/* 网络实验室平台 · 样式
   风格参考 ZCloud 云实验室：浅色底 + 蓝色主色 + 卡片网格 + 顶部渐变 Hero。
   原则：干净克制——细边框、轻圆角、只在 Hero 和主按钮用色块。 */

:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #0f172a;
  --text-2: #64748b;
  --text-3: #94a3b8;
  --line: #e6ebf3;
  --line-2: #f1f5f9;
  --accent: #1557d6;
  --accent-dark: #0f47b3;
  --accent-soft: #eef4ff;
  --cyan: #0ea5e9;
  --ok: #15803d;
  --ok-soft: #f0fdf4;
  --bad: #dc2626;
  --bad-soft: #fef2f2;
  --warn: #b45309;
  --warn-soft: #fffbeb;
  --radius: 12px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.7;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: none; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.main { padding: 26px 0 64px; }
.narrow { max-width: 720px; }

/* ---------------- 顶部导航 ---------------- */
.nav {
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: saturate(180%) blur(10px);
}
.nav-inner { display: flex; align-items: center; gap: 18px; height: 58px; }
.brand { display: flex; align-items: center; gap: 9px; color: var(--text); flex: none; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  color: #fff; font-size: 11px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.brand-text { font-size: 15px; font-weight: 650; }
.nav-links { display: flex; gap: 2px; flex: 1; overflow-x: auto; }
.nav-links a {
  color: var(--text-2); padding: 6px 12px; border-radius: 8px; font-size: 14px;
  white-space: nowrap; font-weight: 500;
}
.nav-links a:hover { background: var(--accent-soft); color: var(--accent-dark); }
.nav-links a.on { color: var(--accent-dark); background: var(--accent-soft); }
.nav-right { display: flex; align-items: center; gap: 8px; flex: none; }
.avatar {
  width: 28px; height: 28px; border-radius: 50%; flex: none;
  background: var(--accent-soft); color: var(--accent-dark);
  font-size: 13px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
}

/* ---------------- Hero ---------------- */
.hero {
  background: linear-gradient(135deg, #0a2557 0%, #1345ab 55%, #1c6fd8 100%);
  color: #fff; padding: 54px 0 46px; margin-bottom: 30px;
}
.hero-tag {
  display: inline-block; font-size: 11px; letter-spacing: .18em; font-weight: 600;
  background: rgba(255, 255, 255, .16); padding: 5px 11px; border-radius: 999px;
  margin-bottom: 16px;
}
.hero h1 { font-size: 32px; line-height: 1.3; margin: 0 0 12px; font-weight: 650; letter-spacing: -.01em; }
.hero-sub { font-size: 15.5px; opacity: .92; margin: 0 0 26px; max-width: 620px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.hero .btn-light { background: #fff; color: var(--accent-dark); border-color: #fff; }
.hero .btn-light:hover { background: #eef4ff; }
.hero .btn-outline { background: rgba(255, 255, 255, .1); color: #fff; border-color: rgba(255, 255, 255, .5); }
.hero .btn-outline:hover { background: rgba(255, 255, 255, .2); }
.hero-stats {
  display: flex; flex-wrap: wrap; gap: 34px; margin-top: 34px;
  padding-top: 24px; border-top: 1px solid rgba(255, 255, 255, .2);
}
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 25px; font-weight: 650; line-height: 1.2; }
.hero-stats span { font-size: 12.5px; opacity: .8; }

/* ---------------- 标签页入口（首页可跳转的大标签）---------------- */
.tabnav {
  display: grid; gap: 12px; grid-template-columns: repeat(2, 1fr);
  margin-bottom: 38px;
}
.tab-card {
  display: flex; align-items: center; gap: 12px; padding: 15px 16px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  color: var(--text); transition: border-color .15s, transform .15s, box-shadow .15s;
}
.tab-card:hover {
  border-color: #bcd0f5; transform: translateY(-2px);
  box-shadow: 0 6px 18px -12px rgba(21, 87, 214, .45);
}
.tab-icon {
  width: 38px; height: 38px; flex: none; border-radius: 10px;
  background: var(--accent-soft); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
}
.tab-icon svg { width: 20px; height: 20px; }
.tab-text { min-width: 0; }
.tab-title { display: block; font-size: 15px; font-weight: 600; }
.tab-desc { display: block; font-size: 12.5px; color: var(--text-2); }

/* ---------------- 区块头 ---------------- */
.section { margin-bottom: 40px; }
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 12px; margin-bottom: 16px;
}
.section-title { font-size: 19px; font-weight: 650; margin: 0; }
.section-more { font-size: 13px; color: var(--accent); }
.section-note { font-size: 13px; color: var(--text-2); margin: -8px 0 16px; }

.grid { display: grid; gap: 14px; grid-template-columns: 1fr; }
.grid-2, .grid-3 { display: grid; gap: 14px; grid-template-columns: 1fr; }

/* ---------------- 卡片 ---------------- */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px; margin-bottom: 14px;
}
.card-link { display: block; color: var(--text); transition: border-color .15s, box-shadow .15s; }
.card-link:hover {
  border-color: #bcd0f5; box-shadow: 0 6px 18px -14px rgba(21, 87, 214, .5);
}
.card h3 { margin: 0 0 8px; font-size: 16.5px; font-weight: 600; }
.card p { margin: 0; color: var(--text-2); font-size: 13.5px; }

.course-card { display: flex; flex-direction: column; gap: 10px; }
.course-cover {
  height: 108px; border-radius: 10px; display: flex; align-items: center; justify-content: center;
  font-size: 34px; background: linear-gradient(135deg, #eaf1ff, #f2f7ff);
}
.course-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 12.5px; color: var(--text-2); }

.badge {
  display: inline-block; font-size: 11.5px; padding: 2px 9px; border-radius: 999px;
  background: var(--line-2); color: var(--text-2); font-weight: 500;
}
.badge-accent { background: var(--accent-soft); color: var(--accent-dark); }
.badge-ok { background: var(--ok-soft); color: var(--ok); }
.badge-bad { background: var(--bad-soft); color: var(--bad); }
.badge-warn { background: var(--warn-soft); color: var(--warn); }

.progress-bar { height: 6px; border-radius: 999px; background: var(--line-2); overflow: hidden; }
.progress-bar i { display: block; height: 100%; background: var(--accent); border-radius: 999px; }

/* ---------------- 列表（社区 / 文件）---------------- */
.list { display: flex; flex-direction: column; }
.list-item {
  display: flex; align-items: center; gap: 14px; padding: 14px 16px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  margin-bottom: 10px; color: var(--text);
}
.list-item:hover { border-color: #bcd0f5; }
.list-body { flex: 1; min-width: 0; }
.list-title { display: block; font-size: 15px; font-weight: 550; }
.list-desc {
  display: block; font-size: 12.5px; color: var(--text-2);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.list-side { flex: none; font-size: 12.5px; color: var(--text-3); text-align: right; }

/* ---------------- 成就 ---------------- */
.achieve-grid { display: grid; gap: 12px; grid-template-columns: repeat(2, 1fr); }
.achieve {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; background: var(--card);
}
.achieve.locked { opacity: .45; }
.achieve-icon { font-size: 22px; }
.achieve-name { display: block; font-size: 14px; font-weight: 600; margin-top: 6px; }
.achieve-desc { display: block; font-size: 12px; color: var(--text-2); }

/* ---------------- 统计条 ---------------- */
.stat-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-bottom: 20px; }
.stat {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px 18px;
}
.stat strong { display: block; font-size: 24px; font-weight: 650; line-height: 1.25; }
.stat span { font-size: 12.5px; color: var(--text-2); }

/* ---------------- 通用文字与工具 ---------------- */
.muted { color: var(--text-2); font-size: 13.5px; }
.hint { color: var(--text-3); font-size: 12.5px; margin: 6px 0 0; }
.center { text-align: center; }
.row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; align-items: center; }
.center-row { justify-content: center; }
.hidden { display: none !important; }
.mt-0 { margin-top: 0; }

.flash {
  background: #f0f9ff; border: 1px solid #bfe3fb; color: #0c4a6e;
  border-radius: var(--radius); padding: 11px 15px; margin-bottom: 16px; font-size: 13.5px;
}
.alert {
  background: var(--bad-soft); border: 1px solid #f5d0d0; color: #991b1b;
  border-radius: var(--radius); padding: 12px 15px; margin-bottom: 16px; font-size: 13.5px;
}
.alert-info { background: var(--accent-soft); border-color: #c9dcfb; color: #1e3a8a; }
.alert-warn { background: var(--warn-soft); border-color: #f5e3b8; color: var(--warn); }

.empty {
  text-align: center; padding: 44px 20px; color: var(--text-3);
  border: 1px dashed var(--line); border-radius: var(--radius); background: #fff;
  font-size: 13.5px;
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 18px; border-radius: 9px; border: 1px solid transparent;
  font-size: 14px; font-weight: 550; font-family: inherit; cursor: pointer;
  background: #fff; color: var(--text); white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { background: #fff; border-color: var(--line); color: var(--text); }
.btn-ghost:hover { border-color: #bcd0f5; color: var(--accent-dark); }
.btn-danger { background: #fff; border-color: #f3c9c9; color: var(--bad); }
.btn-danger:hover { background: var(--bad-soft); }
.btn-lg { padding: 12px 24px; font-size: 15px; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; }

/* ---------------- 表单 ---------------- */
.form .field { margin-bottom: 16px; }
.field label { display: block; font-size: 13.5px; font-weight: 550; margin-bottom: 6px; }
.req { color: var(--bad); font-weight: 400; }
input[type=text], input[type=password], input[type=number], input[type=url], input[type=tel],
input[type=date], input:not([type]), textarea, select {
  width: 100%; padding: 10px 12px; font-size: 15px; font-family: inherit;
  border: 1px solid var(--line); border-radius: 9px; background: #fff; color: var(--text);
}
input:focus, textarea:focus, select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(21, 87, 214, .1);
}
textarea { resize: vertical; }
input[type=file] { font-size: 13.5px; color: var(--text-2); }

/* ---------------- 登录 / 注册 ---------------- */
.auth-wrap { max-width: 400px; margin: 44px auto; }
.auth-card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 30px 26px; }
.auth-card h1 { font-size: 21px; margin: 0 0 6px; font-weight: 650; }
.auth-foot { text-align: center; font-size: 13.5px; color: var(--text-2); margin-top: 18px; }

/* ---------------- 内容区（课程正文）---------------- */
.article { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 28px; }
.article h1, .article h2, .article h3 { line-height: 1.4; margin: 1.3em 0 .6em; font-weight: 650; }
.article h1 { font-size: 22px; } .article h2 { font-size: 19px; } .article h3 { font-size: 16.5px; }
.article p { margin: 0 0 1em; }
.article ul, .article ol { padding-left: 1.4em; margin: 0 0 1em; }
.article img { max-width: 100%; border-radius: 8px; }
.article pre {
  background: #0f172a; color: #e2e8f0; padding: 14px 16px; border-radius: 9px;
  overflow-x: auto; font-size: 13px;
}
.article code { background: var(--line-2); padding: 1px 5px; border-radius: 5px; font-size: 13px; }
.article pre code { background: none; padding: 0; color: inherit; }
.article blockquote {
  margin: 0 0 1em; padding: 2px 16px; border-left: 3px solid var(--line); color: var(--text-2);
}
.article table { width: 100%; border-collapse: collapse; font-size: 14px; margin-bottom: 1em; }
.article th, .article td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }

.course-frame { width: 100%; height: 74vh; min-height: 460px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }

/* ---------------- 编辑器（后台写课程）---------------- */
.editor-bar {
  display: flex; flex-wrap: wrap; gap: 4px; padding: 8px; background: var(--line-2);
  border: 1px solid var(--line); border-bottom: none; border-radius: 9px 9px 0 0;
}
.editor-bar button {
  background: #fff; border: 1px solid var(--line); border-radius: 6px;
  padding: 4px 10px; font-size: 13px; font-family: inherit; cursor: pointer; color: var(--text);
}
.editor-bar button:hover { border-color: #bcd0f5; color: var(--accent-dark); }
.editor-area {
  min-height: 320px; max-height: 60vh; overflow-y: auto; padding: 16px 18px;
  border: 1px solid var(--line); border-radius: 0 0 9px 9px; background: #fff;
}
.editor-area:focus { outline: none; border-color: var(--accent); }
.editor-area:empty:before { content: attr(data-placeholder); color: var(--text-3); }

/* ---------------- 工具栏 / 标签页（后台）---------------- */
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.tb-item { display: flex; flex-direction: column; gap: 6px; font-size: 12.5px; color: var(--text-2); flex: 1 1 170px; }
.tb-search { flex-direction: row; flex-wrap: wrap; align-items: center; gap: 8px; flex: 2 1 340px; }
.tb-search input, .tb-search select { width: auto; min-width: 130px; flex: 1 1 130px; }

.admin-head { margin-bottom: 20px; }
.admin-title-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.admin-title-row h1 { font-size: 20px; font-weight: 650; margin: 0 0 14px; }
.tabs { display: flex; flex-wrap: wrap; gap: 4px; border-bottom: 1px solid var(--line); padding-bottom: 12px; }
.tabs a { font-size: 13.5px; padding: 6px 11px; border-radius: 8px; color: var(--text-2); font-weight: 500; }
.tabs a:hover { background: var(--accent-soft); color: var(--accent-dark); }
.tabs a.on { background: var(--accent-soft); color: var(--accent-dark); font-weight: 600; }
.tabs a.tab-exit { margin-left: auto; color: var(--bad); }

/* ---------------- 表格 ---------------- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { font-size: 12px; color: var(--text-2); font-weight: 600; white-space: nowrap; background: var(--line-2); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: #fafcff; }
.stem-cell { max-width: 380px; }
.ops { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.ops form { display: inline; }
.link { background: none; border: none; padding: 0; font: inherit; color: var(--accent); cursor: pointer; }
.link-danger { color: var(--bad); }
.link:hover { text-decoration: underline; }

/* ---------------- 页脚 ---------------- */
.foot {
  border-top: 1px solid var(--line); background: #fff;
  padding: 26px 0; color: var(--text-2); font-size: 12.5px;
  margin-top: 40px;
}
.foot-inner {
  display: flex; flex-wrap: wrap; gap: 16px 32px;
  align-items: flex-start; justify-content: space-between;
}
.foot-left { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.foot-brand { color: var(--text); font-weight: 600; font-size: 13.5px; }
.foot-sub { color: var(--text-3); }
.foot-meta {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: 2px 8px; color: var(--text-3); margin-top: 2px;
}
.foot-meta > * + *::before { content: "·"; margin-right: 8px; color: var(--line); }
.foot-meta a { color: var(--text-2); }
.foot-meta a:hover { color: var(--accent); }
.foot-copy { color: var(--text-3); }

.foot-right { min-width: 0; }
.foot-links-title { color: var(--text-3); margin-bottom: 6px; letter-spacing: .3px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.foot-links a { color: var(--text-2); }
.foot-links a:hover { color: var(--accent); }

/* ---------------- 页面标题 ---------------- */
.page-head { margin-bottom: 22px; }
.page-head h1 { font-size: 24px; margin: 0 0 8px; font-weight: 650; letter-spacing: -.01em; }
.page-head .muted { max-width: 640px; margin: 0; }

/* ---------------- 首页：招新横幅 ---------------- */
.join-band {
  display: flex; flex-wrap: wrap; gap: 20px 32px; align-items: center;
  justify-content: space-between;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 28px; margin-bottom: 38px;
}
.join-band-text { min-width: 0; flex: 1 1 300px; }
.join-band-title { font-size: 19px; margin: 0 0 8px; font-weight: 650; }
.join-band-desc { margin: 0; color: var(--text-2); font-size: 14px; max-width: 560px; }
.join-band-action { flex: none; }
.join-band-hint { margin: 8px 0 0; font-size: 12.5px; color: var(--text-3); }

/* ---------------- 首页：卖点卡片 ---------------- */
.point-card {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px;
}
.point-no {
  flex: none; font-size: 13px; font-weight: 600; color: var(--accent);
  background: var(--accent-soft); border-radius: 8px; padding: 4px 9px; line-height: 1.5;
}
.point-title { font-size: 15px; margin: 0 0 4px; font-weight: 600; }
.point-desc { margin: 0; font-size: 13.5px; color: var(--text-2); }

/* ---------------- 表单：单选卡片 ---------------- */
.radio-row { display: grid; gap: 10px; grid-template-columns: 1fr; }
.radio-card {
  display: flex; gap: 11px; align-items: flex-start; cursor: pointer;
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 13px 15px; background: #fff; transition: border-color .15s, background .15s;
}
.radio-card:hover { border-color: #bcd0f5; }
.radio-card:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.radio-card input { width: 16px; height: 16px; margin: 3px 0 0; flex: none; }
.radio-text { min-width: 0; }
.radio-title { display: block; font-size: 14.5px; font-weight: 600; }
.radio-desc { display: block; font-size: 12.5px; color: var(--text-2); }
.join-form { max-width: 720px; }

/* ---------------- 结果页 ---------------- */
.center-card { text-align: center; padding: 32px 24px; }
.center-card h1, .center-card h2 { font-size: 20px; margin: 14px 0 8px; font-weight: 650; }
.center-card .muted { max-width: 520px; margin: 0 auto; }
.result-icon {
  width: 46px; height: 46px; margin: 0 auto; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 600;
  background: var(--accent-soft); color: var(--accent-dark);
}
.result-icon.ok { background: var(--ok-soft); color: var(--ok); }
.serial {
  font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size: 17px; color: var(--accent-dark); letter-spacing: .06em;
}
.qrcode {
  display: block; width: 220px; height: 220px; object-fit: contain;
  margin: 18px auto 10px; border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; padding: 8px;
}
.qrcode-preview {
  display: block; width: 150px; height: 150px; object-fit: contain;
  margin-bottom: 10px; border: 1px solid var(--line); border-radius: var(--radius);
  background: #fff; padding: 6px;
}

/* ---------------- 后台：实时数据条 ---------------- */
.live-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 11px 16px; margin-bottom: 18px; font-size: 13px; color: var(--text-2);
}
.live-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--ok); flex: none;
  box-shadow: 0 0 0 0 rgba(21, 128, 61, .5); animation: live-pulse 2s infinite;
}
@keyframes live-pulse {
  0% { box-shadow: 0 0 0 0 rgba(21, 128, 61, .45); }
  70% { box-shadow: 0 0 0 7px rgba(21, 128, 61, 0); }
  100% { box-shadow: 0 0 0 0 rgba(21, 128, 61, 0); }
}
.live-time { margin-left: auto; color: var(--text-3); font-size: 12.5px; }
.live-time b { color: var(--text-2); font-weight: 500; }
.live-toggle {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12.5px; color: var(--text-2); cursor: pointer;
}
.live-toggle input { width: 15px; height: 15px; }
.stat-row-4 { grid-template-columns: repeat(2, 1fr); }

/* ---------------- 后台：筛选条 ---------------- */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 14px;
}
.filter-bar input, .filter-bar select {
  padding: 8px 11px; border: 1px solid var(--line); border-radius: 9px;
  background: #fff; font-size: 13.5px; font-family: inherit; color: var(--text);
}
.filter-bar input { flex: 1 1 220px; min-width: 0; }
.filter-bar select { flex: none; }

/* ---------------- 响应式 ---------------- */
@media (min-width: 620px) {
  .grid-2, .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .tabnav { grid-template-columns: repeat(3, 1fr); }
  .achieve-grid { grid-template-columns: repeat(3, 1fr); }
  .stat-row { grid-template-columns: repeat(4, 1fr); }
  .stat-row-4 { grid-template-columns: repeat(4, 1fr); }
  .radio-row { grid-template-columns: repeat(2, 1fr); }
  .foot-right { text-align: right; }
  .foot-links { justify-content: flex-end; }
}
@media (min-width: 900px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .tabnav { grid-template-columns: repeat(6, 1fr); }
  .tab-card { flex-direction: column; align-items: flex-start; gap: 10px; }
  .hero { padding: 72px 0 60px; }
  .hero h1 { font-size: 40px; }
  .achieve-grid { grid-template-columns: repeat(6, 1fr); }
  .stat-row { grid-template-columns: repeat(6, 1fr); }
  .stat-row-4 { grid-template-columns: repeat(4, 1fr); }
}