:root {
  --primary: #1677ff;
  --primary-dark: #0a5bd3;
  --primary-light: #e8f1ff;
  --accent: #0a7fff;
  --bg: #f5f7f9;
  --card: #ffffff;
  --text: #1f2933;
  --text-2: #52606d;
  --text-3: #7b8794;
  --border: #e4e9ee;
  --danger: #d64545;
  --shadow: 0 2px 8px rgba(10, 40, 90, 0.06);
  --shadow-lg: 0 8px 28px rgba(10, 40, 90, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.hidden { display: none !important; }

/* ===== 头部 ===== */
.site-header {
  background: linear-gradient(135deg, #0a2e5c 0%, #0a5bd3 60%, #1677ff 100%);
  color: #fff;
  position: sticky; top: 0; z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
}
.header-inner {
  max-width: 1180px; margin: 0 auto; padding: 12px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.brand { display: flex; align-items: center; gap: 12px; cursor: pointer; }
.brand-logo { color: #bfd9ff; display: flex; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 20px; letter-spacing: 1px; }
.brand-text em { font-style: normal; font-size: 12px; opacity: 0.85; }
.main-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav-item {
  color: rgba(255,255,255,0.88); padding: 8px 16px; border-radius: 8px;
  cursor: pointer; font-size: 15px; transition: all 0.18s; white-space: nowrap;
}
.nav-item:hover { background: rgba(255,255,255,0.14); color: #fff; }
.nav-item.active { background: rgba(255,255,255,0.22); color: #fff; font-weight: 600; }

/* ===== 主体 ===== */
.container { max-width: 1180px; margin: 0 auto; padding: 28px 24px 60px; min-height: 60vh; }
.view { display: none; }
.view.active { display: block; animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ===== 首页 Hero ===== */
.hero {
  background: linear-gradient(120deg, #0a5bd3, #1677ff 70%, #4096ff);
  color: #fff; border-radius: 18px; padding: 46px 44px; margin-bottom: 24px;
  box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -60px; top: -60px; width: 260px; height: 260px;
  border-radius: 50%; background: rgba(255,255,255,0.08);
}
.hero h1 { font-size: 34px; margin-bottom: 12px; letter-spacing: 1px; }
.hero-sub { font-size: 16px; opacity: 0.95; max-width: 620px; margin-bottom: 24px; }
.hero-sub strong { font-size: 20px; }
.hero-actions { display: flex; gap: 12px; }

/* ===== 按钮 ===== */
.btn {
  border: none; border-radius: 8px; padding: 11px 22px; font-size: 15px;
  cursor: pointer; transition: all 0.18s; font-weight: 500; display: inline-flex; align-items: center; gap: 6px;
}
.btn-primary { background: #fff; color: var(--primary-dark); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(0,0,0,0.18); }
.btn-outline { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,0.8); }
.btn-outline:hover { background: rgba(255,255,255,0.15); }
.btn-ghost { background: #eef1f4; color: var(--text-2); }
.btn-ghost:hover { background: #e2e7eb; }

/* ===== 统计卡片 ===== */
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 32px; }
.stat-card {
  background: var(--card); border-radius: var(--radius); padding: 22px;
  box-shadow: var(--shadow); border: 1px solid var(--border); text-align: center;
}
.stat-num { font-size: 30px; font-weight: 700; color: var(--primary); }
.stat-label { color: var(--text-2); font-size: 13px; margin-top: 4px; }

/* ===== 区块 ===== */
.home-section { margin-top: 8px; }
.home-section h2 { font-size: 20px; margin-bottom: 16px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; cursor: pointer; transition: all 0.2s; box-shadow: var(--shadow);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: #c9dcff; }
.feature-icon { font-size: 28px; color: var(--primary); margin-bottom: 10px; }
.feature-card h3 { font-size: 18px; margin-bottom: 8px; }
.feature-card p { color: var(--text-2); font-size: 14px; }

/* ===== 页面头 ===== */
.page-head { margin-bottom: 22px; }
.page-head h1 { font-size: 26px; margin-bottom: 6px; }
.page-head p { color: var(--text-2); }

/* ===== 步骤条 ===== */
.stepper { display: flex; align-items: center; margin-bottom: 24px; }
.step { display: flex; align-items: center; gap: 8px; color: var(--text-3); }
.step-dot {
  width: 30px; height: 30px; border-radius: 50%; background: #e2e7eb; color: #8a96a3;
  display: flex; align-items: center; justify-content: center; font-weight: 600; font-size: 14px;
}
.step-txt { font-size: 14px; }
.step.active { color: var(--primary-dark); }
.step.active .step-dot { background: var(--primary); color: #fff; }
.step.done { color: var(--primary); }
.step.done .step-dot { background: var(--primary-light); color: var(--primary); }
.step-line { flex: 1; height: 2px; background: #e2e7eb; margin: 0 14px; }

/* ===== 搜索框 ===== */
.search-bar { margin-bottom: 18px; }
.search-bar input {
  width: 100%; padding: 13px 18px; border: 1.5px solid var(--border); border-radius: 10px;
  font-size: 15px; background: var(--card); transition: border 0.15s;
}
.search-bar input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(22,119,255,0.12); }

/* ===== 选项 chips ===== */
.chip-group { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  padding: 10px 18px; border-radius: 20px; background: var(--card); border: 1.5px solid var(--border);
  cursor: pointer; font-size: 14px; transition: all 0.16s; user-select: none;
}
.chip:hover { border-color: var(--primary); color: var(--primary); }
.chip.selected { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.chip .chip-sub { font-size: 12px; opacity: 0.7; margin-left: 4px; }

/* ===== 面包屑 ===== */
.sel-breadcrumb {
  background: var(--primary-light); border-radius: var(--radius-sm); padding: 12px 16px;
  margin-bottom: 18px; font-size: 14px; color: var(--primary-dark);
}
.sel-breadcrumb b { font-size: 16px; }

/* ===== 面板 ===== */
.panel { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.rev-panel { max-width: 880px; }
.form-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 20px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field span { font-size: 13px; color: var(--text-2); }
.field span i { font-style: italic; color: var(--primary); }
.field span em { font-style: normal; color: var(--text-3); font-size: 12px; }
.field input, .field select {
  padding: 12px 14px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 15px;
  background: #fff; transition: border 0.15s;
}
.field input:focus, .field select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(22,119,255,0.12); }
.form-actions { display: flex; gap: 12px; }

/* ===== 进度条 ===== */
.progress-wrap { margin: 18px 0 6px; }
.progress-bar {
  width: 100%; height: 10px; background: #e6edf4; border-radius: 6px; overflow: hidden;
}
.progress-fill {
  height: 100%; width: 0%; background: linear-gradient(90deg, #1677ff, #0a7fff);
  border-radius: 6px; transition: width 0.25s ease;
}
.progress-text {
  margin-top: 8px; font-size: 13px; color: var(--text-2); text-align: center;
}

/* ===== 结果汇总 ===== */
.result-summary {
  margin: 20px 0 14px; padding: 14px 18px; background: var(--primary-light);
  border-radius: var(--radius-sm); color: var(--primary-dark); font-size: 14px;
}

/* ===== 表格 ===== */
.table-wrap { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: auto; box-shadow: var(--shadow); }
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 820px; }
.data-table th, .data-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); }
.data-table thead th { background: #f0f4f7; color: var(--text-2); font-weight: 600; font-size: 13px; white-space: nowrap; }
.data-table tbody tr:hover { background: #f8faff; }
.data-table td.num { font-variant-numeric: tabular-nums; }
.data-table thead th.sortable { cursor: pointer; user-select: none; }
.data-table thead th.sortable:hover { color: var(--primary); background: #e6eef7; }
.data-table thead th.sortable .sort-arrow { display: inline-block; margin-left: 4px; font-size: 11px; color: var(--primary); }
.match-badge { display: inline-block; padding: 3px 10px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.match-badge.good { background: #e8f1ff; color: var(--primary-dark); }
.match-badge.mid { background: #fff4e0; color: #b07818; }
.match-badge.far { background: #fdeaea; color: var(--danger); }
.link-btn { color: var(--primary); cursor: pointer; font-size: 13px; white-space: nowrap; }
.link-btn:hover { text-decoration: underline; }

/* ===== 产品卡片（样本选型结果） ===== */
.prod-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.prod-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow); transition: all 0.18s;
}
.prod-card:hover { box-shadow: var(--shadow-lg); border-color: #c9dcff; }
.prod-card .pc-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.prod-card .pc-title { font-size: 17px; font-weight: 700; }
.prod-card .pc-tag { font-size: 12px; color: var(--primary); background: var(--primary-light); padding: 3px 10px; border-radius: 12px; }
.prod-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; font-size: 13px; color: var(--text-2); }
.prod-meta div b { color: var(--text); font-weight: 600; }
.coeff-row { display: flex; gap: 10px; margin-top: 14px; }
.coeff-box { flex: 1; background: #f6f9ff; border-radius: var(--radius-sm); padding: 10px; text-align: center; }
.coeff-box .cv { font-size: 19px; font-weight: 700; color: var(--primary-dark); font-variant-numeric: tabular-nums; }
.coeff-box .ck { font-size: 11px; color: var(--text-3); margin-top: 2px; }

/* ===== 系列卡片网格 ===== */
.series-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px; }
.series-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; cursor: pointer; transition: all 0.18s; box-shadow: var(--shadow);
}
.series-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: #c9dcff; }
.series-card .sc-name { font-size: 18px; font-weight: 700; color: var(--primary-dark); }
.series-card .sc-meta { font-size: 12px; color: var(--text-3); margin-top: 6px; line-height: 1.5; }
.series-card .sc-count { margin-top: 10px; font-size: 12px; color: var(--primary); font-weight: 600; }

/* ===== 弹窗 ===== */
.modal-mask {
  position: fixed; inset: 0; background: rgba(15,30,25,0.5); z-index: 200;
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.modal {
  background: var(--card); border-radius: 16px; max-width: 860px; width: 100%;
  max-height: 86vh; display: flex; flex-direction: column; box-shadow: var(--shadow-lg);
  animation: modalIn 0.2s ease;
}
@keyframes modalIn { from { opacity: 0; transform: scale(0.96); } to { opacity: 1; transform: none; } }
.modal-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 24px; border-bottom: 1px solid var(--border);
}
.modal-head h2 { font-size: 20px; }
.modal-close {
  border: none; background: #f0f4f7; width: 34px; height: 34px; border-radius: 50%;
  font-size: 20px; cursor: pointer; color: var(--text-2); line-height: 1;
}
.modal-close:hover { background: #e2e7eb; }
.modal-body { padding: 22px 24px; overflow-y: auto; }

/* ===== API 文档 ===== */
.api-doc { display: flex; flex-direction: column; gap: 16px; }
.api-item { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.api-item .api-method {
  display: inline-block; padding: 3px 10px; border-radius: 6px; font-size: 12px; font-weight: 700;
  background: var(--primary); color: #fff; margin-right: 10px;
}
.api-item .api-path { font-family: "SF Mono", Consolas, monospace; font-size: 15px; color: var(--text); font-weight: 600; }
.api-item .api-desc { color: var(--text-2); font-size: 14px; margin: 8px 0; }
.api-item pre {
  background: #0a1a33; color: #cfe0ff; padding: 14px 16px; border-radius: 8px;
  font-family: "SF Mono", Consolas, monospace; font-size: 13px; overflow-x: auto; line-height: 1.7;
}

/* ===== 页脚 ===== */
.site-footer { background: #0a1f3d; color: #cfe0ff; margin-top: 40px; }
.footer-inner {
  max-width: 1180px; margin: 0 auto; padding: 36px 24px 24px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.footer-col strong { font-size: 17px; color: #fff; display: block; margin-bottom: 8px; }
.footer-col h4 { font-size: 14px; color: #fff; margin-bottom: 8px; }
.footer-col p { font-size: 13px; opacity: 0.85; line-height: 1.8; }
.footer-col .ph { color: #bfd9ff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 16px 24px; text-align: center; }
.footer-bottom p { font-size: 12px; opacity: 0.6; }

/* ===== 空状态 ===== */
.empty { text-align: center; color: var(--text-3); padding: 40px 20px; }
.empty .empty-icon { font-size: 40px; margin-bottom: 10px; }

/* ===== 有因次换算结果 ===== */
.dim-section { margin-top: 14px; border-top: 1px dashed var(--border); padding-top: 12px; }
.dim-section .dim-title { font-size: 12px; color: var(--text-3); margin-bottom: 8px; }
.dim-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.dim-table th, .dim-table td { padding: 6px 10px; text-align: center; border-bottom: 1px solid var(--border); }
.dim-table thead th { background: #f0f4f7; color: var(--text-2); font-weight: 600; font-size: 12px; }
.dim-table td { font-variant-numeric: tabular-nums; }
.dim-table td.hl { color: var(--primary-dark); font-weight: 700; }

/* ===== 性能曲线 ===== */
.curve-box {
  background: #fbfdff; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px; margin-top: 16px; position: relative;
}
.curve-box .curve-title { font-size: 14px; font-weight: 600; margin-bottom: 4px; color: var(--text); }
.curve-box .curve-sub { font-size: 12px; color: var(--text-3); margin-bottom: 10px; }
.curve-tabs { display: flex; gap: 6px; margin-bottom: 10px; }
.curve-tab {
  padding: 5px 14px; border-radius: 14px; border: 1px solid var(--border);
  background: #fff; font-size: 12px; cursor: pointer; transition: all 0.15s;
}
.curve-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.curve-canvas { width: 100%; height: auto; display: block; }

/* 曲线悬停数值提示框 */
.curve-hover-tip {
  position: absolute; z-index: 20; pointer-events: none;
  display: none; min-width: 132px;
  background: #fff; border: 1px solid var(--border);
  border-radius: 8px; box-shadow: 0 6px 20px rgba(16, 24, 40, 0.14);
  padding: 8px 10px; font-size: 12px; line-height: 1.7;
}
.curve-hover-tip .ct-row { display: flex; justify-content: space-between; gap: 14px; white-space: nowrap; }
.curve-hover-tip .ct-label { color: var(--text-3); }
.curve-hover-tip .ct-val { font-weight: 600; color: var(--text); font-variant-numeric: tabular-nums; }

/* ===== PDF 按钮 ===== */
.pdf-btn {
  background: var(--danger); color: #fff; border: none; border-radius: 8px;
  padding: 9px 18px; font-size: 14px; cursor: pointer; font-weight: 500;
  display: inline-flex; align-items: center; gap: 6px; transition: all 0.18s;
}
.pdf-btn:hover { background: #c0392b; transform: translateY(-1px); }
.pdf-btn:disabled { opacity: 0.6; cursor: not-allowed; }
.modal-actions { display: flex; gap: 10px; }

/* ===== 换算公式说明 ===== */
.formula-note {
  background: #eef4ff; border: 1px solid #d6e4ff; border-radius: var(--radius-sm);
  padding: 12px 16px; font-size: 12px; color: var(--text-2); line-height: 1.9; margin-top: 12px;
}
.formula-note code { font-family: "SF Mono", Consolas, monospace; color: var(--primary-dark); }

/* ===== 参数选型专业界面 ===== */
.rev-layout { display: grid; grid-template-columns: 300px 1fr; gap: 20px; align-items: start; }
.rev-side { position: sticky; top: 80px; }
.rev-side-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.rev-side-head h3 { font-size: 16px; }
.rev-side-actions { display: flex; gap: 12px; }
.rev-model-list {
  max-height: 460px; overflow-y: auto; border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 6px; display: flex; flex-direction: column; gap: 2px;
}
.model-check {
  display: flex; align-items: center; gap: 8px; padding: 6px 10px;
  border-radius: 6px; font-size: 13px; cursor: pointer;
  transition: all 0.12s; background: #fff; user-select: none;
}
.model-check:hover { background: #eef4ff; }
.model-check input { cursor: pointer; }
.model-check.checked { background: var(--primary-light); color: var(--primary-dark); font-weight: 600; }
.check-field { display: flex; flex-direction: row; align-items: center; gap: 8px; padding-top: 22px; }
.check-field input { width: 18px; height: 18px; cursor: pointer; }

.form-group-title {
  font-size: 15px; color: var(--primary-dark); margin: 18px 0 12px;
  padding-bottom: 8px; border-bottom: 1px solid var(--border);
}
.form-group-title:first-child { margin-top: 0; }
.form-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px 16px; }
.form-grid.three { grid-template-columns: repeat(4, 1fr); }
.form-grid.two { grid-template-columns: repeat(2, 1fr); }
.auto-tag {
  font-style: normal; font-size: 11px; color: var(--primary); background: var(--primary-light);
  padding: 1px 7px; border-radius: 8px; margin-left: 4px;
}

/* ===== 产品详情区块（按截图样式） ===== */
.section-block { margin-top: 18px; }
.section-block:first-child { margin-top: 0; }
.section-title {
  font-size: 14px; font-weight: 600; color: var(--primary-dark); margin-bottom: 10px;
  padding: 6px 12px; background: var(--primary-light); border-left: 3px solid var(--primary);
  border-radius: 4px;
}
.param-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 32px; padding: 4px 8px; }
.param-col > div { font-size: 13px; color: var(--text); padding: 4px 0; line-height: 1.7; }
.param-col b { color: var(--text-2); font-weight: 500; margin-right: 4px; }

/* ===== 选型详情独立页 ===== */
.detail-topbar { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.detail-topbar h1 { font-size: 24px; margin: 0; }
.detail-topbar p { color: var(--text-2); }
.detail-actions { display: flex; gap: 10px; margin-top: 16px; }
.curve-legend-hint { font-size: 12px; color: var(--text-3); margin-top: 6px; }

/* ===== 数据管理 ===== */
.admin-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 18px; }
.admin-stat {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px; text-align: center; box-shadow: var(--shadow);
}
.as-num { font-size: 24px; font-weight: 700; color: var(--primary); font-variant-numeric: tabular-nums; }
.as-label { font-size: 12px; color: var(--text-2); margin-top: 2px; }

.admin-toolbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 16px; flex-wrap: wrap; gap: 12px;
}
.admin-tabs { display: flex; gap: 4px; background: #eef1f4; padding: 4px; border-radius: 10px; }
.admin-tab {
  border: none; background: transparent; padding: 8px 20px; border-radius: 8px;
  font-size: 14px; cursor: pointer; color: var(--text-2); font-weight: 500; transition: all 0.15s;
}
.admin-tab.active { background: var(--primary); color: #fff; }
.admin-actions { display: flex; gap: 10px; align-items: center; }

.admin-panel {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
}
.admin-filter { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; align-items: center; }
.admin-filter input, .admin-filter select {
  padding: 10px 14px; border: 1.5px solid var(--border); border-radius: 8px;
  font-size: 14px; background: #fff; color: var(--text);
}
.admin-filter input { flex: 1; min-width: 200px; }
.admin-filter input:focus, .admin-filter select:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(22,119,255,0.12);
}

.admin-table { min-width: 680px; }
.admin-ops { display: flex; gap: 12px; white-space: nowrap; }
.link-btn.danger { color: var(--danger); }

.admin-pager { display: flex; align-items: center; justify-content: flex-end; gap: 12px; margin-top: 14px; }
.pager-info { font-size: 13px; color: var(--text-2); }

.admin-subtitle {
  font-size: 14px; color: var(--primary-dark); margin: 20px 0 10px;
  padding-bottom: 8px; border-bottom: 1px solid var(--border);
}
.modal-lg { max-width: 980px; }

/* 曲线点编辑表格 */
.curve-row td { padding: 6px 8px; }
.curve-row input {
  width: 100%; padding: 8px 10px; border: 1.5px solid var(--border); border-radius: 6px;
  font-size: 13px; background: #fff; min-width: 70px;
}
.curve-row input:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(22,119,255,0.12);
}
.curve-row .btn { padding: 6px 12px; font-size: 12px; }

/* ===== 响应式 ===== */
@media (max-width: 760px) {
  .header-inner { flex-direction: column; gap: 10px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .hero { padding: 30px 24px; }
  .hero h1 { font-size: 26px; }
}