columns: 1fr; }
    .help-layout { grid-template-columns: 1fr; }
    .help-sidebar { display: none; }
    .footer { padding: 32px 16px; }
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }

/* ===== 页脚增强 ===== */
.footer .desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 14px;
    line-height: 1.6;
}

.footer .contact {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
    padding: 8px 16px;
    background: rgba(37, 99, 235, 0.04);
    border-radius: 8px;
    display: inline-block;
    border: 1px solid rgba(37, 99, 235, 0.08);
}

/* ===== 汉堡菜单 ===== */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 36px; height: 36px;
    border: none;
    background: rgba(0,0,0,0.03);
    border-radius: 8px;
    cursor: pointer;
    padding: 6px;
    z-index: 1001;
    transition: background 0.2s;
}
.hamburger:hover { background: rgba(0,0,0,0.06); }
.hamburger span {
    display: block;
    width: 20px; height: 2px;
    background: #475569;
    border-radius: 2px;
    transition: all 0.3s;
    margin: 2px 0;
}
.hamburger.active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ===== 导航栏公告跑马灯 ===== */
.nav-ann {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    margin: 0 8px;
}
.nav-ann-label {
    flex-shrink: 0;
    font-size: 12px;
    font-weight: 700;
    color: #fff;
    background: var(--gradient-1);
    padding: 2px 9px;
    border-radius: 4px;
    letter-spacing: 0.5px;
    line-height: 1.5;
}
.nav-ann-viewport {
    overflow: hidden;
    position: relative;
    flex: 1;
}
.nav-ann-track {
    display: flex;
    gap: 48px;
    width: max-content;
    animation: navAnn 20s linear infinite;
    will-change: transform;
}
.nav-ann-track:hover { animation-play-state: paused; }
@keyframes navAnn {
    0% { transform: translateX(100vw); }
    100% { transform: translateX(-50%); }
}
.nav-ann-item {
    font-size: 12px;
    color: var(--text-muted);
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}
.nav-ann-item:hover { color: var(--accent); }
.ann-seq {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 16px;
    height: 16px;
    font-size: 10px;
    font-weight: 700;
    color: #fff;
    background: var(--accent);
    border-radius: 3px;
    padding: 0 4px;
    line-height: 1;
}
.ann-date {
    font-size: 11px;
    color: var(--text-muted);
    opacity: 0.7;
}

@media (max-width: 768px) {
    .nav-ann { display: none; }
}

/* ===== 移动端菜单覆盖层 ===== */
.mobile-overlay {
    display: none;
    position: fixed;
    top: 64px; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 999;
    flex-direction: column;
    align-items: center;
    padding: 24px;
    gap: 4px;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.mobile-overlay.open { transform: translateX(0); }
.mobile-overlay a {
    display: block;
    width: 100%;
    max-width: 300px;
    padding: 14px 20px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 10px;
    text-align: center;
    transition: all 0.2s;
}
.mobile-overlay a:hover { background: rgba(37, 99, 235, 0.06); color: var(--accent); }
.mobile-overlay a:last-child {
    margin-top: 16px;
    background: var(--gradient-1);
    color: #fff;
    font-weight: 600;
}
.mobile-overlay a:last-child:hover {
    box-shadow: 0 0 20px var(--accent-glow);
}
.no-scroll { overflow: hidden; }

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 32px; right: 32px;
    width: 44px; height: 44px;
    border-radius: 12px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    transition: all 0.3s;
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.back-to-top.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
.back-to-top:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 4px 16px rgba(37,99,235,0.12);
    transform: translateY(-2px);
}
.back-to-top.show:hover { transform: translateY(-2px); }

/* ===== 滚动动画 (reveal) ===== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}
/* 逐项延迟 */
.reveal-delay-1 { transition-delay: 0.05s; }
.reveal-delay-2 { transition-delay: 0.1s; }
.reveal-delay-3 { transition-delay: 0.15s; }
.reveal-delay-4 { transition-delay: 0.2s; }
.reveal-delay-5 { transition-delay: 0.25s; }
.reveal-delay-6 { transition-delay: 0.3s; }

/* ===== 受众卡片统一样式 ===== */
.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}
.audience-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px 28px;
    text-align: center;
    transition: all 0.3s;
    position: relative;
}
.audience-card::before {
    content: '';
    position: absolute;
    top: 0; left: 20%; right: 20%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: all 0.3s;
    border-radius: 2px;
}
.audience-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.1);
}
.audience-card:hover::before { opacity: 1; left: 10%; right: 10%; }
.audience-card .icon {
    width: 56px; height: 56px;
    border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    font-size: 28px;
    margin: 0 auto 16px;
}
.audience-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}
.audience-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== 帮助搜索 ===== */
.help-search-wrap {
    max-width: 400px;
    margin: -24px auto 40px;
    position: relative;
}
.help-search-wrap input {
    width: 100%;
    padding: 12px 16px 12px 40px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 14px;
    font-family: inherit;
    background: var(--bg-card);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.25s, box-shadow 0.25s;
}
.help-search-wrap input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}
.help-search-wrap input::placeholder { color: var(--text-muted); }
.help-search-icon {
    position: absolute;
    left: 14px; top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
    font-size: 16px;
}

/* ===== 响应式补完 ===== */
@media (max-width: 768px) {
    .hamburger { display: flex; }
    .mobile-overlay { display: flex; }
    .back-to-top { bottom: 20px; right: 20px; width: 40px; height: 40px; }
    .audience-grid { grid-template-columns: 1fr; }
    .help-search-wrap { max-width: 100%; }
}

@media (max-width: 480px) {
    .back-to-top { bottom: 16px; right: 16px; width: 36px; height: 36px; }
}