/* ================================================================
   NOVA Studio - 全局样式（简洁白色风格）
   ================================================================ */

/* ===== CSS 变量 ===== */
:root {
    --c-primary: #4f46e5;
    --c-primary-dark: #4338ca;
    --c-primary-light: #e0e7ff;
    --c-accent: #f43f5e;
    --c-accent-2: #06b6d4;
    --c-dark: #111827;
    --c-dark-2: #1f2937;
    --c-gray: #6b7280;
    --c-gray-light: #9ca3af;
    --c-bg: #ffffff;
    --c-bg-alt: #f9fafb;
    --c-bg-card: #ffffff;
    --c-white: #ffffff;
    --c-text: #1f2937;
    --c-text-light: #6b7280;
    --c-border: #e5e7eb;
    --c-border-light: #f3f4f6;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);

    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --container: 1140px;
    --transition: .25s ease;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-sans);
    background: var(--c-bg);
    color: var(--c-text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ===== 布局 ===== */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.main-content { min-height: 60vh; }

/* ===== 导航栏 ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
}
.navbar.scrolled {
    border-bottom-color: var(--c-border);
    box-shadow: var(--shadow-sm);
    padding: 12px 0;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.2rem; color: var(--c-dark); }
.logo-mark {
    width: 36px; height: 36px; border-radius: 10px;
    background: var(--c-primary); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; font-weight: 800;
}
.logo-text { font-size: 1.1rem; font-weight: 700; color: var(--c-dark); }
.logo-mark img { background: transparent; }
.nav-logo, .nav-link { color: var(--c-dark); }

.nav-menu { display: flex; align-items: center; }

/* ===== 桌面端导航样式（≥641px） ===== */
@media (min-width: 641px) {
    .nav-menu-items { display: flex; align-items: center; gap: 32px; flex-direction: row; }
    .nav-menu-items .nav-link { color: var(--c-gray); font-size: .9rem; padding: 0; border-radius: 0; overflow: visible; transition: color .25s ease; position: relative; }
    .nav-menu-items .nav-link::after {
        content: '';
        position: absolute;
        bottom: -6px;
        left: 50%;
        width: 0;
        height: 2px;
        background: var(--c-primary);
        border-radius: 2px;
        transform: translateX(-50%);
        transition: width .3s ease;
    }
    .nav-menu-items .nav-link:hover::after { width: 100%; }
    .nav-menu-items .nav-link.active::after { width: 100%; }
    .nav-menu-items .nav-link:hover, .nav-menu-items .nav-link.active { color: var(--c-primary); background: transparent; }
    .nav-menu-items .nav-cta::after { display: none; }
    .nav-menu-items .nav-cta {
        background: var(--c-primary) !important; color: #fff !important;
        padding: 9px 22px; border-radius: 8px; font-weight: 600;
        transition: var(--transition);
    }
    .nav-menu-items .nav-cta:hover { background: var(--c-primary-dark); color: #fff !important; transform: none; }
    .nav-menu-items .nav-link.nav-cta { box-shadow: none; margin-top: 0; justify-content: center; }
    .nav-icon { display: none; }
}
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span {
    width: 22px; height: 2px; background: var(--c-dark); border-radius: 2px;
    transition: var(--transition);
}

/* ===== 通用按钮 ===== */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 28px; border-radius: 8px;
    font-weight: 600; font-size: .9rem;
    transition: var(--transition); cursor: pointer;
}
.btn-primary {
    background: var(--c-primary); color: #fff;
}
.btn-primary:hover { background: var(--c-primary-dark); transform: translateY(-1px); }
.btn-outline {
    background: transparent; color: var(--c-primary);
    border: 1.5px solid var(--c-border);
}
.btn-outline:hover { border-color: var(--c-primary); background: var(--c-primary-light); }
.btn-dark {
    background: var(--c-dark); color: #fff;
}
.btn-dark:hover { background: var(--c-dark-2); transform: translateY(-1px); }
.btn-white {
    background: #fff; color: var(--c-dark);
}
.btn-white:hover { background: var(--c-bg-alt); transform: translateY(-1px); }
.btn-lg { padding: 14px 32px; font-size: 1rem; }

/* ===== 区段通用 ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--c-bg-alt); }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
    display: inline-block; padding: 5px 14px; border-radius: 6px;
    background: var(--c-primary-light); color: var(--c-primary);
    font-size: .8rem; font-weight: 600;
    margin-bottom: 16px;
}
.section-title {
    font-size: 2.2rem; font-weight: 700; color: var(--c-dark);
    margin-bottom: 14px; line-height: 1.35; letter-spacing: -0.5px;
}
.section-subtitle { font-size: 1.05rem; color: var(--c-text-light); max-width: 560px; margin: 0 auto; }

/* ===== Hero 区 ===== */
.hero {
    min-height: 90vh; display: flex; align-items: center;
    background: var(--c-bg); position: relative; overflow: hidden;
    padding-top: 100px; padding-bottom: 60px;
    border-bottom: 1px solid var(--c-border-light);
}
.hero-content { position: relative; z-index: 2; color: var(--c-text); max-width: 680px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 7px 16px; border-radius: 20px;
    background: var(--c-primary-light); color: var(--c-primary);
    font-size: .82rem; font-weight: 600; margin-bottom: 24px;
    border: 1px solid #c7d2fe;
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c-primary); }
.hero-title {
    font-size: 3.5rem; font-weight: 800; line-height: 1.2;
    margin-bottom: 24px; color: var(--c-dark); letter-spacing: -1px;
}
.hero-title .accent { color: var(--c-primary); }
.hero-desc {
    font-size: 1.15rem; color: var(--c-text-light);
    max-width: 520px; margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
    display: flex; gap: 48px; margin-top: 60px;
    padding-top: 40px; border-top: 1px solid var(--c-border-light);
}
.hero-stat .num { font-size: 2.2rem; font-weight: 800; color: var(--c-dark); }
.hero-stat .label { font-size: .88rem; color: var(--c-text-light); }

/* ===== 服务卡片 ===== */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.service-card {
    background: var(--c-bg-card); border-radius: var(--radius-lg);
    padding: 36px 30px; border: 1px solid var(--c-border);
    transition: var(--transition);
    position: relative;
}
.service-card:hover { border-color: var(--c-primary); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.service-icon {
    width: 52px; height: 52px; border-radius: 12px;
    background: var(--c-primary-light); color: var(--c-primary);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px; transition: var(--transition);
}
.service-card:hover .service-icon { background: var(--c-primary); color: #fff; }
.service-icon svg { width: 26px; height: 26px; }
.service-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; color: var(--c-dark); }
.service-card p { color: var(--c-text-light); font-size: .92rem; line-height: 1.65; }

/* ===== 作品集 ===== */
.portfolio-filter {
    display: flex; justify-content: center; gap: 8px; flex-wrap: wrap;
    margin-bottom: 40px;
}
.filter-btn {
    padding: 8px 20px; border-radius: 8px;
    background: var(--c-bg); color: var(--c-text-light);
    font-weight: 500; font-size: .88rem; border: 1px solid var(--c-border);
    transition: var(--transition);
}
.filter-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.filter-btn.active {
    background: var(--c-dark); color: #fff; border-color: var(--c-dark);
}
.portfolio-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.portfolio-item {
    border-radius: var(--radius-lg); overflow: hidden; position: relative;
    aspect-ratio: 4/3; cursor: pointer; border: 1px solid var(--c-border);
    transition: var(--transition);
}
.portfolio-item:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.portfolio-cover {
    position: absolute; inset: 0; display: flex;
    align-items: center; justify-content: center; color: rgba(255,255,255,.5);
    font-size: 2.5rem; font-weight: 800; transition: var(--transition);
}
.portfolio-overlay {
    position: absolute; inset: 0; background: linear-gradient(to top, rgba(17,24,39,.92) 0%, transparent 65%);
    display: flex; flex-direction: column; justify-content: flex-end;
    padding: 24px; opacity: 0; transition: var(--transition);
}
.portfolio-item:hover .portfolio-overlay { opacity: 1; }
.portfolio-overlay .cat {
    font-size: .78rem; color: #a5b4fc; font-weight: 600;
    margin-bottom: 6px;
}
.portfolio-overlay h3 { color: #fff; font-size: 1.15rem; margin-bottom: 8px; }
.portfolio-overlay .tags { display: flex; gap: 6px; flex-wrap: wrap; }
.portfolio-overlay .tag {
    font-size: .72rem; padding: 3px 10px; border-radius: 6px;
    background: rgba(255,255,255,.15); color: rgba(255,255,255,.85);
}
.portfolio-empty { grid-column: 1/-1; text-align: center; padding: 60px; color: var(--c-text-light); }

/* ===== 数据统计 ===== */
.stats-section {
    background: var(--c-dark); color: #fff;
    position: relative; overflow: hidden;
}
.stats-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px;
    position: relative; z-index: 2;
}
.stat-item { text-align: center; padding: 20px; }
.stat-num { font-size: 2.8rem; font-weight: 800; margin-bottom: 8px; color: #fff; }
.stat-num .suffix { font-size: 1.4rem; }
.stat-label { color: rgba(255,255,255,.6); font-size: .95rem; }

/* ===== 关于我们 ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-visual {
    border-radius: var(--radius-xl); overflow: hidden;
    aspect-ratio: 1; position: relative;
    background: var(--c-primary);
    box-shadow: var(--shadow-md);
}
.about-visual-pattern {
    position: absolute; inset: 0; opacity: .15;
    background-image: radial-gradient(circle at 20% 30%, #fff 2px, transparent 2px),
                      radial-gradient(circle at 60% 70%, #fff 3px, transparent 3px);
    background-size: 40px 40px, 60px 60px;
}
.about-visual-content {
    position: absolute; inset: 0; display: flex; flex-direction: column;
    align-items: center; justify-content: center; color: #fff; text-align: center; padding: 40px;
}
.about-visual-content .big-num { font-size: 4.5rem; font-weight: 800; }
.about-visual-content .desc { font-size: 1.1rem; opacity: .85; }
.about-text h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 20px; color: var(--c-dark); letter-spacing: -0.5px; }
.about-text p { color: var(--c-text-light); margin-bottom: 16px; font-size: 1.02rem; }
.about-features { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
.about-feature { display: flex; align-items: flex-start; gap: 10px; }
.about-feature .check {
    width: 24px; height: 24px; border-radius: 6px; flex-shrink: 0;
    background: var(--c-primary-light); color: var(--c-primary);
    display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: .85rem;
}
.about-feature span { font-weight: 500; color: var(--c-dark); font-size: .95rem; }

/* ===== 团队 ===== */
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.team-card {
    text-align: center; background: var(--c-bg-card);
    border-radius: var(--radius-lg); padding: 32px 20px;
    border: 1px solid var(--c-border); transition: var(--transition);
}
.team-card:hover { border-color: var(--c-primary); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.team-avatar {
    width: 88px; height: 88px; border-radius: 50%; margin: 0 auto 18px;
    background: var(--c-primary); display: flex; align-items: center; justify-content: center;
    font-size: 1.8rem; font-weight: 700; color: #fff;
}
.team-card h3 { font-size: 1.1rem; font-weight: 700; color: var(--c-dark); margin-bottom: 4px; }
.team-role { color: var(--c-primary); font-size: .85rem; font-weight: 600; margin-bottom: 10px; }
.team-bio { color: var(--c-text-light); font-size: .88rem; }

/* ===== 客户评价 ===== */
.testimonials-section { background: var(--c-bg-alt); color: var(--c-text); }
.testimonials-section .section-title { color: var(--c-dark); }
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; position: relative; z-index: 2; }
.testimonial-card {
    background: var(--c-bg-card); border: 1px solid var(--c-border);
    border-radius: var(--radius-lg); padding: 32px 26px; transition: var(--transition);
}
.testimonial-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.testimonial-quote { font-size: 2.5rem; color: var(--c-primary-light); line-height: 1; margin-bottom: 12px; font-family: Georgia, serif; }
.testimonial-text { color: var(--c-text); font-size: .98rem; margin-bottom: 20px; line-height: 1.7; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar {
    width: 44px; height: 44px; border-radius: 50%;
    background: var(--c-dark); display: flex; align-items: center; justify-content: center;
    font-weight: 700; color: #fff; font-size: .9rem;
}
.testimonial-name { font-weight: 600; color: var(--c-dark); font-size: .95rem; }
.testimonial-role { font-size: .82rem; color: var(--c-text-light); }

/* ===== CTA 区 ===== */
.cta-section { padding: 60px 0; }
.cta-box {
    background: var(--c-dark); border-radius: var(--radius-xl);
    padding: 56px 44px; text-align: center; color: #fff;
    position: relative; overflow: hidden;
}
.cta-box h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 14px; position: relative; letter-spacing: -0.5px; }
.cta-box p { font-size: 1.1rem; opacity: .7; margin-bottom: 28px; position: relative; }
.cta-box .btn { position: relative; }
.cta-box .btn-primary { background: #fff; color: var(--c-dark); }
.cta-box .btn-primary:hover { background: var(--c-bg-alt); }

/* ===== 联系页面 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
.contact-info-card {
    background: var(--c-bg-card); border-radius: var(--radius-lg);
    padding: 36px; border: 1px solid var(--c-border);
}
.contact-info-item { display: flex; gap: 14px; margin-bottom: 24px; }
.contact-info-icon {
    width: 44px; height: 44px; border-radius: 10px; flex-shrink: 0;
    background: var(--c-primary-light); color: var(--c-primary);
    display: flex; align-items: center; justify-content: center;
}
.contact-info-item h4 { font-size: .95rem; color: var(--c-dark); margin-bottom: 3px; }
.contact-info-item p { color: var(--c-text-light); font-size: .92rem; }
.contact-form-card {
    background: var(--c-bg-card); border-radius: var(--radius-lg);
    padding: 36px; border: 1px solid var(--c-border);
}
.form-group { margin-bottom: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-label { display: block; font-weight: 600; font-size: .88rem; margin-bottom: 7px; color: var(--c-dark); }
.form-label .req { color: var(--c-accent); }
.form-input, .form-textarea, .form-select {
    width: 100%; padding: 12px 16px; border-radius: var(--radius-sm);
    border: 1px solid var(--c-border); font-family: inherit; font-size: .92rem;
    transition: var(--transition); background: var(--c-bg);
    color: var(--c-text);
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
    outline: none; border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, .12);
}
.form-textarea { min-height: 130px; resize: vertical; }
.form-error { color: #ef4444; font-size: .82rem; margin-top: 5px; }
.form-success {
    background: #ecfdf5; color: #059669; border: 1px solid #a7f3d0;
    padding: 14px 18px; border-radius: var(--radius-sm); margin-bottom: 20px;
    display: flex; align-items: center; gap: 10px; font-size: .92rem;
}
.form-success svg { flex-shrink: 0; }

/* ===== 页面横幅 ===== */
.page-banner {
    background: var(--c-bg-alt); color: var(--c-text);
    padding: 140px 0 60px; text-align: center; position: relative;
    border-bottom: 1px solid var(--c-border-light);
}
.page-banner-content { position: relative; z-index: 2; }
.page-banner h1 { font-size: 2.8rem; font-weight: 800; margin-bottom: 10px; color: var(--c-dark); letter-spacing: -0.5px; }
.page-banner p { font-size: 1.1rem; color: var(--c-text-light); }
.breadcrumb { display: flex; gap: 8px; justify-content: center; margin-top: 18px; font-size: .88rem; color: var(--c-text-light); }
.breadcrumb a { color: var(--c-primary); }
.breadcrumb a:hover { text-decoration: underline; }

/* ===== 项目详情弹窗 ===== */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(17, 24, 39, 0.6); backdrop-filter: blur(4px);
    z-index: 2000; display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden; transition: var(--transition); padding: 20px;
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal-box {
    background: var(--c-white); border-radius: var(--radius-xl);
    max-width: 640px; width: 100%; max-height: 85vh; overflow-y: auto;
    transform: scale(.95); transition: var(--transition);
}
.modal-overlay.active .modal-box { transform: scale(1); }
.modal-cover { height: 200px; border-radius: var(--radius-xl) var(--radius-xl) 0 0; display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,.5); font-size: 2.5rem; font-weight: 800; overflow: hidden; background: #f3f4f6; }
.modal-cover img { display: block; }
.modal-body { padding: 32px; }
.modal-body h2 { font-size: 1.6rem; margin-bottom: 10px; color: var(--c-dark); }
.modal-meta { display: flex; gap: 24px; margin-bottom: 18px; flex-wrap: wrap; }
.modal-meta-item .label { font-size: .78rem; color: var(--c-text-light); }
.modal-meta-item .value { font-weight: 600; color: var(--c-dark); font-size: .92rem; }
.modal-close {
    position: absolute; top: 16px; right: 16px; width: 36px; height: 36px;
    border-radius: 8px; background: rgba(255,255,255,.2); color: #fff;
    display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
    transition: var(--transition); z-index: 10;
}
.modal-close:hover { background: rgba(255,255,255,.35); }

/* ===== 页脚 ===== */
.footer { background: var(--c-dark); color: rgba(255,255,255,.6); padding: 56px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 36px; margin-bottom: 36px; }
.footer-col { min-width: 0; }
.footer-brand .nav-logo { color: #fff; margin-bottom: 14px; }
.footer-desc { font-size: .88rem; margin-bottom: 18px; line-height: 1.8; }
.social-links { display: flex; gap: 10px; }
.social-link {
    width: 36px; height: 36px; border-radius: 8px;
    background: rgba(255,255,255,.06); display: flex; align-items: center; justify-content: center;
    transition: var(--transition); color: rgba(255,255,255,.5);
}
.social-link:hover { background: var(--c-primary); color: #fff; }
.footer-title { color: #fff; font-size: .95rem; font-weight: 600; margin-bottom: 16px; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: .88rem; transition: var(--transition); }
.footer-links a:hover { color: #fff; }
.footer-contact li { margin-bottom: 10px; font-size: .88rem; word-break: break-all; overflow-wrap: break-word; }
.footer-contact strong { color: rgba(255,255,255,.8); }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.08); padding-top: 20px;
    display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px;
    font-size: .82rem;
}
.footer-bottom a { color: rgba(255,255,255,.5); }
.footer-bottom a:hover { color: #fff; }

/* ===== 动画工具类 ===== */
.fade-in-up { opacity: 0; transform: translateY(30px); transition: opacity .6s ease, transform .6s ease; }
.fade-in-up.visible { opacity: 1; transform: translateY(0); }
.fade-in { opacity: 0; transition: opacity .6s ease; }
.fade-in.visible { opacity: 1; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
    .footer-grid .footer-col:last-child { grid-column: 1 / -1; }
    .team-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 968px) {
    .services-grid, .portfolio-grid, .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .team-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid, .contact-grid { grid-template-columns: 1fr; }
    .hero-title { font-size: 2.6rem; }
    .section-title { font-size: 1.9rem; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
    .footer-grid .footer-col:first-child { grid-column: 1 / -1; }
}
/* ===== 侧边栏遮罩 ===== */
.nav-backdrop {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .35s ease, visibility .35s ease;
    z-index: 998;
}
.nav-backdrop.active {
    opacity: 1;
    visibility: visible;
}

/* ===== 侧边栏组件（桌面端默认隐藏，移动端样式在媒体查询中） ===== */
.nav-menu-header {
    display: none;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 20px;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--c-border-light);
}
.nav-menu-title {
    font-size: .85rem;
    font-weight: 600;
    color: var(--c-gray-light);
    letter-spacing: 2px;
    text-transform: uppercase;
}
.nav-menu-footer {
    display: none;
    margin-top: auto;
    padding-top: 24px;
    border-top: 1px solid var(--c-border-light);
    text-align: center;
}
.nav-menu-tagline {
    font-size: .85rem;
    color: var(--c-gray-light);
    margin-bottom: 16px;
    line-height: 1.5;
}
.nav-menu-social {
    display: flex;
    justify-content: center;
    gap: 16px;
}
.nav-menu-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--c-bg-alt);
    color: var(--c-gray);
    transition: var(--transition);
}
.nav-menu-social a:hover {
    background: var(--c-primary);
    color: #fff;
    transform: translateY(-2px);
}

/* ===== 移动端响应式（侧边栏） ===== */
@media (max-width: 640px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -320px;
        width: 300px;
        max-width: 85vw;
        height: 100vh;
        background: #fff;
        flex-direction: column;
        justify-content: flex-start;
        padding: 20px 20px 24px;
        gap: 0;
        box-shadow: -20px 0 50px rgba(0,0,0,.15);
        transition: right .4s cubic-bezier(.4,0,.2,1);
        z-index: 999;
        overflow-y: auto;
        display: flex !important;
    }
    .nav-menu.active {
        right: 0;
    }

    /* 侧边栏组件显示 */
    .nav-menu-header { display: flex; }
    .nav-menu-footer { display: block; }
    .nav-icon { display: none; }

    /* 侧边栏菜单项布局 */
    .nav-menu-items {
        display: flex !important;
        flex-direction: column !important;
        flex-wrap: nowrap !important;
        gap: 8px !important;
        width: 100% !important;
        align-items: stretch !important;
    }
    .nav-menu-items .nav-link {
        display: flex !important;
        align-items: center !important;
        gap: 14px !important;
        padding: 14px 16px !important;
        border-radius: 12px !important;
        font-size: 1rem !important;
        font-weight: 500 !important;
        color: var(--c-dark) !important;
        position: relative;
        overflow: hidden;
        opacity: 0;
        transform: translateX(30px);
        transition: opacity .4s ease, transform .4s ease, background .25s ease, color .25s ease;
    }
    .nav-menu.active .nav-menu-items .nav-link {
        opacity: 1;
        transform: translateX(0);
    }
    .nav-menu.active .nav-menu-items .nav-link:nth-child(1) { transition-delay: .15s; }
    .nav-menu.active .nav-menu-items .nav-link:nth-child(2) { transition-delay: .2s; }
    .nav-menu.active .nav-menu-items .nav-link:nth-child(3) { transition-delay: .25s; }
    .nav-menu.active .nav-menu-items .nav-link:nth-child(4) { transition-delay: .3s; }
    .nav-menu.active .nav-menu-items .nav-link:nth-child(5) { transition-delay: .35s; }
    .nav-menu.active .nav-menu-items .nav-link:nth-child(6) { transition-delay: .4s; }

    /* 隐藏桌面端下划线，显示移动端左指示条 */
    .nav-menu-items .nav-link::after { display: none; }
    .nav-menu-items .nav-link::before {
        content: '';
        position: absolute;
        left: 0;
        top: 50%;
        transform: translateY(-50%);
        width: 3px;
        height: 0;
        background: var(--c-primary);
        border-radius: 0 3px 3px 0;
        transition: height .25s ease;
    }
    .nav-menu-items .nav-link:hover {
        background: var(--c-bg-alt);
        color: var(--c-primary) !important;
    }
    .nav-menu-items .nav-link:hover::before {
        height: 20px;
    }
    .nav-menu-items .nav-link.active {
        background: rgba(79, 70, 229, 0.08);
        color: var(--c-primary) !important;
        font-weight: 600;
    }
    .nav-menu-items .nav-link.active::before {
        height: 24px;
    }
    .nav-menu-items .nav-link.nav-cta {
        background: var(--c-primary) !important;
        color: #fff !important;
        margin-top: 8px;
        justify-content: center;
        padding: 16px;
        font-weight: 600;
        box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
    }
    .nav-menu-items .nav-link.nav-cta:hover {
        background: var(--c-primary-dark) !important;
        color: #fff !important;
        transform: translateY(-1px);
    }
    .nav-menu-items .nav-link.nav-cta::before {
        display: none;
    }

    /* 汉堡按钮 */
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    .nav-toggle.active {
        z-index: 1002;
    }
    .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
    .nav-toggle.active span:nth-child(2) { opacity: 0; }
    .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(7px,-7px); }

    body.nav-open {
        overflow: hidden;
    }

    .services-grid, .portfolio-grid, .testimonials-grid, .team-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
    .hero-stats { gap: 24px; flex-wrap: wrap; }
    .hero-title { font-size: 2rem; }
    .hero-desc { font-size: 1rem; }
    .hero-badge { font-size: .78rem; }
    .form-row { grid-template-columns: 1fr; }
    .section { padding: 50px 0; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .about-features { grid-template-columns: 1fr; }

    /* 缩小大内边距元素 */
    .service-card { padding: 28px 22px; }
    .contact-info-card, .contact-form-card { padding: 24px; }
    .cta-box { padding: 40px 24px; }
    .cta-box h2 { font-size: 1.7rem; }
    .modal-body { padding: 24px; }
    .portfolio-overlay { padding: 18px; }
    .about-visual-content .big-num { font-size: 3.2rem; }
    .section-title { font-size: 1.6rem; }
    .page-banner h1 { font-size: 2rem; }
    .page-banner { padding: 120px 0 40px; }
}

/* ===== 超小屏手机断点（≤480px） ===== */
@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-title { font-size: 1.65rem; }
    .hero-stat .num { font-size: 1.6rem; }
    .hero-stats { gap: 16px; }
    .section-title { font-size: 1.4rem; }
    .section { padding: 40px 0; }
    .section-header { margin-bottom: 36px; }
    .cta-box { padding: 32px 18px; }
    .cta-box h2 { font-size: 1.4rem; }
    .cta-box p { font-size: .95rem; }
    .stats-grid { grid-template-columns: 1fr; gap: 16px; }
    .stat-num { font-size: 2.2rem; }
    .page-banner h1 { font-size: 1.6rem; }
    .page-banner p { font-size: .95rem; }
    .service-card { padding: 24px 18px; }
    .contact-info-card, .contact-form-card { padding: 20px; }
    .modal-body { padding: 20px; }
    .modal-meta { gap: 14px; }
    .about-visual-content .big-num { font-size: 2.6rem; }
    .about-visual-content .desc { font-size: .95rem; }
    .footer { padding: 40px 0 20px; }
    .btn { padding: 10px 22px; font-size: .85rem; }
}

/* ===== 极小屏断点（≤375px） ===== */
@media (max-width: 375px) {
    .container { padding: 0 14px; }
    .hero-title { font-size: 1.45rem; }
    .hero-desc { font-size: .92rem; }
    .hero-actions { gap: 10px; }
    .hero-stats { flex-direction: column; gap: 14px; }
    .section-title { font-size: 1.25rem; }
    .blog-hero-title { font-size: 1.5rem; }
    .article-title { font-size: 1.35rem; }
    .cta-box h2 { font-size: 1.2rem; }
    .cta-box { padding: 28px 14px; }
    .nav-menu { width: 260px; }
    .logo-text { display: none; }
    .filter-tab { padding: 6px 14px; font-size: .78rem; }
}

/* ================================================================
   博客页面样式（全新杂志风格设计）
   ================================================================ */

/* ===== 博客列表 Hero ===== */
.blog-hero {
    position: relative;
    padding: 140px 0 60px;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(180deg, #f0f4ff 0%, #ffffff 100%);
}
.blog-hero-inner { position: relative; z-index: 2; max-width: 680px; margin: 0 auto; }
.blog-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: 30px;
    background: rgba(79, 70, 229, 0.08);
    color: var(--c-primary);
    font-size: .85rem;
    font-weight: 600;
    margin-bottom: 20px;
}
.blog-hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--c-dark);
    line-height: 1.2;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
}
.blog-hero-subtitle {
    font-size: 1.1rem;
    color: var(--c-text-light);
    line-height: 1.6;
}
.blog-hero-bg {
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(79,70,229,0.06) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 1;
}

/* ===== 博客主区域 ===== */
.blog-main { padding: 0 0 60px; }

/* ===== 筛选栏 ===== */
.blog-filter-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin-bottom: 48px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--c-border-light);
}
.filter-tabs {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    justify-content: center;
}
.filter-tab {
    padding: 8px 22px;
    border-radius: 10px;
    color: var(--c-text-light);
    font-weight: 600;
    font-size: .9rem;
    transition: var(--transition);
}
.filter-tab:hover { color: var(--c-primary); background: var(--c-primary-light); }
.filter-tab.active { background: var(--c-primary); color: #fff; }
.filter-tags { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.filter-tag {
    padding: 5px 14px;
    border-radius: 20px;
    background: var(--c-bg-alt);
    color: var(--c-gray);
    font-size: .8rem;
    font-weight: 500;
    border: 1px solid var(--c-border);
    transition: var(--transition);
}
.filter-tag:hover { border-color: var(--c-primary); color: var(--c-primary); }
.filter-tag.active { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

/* ===== 博客通用组件 ===== */
.blog-meta-sep {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--c-gray-light);
    flex-shrink: 0;
}
.blog-meta-date { color: var(--c-gray); font-size: .82rem; }
.blog-meta-read { color: var(--c-gray); font-size: .82rem; }
.blog-author-mini {
    display: flex;
    align-items: center;
    gap: 8px;
}
.blog-author-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--c-primary-light);
    color: var(--c-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: .78rem;
    flex-shrink: 0;
}
.blog-author-avatar.sm { width: 22px; height: 22px; font-size: .7rem; }
.blog-author-name { font-size: .85rem; font-weight: 600; color: var(--c-dark-2); }

/* ===== 特色文章（首篇大卡片） ===== */
.blog-featured {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    margin-bottom: 40px;
    cursor: pointer;
    transition: var(--transition);
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
}
.blog-featured:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px -10px rgba(0,0,0,0.12);
    border-color: var(--c-primary);
}
.blog-featured-cover {
    position: relative;
    min-height: 340px;
    overflow: hidden;
}
.blog-featured-cat {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 6px 16px;
    border-radius: 8px;
    background: rgba(255,255,255,0.95);
    color: var(--c-primary);
    font-size: .78rem;
    font-weight: 700;
    backdrop-filter: blur(4px);
}
.blog-featured-body {
    padding: 40px 44px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.blog-featured-label {
    font-size: .75rem;
    font-weight: 700;
    color: var(--c-accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 14px;
}
.blog-featured-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--c-dark);
    line-height: 1.3;
    letter-spacing: -0.3px;
    margin-bottom: 14px;
    transition: var(--transition);
}
.blog-featured:hover .blog-featured-title { color: var(--c-primary); }
.blog-featured-excerpt {
    font-size: .95rem;
    color: var(--c-text-light);
    line-height: 1.7;
    margin-bottom: 24px;
}
.blog-featured-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}
.blog-featured-arrow {
    font-size: .9rem;
    font-weight: 700;
    color: var(--c-primary);
    margin-top: auto;
}

/* ===== 文章列表网格 ===== */
.blog-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.blog-item {
    background: var(--c-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--c-border);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.blog-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--c-primary);
}
.blog-item-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 16/10;
    overflow: hidden;
}
.blog-item-cat {
    position: absolute;
    top: 14px;
    left: 14px;
    padding: 4px 12px;
    border-radius: 6px;
    background: rgba(255,255,255,0.92);
    color: var(--c-primary);
    font-size: .72rem;
    font-weight: 600;
    backdrop-filter: blur(4px);
}
.blog-item-body {
    padding: 22px 24px 26px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.blog-item-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--c-dark);
    line-height: 1.4;
    margin-bottom: 10px;
    transition: var(--transition);
}
.blog-item:hover .blog-item-title { color: var(--c-primary); }
.blog-item-excerpt {
    font-size: .88rem;
    color: var(--c-text-light);
    line-height: 1.6;
    margin-bottom: 18px;
    flex: 1;
}
.blog-item-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--c-border-light);
}

/* ===== 博客空状态 ===== */
.blog-empty {
    text-align: center;
    padding: 80px 40px;
    background: var(--c-bg-alt);
    border-radius: var(--radius-xl);
    margin: 40px 0;
}
.blog-empty-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--c-primary-light);
    color: var(--c-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}
.blog-empty-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--c-dark);
    margin-bottom: 10px;
}
.blog-empty-desc {
    font-size: .98rem;
    color: var(--c-text-light);
}

/* ===== 博客详情页 ===== */
.article-hero {
    position: relative;
    padding: 120px 0 50px;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(180deg, #f0f4ff 0%, #ffffff 100%);
}
.article-hero-bg {
    position: absolute;
    top: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(79,70,229,0.05) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
}
.article-back {
    position: relative;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--c-text-light);
    font-size: .88rem;
    font-weight: 500;
    margin-bottom: 32px;
    transition: var(--transition);
}
.article-back:hover { color: var(--c-primary); }
.article-hero-content { position: relative; z-index: 2; max-width: 760px; margin: 0 auto; }
.article-hero-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    font-size: .85rem;
    color: var(--c-text-light);
}
.article-cat {
    padding: 5px 16px;
    border-radius: 8px;
    background: var(--c-primary-light);
    color: var(--c-primary);
    font-size: .8rem;
    font-weight: 700;
}
.article-meta-dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--c-gray-light);
}
.article-title {
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--c-dark);
    line-height: 1.3;
    letter-spacing: -0.5px;
    margin-bottom: 20px;
}
.article-excerpt {
    font-size: 1.1rem;
    color: var(--c-text-light);
    line-height: 1.7;
    margin-bottom: 32px;
}
.article-author-bar {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 10px 24px 10px 10px;
    border-radius: 40px;
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    box-shadow: var(--shadow-sm);
}
.article-author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--c-primary-light);
    color: var(--c-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
}
.article-author-name { font-weight: 600; color: var(--c-dark); font-size: .92rem; }
.article-author-role { font-size: .78rem; color: var(--c-text-light); }

/* ===== 文章封面图 ===== */
.article-cover-wrap { max-width: 900px; margin: 0 auto; padding: 0 20px; }
.article-cover-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-top: -30px;
    position: relative;
    z-index: 3;
}
/* ===== 文章正文 ===== */
.article-body-wrap { padding: 60px 0; }
.article-body-wrap .container { max-width: 740px; }
.article-content {
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--c-text);
}
.article-content h1, .article-content h2, .article-content h3 {
    color: var(--c-dark);
    font-weight: 700;
    line-height: 1.35;
    margin-top: 1.8em;
    margin-bottom: .6em;
}
.article-content h1 { font-size: 2rem; letter-spacing: -0.5px; }
.article-content h2 { font-size: 1.6rem; letter-spacing: -0.3px; }
.article-content h3 { font-size: 1.3rem; }
.article-content p { margin-bottom: 1.3em; line-height: 1.85; }
.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1.5em 0;
    box-shadow: var(--shadow-md);
}
.article-content blockquote {
    border-left: 4px solid var(--c-primary);
    padding: 16px 24px;
    margin: 1.5em 0;
    background: var(--c-primary-light);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--c-dark-2);
    font-style: italic;
}
.article-content blockquote p { margin: 0; }
.article-content ul, .article-content ol { padding-left: 1.4em; margin-bottom: 1.3em; }
.article-content li { margin-bottom: .5em; line-height: 1.75; }
.article-content ul li { list-style: disc; }
.article-content ol li { list-style: decimal; }
.article-content code {
    background: var(--c-bg-alt);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: .9em;
    color: var(--c-primary);
    font-family: 'Fira Code', 'Consolas', monospace;
}
.article-content pre {
    background: var(--c-dark);
    color: #e5e7eb;
    padding: 24px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 1.5em 0;
    font-size: .88rem;
    line-height: 1.6;
}
.article-content pre code { background: transparent; color: inherit; padding: 0; font-size: inherit; }
.article-content a {
    color: var(--c-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: var(--transition);
}
.article-content a:hover { color: var(--c-primary-dark); }
.article-content hr { border: none; border-top: 1px solid var(--c-border); margin: 2em 0; }

/* ===== 文章标签 ===== */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--c-border-light);
}
.article-tag {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 8px;
    background: var(--c-bg-alt);
    color: var(--c-text-light);
    font-size: .82rem;
    font-weight: 500;
    border: 1px solid var(--c-border);
    transition: var(--transition);
}
.article-tag:hover {
    border-color: var(--c-primary);
    color: var(--c-primary);
    background: var(--c-primary-light);
}

/* ===== 上一篇/下一篇导航 ===== */
.article-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--c-border-light);
}
.article-nav-item {
    padding: 24px 28px;
    border-radius: var(--radius-md);
    background: var(--c-bg-alt);
    border: 1px solid var(--c-border);
    transition: var(--transition);
}
.article-nav-item:hover { border-color: var(--c-primary); box-shadow: var(--shadow-md); }
.article-nav-item.next { text-align: right; }
.article-nav-item a { text-decoration: none; }
.article-nav-label {
    display: block;
    font-size: .78rem;
    color: var(--c-text-light);
    font-weight: 500;
    margin-bottom: 6px;
}
.article-nav-title {
    display: block;
    font-size: .95rem;
    font-weight: 600;
    color: var(--c-dark);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: var(--transition);
}
.article-nav-item:hover .article-nav-title { color: var(--c-primary); }
.article-nav-empty {
    font-size: .85rem;
    color: var(--c-gray-light);
    font-style: italic;
}

/* ===== 相关文章 ===== */
.article-related {
    padding: 60px 0 80px;
    background: var(--c-bg-alt);
}
.article-related-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--c-dark);
    text-align: center;
    margin-bottom: 36px;
}
.article-related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.article-related-card {
    background: var(--c-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--c-border);
    text-decoration: none;
    transition: var(--transition);
}
.article-related-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--c-primary);
}
.article-related-cover {
    width: 100%;
    aspect-ratio: 16/10;
    overflow: hidden;
}
.article-related-body { padding: 20px 22px 24px; }
.article-related-cat {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 6px;
    background: var(--c-primary-light);
    color: var(--c-primary);
    font-size: .72rem;
    font-weight: 600;
    margin-bottom: 10px;
}
.article-related-body h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--c-dark);
    line-height: 1.4;
    margin-bottom: 8px;
    transition: var(--transition);
}
.article-related-card:hover h4 { color: var(--c-primary); }
.article-related-date { font-size: .8rem; color: var(--c-gray); }

/* ===== 响应式（博客页面） ===== */
@media (max-width: 968px) {
    .blog-featured { grid-template-columns: 1fr; }
    .blog-featured-cover { min-height: 240px; }
    .blog-featured-body { padding: 32px; }
    .blog-featured-title { font-size: 1.4rem; }
    .blog-list { grid-template-columns: repeat(2, 1fr); }
    .article-related-grid { grid-template-columns: repeat(2, 1fr); }
    .blog-hero-title { font-size: 2.2rem; }
    .article-title { font-size: 2.1rem; }
}
@media (max-width: 640px) {
    .blog-list { grid-template-columns: 1fr; gap: 24px; }
    .article-related-grid { grid-template-columns: 1fr; }
    .blog-hero { padding: 110px 0 40px; }
    .blog-hero-title { font-size: 1.8rem; }
    .blog-hero-subtitle { font-size: 1rem; }
    .blog-featured-body { padding: 24px; }
    .blog-featured-title { font-size: 1.2rem; }
    .blog-featured-meta { gap: 8px; flex-wrap: wrap; }
    .blog-item-body { padding: 18px 20px 22px; }
    .blog-item-title { font-size: 1.05rem; }
    .article-hero { padding: 100px 0 40px; }
    .article-title { font-size: 1.6rem; }
    .article-excerpt { font-size: 1rem; }
    .article-cover-img { margin-top: -16px; border-radius: var(--radius-lg); }
    .article-content { font-size: .96rem; }
    .article-content h1 { font-size: 1.6rem; }
    .article-content h2 { font-size: 1.3rem; }
    .article-content h3 { font-size: 1.1rem; }
    .article-nav { grid-template-columns: 1fr; }
    .article-nav-item.next { text-align: left; }
    .filter-tab { padding: 6px 16px; font-size: .82rem; }
    .filter-tag { padding: 4px 12px; font-size: .75rem; }
    .blog-empty { padding: 60px 24px; }
}

/* ===== 博客超小屏适配（≤480px） ===== */
@media (max-width: 480px) {
    .blog-hero-title { font-size: 1.5rem; }
    .blog-hero-subtitle { font-size: .92rem; }
    .blog-featured-cover { min-height: 200px; }
    .blog-featured-body { padding: 20px; }
    .blog-featured-title { font-size: 1.05rem; }
    .blog-item-body { padding: 16px 16px 20px; }
    .blog-item-title { font-size: .98rem; }
    .article-cover-wrap { padding: 0 14px; }
    .article-body-wrap { padding: 40px 0; }
    .article-nav-item { padding: 18px 20px; }
}