/* ============================================
   Clash 官网 - 常见问题页样式表
   版本: v2.4.0-release
   ============================================ */

/* ---------- CSS 自定义属性 ---------- */
:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --primary-light: #eff6ff;
    --primary-border: #bfdbfe;
    --primary-soft: #dbeafe;
    --text-dark: #1e293b;
    --text-body: #334155;
    --text-muted: #64748b;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --warning-bg: #fffbeb;
    --warning-border: #fde68a;
    --warning-text: #92400e;
    --warning-dark: #78350f;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
    --shadow-primary: 0 4px 14px rgba(59, 130, 246, 0.25);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 50px;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    --max-width: 1100px;
}

/* ---------- 全局重置 ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    color: var(--text-dark);
    line-height: 1.7;
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul {
    list-style: none;
}

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

code {
    font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
    background-color: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.88em;
    color: #0f172a;
}

/* ---------- 头部导航 (与首页完全一致) ---------- */
header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 24px;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.3px;
}

.logo-area img {
    width: 34px;
    height: 34px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

nav {
    display: flex;
    align-items: center;
    gap: 22px;
}

nav a {
    text-decoration: none;
    color: #475569;
    font-size: 0.93rem;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

nav a.active {
    color: var(--primary-color);
    font-weight: 600;
    background-color: var(--primary-light);
    padding: 7px 14px;
    border-radius: var(--radius-sm);
}

.repo-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: #1e293b;
    color: #ffffff !important;
    padding: 9px 18px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.repo-btn:hover {
    background-color: #0f172a;
    color: #ffffff !important;
    transform: translateY(-1px);
}

/* ---------- FAQ Hero ---------- */
.faq-hero {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    padding: 60px 20px 30px;
}

.faq-hero .badge {
    display: inline-block;
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 7px 18px;
    border-radius: var(--radius-xl);
    font-size: 0.88rem;
    font-weight: 600;
    border: 1px solid var(--primary-border);
    margin-bottom: 22px;
    letter-spacing: 0.2px;
}

.faq-hero h1 {
    font-size: 2.3rem;
    color: #0f172a;
    line-height: 1.35;
    margin-bottom: 18px;
    letter-spacing: -0.5px;
    font-weight: 800;
}

.faq-hero p {
    font-size: 1.05rem;
    color: #475569;
    max-width: 780px;
    margin: 0 auto;
    text-align: justify;
    text-indent: 2em;
    line-height: 1.75;
}

/* ---------- 问题分类快速导航 ---------- */
.category-nav {
    max-width: 900px;
    margin: 0 auto 30px;
    padding: 0 20px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.category-title {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.95rem;
    white-space: nowrap;
}

.category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.88rem;
    color: var(--text-muted);
    font-weight: 500;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.tag:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: var(--primary-light);
}

/* ---------- 热门问题速查卡片 ---------- */
.hot-issues {
    max-width: 900px;
    margin: 0 auto 40px;
    padding: 0 20px;
}

.hot-issues h3 {
    font-size: 1.2rem;
    color: #0f172a;
    margin-bottom: 16px;
    font-weight: 600;
}

.hot-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}

.hot-card {
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px 14px;
    text-align: center;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.hot-card:hover {
    border-color: var(--primary-border);
    box-shadow: var(--shadow-sm);
}

.hot-icon {
    font-size: 1.3rem;
    display: block;
    margin-bottom: 6px;
}

.hot-card p {
    font-size: 0.9rem;
    color: var(--text-body);
    margin-bottom: 6px;
    text-indent: 0;
    text-align: center;
    font-weight: 500;
}

.hot-card a {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
}

.hot-card a:hover {
    text-decoration: underline;
}

/* ---------- 自助排查三步走 ---------- */
.troubleshoot-guide {
    max-width: 900px;
    margin: 0 auto 40px;
    padding: 20px 24px;
    background-color: var(--primary-light);
    border: 1px solid var(--primary-border);
    border-radius: var(--radius-md);
}

.troubleshoot-guide h3 {
    font-size: 1.15rem;
    color: #0f172a;
    margin-bottom: 18px;
    font-weight: 600;
}

.troubleshoot-steps {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

.t-step {
    flex: 1;
    min-width: 200px;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.t-step-num {
    width: 34px;
    height: 34px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.t-step-content strong {
    display: block;
    font-size: 0.95rem;
    color: #0f172a;
    margin-bottom: 4px;
    font-weight: 600;
}

.t-step-content p {
    font-size: 0.85rem;
    color: #475569;
    text-indent: 0;
    margin-bottom: 0;
}

/* ---------- FAQ 列表容器 ---------- */
.faq-container {
    max-width: 900px;
    margin: 0 auto 60px;
    padding: 0 20px;
}

.section-category {
    font-size: 1.35rem;
    color: #0f172a;
    margin: 36px 0 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border-light);
    font-weight: 700;
}

/* ---------- FAQ 单项 ---------- */
.faq-item {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    overflow: hidden;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--primary-border);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    padding: 20px 24px;
    background-color: var(--bg-light);
    font-size: 1.05rem;
    font-weight: 600;
    color: #0f172a;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
    cursor: default;
}

.q-badge {
    background-color: var(--primary-color);
    color: #ffffff;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    flex-shrink: 0;
    margin-top: 2px;
    line-height: 1.4;
}

.faq-answer {
    padding: 22px 24px;
    font-size: 0.98rem;
    color: var(--text-body);
    background-color: #ffffff;
}

.faq-answer p {
    margin-bottom: 12px;
    text-align: justify;
    text-indent: 2em;
    line-height: 1.7;
}

.faq-answer p:last-child {
    margin-bottom: 0;
}

.faq-answer ul {
    padding-left: 24px;
    margin-bottom: 12px;
    list-style: disc;
}

.faq-answer ul li {
    margin-bottom: 6px;
    font-size: 0.96rem;
    color: var(--text-body);
    text-indent: 0;
}

.faq-answer code {
    background-color: #f1f5f9;
    color: #0f172a;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.92em;
    word-break: break-all;
}

/* ---------- 页脚 (与首页一致) ---------- */
footer {
    background-color: #0f172a;
    color: #94a3b8;
    padding: 55px 20px 30px;
    margin-top: 50px;
    font-size: 0.9rem;
}

.footer-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 36px;
    border-bottom: 1px solid #334155;
    padding-bottom: 40px;
}

.footer-col h5 {
    color: #ffffff;
    font-size: 1rem;
    margin-bottom: 18px;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.footer-col ul li {
    margin-bottom: 11px;
}

.footer-col ul li a {
    color: #94a3b8;
    text-decoration: none;
    transition: color var(--transition-fast);
    font-size: 0.9rem;
}

.footer-col ul li a:hover {
    color: #ffffff;
}

.footer-bottom {
    max-width: 1000px;
    margin: 28px auto 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    font-size: 0.84rem;
}

.footer-bottom p {
    margin-bottom: 0;
    text-indent: 0;
    color: #64748b;
}

/* ---------- 响应式设计 ---------- */
@media (max-width: 1024px) {
    .hot-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 14px;
        padding: 12px 16px;
    }

    nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px;
    }

    nav a {
        font-size: 0.88rem;
    }

    .repo-btn {
        padding: 7px 14px;
        font-size: 0.84rem;
    }

    .faq-hero h1 {
        font-size: 1.8rem;
    }

    .faq-hero p {
        font-size: 0.96rem;
        text-indent: 1.5em;
    }

    .category-nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .hot-cards {
        grid-template-columns: 1fr;
    }

    .troubleshoot-steps {
        flex-direction: column;
    }

    .section-category {
        font-size: 1.2rem;
    }

    .faq-question {
        font-size: 0.98rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .faq-hero h1 {
        font-size: 1.55rem;
    }

    .faq-hero .badge {
        font-size: 0.8rem;
    }

    .tag {
        padding: 5px 12px;
        font-size: 0.82rem;
    }

    .faq-question {
        padding: 16px 18px;
    }

    .faq-answer {
        padding: 16px 18px;
    }
}

/* ---------- 打印样式 ---------- */
@media print {
    header,
    footer,
    .category-nav,
    .hot-issues,
    .troubleshoot-guide {
        display: none;
    }

    body {
        color: #000;
        background: #fff;
    }

    .faq-container {
        max-width: 100%;
    }

    .faq-item {
        break-inside: avoid;
        border: 1px solid #ccc;
    }
}