/* O1M 官网样式 · 简约大气的 B2B 科技风 */
:root {
  --brand: #0b3aa2;
  --brand-dark: #082a7a;
  --accent: #00b4d8;
  --ink: #101828;
  --ink-2: #344054;
  --ink-3: #667085;
  --line: #e4e7ec;
  --bg: #ffffff;
  --bg-alt: #f5f7fb;
  --bg-dark: #0a1e4e;
  --ok: #12b76a;
  --err: #f04438;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(16, 24, 40, 0.08);
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; }
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); }
code {
  font-family: "SFMono-Regular", Consolas, monospace;
  background: #eef2ff;
  color: var(--brand-dark);
  padding: 0.1em 0.45em;
  border-radius: 6px;
  font-size: 0.92em;
  word-break: break-all;
}
.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--brand); color: #fff;
  padding: 8px 16px; z-index: 200;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-block; border: 1px solid transparent; border-radius: 10px;
  padding: 10px 22px; font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all 0.2s ease; font-family: inherit; line-height: 1.4;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); color: #fff; }
.btn-outline { background: #fff; border-color: var(--brand); color: var(--brand); }
.btn-outline:hover { background: #eef2ff; }
.btn-light { background: #fff; color: var(--brand); }
.btn-light:hover { background: #eef2ff; }
.btn-ghost { background: transparent; color: var(--ink-2); }
.btn-ghost:hover { color: var(--brand); background: var(--bg-alt); }
.btn-lg { padding: 14px 30px; font-size: 16px; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

/* ===== 头部 ===== */
.site-header {
  position: sticky; top: 0; z-index: 100; background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 24px; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 800; color: var(--brand); letter-spacing: 0.5px; }
.logo:hover { color: var(--brand-dark); }
.main-nav { display: flex; gap: 4px; margin-left: 8px; flex: 1; }
.main-nav a {
  padding: 8px 13px; border-radius: 8px; color: var(--ink-2); font-size: 15px; font-weight: 500;
}
.main-nav a:hover { background: var(--bg-alt); color: var(--brand); }
.main-nav a.active { color: var(--brand); background: #eef2ff; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.lang-switch {
  font-size: 13px; font-weight: 700; color: var(--ink-2); border: 1px solid var(--line);
  border-radius: 999px; padding: 5px 12px;
}
.lang-switch:hover { border-color: var(--brand); color: var(--brand); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: 0.25s; }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, #f4f7ff 0%, #eef6fb 55%, #f4fbff 100%);
  padding: 84px 0 72px; overflow: hidden;
}
.hero-inner { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px; align-items: center; }
.hero-eyebrow, .eyebrow {
  color: var(--accent); font-weight: 700; font-size: 13px; letter-spacing: 2px;
  text-transform: uppercase; margin-bottom: 14px;
}
.hero h1 { font-size: 46px; line-height: 1.25; letter-spacing: 0.5px; }
.hero h1 em { font-style: normal; color: var(--brand); }
.hero-sub { margin: 22px 0 32px; font-size: 17px; color: var(--ink-2); max-width: 560px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-visual { position: relative; display: flex; justify-content: center; }
.qr-mock {
  width: 240px; height: 240px; background: #fff; border-radius: 20px; box-shadow: var(--shadow);
  padding: 22px; position: relative; overflow: hidden;
}
.qr-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 6px; height: 100%; }
.qr-grid i { background: var(--brand); border-radius: 2px; opacity: 0.9; }
.qr-grid i:nth-child(3n) { opacity: 0.25; }
.qr-grid i:nth-child(7n) { background: var(--accent); opacity: 0.8; }
.scan-line {
  position: absolute; left: 8%; right: 8%; height: 3px; background: var(--accent);
  border-radius: 3px; box-shadow: 0 0 14px var(--accent); animation: scan 2.6s ease-in-out infinite;
}
@keyframes scan { 0%, 100% { top: 10%; } 50% { top: 88%; } }
.hero-badge {
  position: absolute; background: #fff; border-radius: 10px; box-shadow: var(--shadow);
  padding: 9px 16px; font-size: 13px; font-weight: 700; color: var(--ink);
}
.hero-badge.b1 { top: 18px; right: 6px; color: var(--ok); }
.hero-badge.b2 { bottom: 20px; left: 0; color: var(--brand); }

/* ===== 统计条 ===== */
.stats { background: var(--bg-dark); padding: 34px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat { text-align: center; color: #fff; }
.stat strong { display: block; font-size: 32px; font-weight: 800; color: #7fd4ec; }
.stat span { font-size: 14px; color: #b9c6e4; }

/* ===== 通用区块 ===== */
.section { padding: 84px 0; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--bg-dark); color: #fff; }
.section-dark h2 { color: #fff; }
.section-dark .section-head p { color: #b9c6e4; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.section-head h2 { font-size: 34px; line-height: 1.35; margin-bottom: 14px; }
.section-head p { color: var(--ink-3); font-size: 16px; }

.page-hero { background: linear-gradient(135deg, #f4f7ff, #eef6fb); padding: 64px 0; }
.page-hero h1 { font-size: 38px; line-height: 1.3; max-width: 800px; }
.page-hero-sub { margin-top: 16px; font-size: 16px; color: var(--ink-2); max-width: 720px; }

/* ===== 卡片 ===== */
.card-grid { display: grid; gap: 22px; }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; transition: all 0.25s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #d3ddf5; }
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--ink-3); }
.card-icon {
  width: 46px; height: 46px; border-radius: 12px; background: #eef2ff;
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px; color: var(--brand);
}
.card-icon svg { width: 24px; height: 24px; }
.card-num { font-size: 26px; font-weight: 800; color: var(--accent); margin-bottom: 12px; }
.card-industry { border-left: 4px solid var(--brand); }
.section-alt .card { border-color: #e8ecf5; }

/* ===== 步骤 ===== */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; list-style: none; counter-reset: s; }
.steps li { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px; }
.step-n { font-size: 30px; font-weight: 800; color: #c7d6f5; display: block; margin-bottom: 12px; }
.steps h3 { font-size: 17px; margin-bottom: 8px; }
.steps p { font-size: 14px; color: var(--ink-3); }

/* ===== split / GS1 ===== */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split h2 { font-size: 32px; margin-bottom: 16px; }
.split p { color: inherit; opacity: 0.85; margin-bottom: 18px; }
.check-list { list-style: none; margin: 18px 0 26px; }
.check-list li { position: relative; padding-left: 30px; margin-bottom: 10px; }
.check-list li::before {
  content: ""; position: absolute; left: 0; top: 7px; width: 16px; height: 16px;
  border-radius: 50%; background: var(--accent);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpath d='M20 6L9 17l-5-5'/%3E%3C/svg%3E") center/12px no-repeat, linear-gradient(#000,#000);
  -webkit-mask-composite: destination-out; mask-composite: exclude;
}
.code-sample {
  background: #0d2760; border: 1px solid #24458f; border-radius: var(--radius);
  padding: 26px; color: #dbe6ff;
}
.code-sample .code-label { font-size: 12px; letter-spacing: 2px; text-transform: uppercase; color: #7fd4ec; }
.code-sample code { display: block; background: #081c49; color: #9fe3f5; padding: 14px; border-radius: 8px; margin: 12px 0 18px; }
.code-sample ul { list-style: none; }
.code-sample li { padding: 6px 0; border-top: 1px dashed #24458f; font-size: 14px; }
.code-sample b { color: #7fd4ec; margin-right: 8px; }

/* ===== CTA 带 ===== */
.cta-band { background: linear-gradient(120deg, var(--brand) 0%, #1256c4 60%, var(--accent) 130%); color: #fff; padding: 64px 0; }
.cta-inner { text-align: center; }
.cta-inner h2 { font-size: 30px; margin-bottom: 12px; }
.cta-inner p { color: #d6e4ff; margin-bottom: 26px; }

/* ===== 表格 / callout / 架构 ===== */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
.data-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.data-table th, .data-table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--line); }
.data-table th { background: var(--bg-alt); font-weight: 700; }
.data-table tr:last-child td { border-bottom: 0; }
.callout { background: #eef6ff; border-left: 4px solid var(--brand); border-radius: 0 var(--radius) var(--radius) 0; padding: 26px 28px; margin-top: 36px; }
.callout h3 { margin-bottom: 10px; }
.callout p { color: var(--ink-2); font-size: 15px; }
.arch { display: flex; flex-direction: column; gap: 12px; max-width: 860px; margin: 0 auto 40px; }
.arch-layer {
  display: grid; grid-template-columns: 160px 1fr; gap: 18px; align-items: center;
  background: #0d2760; border: 1px solid #24458f; border-radius: 10px; padding: 16px 22px;
}
.arch-name { font-weight: 800; color: #7fd4ec; }
.arch-items { color: #dbe6ff; font-size: 14.5px; }
.api-strip { text-align: center; border-top: 1px dashed #24458f; padding-top: 34px; }
.api-strip h3 { color: #7fd4ec; margin-bottom: 10px; letter-spacing: 2px; }
.api-strip p { color: #b9c6e4; max-width: 640px; margin: 0 auto; }

/* ===== 工具页 ===== */
.tools-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.tool-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; }
.tool-card h2 { font-size: 20px; margin-bottom: 8px; }
.tool-desc { font-size: 14px; color: var(--ink-3); margin-bottom: 18px; }
.tool-row { display: flex; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.tool-row input { flex: 1; min-width: 120px; }
input, textarea {
  border: 1px solid var(--line); border-radius: 10px; padding: 11px 14px; font-size: 15px;
  font-family: inherit; color: var(--ink); width: 100%; background: #fff;
}
input:focus, textarea:focus { outline: 2px solid #b7ccf0; border-color: var(--brand); }
.tool-result { font-size: 14.5px; min-height: 24px; }
.tool-result .ok { color: var(--ok); font-weight: 700; }
.tool-result .err { color: var(--err); font-weight: 700; }
.tool-result table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.tool-result td { padding: 6px 10px; border-bottom: 1px dashed var(--line); font-size: 14px; }
.gen-list { max-height: 220px; overflow: auto; background: var(--bg-alt); border-radius: 8px; padding: 12px; margin-top: 8px; }
.gen-list code { display: block; background: none; padding: 2px 4px; }

/* ===== 防伪查询 ===== */
.verify-wrap { max-width: 860px; }
.verify-form { display: flex; gap: 12px; }
.verify-form input { flex: 1; font-size: 17px; letter-spacing: 1px; }
.verify-demo { margin-top: 12px; font-size: 13.5px; color: var(--ink-3); }
.verify-result { margin: 26px 0; }
.verify-box { border-radius: var(--radius); padding: 26px 28px; border: 1px solid; }
.verify-box.ok { background: #f0fdf6; border-color: #a6e9c5; }
.verify-box.err { background: #fef4f2; border-color: #f6c6bf; }
.verify-box h2 { font-size: 21px; margin-bottom: 8px; }
.verify-box.ok h2 { color: var(--ok); }
.verify-box.err h2 { color: var(--err); }
.verify-box dl { display: grid; grid-template-columns: 120px 1fr; gap: 6px 16px; margin-top: 16px; font-size: 15px; }
.verify-box dt { color: var(--ink-3); }
.verify-box dd { font-weight: 600; }
.verify-notes { margin-top: 44px; }
.verify-notes h2 { font-size: 24px; margin-bottom: 22px; }
.verify-contact { margin-top: 26px; }

/* ===== FAQ ===== */
.faq-list { max-width: 860px; }
.faq-item { border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 14px; background: #fff; }
.faq-item summary {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 20px 24px; cursor: pointer; list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary h2 { font-size: 17px; font-weight: 600; }
.faq-icon { position: relative; width: 18px; height: 18px; flex: none; }
.faq-icon::before, .faq-icon::after {
  content: ""; position: absolute; background: var(--brand); border-radius: 2px;
  top: 8px; left: 0; width: 18px; height: 2px; transition: transform 0.2s;
}
.faq-icon::after { transform: rotate(90deg); }
.faq-item[open] .faq-icon::after { transform: rotate(0); }
.faq-body { padding: 0 24px 22px; color: var(--ink-2); font-size: 15px; }
.faq-more { margin-top: 28px; }

/* ===== 关于我们 ===== */
.stats-inline { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.stats-inline .stat { background: var(--bg-alt); border-radius: var(--radius); padding: 24px; }
.stats-inline .stat strong { color: var(--brand); }
.stats-inline .stat span { color: var(--ink-3); }
.timeline { list-style: none; max-width: 720px; margin: 0 auto; }
.timeline li {
  display: grid; grid-template-columns: 90px 1fr; gap: 24px; padding: 20px 0;
  border-bottom: 1px dashed var(--line); align-items: baseline;
}
.timeline-year { font-size: 22px; font-weight: 800; color: var(--brand); }

/* ===== 联系我们 ===== */
.contact-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: start; }
.contact-form label { display: block; font-size: 14.5px; font-weight: 600; margin-bottom: 16px; }
.contact-form input, .contact-form textarea { margin-top: 6px; font-weight: 400; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-msg { font-size: 14px; margin: 6px 0 14px; min-height: 20px; }
.form-msg.ok { color: var(--ok); }
.form-msg.err { color: var(--err); }
.form-note { margin-top: 14px; font-size: 13px; color: var(--ink-3); }
.side-card { background: var(--bg-alt); border-radius: var(--radius); padding: 26px; margin-bottom: 20px; }
.side-card h2 { font-size: 18px; margin-bottom: 14px; }
.contact-list { list-style: none; }
.contact-list li { display: grid; grid-template-columns: 90px 1fr; gap: 10px; padding: 8px 0; font-size: 15px; }
.contact-list strong { color: var(--ink-3); font-weight: 600; }
.side-hint { font-size: 13.5px; color: var(--ink-3); margin-bottom: 12px; }
.side-card .check-list { margin: 0; }
.side-card .check-list li { font-size: 14.5px; }
.side-card .check-list li::before { top: 6px; }

/* ===== 洞察 ===== */
.article-list { display: grid; gap: 22px; max-width: 860px; }
.article-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; background: #fff; transition: all 0.25s; }
.article-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.article-meta { display: flex; gap: 14px; align-items: center; font-size: 13px; color: var(--ink-3); margin-bottom: 10px; }
.article-cat { background: #eef2ff; color: var(--brand); border-radius: 999px; padding: 3px 12px; font-weight: 600; }
.article-card h2 { font-size: 21px; margin-bottom: 10px; }
.article-card h2 a { color: var(--ink); }
.article-card h2 a:hover { color: var(--brand); }
.article-card p { color: var(--ink-3); font-size: 15px; }
.article-more { display: inline-block; margin-top: 14px; font-weight: 600; font-size: 14.5px; }
.article-detail { max-width: 780px; }
.article-detail h1 { font-size: 32px; line-height: 1.4; margin-bottom: 26px; }
.article-back { margin-top: 36px; }

/* ===== 排版（文章/隐私） ===== */
.prose h2 { font-size: 24px; margin: 34px 0 14px; }
.prose h3 { font-size: 19px; margin: 26px 0 10px; }
.prose p { margin-bottom: 16px; color: var(--ink-2); }
.prose ul, .prose ol { margin: 0 0 16px 22px; color: var(--ink-2); }
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--ink); }

/* ===== 页脚 ===== */
.site-footer { background: #0a1730; color: #b9c6e4; padding: 64px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; padding-bottom: 40px; border-bottom: 1px solid #1c2c52; }
.footer-logo { color: #fff; font-size: 22px; font-weight: 800; margin-bottom: 14px; }
.footer-brand p { font-size: 14px; margin-bottom: 10px; }
.footer-mail a { color: #7fd4ec; }
.footer-col h3 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: #b9c6e4; font-size: 14px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-top: 24px; font-size: 13px; color: #7b8bb3; }

/* ===== 登录弹窗 / 用户中心 ===== */
.auth-modal[hidden], .account-drawer[hidden] { display: none; }
.auth-modal, .account-drawer { position: fixed; inset: 0; z-index: 300; }
.auth-backdrop { position: absolute; inset: 0; background: rgba(10, 20, 40, 0.55); backdrop-filter: blur(2px); }
.auth-panel {
  position: relative; background: #fff; border-radius: 16px; max-width: 420px;
  margin: 8vh auto 0; padding: 34px 32px; box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}
.auth-close {
  position: absolute; top: 12px; right: 14px; background: none; border: 0; font-size: 26px;
  color: var(--ink-3); cursor: pointer; line-height: 1;
}
.auth-panel h2 { font-size: 22px; margin-bottom: 6px; }
.auth-sub { font-size: 13.5px; color: var(--ink-3); margin-bottom: 18px; }
.auth-tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.auth-tab {
  flex: 1; padding: 9px; border: 1px solid var(--line); background: #fff; border-radius: 8px;
  cursor: pointer; font-size: 14.5px; font-weight: 600; color: var(--ink-3); font-family: inherit;
}
.auth-tab.active { border-color: var(--brand); color: var(--brand); background: #eef2ff; }
.auth-form input { margin-bottom: 12px; }
.auth-code-row { display: flex; gap: 10px; }
.auth-code-row input { flex: 1; }
.auth-code-row .btn { flex: none; white-space: nowrap; }
.auth-msg { font-size: 13.5px; min-height: 20px; margin-bottom: 10px; color: var(--err); }
.auth-msg.ok { color: var(--ok); }
.auth-link { display: block; margin: 14px auto 0; background: none; border: 0; color: var(--brand); cursor: pointer; font-size: 14px; font-family: inherit; }
.account-panel {
  position: absolute; right: 0; top: 0; bottom: 0; width: min(420px, 92vw); background: #fff;
  padding: 34px 30px; overflow-y: auto; box-shadow: -10px 0 40px rgba(0, 0, 0, 0.15);
}
.account-user { font-size: 14.5px; color: var(--ink-2); margin: 10px 0 14px; word-break: break-all; }
.account-panel hr { border: 0; border-top: 1px solid var(--line); margin: 22px 0; }
.account-panel h3 { font-size: 17px; margin-bottom: 10px; }
.account-hint { font-size: 13px; color: var(--ink-3); margin-bottom: 14px; }
.account-upload { display: flex; gap: 10px; margin-bottom: 8px; }
.account-upload input { flex: 1; font-size: 13px; padding: 9px 10px; }
.account-upload .btn { flex: none; }
.account-files { list-style: none; margin-top: 14px; }
.account-files li {
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
  padding: 10px 4px; border-bottom: 1px dashed var(--line); font-size: 14px;
}
.account-files .fname { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.account-files button { background: none; border: 0; color: var(--brand); cursor: pointer; font-size: 13px; white-space: nowrap; font-family: inherit; }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .cols-4 { grid-template-columns: repeat(2, 1fr); }
  .cols-3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .hero-inner, .split, .contact-grid { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 26px; }
  .tools-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .main-nav {
    display: none; position: absolute; top: 68px; left: 0; right: 0; background: #fff;
    flex-direction: column; padding: 12px 18px 18px; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }
  .main-nav.open { display: flex; }
  .nav-toggle { display: flex; }
  .header-actions .btn-primary { display: none; }
  .hero { padding: 56px 0 48px; }
  .hero h1 { font-size: 32px; }
  .page-hero h1 { font-size: 28px; }
  .section { padding: 56px 0; }
  .section-head h2 { font-size: 26px; }
  .cols-4, .cols-3, .steps, .form-row, .footer-grid, .stats-inline { grid-template-columns: 1fr; }
  .verify-form { flex-direction: column; }
  .arch-layer { grid-template-columns: 1fr; gap: 6px; }
  .article-detail h1 { font-size: 25px; }
}