/* ============================================================
   方略咨询官网 · 公共样式
   设计语言：深蓝主色 + 蓝色渐变强调
   ============================================================ */
:root {
    --navy: #0a1628;
    --navy-2: #152238;
    --navy-3: #1a2d4a;
    --blue: #2563eb;
    --blue-hover: #1e4bd2;
    --blue-light: #3b82f6;
    --accent: #7eb3ff;
    --bg: #ffffff;
    --bg-gray: #f8fafc;
    --text: #1a1f36;
    --text-muted: #5a6d8a;
    --text-faint: #6b7f9e;
    --border: #eef2fc;
    --border-blue: #d9e4ff;
    --green: #10b981;
    --radius: 24px;
    --radius-lg: 32px;
    --nav-h: 72px;
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 40px; }

/* ========== 导航栏 ========== */
.navbar {
    background: rgba(10, 22, 40, 0.96);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-h);
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #fff;
    font-size: 1.3rem;
    font-weight: 700;
}
.nav-logo .logo-mark {
    width: 36px; height: 36px;
    background: linear-gradient(135deg, var(--blue), var(--blue-light));
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; color: #fff;
}
.nav-links { display: flex; gap: 34px; }
.nav-links a {
    color: #a8b8d0;
    font-size: 0.95rem;
    transition: color 0.2s;
    position: relative;
    padding: 6px 0;
}
.nav-links a:hover { color: #fff; }
.nav-links a.active { color: #fff; font-weight: 600; }
.nav-links a.active::after {
    content: "";
    position: absolute; left: 0; right: 0; bottom: -4px;
    height: 2px; background: var(--blue); border-radius: 2px;
}
.nav-cta {
    background: var(--blue); color: #fff;
    padding: 10px 26px; border-radius: 60px;
    font-size: 0.9rem; font-weight: 600;
    transition: background 0.3s;
}
.nav-cta:hover { background: var(--blue-hover); }

/* 移动端汉堡菜单 */
.nav-toggle {
    display: none;
    flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer;
    padding: 6px;
}
.nav-toggle span {
    width: 24px; height: 2px;
    background: #fff; border-radius: 2px;
    transition: 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========== Hero ========== */
.hero {
    background: linear-gradient(145deg, var(--navy) 0%, var(--navy-2) 60%, var(--navy-3) 100%);
    padding: 90px 0 80px;
    position: relative; overflow: hidden;
}
.hero::before {
    content: "";
    position: absolute; top: -20%; right: -5%;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px; align-items: center;
    position: relative; z-index: 2;
}
.hero-brand {
    display: inline-block;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--accent);
    padding: 8px 24px; border-radius: 60px;
    font-size: 0.95rem; margin-bottom: 28px;
}
.hero h1 {
    font-size: 3.2rem; font-weight: 800;
    line-height: 1.2; color: #fff; margin-bottom: 24px;
}
.hero h1 .highlight {
    background: linear-gradient(135deg, #4d94ff, #7eb3ff);
    -webkit-background-clip: text; background-clip: text;
    color: transparent;
}
.hero-sub {
    font-size: 1.2rem; color: #a8b8d0;
    margin-bottom: 36px; max-width: 560px; line-height: 1.7;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

/* ========== 按钮 ========== */
.btn-primary {
    background: var(--blue); color: #fff;
    padding: 16px 40px; border-radius: 60px;
    font-weight: 600; font-size: 1rem;
    transition: all 0.3s; display: inline-block;
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
    border: none; cursor: pointer;
}
.btn-primary:hover { background: var(--blue-hover); transform: translateY(-2px); }
.btn-outline {
    background: transparent; color: #fff;
    padding: 16px 40px; border-radius: 60px;
    font-weight: 500; font-size: 1rem;
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s; display: inline-block;
}
.btn-outline:hover { border-color: #fff; background: rgba(255, 255, 255, 0.08); }

.hero-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.stat-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px; padding: 28px 24px; text-align: center;
}
.stat-card .num {
    font-size: 2.3rem; font-weight: 800;
    color: var(--accent); display: block; margin-bottom: 8px;
}
.stat-card p { color: #a8b8d0; font-size: 0.95rem; }

/* ========== 通用区块 ========== */
.section { padding: 90px 0; }
.section-gray { background: var(--bg-gray); }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
    display: inline-block;
    background: #e8f0fe; color: var(--blue);
    padding: 6px 20px; border-radius: 40px;
    font-weight: 600; font-size: 0.85rem; margin-bottom: 16px;
}
.section-title {
    font-size: 2.5rem; font-weight: 700;
    color: var(--navy); margin-bottom: 16px; line-height: 1.3;
}
.section-sub {
    font-size: 1.15rem; color: var(--text-muted);
    max-width: 780px; margin: 0 auto;
}

/* ========== 页面头（内页 banner） ========== */
.page-hero {
    background: linear-gradient(145deg, var(--navy) 0%, var(--navy-3) 100%);
    padding: 72px 0 64px; text-align: center;
    position: relative; overflow: hidden;
}
.page-hero h1 { font-size: 2.8rem; color: #fff; font-weight: 800; margin-bottom: 16px; }
.page-hero p { font-size: 1.15rem; color: #a8b8d0; max-width: 680px; margin: 0 auto; }
.breadcrumb { margin-top: 20px; font-size: 0.9rem; color: #7a8ba8; }
.breadcrumb a { color: #a8b8d0; }
.breadcrumb a:hover { color: #fff; }

/* ========== 痛点网格 ========== */
.pain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pain-card {
    background: #fff; border-radius: var(--radius);
    padding: 32px 28px; border: 1px solid var(--border);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.04);
    transition: all 0.3s;
}
.pain-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px -12px rgba(37, 99, 235, 0.12);
    border-color: #c5d9ff;
}
.pain-num { font-size: 2rem; font-weight: 800; color: #d0ddef; margin-bottom: 16px; }
.pain-card h4 { font-size: 1.2rem; font-weight: 700; color: var(--navy); margin-bottom: 12px; }
.pain-card p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.7; }

/* ========== 核心洞察 ========== */
.insight-box {
    background: linear-gradient(135deg, #f0f5fe 0%, #e8f0fe 100%);
    border-radius: var(--radius-lg);
    padding: 56px 60px; border: 1px solid var(--border-blue);
    text-align: center;
}
.insight-box .big-num {
    font-size: 5rem; font-weight: 800; color: var(--blue);
    line-height: 1; margin-bottom: 20px;
}
.insight-box h3 { font-size: 1.8rem; color: var(--navy); margin-bottom: 20px; }
.insight-box p { font-size: 1.1rem; color: #4a628a; max-width: 760px; margin: 0 auto; line-height: 1.8; }

/* ========== 解决方案卡片 ========== */
.solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.solution-card {
    background: #fff; border-radius: 28px;
    padding: 40px 32px; border: 1px solid var(--border);
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.04);
    transition: all 0.3s; position: relative; overflow: hidden;
}
.solution-card::before {
    content: "";
    position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, var(--blue), var(--blue-light));
}
.solution-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 30px 50px -16px rgba(37, 99, 235, 0.15);
}
.solution-icon { font-size: 2.4rem; margin-bottom: 20px; }
.solution-card h3 { font-size: 1.4rem; font-weight: 700; color: var(--navy); margin-bottom: 16px; }
.solution-card p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.8; margin-bottom: 20px; }
.solution-list li {
    color: #2c3e5c; font-size: 0.9rem;
    padding: 8px 0; display: flex; align-items: flex-start; gap: 10px;
}
.solution-list li::before {
    content: "✓"; color: var(--green); font-weight: 700; flex-shrink: 0;
}

/* ========== 效果流程 ========== */
.flow-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.flow-item {
    background: #fff; border-radius: 20px; padding: 32px 20px;
    text-align: center; border: 1px solid var(--border);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.03);
}
.flow-num {
    width: 48px; height: 48px; margin: 0 auto 18px;
    background: linear-gradient(135deg, var(--blue), var(--blue-light));
    color: #fff; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 1.2rem;
}
.flow-item h4 { font-size: 1.05rem; font-weight: 700; color: var(--navy); margin-bottom: 10px; }
.flow-item p { font-size: 0.85rem; color: var(--text-faint); line-height: 1.6; }

/* ========== 信任锚点 ========== */
.trust-box {
    background: linear-gradient(135deg, #f0f5fe 0%, #e8f0fe 100%);
    border-radius: var(--radius-lg); padding: 50px 48px;
    border: 1px solid var(--border-blue);
}
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; text-align: center; }
.trust-num { font-size: 2.6rem; font-weight: 800; color: var(--blue); display: block; margin-bottom: 10px; }
.trust-item p { color: #4a628a; font-size: 1rem; }

/* ========== 诊断 / 特色卡片 ========== */
.diagnose-box, .feature-grid { border-radius: var(--radius-lg); }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card {
    background: #fff; border-radius: var(--radius);
    padding: 36px 28px; border: 1px solid var(--border);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.04); transition: all 0.3s;
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px -12px rgba(37, 99, 235, 0.12);
    border-color: #c5d9ff;
}
.feature-icon { font-size: 2.2rem; margin-bottom: 18px; }
.feature-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--navy); margin-bottom: 12px; }
.feature-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; }

/* ========== 客户案例卡片 ========== */
.case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.case-card {
    background: #fff; border-radius: 28px; overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.05);
    transition: all 0.3s;
}
.case-card:hover { transform: translateY(-6px); box-shadow: 0 26px 50px -16px rgba(37, 99, 235, 0.15); }
.case-cover {
    height: 200px;
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-3) 100%);
    display: flex; align-items: center; justify-content: center;
    color: rgba(255, 255, 255, 0.35); font-size: 1.2rem; font-weight: 600;
}
.case-body { padding: 30px 28px; }
.case-tag {
    display: inline-block; background: #e8f0fe; color: var(--blue);
    padding: 4px 14px; border-radius: 30px; font-size: 0.8rem; font-weight: 600;
    margin-bottom: 14px;
}
.case-body h3 { font-size: 1.3rem; font-weight: 700; color: var(--navy); margin-bottom: 12px; }
.case-body p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.7; margin-bottom: 20px; }
.case-metrics { display: flex; gap: 28px; padding-top: 20px; border-top: 1px solid var(--border); }
.case-metric .v { font-size: 1.5rem; font-weight: 800; color: var(--blue); }
.case-metric .k { font-size: 0.82rem; color: var(--text-faint); margin-top: 4px; }

/* ========== 关于我们 / 时间线 ========== */
.about-intro { max-width: 820px; margin: 0 auto 60px; text-align: center; }
.about-intro p { font-size: 1.1rem; color: var(--text-muted); line-height: 1.9; }
.timeline { max-width: 760px; margin: 0 auto; position: relative; padding-left: 40px; }
.timeline::before {
    content: ""; position: absolute; left: 12px; top: 8px; bottom: 8px;
    width: 2px; background: var(--border-blue);
}
.timeline-item { position: relative; padding-bottom: 40px; }
.timeline-item::before {
    content: ""; position: absolute; left: -34px; top: 8px;
    width: 12px; height: 12px; border-radius: 50%;
    background: var(--blue); box-shadow: 0 0 0 4px #e8f0fe;
}
.timeline-item .year { font-size: 1.2rem; font-weight: 700; color: var(--blue); margin-bottom: 6px; }
.timeline-item p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.7; }
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.cert-card {
    background: #fff; border-radius: var(--radius);
    padding: 32px 28px; border: 1px solid var(--border);
    text-align: center; box-shadow: 0 10px 28px rgba(0, 0, 0, 0.04);
}
.cert-icon { font-size: 2.4rem; margin-bottom: 16px; }
.cert-card h3 { font-size: 1.1rem; font-weight: 700; color: var(--navy); margin-bottom: 8px; }
.cert-card p { font-size: 0.85rem; color: var(--text-faint); }

/* ========== 资讯列表 ========== */
.article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.article-card {
    background: #fff; border-radius: var(--radius); overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.04);
    transition: all 0.3s; display: block;
}
.article-card:hover { transform: translateY(-6px); box-shadow: 0 20px 40px -12px rgba(37, 99, 235, 0.12); }
.article-cover { height: 160px; background: linear-gradient(135deg, #e8f0fe 0%, #d9e4ff 100%); display: flex; align-items: center; justify-content: center; font-size: 2.6rem; }
.article-body { padding: 24px; }
.article-cat { font-size: 0.78rem; color: var(--blue); font-weight: 600; margin-bottom: 10px; }
.article-body h3 { font-size: 1.1rem; font-weight: 700; color: var(--navy); margin-bottom: 10px; line-height: 1.5; }
.article-body p { font-size: 0.88rem; color: var(--text-faint); line-height: 1.6; margin-bottom: 14px; }
.article-date { font-size: 0.78rem; color: #b0bccf; }

/* ========== 联系页 / 表单 ========== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-info-card {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-3) 100%);
    border-radius: var(--radius-lg); padding: 40px 36px; color: #fff;
}
.contact-info-card h3 { font-size: 1.5rem; margin-bottom: 28px; }
.contact-item { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 22px; }
.contact-item .ico {
    width: 40px; height: 40px; flex-shrink: 0;
    background: rgba(255, 255, 255, 0.1); border-radius: 10px;
    display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
}
.contact-item .label { font-size: 0.82rem; color: #7a8ba8; }
.contact-item .value { font-size: 1rem; color: #fff; line-height: 1.5; }
.contact-item .value a:hover { color: var(--accent); }

.form-card {
    background: #fff; border-radius: var(--radius-lg);
    padding: 40px 36px; border: 1px solid var(--border);
    box-shadow: 0 20px 40px -12px rgba(37, 99, 235, 0.08);
}
.form-card h3 { font-size: 1.4rem; color: var(--navy); margin-bottom: 8px; }
.form-card .form-sub { font-size: 0.9rem; color: var(--text-faint); margin-bottom: 28px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 600; color: var(--navy); margin-bottom: 8px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 13px 16px;
    border: 1.5px solid var(--border); border-radius: 12px;
    font-size: 0.95rem; font-family: inherit; color: var(--text);
    transition: border-color 0.2s; background: #fafcff;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none; border-color: var(--blue); background: #fff;
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-tip { font-size: 0.78rem; color: #b0bccf; margin-top: 6px; }
.form-error { color: #e24b4a; font-size: 0.82rem; margin-top: 6px; display: none; }
.form-group.error input, .form-group.error textarea { border-color: #e24b4a; }
.form-group.error .form-error { display: block; }
.form-submit { width: 100%; padding: 15px; font-size: 1rem; }

/* ========== CTA ========== */
.cta-section {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-3) 100%);
    border-radius: 48px; padding: 70px 60px;
    text-align: center; color: #fff; margin: 40px 0;
}
.cta-section h2 { font-size: 2.6rem; margin-bottom: 20px; font-weight: 700; }
.cta-section p { font-size: 1.2rem; color: #a8b8d0; margin-bottom: 40px; }
.btn-cta-primary {
    background: var(--blue); color: #fff;
    padding: 18px 52px; border-radius: 60px;
    font-weight: 600; font-size: 1.1rem; transition: all 0.3s; display: inline-block;
}
.btn-cta-primary:hover { background: var(--blue-hover); transform: translateY(-3px); }
.cta-wechat { margin-top: 20px; font-size: 0.95rem; color: #7a8ba8; }

/* ========== 页脚 ========== */
.page-footer {
    background: var(--navy); color: #a8b8d0;
    padding: 60px 0 30px; border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-grid {
    display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 50px; margin-bottom: 40px;
}
.footer-logo {
    display: flex; align-items: center; gap: 12px;
    color: #fff; font-size: 1.3rem; font-weight: 700; margin-bottom: 20px;
}
.footer-logo .logo-mark {
    width: 36px; height: 36px;
    background: linear-gradient(135deg, var(--blue), var(--blue-light));
    border-radius: 10px; display: flex; align-items: center; justify-content: center;
    font-size: 1rem; color: #fff;
}
.footer-desc { font-size: 0.9rem; line-height: 1.8; color: #7a8ba8; }
.page-footer h4 { color: #fff; margin-bottom: 20px; font-size: 1rem; font-weight: 600; }
.page-footer li { margin: 12px 0; font-size: 0.9rem; color: #a8b8d0; }
.page-footer a { color: #a8b8d0; font-size: 0.9rem; transition: color 0.2s; }
.page-footer a:hover { color: var(--accent); }
.copyright {
    padding-top: 30px; border-top: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center; font-size: 0.82rem; color: #5a6d8a; line-height: 1.9;
}

/* ========== 移动端底部悬浮栏 ========== */
.mobile-bottom-bar {
    position: fixed; bottom: 0; left: 0; right: 0;
    background: #fff; box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    padding: 10px 16px; display: flex; gap: 10px; z-index: 999;
    padding-bottom: calc(10px + env(safe-area-inset-bottom));
}
.mobile-bottom-bar a {
    flex: 1; padding: 13px 0; border-radius: 60px;
    text-align: center; font-weight: 600; font-size: 0.95rem;
    transition: all 0.2s;
}
.mobile-btn-call { background: var(--blue); color: #fff; }
.mobile-btn-call:active { background: var(--blue-hover); }
.mobile-btn-copy { background: #f0f5fe; color: var(--blue); border: 1px solid var(--border-blue); }

/* 复制提示 toast */
.copy-toast {
    position: fixed; top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.8); color: #fff;
    padding: 14px 28px; border-radius: 12px;
    font-size: 0.9rem; z-index: 9999;
    opacity: 0; transition: opacity 0.3s; pointer-events: none;
}
.copy-toast.show { opacity: 1; }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .container { padding: 0 24px; }
    .hero h1 { font-size: 2.4rem; }
    .hero-grid { grid-template-columns: 1fr; }
    .pain-grid, .solution-grid, .article-grid, .cert-grid { grid-template-columns: 1fr 1fr; }
    .feature-grid { grid-template-columns: 1fr 1fr; }
    .flow-grid { grid-template-columns: repeat(2, 1fr); }
    .trust-grid { grid-template-columns: repeat(2, 1fr); }
    .case-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    :root { --nav-h: 60px; }
    .nav-links {
        display: none; position: absolute; top: var(--nav-h); left: 0; right: 0;
        background: rgba(10, 22, 40, 0.98); flex-direction: column;
        gap: 0; padding: 12px 24px; border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 14px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.06); }
    .nav-links a:last-child { border-bottom: none; }
    .nav-toggle { display: flex; }
    .nav-cta { padding: 8px 18px; font-size: 0.85rem; }

    .hero { padding: 56px 0 48px; }
    .hero h1 { font-size: 1.9rem; }
    .hero-sub { font-size: 0.95rem; }
    .hero-cta { flex-direction: column; }
    .btn-primary, .btn-outline { text-align: center; padding: 15px 32px; }
    .hero-stats { grid-template-columns: 1fr 1fr; gap: 12px; }
    .stat-card .num { font-size: 1.6rem; }

    .section { padding: 56px 0; }
    .section-title { font-size: 1.6rem; }
    .section-sub { font-size: 0.95rem; }
    .section-header { margin-bottom: 36px; }

    .page-hero { padding: 48px 0 44px; }
    .page-hero h1 { font-size: 1.8rem; }

    .pain-grid, .solution-grid, .article-grid, .cert-grid,
    .feature-grid, .flow-grid, .trust-grid { grid-template-columns: 1fr; }
    .case-metrics { flex-wrap: wrap; gap: 16px; }

    .insight-box { padding: 36px 24px; }
    .insight-box .big-num { font-size: 3.4rem; }
    .insight-box h3 { font-size: 1.3rem; }

    .trust-box { padding: 32px 20px; }
    .trust-num { font-size: 1.8rem; }

    .cta-section { padding: 44px 24px; border-radius: 28px; }
    .cta-section h2 { font-size: 1.5rem; }
    .cta-section p { font-size: 0.95rem; }

    .form-card, .contact-info-card { padding: 28px 22px; }
    .form-row { grid-template-columns: 1fr; }

    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .mobile-bottom-bar { display: flex; }
    body { padding-bottom: 76px; }
}

@media (min-width: 769px) {
    .mobile-bottom-bar { display: none; }
}

/* ========== 文章详情页 ========== */
.article-page { max-width: 820px; margin: 0 auto; }
.article-header { padding: 64px 0 36px; text-align: center; }
.article-header .article-cat {
    display: inline-block; background: #e8f0fe; color: var(--blue);
    padding: 5px 18px; border-radius: 30px; font-size: 0.8rem; font-weight: 600;
    margin-bottom: 22px;
}
.article-header h1 {
    font-size: 2.2rem; font-weight: 800; color: var(--navy);
    line-height: 1.35; margin-bottom: 20px;
}
.article-meta {
    color: #b0bccf; font-size: 0.85rem;
    display: flex; gap: 22px; justify-content: center; flex-wrap: wrap;
}
.article-content { font-size: 1.05rem; color: #2c3e5c; line-height: 1.9; }
.article-content .lead {
    font-size: 1.1rem; color: var(--text-muted);
    padding: 22px 26px; background: #f8fafc;
    border-left: 4px solid var(--blue); border-radius: 10px;
    margin-bottom: 30px;
}
.article-content h2 {
    font-size: 1.5rem; font-weight: 700; color: var(--navy);
    margin: 40px 0 16px; padding-left: 14px;
    border-left: 4px solid var(--blue);
}
.article-content h3 { font-size: 1.18rem; font-weight: 700; color: var(--navy); margin: 28px 0 12px; }
.article-content p { margin-bottom: 16px; }
.article-content ul { margin: 0 0 16px 22px; }
.article-content li { margin-bottom: 8px; list-style: disc; }
.article-content strong { color: var(--navy); }
.article-content .callout {
    background: #f0f5fe; border-radius: 12px; padding: 20px 24px;
    color: #2c3e5c; margin: 24px 0; font-size: 1rem;
    border: 1px solid var(--border-blue);
}
.article-footer { margin: 48px 0 16px; }

/* ========== 案例卡片增强 ========== */
.case-cover {
    font-size: 3rem;
    letter-spacing: 2px;
    flex-direction: column;
    gap: 10px;
}
.case-points { margin: 16px 0 20px; }
.case-points li {
    color: #2c3e5c; font-size: 0.9rem; padding: 6px 0;
    display: flex; align-items: flex-start; gap: 10px;
}
.case-points li::before { content: "▸"; color: var(--blue); font-weight: 700; flex-shrink: 0; }
.case-label {
    display: inline-block; font-size: 0.82rem; font-weight: 700; color: var(--blue);
    background: #e8f0fe; padding: 2px 10px; border-radius: 6px; margin-right: 6px;
}

/* ========== 文章详情页响应式 ========== */
@media (max-width: 768px) {
    .article-header { padding: 40px 0 28px; }
    .article-header h1 { font-size: 1.5rem; }
    .article-content { font-size: 0.98rem; }
    .article-content h2 { font-size: 1.25rem; }
}