/* ========================================
   QuickQ 主样式表
   设计原则：干净、现代、高可读性
   ======================================== */

/* --- CSS 变量 --- */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #0f172a;
    --accent: #06b6d4;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --bg-dark: #0f172a;
    --text: #1e293b;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.08);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.25s ease;
    --max-width: 1200px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

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

/* --- 导航栏 --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
}

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

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 36px;
    width: auto;
    display: block;
}

.logo-icon { font-size: 1.6rem; }
.logo-text { font-size: 1.4rem; font-weight: 700; color: var(--secondary); }

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-links a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition);
}
.nav-links a:visited {
    color: var(--text);
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: #eff6ff;
}

.nav-cta {
    padding: 8px 20px;
    font-size: 0.9rem;
}

/* --- 按钮 --- */
.btn-primary {
    display: inline-block;
    background: var(--primary);
    color: #fff !important;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    display: inline-block;
    background: var(--bg);
    color: var(--primary) !important;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    border: 1.5px solid var(--primary);
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}
.btn-secondary:hover {
    background: #eff6ff;
}

.btn-lg {
    padding: 14px 36px;
    font-size: 1.05rem;
    border-radius: var(--radius);
}

.btn-link {
    color: var(--text-light) !important;
    font-size: 0.9rem;
    font-weight: 500;
}
.btn-link:hover { color: var(--primary) !important; }

/* --- Hero --- */
.hero {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 50%, #e0f2fe 100%);
    padding: 80px 24px 72px;
}

.hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
}

.hero-left {
    flex: 1;
    max-width: 560px;
}

.hero-right {
    flex-shrink: 0;
}

.hero-right img {
    width: 520px;
    height: auto;
    display: block;
    border-radius: 16px;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--secondary);
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.85;
    margin-bottom: 28px;
}

.hero-media-row {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 28px;
}

.btn-video {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: #e91e63;
    color: #fff !important;
    font-size: 0.88rem;
    font-weight: 500;
    justify-content: center;
    transition: all var(--transition);
}
.btn-video:hover { background: #c2185b; transform: scale(1.08); }

.play-icon { font-size: 0.75rem; margin-left: -2px; }

.intro-link {
    color: var(--text-light) !important;
    font-size: 1rem;
    font-weight: 400;
    cursor: pointer;
}
.intro-link:hover { color: var(--primary) !important; }

.btn-pink {
    background: linear-gradient(135deg, #ec4899, #db2777) !important;
    border-color: transparent !important;
}
.btn-pink:hover {
    background: linear-gradient(135deg, #db2777, #be185d) !important;
}

.hero-actions {
    margin-bottom: 32px;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.hero-tag {
    background: rgba(255,255,255,0.7);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.86rem;
    color: var(--text-light);
}

/* --- Page Hero (内部页面) --- */
.page-hero {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    padding: 64px 24px 48px;
    text-align: center;
}

.page-hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--secondary);
    margin-bottom: 12px;
}

.page-intro {
    max-width: 720px;
    margin: 16px auto 0;
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.8;
}

/* --- Section 通用 --- */
section {
    padding: 72px 24px;
}

section h2 {
    text-align: center;
    font-size: 1.9rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 12px;
}

.section-desc {
    text-align: center;
    color: var(--text-light);
    font-size: 1.05rem;
    max-width: 560px;
    margin: 0 auto 48px;
}

/* --- Feature Grid (首页) --- */
.feature-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 28px;
}

.feature-card {
    background: var(--bg);
    padding: 32px 28px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

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

.feature-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--secondary);
}

.feature-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* --- Core Features --- */
.core-features {
    background: var(--bg-alt);
}

.core-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.core-card {
    background: var(--bg);
    padding: 32px 28px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.core-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--secondary);
}

.core-card > p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 16px;
    line-height: 1.7;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: 5px 0 5px 20px;
    position: relative;
    color: var(--text-light);
    font-size: 0.9rem;
}
.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

/* --- Target Users --- */
.user-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.user-card {
    padding: 28px 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all var(--transition);
    text-align: center;
}
.user-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.user-icon { font-size: 2.4rem; margin-bottom: 12px; }

.user-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--secondary);
}

.user-card p {
    color: var(--text-light);
    font-size: 0.92rem;
    line-height: 1.7;
}

/* --- FAQ --- */
.faq-section {
    background: var(--bg-alt);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.faq-item summary {
    padding: 18px 24px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    color: var(--secondary);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: "+";
    font-size: 1.4rem;
    color: var(--primary);
    font-weight: 300;
    transition: transform var(--transition);
}
.faq-item[open] summary::after {
    content: "−";
}

.faq-item summary h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
    text-align: left;
    color: var(--secondary);
}

.faq-answer {
    padding: 0 24px 20px;
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.75;
}
.faq-answer a { font-weight: 500; }

/* --- CTA --- */
.cta-section {
    text-align: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    padding: 64px 24px;
}

.cta-section h2 {
    color: #fff;
    font-size: 2rem;
    margin-bottom: 8px;
}

.cta-section p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 28px;
}

.cta-section .btn-primary {
    background: #fff;
    color: var(--primary) !important;
    font-size: 1.1rem;
}
.cta-section .btn-primary:hover {
    background: #f0f6ff;
}

/* --- 优势详情页 --- */
.advantages-detail {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 48px 24px;
}

.advantage-block {
    margin-bottom: 56px;
    padding: 40px;
    background: var(--bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.advantage-block h2 {
    text-align: left;
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.adv-subtitle {
    color: var(--text-light);
    font-size: 1rem;
    margin-bottom: 28px;
    line-height: 1.7;
}

/* Region Grid */
.region-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.region-item {
    background: var(--bg-alt);
    padding: 20px;
    border-radius: var(--radius-sm);
}

.region-item h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--primary);
}

.region-item p {
    font-size: 0.88rem;
    color: var(--text-light);
}

/* Feature Points */
.feature-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.point {
    padding: 20px;
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
}

.point strong {
    display: block;
    font-size: 0.95rem;
    color: var(--secondary);
    margin-bottom: 6px;
}

.point p {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* Security Specs */
.security-specs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.spec-item {
    padding: 20px;
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
    text-align: center;
}

.spec-item h4 {
    font-size: 0.95rem;
    color: var(--primary);
    margin-bottom: 6px;
}

.spec-item p {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* Platform Grid */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
}

.platform-item {
    padding: 24px 16px;
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
    text-align: center;
    transition: transform var(--transition);
}
.platform-item:hover { transform: translateY(-2px); }

.platform-item h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--secondary);
}

.platform-item p {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* Value Cards */
.value-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.value-card {
    padding: 28px 24px;
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
    text-align: center;
}

.value-card h4 {
    font-size: 1.05rem;
    margin-bottom: 8px;
    color: var(--secondary);
}

.value-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* --- 下载页 --- */
.download-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 48px 24px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

.download-card {
    padding: 36px 28px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    text-align: center;
    transition: all var(--transition);
}
.download-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: #bfdbfe;
}

.download-icon {
    font-size: 2.6rem;
    margin-bottom: 16px;
}

.download-card h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--secondary);
}

.download-card > p {
    color: var(--text-light);
    font-size: 0.92rem;
    margin-bottom: 24px;
    line-height: 1.6;
}

.download-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.download-actions .btn-primary,
.download-actions .btn-secondary {
    width: 100%;
    padding: 12px 20px;
}

.version-info {
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* --- 教程页 --- */
.tutorial-nav {
    padding: 48px 24px;
}

.tutorial-cards {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 20px;
}

.tutorial-card {
    display: block;
    padding: 28px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text) !important;
    transition: all var(--transition);
}
.tutorial-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.tut-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 12px;
}

.tutorial-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--secondary);
}

.tutorial-card p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Latest Articles */
.latest-articles {
    background: var(--bg-alt);
    padding: 48px 24px;
}

.latest-articles h2 {
    margin-bottom: 32px;
}

.article-list {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.article-item {
    padding: 20px 24px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.article-item time {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.article-item h3 {
    margin: 6px 0;
    font-size: 1.05rem;
}

.article-item h3 a {
    color: var(--secondary);
}
.article-item h3 a:hover { color: var(--primary); }

.article-item > p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* --- Breadcrumb --- */
.breadcrumb {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

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

/* --- 文章详情页 --- */
.article-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 48px 24px;
}

.article-header {
    margin-bottom: 36px;
}

.article-header h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--secondary);
    line-height: 1.35;
    margin-bottom: 12px;
}

.article-meta {
    font-size: 0.88rem;
    color: var(--text-muted);
    display: flex;
    gap: 16px;
}

.article-content h2 {
    text-align: left;
    font-size: 1.35rem;
    margin: 36px 0 14px;
    color: var(--secondary);
}

.article-content h3 {
    font-size: 1.1rem;
    margin: 24px 0 10px;
    color: var(--secondary);
}

.article-content p {
    margin-bottom: 14px;
    color: var(--text);
    line-height: 1.85;
}

.article-content ul,
.article-content ol {
    margin: 12px 0 20px 20px;
    color: var(--text);
}

.article-content li {
    margin-bottom: 6px;
    line-height: 1.7;
}

.article-content strong {
    color: var(--secondary);
}

/* Article Nav */
.article-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.nav-prev, .nav-next {
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-prev.disabled {
    color: var(--text-muted);
    cursor: default;
}

/* --- Footer --- */
.site-footer {
    background: var(--bg-dark);
    color: #cbd5e1;
    padding: 56px 24px 28px;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 8px;
}

.footer-col a {
    color: #94a3b8;
    font-size: 0.9rem;
    transition: color var(--transition);
}
.footer-col a:hover { color: #fff; }

.footer-bottom {
    max-width: var(--max-width);
    margin: 0 auto;
    padding-top: 24px;
    border-top: 1px solid #334155;
    text-align: center;
    font-size: 0.85rem;
    color: #64748b;
}

.footer-bottom a {
    color: #94a3b8;
}
.footer-bottom a:hover { color: #fff; }

/* --- 响应式 --- */
@media (max-width: 768px) {
    .hero { padding: 56px 16px 48px; }
    .hero h1 { font-size: 1.9rem; }
    .hero-subtitle { font-size: 0.92rem; }

    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    .hero-left {
        max-width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    .hero-media-row { justify-content: center; }
    .hero-features { justify-content: center; }
    .hero-right img {
        width: 100%;
        max-width: 380px;
        margin-top: 24px;
    }
    
    .page-hero h1 { font-size: 1.6rem; }
    
    .nav-links { display: none; }
    
    section { padding: 48px 16px; }
    section h2 { font-size: 1.4rem; }
    
    .feature-grid,
    .core-grid,
    .user-grid,
    .download-grid,
    .tutorial-cards {
        grid-template-columns: 1fr;
    }
    
    .hero-features { gap: 8px; }
    .hero-tag { font-size: 0.8rem; padding: 4px 12px; }
    
    .advantage-block { padding: 24px 20px; }
    .advantage-block h2 { font-size: 1.25rem; }
    
    .article-header h1 { font-size: 1.5rem; }
    .article-content h2 { font-size: 1.15rem; }
    
    .footer-content { grid-template-columns: 1fr 1fr; gap: 28px; }
}