/* ============================================
   采无忧官网 - 现代SaaS风
   主色: #3b82f6  辅色: #2dd4bf
   ============================================ */

:root {
    --primary: #3b82f6;
    --primary-dark: #1d4ed8;
    --primary-darker: #1e40af;
    --teal: #2dd4bf;
    --bg: #f8fafc;
    --white: #ffffff;
    --text: #0f172a;
    --text-body: #334155;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --success: #10b981;
    --warning: #f59e0b;
    --radius: 24px;
    --radius-sm: 16px;
    --shadow: 0 4px 16px rgba(0,0,0,0.02);
    --shadow-md: 0 12px 28px -8px rgba(37,99,235,0.15);
    --shadow-lg: 0 30px 60px -20px rgba(15,23,42,0.15);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text-body);
    line-height: 1.6;
    font-size: 15px;
    overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; transition: all 0.2s; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 背景装饰 */
.bg-decoration {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1;
    background:
        radial-gradient(circle at 10% 20%, rgba(59,130,246,0.06), transparent 35%),
        radial-gradient(circle at 90% 60%, rgba(45,212,191,0.06), transparent 40%),
        #f8fafc;
    pointer-events: none;
}
.dot-pattern {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1;
    background-image: radial-gradient(rgba(59,130,246,0.08) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    padding: 1.5rem 0;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(59,130,246,0.08);
    box-shadow: 0 4px 24px rgba(0,0,0,0.04);
}
.navbar .container { display: flex; justify-content: space-between; align-items: center; }
.logo {
    display: flex; align-items: center; gap: 14px; color: var(--text); text-decoration: none;
}
.logo-icon {
    width: 56px; height: 56px; border-radius: 16px;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 1.6rem; font-weight: 800;
    box-shadow: 0 8px 24px rgba(59,130,246,0.35);
}
.logo-text {
    font-size: 1.8rem; font-weight: 800; letter-spacing: -0.5px;
    background: linear-gradient(135deg, #0f172a, #2563eb);
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.nav-links { display: flex; gap: 2.2rem; align-items: center; list-style: none; }
.nav-links a {
    color: #334155; text-decoration: none; font-weight: 600; font-size: 1.05rem;
    transition: color 0.2s; position: relative; white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active { color: #1d4ed8; }
.nav-links a.active::after {
    content: ''; position: absolute; bottom: -8px; left: 0; width: 100%; height: 3px;
    background: linear-gradient(90deg, #3b82f6, #2dd4bf); border-radius: 3px;
}
.nav-cta {
    padding: 0.75rem 1.8rem; border-radius: 40px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff !important; font-weight: 700; font-size: 1rem;
    text-decoration: none; transition: all 0.3s;
    box-shadow: 0 8px 20px rgba(37,99,235,0.3);
}
.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(37,99,235,0.4);
}
/* 汉堡菜单按钮 */
.nav-toggle { display: none; flex-direction: column; gap: 6px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 26px; height: 3px; background: #334155; border-radius: 2px; transition: all 0.3s; }
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }
.btn-outline:hover { background: #3b82f6; color: #fff; box-shadow: 0 8px 20px rgba(59,130,246,0.3); transform: translateY(-2px); }
/* 汉堡菜单按钮 */
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2.5px; background: #334155; border-radius: 2px; transition: all 0.3s; }
.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(5px, -5px); }

/* ===== Hero ===== */
.hero { padding: 9rem 0 3rem; position: relative; }
.hero-grid {
    display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 3rem; align-items: center;
}
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: #eff6ff; border: 1px solid #bfdbfe;
    padding: 0.4rem 1rem; border-radius: 40px;
    font-size: 0.78rem; font-weight: 600; color: #2563eb;
    margin-bottom: 1.2rem;
}
.hero h1 {
    font-size: 3.2rem; font-weight: 800; line-height: 1.15;
    letter-spacing: -2px; margin-bottom: 1.2rem; color: #0f172a;
}
.hero h1 .highlight {
    background: linear-gradient(135deg, #2563eb, #2dd4bf);
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-desc {
    font-size: 1.05rem; color: #475569; max-width: 560px;
    margin-bottom: 2rem; line-height: 1.8;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.btn-primary {
    padding: 0.9rem 2rem; border-radius: 40px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff; font-weight: 600; font-size: 0.95rem;
    text-decoration: none; transition: all 0.3s;
    box-shadow: 0 12px 28px -8px rgba(37,99,235,0.5);
    display: inline-flex; align-items: center; gap: 8px; border: none; cursor: pointer;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 18px 36px -8px rgba(37,99,235,0.65); color: #fff; }

.btn-ghost {
    padding: 0.9rem 1.8rem; border-radius: 40px;
    background: #fff; border: 1.5px solid #e2e8f0;
    color: #1e293b; font-weight: 600; font-size: 0.95rem;
    text-decoration: none; transition: all 0.3s;
    display: inline-flex; align-items: center; gap: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
}
.btn-ghost:hover { border-color: #3b82f6; color: #2563eb; transform: translateY(-3px); }

/* Hero右侧卡片 */
.hero-visual { position: relative; }
.visual-card {
    background: #fff; border-radius: 28px; border: 1px solid #e2e8f0;
    padding: 2rem; box-shadow: 0 24px 60px -20px rgba(15,23,42,0.12);
    position: relative; overflow: hidden;
}
.visual-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 5px;
    background: linear-gradient(90deg, #3b82f6, #2dd4bf, #3b82f6);
    background-size: 200% 100%;
}
.visual-header {
    display: flex; align-items: center; gap: 12px;
    margin-bottom: 1.2rem; padding-bottom: 1rem; border-bottom: 1px solid #f1f5f9;
}
.visual-avatar {
    width: 48px; height: 48px; border-radius: 14px;
    background: linear-gradient(135deg, #dbeafe, #e0f2fe);
    display: flex; align-items: center; justify-content: center;
    color: #2563eb; font-size: 1.3rem;
}
.visual-header h4 { font-size: 0.95rem; font-weight: 700; color: #0f172a; }
.visual-header p { font-size: 0.78rem; color: #64748b; }
.stat-row {
    display: flex; justify-content: space-between; align-items: center;
    padding: 0.8rem 0; border-bottom: 1px solid #f8fafc;
}
.stat-row:last-child { border-bottom: none; }
.stat-label { color: #64748b; font-size: 0.85rem; }
.stat-value { font-weight: 700; font-size: 0.9rem; color: #0f172a; }
.stat-value .accent {
    color: #0d9488; font-size: 0.72rem; font-weight: 600;
    background: #ccfbf1; padding: 0.15rem 0.6rem; border-radius: 30px; margin-left: 6px;
}

/* 信息条 */
.info-strip {
    background: #fff; border-radius: 20px; border: 1px solid #e2e8f0;
    padding: 1.2rem 2rem; display: flex; flex-wrap: wrap;
    justify-content: space-between; align-items: center; gap: 1.2rem;
    margin: 2.5rem 0 0; box-shadow: 0 8px 24px -10px rgba(15,23,42,0.06);
}
.info-item { display: flex; align-items: center; gap: 8px; color: #475569; font-size: 0.85rem; }
.info-item strong { color: #0f172a; font-weight: 700; }

/* ===== 通用章节 ===== */
.section { padding: 4rem 0; }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-tag {
    display: inline-block; background: #eff6ff; color: #2563eb;
    font-size: 0.72rem; font-weight: 700; padding: 0.3rem 1rem;
    border-radius: 40px; letter-spacing: 1px; margin-bottom: 0.8rem;
}
.section-title {
    font-size: 2.2rem; font-weight: 800; letter-spacing: -1px;
    color: #0f172a; margin-bottom: 0.8rem;
}
.section-sub { color: #64748b; max-width: 600px; margin: 0 auto; font-size: 1rem; }

/* ===== 数据条 ===== */
.stats-bar {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.2rem; margin-top: 1rem;
}
.stat-box {
    background: #fff; border-radius: 20px; border: 1px solid #e2e8f0;
    padding: 1.8rem 1.2rem; text-align: center; transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(0,0,0,0.02);
}
.stat-box:hover {
    transform: translateY(-5px); border-color: #bfdbfe;
    box-shadow: 0 20px 40px -16px rgba(59,130,246,0.15);
}
.stat-box .icon {
    width: 48px; height: 48px; border-radius: 14px;
    background: #eff6ff; color: #2563eb;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem; margin: 0 auto 1rem;
}
.stat-box .num { font-size: 2rem; font-weight: 800; color: #0f172a; letter-spacing: -1px; line-height: 1; margin-bottom: 0.4rem; }
.stat-box .num .unit { font-size: 0.9rem; font-weight: 600; color: #3b82f6; }
.stat-box .label { font-size: 0.85rem; color: #64748b; }

/* ===== 课程卡片 ===== */
.cards-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem;
}
.card {
    background: #fff; border-radius: 24px; border: 1px solid #e2e8f0;
    padding: 2rem 1.8rem; transition: all 0.3s;
    position: relative; overflow: hidden; box-shadow: 0 4px 16px rgba(0,0,0,0.02);
    display: block; color: inherit;
}
.card::after {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, #3b82f6, #2dd4bf);
    opacity: 0; transition: opacity 0.3s;
}
.card:hover { transform: translateY(-6px); border-color: #bfdbfe; box-shadow: 0 24px 50px -20px rgba(15,23,42,0.18); color: inherit; }
.card:hover::after { opacity: 1; }
.card-icon {
    width: 52px; height: 52px; border-radius: 16px;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; color: #2563eb; margin-bottom: 1.4rem; font-weight: 700;
}
.card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 0.7rem; color: #0f172a; }
.card p { color: #64748b; font-size: 0.9rem; line-height: 1.7; margin-bottom: 1.1rem; }
.card-tag {
    display: inline-block; background: #f0fdfa; color: #0d9488;
    font-size: 0.72rem; font-weight: 600; padding: 0.25rem 0.8rem; border-radius: 30px;
}

/* ===== 认证专区 ===== */
.cert-wrapper {
    background: linear-gradient(135deg, #eff6ff 0%, #f0fdfa 100%);
    border-radius: 32px; padding: 3.5rem 3rem;
    display: grid; grid-template-columns: 1fr 1fr; gap: 3rem;
    align-items: center; border: 1px solid #dbeafe;
}
.cert-content h2 {
    font-size: 2.2rem; font-weight: 800; letter-spacing: -1px;
    margin-bottom: 1rem; color: #0f172a; line-height: 1.25;
}
.cert-content > p { color: #475569; margin-bottom: 1.8rem; font-size: 0.95rem; line-height: 1.8; }
.cert-list { list-style: none; margin-bottom: 2rem; }
.cert-list li {
    display: flex; align-items: flex-start; gap: 10px;
    margin-bottom: 0.8rem; color: #334155; font-size: 0.92rem;
}
.cert-list .check { color: #2563eb; font-weight: 700; flex-shrink: 0; }
.cert-visual {
    background: #fff; border-radius: 28px; border: 1px solid #e2e8f0;
    padding: 2.5rem 2rem; text-align: center;
    box-shadow: 0 20px 50px -20px rgba(15,23,42,0.12);
}
.badge-large {
    width: 90px; height: 90px; border-radius: 50%;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border: 3px solid #fff;
    box-shadow: 0 12px 30px -8px rgba(37,99,235,0.25);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1.2rem; font-size: 2.5rem; color: #2563eb;
}
.cert-visual h4 { font-size: 1.3rem; font-weight: 700; color: #0f172a; margin-bottom: 0.3rem; }
.cert-visual .sub { color: #64748b; margin-bottom: 1.8rem; font-size: 0.85rem; }
.mini-stats {
    display: flex; justify-content: center; gap: 2rem;
    border-top: 1px solid #f1f5f9; padding-top: 1.5rem;
}
.mini-stat-item .num { font-size: 1.3rem; font-weight: 800; color: #2563eb; }
.mini-stat-item .label { font-size: 0.72rem; color: #64748b; margin-top: 0.2rem; }

/* ===== 服务流程 ===== */
.steps-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.2rem;
}
.step-item {
    background: #fff; border-radius: 20px; padding: 1.8rem 1.4rem;
    border: 1px solid #e2e8f0; transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(0,0,0,0.02);
}
.step-item:hover {
    transform: translateY(-5px); border-color: #bfdbfe;
    box-shadow: 0 20px 40px -18px rgba(59,130,246,0.2);
}
.step-num { font-size: 2.2rem; font-weight: 800; color: #dbeafe; line-height: 1; margin-bottom: 0.8rem; }
.step-item h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.5rem; color: #0f172a; }
.step-item p { color: #64748b; font-size: 0.85rem; line-height: 1.7; }

/* ===== 优势 ===== */
.advantage-grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem;
}
.advantage-item {
    display: flex; gap: 1rem; background: #fff; border-radius: 20px;
    padding: 1.6rem; border: 1px solid #e2e8f0; transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(0,0,0,0.02);
}
.advantage-item:hover { border-color: #bfdbfe; box-shadow: 0 16px 40px -16px rgba(59,130,246,0.15); }
.advantage-icon {
    width: 48px; height: 48px; border-radius: 14px;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    color: #2563eb; display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; flex-shrink: 0;
}
.advantage-item h4 { font-size: 1rem; font-weight: 700; margin-bottom: 0.3rem; color: #0f172a; }
.advantage-item p { color: #64748b; font-size: 0.85rem; line-height: 1.7; }

/* ===== 学员评价 ===== */
.testimonials-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem;
}
.testimonial {
    background: #fff; border-radius: 24px; padding: 1.8rem;
    border: 1px solid #e2e8f0; box-shadow: 0 4px 16px rgba(0,0,0,0.02);
    transition: all 0.3s;
}
.testimonial:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 50px -20px rgba(15,23,42,0.15);
    border-color: #bfdbfe;
}
.testimonial .stars { color: #f59e0b; font-size: 0.85rem; margin-bottom: 0.8rem; letter-spacing: 2px; }
.testimonial p { color: #334155; font-size: 0.9rem; line-height: 1.8; margin-bottom: 1.2rem; font-style: italic; }
.testimonial-author {
    display: flex; align-items: center; gap: 10px;
    border-top: 1px solid #f1f5f9; padding-top: 1rem;
}
.testimonial-avatar {
    width: 40px; height: 40px; border-radius: 50%;
    background: linear-gradient(135deg, #dbeafe, #e0f2fe);
    display: flex; align-items: center; justify-content: center;
    color: #2563eb; font-weight: 700; font-size: 0.85rem;
}
.testimonial-author h5 { font-size: 0.88rem; font-weight: 700; color: #0f172a; }
.testimonial-author span { font-size: 0.75rem; color: #94a3b8; }

/* ===== FAQ ===== */
.faq-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem;
}
.faq-item {
    background: #fff; border-radius: 18px; padding: 1.4rem 1.6rem;
    border: 1px solid #e2e8f0; transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(0,0,0,0.02);
}
.faq-item:hover { border-color: #bfdbfe; box-shadow: 0 12px 30px -12px rgba(59,130,246,0.12); }
.faq-item h4 { font-size: 0.95rem; font-weight: 700; color: #0f172a; margin-bottom: 0.5rem; }
.faq-item p { color: #64748b; font-size: 0.88rem; line-height: 1.7; }

/* ===== 留言模块 ===== */
.message-wrapper {
    background: #fff; border-radius: 32px; border: 1px solid #e2e8f0;
    box-shadow: 0 30px 70px -30px rgba(15,23,42,0.15);
    overflow: hidden; display: grid; grid-template-columns: 0.85fr 1.15fr;
}
.message-info {
    background: linear-gradient(160deg, #1d4ed8 0%, #2563eb 50%, #3b82f6 100%);
    padding: 3rem 2.5rem; color: #fff; position: relative; overflow: hidden;
}
.message-info::before {
    content: ''; position: absolute; top: -80px; right: -80px;
    width: 260px; height: 260px; border-radius: 50%;
    background: rgba(255,255,255,0.08);
}
.message-info h3 { font-size: 1.7rem; font-weight: 800; margin-bottom: 0.8rem; line-height: 1.25; position: relative; z-index: 2; }
.message-info > p { color: rgba(255,255,255,0.82); font-size: 0.9rem; line-height: 1.8; margin-bottom: 2rem; position: relative; z-index: 2; }
.message-contact-list { list-style: none; margin-bottom: 2rem; position: relative; z-index: 2; }
.message-contact-list li { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 1.2rem; }
.mc-icon {
    width: 38px; height: 38px; border-radius: 10px;
    background: rgba(255,255,255,0.14);
    display: flex; align-items: center; justify-content: center;
    font-size: 0.95rem; flex-shrink: 0;
}
.mc-text h5 { font-size: 0.78rem; font-weight: 500; color: rgba(255,255,255,0.65); margin-bottom: 0.15rem; }
.mc-text span { font-size: 0.92rem; font-weight: 600; color: #fff; }
.message-promise {
    background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.18);
    border-radius: 14px; padding: 1rem 1.1rem; font-size: 0.82rem;
    line-height: 1.7; color: rgba(255,255,255,0.9); position: relative; z-index: 2;
}
.message-form { padding: 3rem 2.8rem; }
.message-form .form-head h3 { font-size: 1.4rem; font-weight: 800; color: #0f172a; margin-bottom: 0.3rem; }
.message-form .form-head p { color: #64748b; font-size: 0.88rem; margin-bottom: 1.5rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { margin-bottom: 1.1rem; }
.form-group label { display: block; font-size: 0.82rem; font-weight: 600; color: #334155; margin-bottom: 0.4rem; }
.form-group label .required { color: #ef4444; }
.form-control {
    width: 100%; padding: 0.8rem 1rem; border-radius: 12px;
    border: 1.5px solid #e2e8f0; background: #f8fafc;
    font-size: 0.9rem; color: #0f172a; font-family: inherit;
    transition: all 0.25s; outline: none;
}
.form-control:focus { border-color: #3b82f6; background: #fff; box-shadow: 0 0 0 4px rgba(59,130,246,0.12); }
select.form-control {
    appearance: none; -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 1rem center;
    background-size: 14px; padding-right: 2.4rem; cursor: pointer;
}
textarea.form-control { resize: vertical; min-height: 100px; line-height: 1.6; }
.btn-submit {
    width: 100%; padding: 0.95rem 2rem; border-radius: 40px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff; font-weight: 700; font-size: 0.95rem;
    border: none; cursor: pointer; transition: all 0.3s;
    box-shadow: 0 12px 28px -8px rgba(37,99,235,0.5);
    display: block; text-align: center; font-family: inherit; margin-top: 0.5rem;
}
.btn-submit:hover { transform: translateY(-3px); box-shadow: 0 18px 36px -8px rgba(37,99,235,0.65); color: #fff; }

/* ===== CTA ===== */
.cta-section {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    border-radius: 32px; padding: 3.5rem 3rem; text-align: center;
    position: relative; overflow: hidden;
    box-shadow: 0 30px 60px -20px rgba(37,99,235,0.4);
}
.cta-section::before {
    content: ''; position: absolute; top: -50%; right: -20%;
    width: 500px; height: 500px; border-radius: 50%;
    background: rgba(255,255,255,0.06);
}
.cta-section h2 { font-size: 2.2rem; font-weight: 800; color: #fff; letter-spacing: -1px; margin-bottom: 0.8rem; position: relative; z-index: 2; }
.cta-section p { color: rgba(255,255,255,0.85); max-width: 520px; margin: 0 auto 2rem; font-size: 1rem; position: relative; z-index: 2; }
.cta-buttons { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; position: relative; z-index: 2; }
.btn-white {
    padding: 0.9rem 2rem; border-radius: 40px;
    background: #fff; color: #1d4ed8; font-weight: 700;
    text-decoration: none; transition: all 0.3s;
    display: inline-flex; align-items: center; gap: 8px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}
.btn-white:hover { transform: translateY(-3px); color: #1d4ed8; }
.btn-outline-white {
    padding: 0.9rem 1.8rem; border-radius: 40px;
    background: transparent; border: 2px solid rgba(255,255,255,0.4);
    color: #fff; font-weight: 600; text-decoration: none;
    transition: all 0.3s; display: inline-flex; align-items: center; gap: 8px;
}
.btn-outline-white:hover { background: rgba(255,255,255,0.12); border-color: #fff; color: #fff; }

/* ===== 页脚 ===== */
.main-footer {
    background: #0f172a; color: #94a3b8;
    padding: 4rem 0 2rem; margin-top: 4rem;
}
.footer-grid {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 2.5rem; margin-bottom: 2.5rem;
}
.footer-brand p { font-size: 0.85rem; line-height: 1.8; max-width: 300px; margin-top: 1rem; }
.footer-col h5 { font-size: 0.92rem; margin-bottom: 1.2rem; color: #fff; font-weight: 700; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.7rem; }
.footer-col a { color: #94a3b8; text-decoration: none; font-size: 0.85rem; }
.footer-col a:hover { color: #60a5fa; }
.footer-contact li { display: flex; align-items: flex-start; gap: 8px; font-size: 0.85rem; margin-bottom: 0.7rem; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 1.5rem; text-align: center;
    font-size: 0.8rem; color: #64748b;
}

/* ===== 内页通用 ===== */
.page-banner {
    background: linear-gradient(135deg, #1d4ed8, #3b82f6);
    color: #fff; padding: 8rem 0 3rem; text-align: center;
}
.page-banner h1 { font-size: 2.5rem; margin-bottom: 0.8rem; font-weight: 800; }
.page-banner p { opacity: 0.85; font-size: 1rem; }
.content-page {
    background: #fff; border-radius: 24px; padding: 3rem;
    margin: 2rem 0; box-shadow: var(--shadow);
}
.content-page h2 { font-size: 1.5rem; color: #0f172a; margin: 2rem 0 1rem; }
.content-page p { margin-bottom: 1rem; font-size: 0.95rem; line-height: 1.9; }
.content-page ul { margin: 1rem 0 1rem 1.5rem; }
.content-page li { margin-bottom: 0.5rem; }

/* 文章卡片 */
.articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.article-card {
    background: #fff; border-radius: 20px; overflow: hidden;
    transition: all 0.3s; border: 1px solid #e2e8f0;
    box-shadow: 0 4px 16px rgba(0,0,0,0.02); display: block; color: inherit;
}
.article-card:hover {
    transform: translateY(-5px); border-color: #bfdbfe;
    box-shadow: 0 20px 50px -20px rgba(15,23,42,0.15); color: inherit;
}
.article-card-body { padding: 1.6rem; }
.category-tag {
    display: inline-block; background: #eff6ff; color: #2563eb;
    font-size: 0.72rem; padding: 0.25rem 0.8rem; border-radius: 30px;
    margin-bottom: 0.8rem; font-weight: 600;
}
.article-card h3 { font-size: 1rem; color: #0f172a; margin-bottom: 0.6rem; line-height: 1.5; font-weight: 700; }
.article-card p { font-size: 0.85rem; color: #64748b; line-height: 1.6; margin-bottom: 1rem; }
.article-card .meta { font-size: 0.78rem; color: #94a3b8; display: flex; justify-content: space-between; }

/* 文章详情 */
.article-detail {
    background: #fff; border-radius: 24px; padding: 3rem;
    margin: 8rem 0 2rem; box-shadow: var(--shadow);
}
.article-detail h1 { font-size: 1.8rem; color: #0f172a; line-height: 1.4; margin-bottom: 1.5rem; }
.article-meta { color: #94a3b8; font-size: 0.85rem; padding-bottom: 1.2rem; border-bottom: 1px solid #e2e8f0; margin-bottom: 2rem; }
.article-meta span { margin-right: 1.2rem; }
.article-content { font-size: 1rem; line-height: 1.9; }
.article-content h2 { font-size: 1.3rem; color: #0f172a; margin: 2rem 0 1rem; padding-left: 0.8rem; border-left: 4px solid #3b82f6; }
.article-content h3 { font-size: 1.1rem; color: #0f172a; margin: 1.5rem 0 0.8rem; }
.article-content p { margin-bottom: 1rem; }
.article-content ul, .article-content ol { margin: 1rem 0 1rem 1.5rem; }
.article-content li { margin-bottom: 0.5rem; }

/* FAQ列表页 */
.faq-list-item {
    background: #fff; border-radius: 18px; padding: 1.4rem 1.6rem;
    margin-bottom: 0.8rem; border: 1px solid #e2e8f0;
}
.faq-list-item h4 { font-size: 0.95rem; color: #0f172a; margin-bottom: 0.5rem; font-weight: 700; }
.faq-list-item p { color: #64748b; font-size: 0.88rem; line-height: 1.7; }

/* 后台 */
.admin-body { background: #f0f2f5; }
.admin-wrapper { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
.admin-sidebar { background: #1e293b; color: #fff; padding: 20px 0; }
.admin-sidebar h2 { padding: 0 20px 20px; font-size: 18px; border-bottom: 1px solid rgba(255,255,255,0.1); margin-bottom: 10px; }
.admin-sidebar a { display: block; padding: 12px 20px; color: rgba(255,255,255,0.7); font-size: 14px; }
.admin-sidebar a:hover, .admin-sidebar a.active { background: rgba(255,255,255,0.1); color: #fff; }
.admin-main { padding: 30px; }
.admin-main h1 { font-size: 22px; color: #0f172a; margin-bottom: 20px; }
.admin-card { background: #fff; border-radius: 16px; padding: 20px; box-shadow: var(--shadow); margin-bottom: 16px; }
.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th, .admin-table td { padding: 10px; text-align: left; border-bottom: 1px solid #e2e8f0; font-size: 14px; }
.admin-table th { background: #f8fafc; font-weight: 600; color: #0f172a; }
.btn-sm { padding: 5px 12px; font-size: 12px; border-radius: 6px; display: inline-block; }
.btn-danger { background: #dc2626; color: #fff; }
.btn-danger:hover { background: #b91c1c; color: #fff; }
.btn-success { background: #10b981; color: #fff; }
.login-box { max-width: 400px; margin: 100px auto; background: #fff; border-radius: 20px; padding: 40px; box-shadow: var(--shadow); }
.login-box h1 { text-align: center; color: #0f172a; margin-bottom: 24px; }

/* 分页 */
.pagination { text-align: center; margin-top: 30px; }
.pagination a, .pagination span {
    display: inline-block; padding: 8px 14px; margin: 0 3px;
    border: 1px solid #e2e8f0; border-radius: 8px; font-size: 14px;
}
.pagination .current { background: #2563eb; color: #fff; border-color: #2563eb; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; }
    .stats-bar { grid-template-columns: repeat(2, 1fr); }
    .cards-grid { grid-template-columns: repeat(2, 1fr); }
    .cert-wrapper { grid-template-columns: 1fr; padding: 2.5rem 2rem; }
    .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .testimonials-grid { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .message-wrapper { grid-template-columns: 1fr; }
    .articles-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 992px) {
    .nav-toggle { display: flex; }
    .nav-links {
        display: none; position: absolute; top: 100%; left: 0; right: 0;
        background: #fff; flex-direction: column; padding: 1rem;
        box-shadow: 0 8px 24px rgba(0,0,0,0.1); gap: 0; border-top: 1px solid #e2e8f0;
    }
    .nav-links.open { display: flex; }
    .nav-links li { width: 100%; }
    .nav-links a { display: block; padding: 0.8rem 1rem; border-radius: 8px; font-size: 0.95rem; }
    .nav-links a.active::after { display: none; }
    .hero h1 { font-size: 2.2rem; letter-spacing: -1px; }
    .hero { padding: 6rem 0 2rem; }
    .section { padding: 2.5rem 0; }
    .section-title { font-size: 1.7rem; }
    .stats-bar { grid-template-columns: 1fr 1fr; gap: 1rem; }
    .cards-grid { grid-template-columns: 1fr; }
    .advantage-grid { grid-template-columns: 1fr; }
    .testimonials-grid { grid-template-columns: 1fr; }
    .faq-grid { grid-template-columns: 1fr; }
    .steps-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .articles-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; gap: 0; }
    .message-info, .message-form { padding: 2rem 1.5rem; }
    .cta-section h2 { font-size: 1.7rem; }
    .content-page, .article-detail { padding: 1.5rem; }
}
}