/* ============================================================
   EasyPictureMarker 官网样式表
   层级：website/assets/css/style.css （表现层 / presentation）
   说明：纯静态站点，无构建依赖，直接由 index.html 引用。
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --brand-deep: #1e40af;
  --brand-soft: #eef4ff;
  --accent: #f59e0b;
  --cyan: #06b6d4;
  --ink: #0f172a;
  --ink-2: #334155;
  --ink-3: #64748b;
  --ink-4: #94a3b8;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-soft: #f7f9fc;
  --bg-mist: #f4f8fc;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06), 0 1px 3px rgba(15, 23, 42, .04);
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, .16);
  --shadow-brand: 0 14px 34px rgba(37, 99, 235, .28);
  --maxw: 1200px;
  --nav-h: 68px;
}

/* ---------- 2. 基础重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink);
  line-height: 1.28;
  letter-spacing: -.01em;
  font-weight: 800;
}

p { margin: 0; }

a {
  color: var(--brand);
  text-decoration: none;
  transition: color .18s ease;
}

a:hover { color: var(--brand-dark); }

img { max-width: 100%; display: block; }

ul { margin: 0; padding: 0; list-style: none; }

button { font: inherit; }

::selection {
  background: rgba(37, 99, 235, .18);
  color: var(--ink);
}

/* ---------- 3. 布局骨架 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 96px 0; }

.section--soft {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section--tight { padding: 72px 0; }

/* ---------- 4. 通用元件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
}

.section-head {
  max-width: 760px;
  margin: 0 auto 56px;
  text-align: center;
}

.section-head h2 {
  margin: 18px 0 14px;
  font-size: clamp(28px, 3.4vw, 40px);
}

.section-head p {
  font-size: 17px;
  color: var(--ink-3);
}

.tag-line {
  color: var(--brand);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
}

.btn svg { width: 18px; height: 18px; }

.btn:hover { transform: translateY(-2px); }

.btn:active { transform: translateY(0); }

.btn-primary {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
  color: #fff;
  box-shadow: var(--shadow-brand);
}

.btn-primary:hover {
  color: #fff;
  box-shadow: 0 18px 40px rgba(37, 99, 235, .38);
}

.btn-ghost {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}

.btn-ghost:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.btn-light {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}

.btn-light:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.btn-lg { padding: 16px 34px; font-size: 16.5px; }

.btn-sm { padding: 9px 18px; font-size: 14px; }

/* ---------- 5. 顶部导航 ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: box-shadow .25s ease;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .93);
  backdrop-filter: saturate(160%) blur(10px);
}

.nav.is-solid { box-shadow: 0 2px 16px rgba(15, 23, 42, .07); }

.nav .wrap {
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
  color: var(--ink);
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
  display: grid;
  place-items: center;
  box-shadow: 0 6px 18px rgba(37, 99, 235, .35);
}

.brand-mark svg { width: 21px; height: 21px; color: #fff; }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text b {
  font-size: 17.5px;
  font-weight: 800;
  letter-spacing: -.02em;
}

.brand-text span {
  font-size: 11px;
  opacity: .72;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav-links a {
  position: relative;
  padding: 8px 13px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-2);
}

.nav-links a:hover { color: var(--brand); }

.nav-links a.is-active {
  color: var(--brand);
  background: var(--brand-soft);
}

.nav-cta { display: flex; align-items: center; gap: 10px; }

.nav-ver {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-3);
  letter-spacing: .03em;
}

.burger {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
  padding: 0;
  place-items: center;
}

.burger span,
.burger span::before,
.burger span::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .25s ease, opacity .2s ease;
}

.burger span::before,
.burger span::after { content: ""; position: absolute; }

.burger span { position: relative; }
.burger span::before { top: -6px; }
.burger span::after { top: 6px; }

.burger.is-open span { background: transparent; }
.burger.is-open span::before { transform: translateY(6px) rotate(45deg); }
.burger.is-open span::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 6. Hero ---------- */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + 76px) 0 0;
  background: linear-gradient(180deg, #f2f6fa 0%, #ffffff 64%);
  color: var(--ink-2);
  overflow: hidden;
}

/* 底纹只用一层极淡网格，不用大面积模糊光斑 */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(15, 23, 42, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, .035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 78% 62% at 50% 24%, #000 32%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 78% 62% at 50% 24%, #000 32%, transparent 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
  padding-bottom: 96px;
}

.hero-copy { max-width: 620px; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 15px 7px 9px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--ink-3);
  margin-bottom: 26px;
  box-shadow: var(--shadow-sm);
}

.hero-badge b {
  padding: 2px 9px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}

.hero h1 {
  font-size: clamp(34px, 4.6vw, 56px);
  color: var(--ink);
  letter-spacing: -.02em;
}

/* 荧光笔式高亮：比渐变文字更克制、更"人手做的" */
.hero h1 em {
  font-style: normal;
  color: var(--ink);
  box-shadow: inset 0 -.42em 0 rgba(37, 99, 235, .16);
}

.hero-lead {
  margin: 22px 0 34px;
  font-size: clamp(16.5px, 1.5vw, 19px);
  color: var(--ink-3);
}

.hero-lead b { color: var(--ink); font-weight: 700; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.hero-note {
  margin-top: 18px;
  font-size: 13.5px;
  color: var(--ink-4);
}

.hero-stats {
  display: flex;
  gap: 38px;
  margin-top: 44px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}

.hero-stat b {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: var(--brand-dark);
  letter-spacing: -.02em;
}

.hero-stat span {
  font-size: 13.5px;
  color: var(--ink-3);
}

/* ---------- 7. 截图占位通用组件 ---------- */
.shot {
  position: relative;
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: #fbfcfe;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.shot img {
  width: 100%;
  height: auto;
  display: block;
}

.shot-frame {
  position: relative;
  aspect-ratio: 16 / 10;
  width: 100%;
}

.shot-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 缺图占位态 */
.ph {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 22px;
  text-align: center;
  background:
    repeating-linear-gradient(45deg, #f4f7fb 0 12px, #eef3f9 12px 24px);
  border: 2px dashed #c3d0e0;
  border-radius: var(--radius);
  color: #6d8298;
}

.ph-icon { opacity: .55; }
.ph-icon svg { width: 42px; height: 42px; }

.ph-title {
  font-size: 15.5px;
  font-weight: 700;
  color: #40536a;
}

.ph-desc {
  font-size: 12.5px;
  line-height: 1.6;
  max-width: 90%;
  color: #77899e;
}

.ph-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11.5px;
  padding: 3px 9px;
  border-radius: 6px;
  background: #fff;
  border: 1px solid #d7e0ea;
  color: #557;
}

.shot img { position: relative; z-index: 1; }

/* Hero 大图：浏览器窗口外框 */
.shot-app {
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, .14);
}

.shot-app-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 11px 14px;
  background: #eef1f6;
  border-bottom: 1px solid #e2e6ec;
}

.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.r { background: #ff5f57; }
.dot.y { background: #febc2e; }
.dot.g { background: #28c840; }

.shot-app-title {
  margin-left: 10px;
  font-size: 12px;
  color: #7b8798;
  letter-spacing: .02em;
}

.shot-app .shot-frame { aspect-ratio: 16 / 10.4; }

.shot-app .ph { border-radius: 0; border-style: dashed; }

.hero-shot-wrap { position: relative; }

.hero-shot-wrap::before {
  content: "";
  position: absolute;
  inset: -22px -16px -16px 16px;
  border-radius: 22px;
  background: rgba(37, 99, 235, .10);
  filter: blur(26px);
  z-index: -1;
}

/* 工具演示的假 UI（纯 CSS，无截图时的体面兜底） */
.mock-ui {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 54px 1fr 138px;
  grid-template-rows: 30px 1fr;
  background: #f2f5f9;
  font-size: 10px;
  color: #93a3b6;
}

.mock-ui .m-bar {
  grid-column: 1 / -1;
  background: #fff;
  border-bottom: 1px solid #e3e9f0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
}

.mock-ui .m-bar i {
  display: block;
  height: 7px;
  width: 46px;
  border-radius: 3px;
  background: #e7edf4;
}

.mock-ui .m-bar i:nth-child(2) { width: 30px; }
.mock-ui .m-bar i:nth-child(3) { width: 60px; background: #dbe6f5; }

.mock-ui .m-tools {
  background: #fff;
  border-right: 1px solid #e3e9f0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-auto-rows: 22px;
  gap: 4px;
  padding: 7px 6px;
  align-content: start;
}

.mock-ui .m-tools i {
  border-radius: 5px;
  background: #eef3f9;
}

.mock-ui .m-tools i:nth-child(3n) { background: #d8e6fa; }

.mock-ui .m-canvas {
  position: relative;
  margin: 14px;
  background: #fff;
  border: 1px solid #dbe3ec;
  box-shadow: 0 4px 14px rgba(15, 23, 42, .07);
  overflow: hidden;
}

.mock-ui .m-canvas::before {
  content: "";
  position: absolute;
  inset: 22% 16%;
  border: 2px solid #2563eb;
  border-radius: 4px;
  background: rgba(37, 99, 235, .05);
}

.mock-ui .m-canvas::after {
  content: "";
  position: absolute;
  left: 62%;
  top: 30%;
  width: 26%;
  height: 30%;
  border: 2px dashed #f59e0b;
  border-radius: 4px;
  background: rgba(245, 158, 11, .08);
}

.mock-ui .m-side {
  background: #fff;
  border-left: 1px solid #e3e9f0;
  padding: 8px 7px;
  display: grid;
  grid-auto-rows: 18px;
  gap: 5px;
}

.mock-ui .m-side i { border-radius: 4px; background: #eef3f9; }
.mock-ui .m-side i:first-child { background: #d8e6fa; }

/* ---------- 8. 亮点三卡 ---------- */
.highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: -46px;
  position: relative;
  z-index: 5;
}

.hl-card {
  padding: 26px 26px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .22s ease, box-shadow .22s ease;
}

.hl-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.hl-icon {
  width: 46px;
  height: 46px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  background: var(--brand-soft);
  color: var(--brand);
}

.hl-icon svg { width: 23px; height: 23px; }

.hl-card h3 { font-size: 18px; margin-bottom: 8px; }

.hl-card p { font-size: 14.8px; color: var(--ink-3); }

/* ---------- 9. 工具矩阵 ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(178px, 1fr));
  gap: 14px;
}

.tool-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 15px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.tool-card:hover {
  transform: translateY(-3px);
  border-color: rgba(37, 99, 235, .45);
  box-shadow: var(--shadow);
}

.tool-ico {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, #eff4ff, #e6ecff);
  color: var(--brand);
}

.tool-ico svg { width: 20px; height: 20px; }

.tool-name { font-size: 15px; font-weight: 700; color: var(--ink); }

.tool-key {
  display: block;
  font-size: 11.5px;
  color: var(--ink-4);
  font-weight: 600;
  letter-spacing: .04em;
}

/* ---------- 10. 深度特性（图文交替） ---------- */
.feature-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 56px;
  align-items: center;
  padding: 64px 0;
  border-bottom: 1px dashed var(--line);
}

.feature-row:last-child { border-bottom: 0; }

.feature-row.is-reverse .feature-visual { order: 2; }

.feature-copy h3 {
  font-size: clamp(22px, 2.4vw, 29px);
  margin-bottom: 14px;
}

.feature-copy > p {
  font-size: 16px;
  color: var(--ink-3);
  margin-bottom: 20px;
}

.feature-points { display: grid; gap: 11px; }

.feature-points li {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  font-size: 15px;
  color: var(--ink-2);
}

.feature-points svg {
  flex-shrink: 0;
  width: 19px;
  height: 19px;
  margin-top: 4px;
  color: var(--brand);
}

.feature-points b { color: var(--ink); font-weight: 700; }

.feature-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.chip {
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-size: 12.5px;
  font-weight: 700;
}

.chip--pro {
  background: linear-gradient(135deg, #fff4e2, #ffe9c7);
  color: #b45309;
}

/* ---------- 11. 使用场景 ---------- */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(268px, 1fr));
  gap: 22px;
}

.scene-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  transition: transform .22s ease, box-shadow .22s ease;
}

.scene-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.scene-card .shot-frame { aspect-ratio: 4 / 3; border: 0; border-radius: 0; }
.scene-card .ph { border-radius: 0; }

.scene-body { padding: 20px 22px 24px; }

.scene-body h3 { font-size: 17.5px; margin-bottom: 8px; }

.scene-body p { font-size: 14.6px; color: var(--ink-3); }

/* ---------- 12. 快捷键表 ---------- */
.shortcut-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(288px, 1fr));
  gap: 22px;
}

.sc-panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.sc-panel h4 {
  padding: 15px 20px;
  font-size: 15px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--ink);
}

.sc-panel ul { padding: 8px 0; }

.sc-panel li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 20px;
  font-size: 14.6px;
}

.sc-panel li + li { border-top: 1px solid #f1f4f8; }

.sc-panel li span { color: var(--ink-2); }

kbd {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 6px;
  border: 1px solid #d5deea;
  border-bottom-width: 2px;
  background: #fff;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
  color: var(--ink);
  white-space: nowrap;
}

/* ---------- 13. 版本对比表 ---------- */
.pricing {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  align-items: start;
}

.plan {
  position: relative;
  padding: 30px 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease;
}

.plan:hover { transform: translateY(-4px); box-shadow: var(--shadow); }

.plan.is-featured {
  border-color: transparent;
  box-shadow: var(--shadow-lg);
  background: linear-gradient(#fff, #fff) padding-box,
    linear-gradient(135deg, var(--brand), var(--brand-deep)) border-box;
  border: 2px solid transparent;
}

.plan-flag {
  position: absolute;
  top: -13px;
  left: 26px;
  padding: 3px 13px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  box-shadow: var(--shadow-brand);
}

.plan h3 { font-size: 19px; }

.plan-price {
  margin: 6px 0 4px;
  font-size: 27px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -.02em;
}

.plan-price small {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-4);
}

.plan-note {
  font-size: 13.5px;
  color: var(--ink-3);
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--line);
  margin-bottom: 18px;
}

.plan ul { display: grid; gap: 11px; margin-bottom: 24px; }

.plan li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14.6px;
  color: var(--ink-2);
}

.plan li svg { width: 17px; height: 17px; margin-top: 4px; flex-shrink: 0; }

.plan li.off { color: var(--ink-4); }

.plan .btn { width: 100%; }

/* ---------- 14. FAQ ---------- */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  overflow: hidden;
  transition: border-color .2s ease, box-shadow .2s ease;
}

.faq-item.is-open {
  border-color: rgba(37, 99, 235, .4);
  box-shadow: var(--shadow-sm);
}

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 17px 20px;
  background: transparent;
  border: 0;
  text-align: left;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.faq-q svg {
  width: 18px;
  height: 18px;
  margin-left: auto;
  flex-shrink: 0;
  color: var(--brand);
  transition: transform .25s ease;
}

.faq-item.is-open .faq-q svg { transform: rotate(180deg); }

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}

.faq-a > div {
  padding: 0 20px 18px;
  font-size: 15px;
  color: var(--ink-3);
}

.faq-a a { font-weight: 600; }

/* ---------- 15. 下载区 ---------- */
.download {
  position: relative;
  padding: 92px 0;
  background: linear-gradient(180deg, #eaf1f9 0%, #f7fafc 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.dl-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: 52px;
  align-items: center;
}

.dl-inner h2 {
  font-size: clamp(28px, 3.6vw, 40px);
  color: var(--ink);
  margin-bottom: 18px;
}

.dl-inner > div > p {
  font-size: 17px;
  color: var(--ink-3);
  margin-bottom: 30px;
}

.dl-card {
  padding: 28px;
  border-radius: 18px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.dl-meta {
  display: grid;
  gap: 12px;
  margin-bottom: 22px;
}

.dl-meta-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  font-size: 14.5px;
  padding-bottom: 11px;
  border-bottom: 1px solid var(--line);
}

.dl-meta-row:last-child { border-bottom: 0; }
.dl-meta-row span { color: var(--ink-3); }
.dl-meta-row b { color: var(--ink); font-weight: 700; }

.dl-card .btn { width: 100%; }

.dl-sub {
  margin-top: 14px;
  text-align: center;
  font-size: 13px;
  color: var(--ink-4);
}

.dl-badges {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 26px;
}

.dl-badge {
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 13.5px;
  color: var(--ink-3);
}

/* ---------- 16. 页脚 ---------- */
.footer {
  padding: 54px 0 30px;
  background: #f7f9fc;
  color: var(--ink-3);
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
  gap: 36px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--line);
}

.footer .brand-text b { color: var(--ink); }

.footer-about {
  margin-top: 14px;
  max-width: 340px;
  line-height: 1.8;
}

.footer h5 {
  margin: 0 0 14px;
  font-size: 14.5px;
  color: var(--ink);
  font-weight: 700;
}

.footer li { margin-bottom: 9px; }

.footer a { color: var(--ink-3); }

.footer a:hover { color: var(--brand); }

.footer-bottom {
  padding-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  font-size: 13px;
}

.footer-bottom span { color: var(--ink-4); }

/* ---------- 16.5 反馈表单 ---------- */
.feedback {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
  gap: 46px;
  align-items: start;
}

.fb-copy h3 {
  font-size: clamp(22px, 2.6vw, 30px);
  margin-bottom: 14px;
}

.fb-copy > p {
  font-size: 16px;
  color: var(--ink-3);
  margin-bottom: 22px;
}

.fb-steps { display: grid; gap: 16px; }

.fb-step {
  display: flex;
  gap: 13px;
  align-items: flex-start;
}

.fb-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-size: 14px;
  font-weight: 800;
}

.fb-step b {
  display: block;
  font-size: 15.5px;
  color: var(--ink);
}

.fb-step span { font-size: 14.4px; color: var(--ink-3); }

.fb-form {
  padding: 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.fb-field { margin-bottom: 16px; position: relative; }

.fb-field label {
  display: block;
  margin-bottom: 7px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.fb-field label em { font-style: normal; color: #d13b3b; }

.fb-field input,
.fb-field textarea {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid #d7dee9;
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 15px;
  color: var(--ink);
  background: #fcfdfe;
  transition: border-color .18s ease, box-shadow .18s ease;
}

.fb-field textarea {
  min-height: 130px;
  resize: vertical;
  line-height: 1.7;
}

.fb-field input:focus,
.fb-field textarea:focus {
  outline: none;
  border-color: var(--brand);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, .14);
}

.fb-hint {
  margin-top: 6px;
  font-size: 12.5px;
  color: var(--ink-4);
}

.fb-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.fb-actions .btn { min-width: 150px; }

.fb-status {
  margin-top: 14px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-size: 14.5px;
  display: none;
}

.fb-status.is-show { display: block; }
.fb-status.is-ok { background: #e8f6ee; border: 1px solid #b6e2c6; color: #1c7a44; }
.fb-status.is-err { background: #fdeceb; border: 1px solid #f5c2bd; color: #a8322a; }

.fb-mailto { font-size: 13.5px; color: var(--ink-4); }

.dl-sub b { color: var(--ink); font-weight: 700; }

/* 蜜罐字段：机器人会填，人看不到 */
.fb-hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* ---------- 17. 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .7s cubic-bezier(.22, .61, .36, 1), transform .7s cubic-bezier(.22, .61, .36, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* 回到顶部 */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  color: #fff;
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: var(--shadow-brand);
  opacity: 0;
  transform: translateY(14px);
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
}

.to-top svg { width: 20px; height: 20px; }

.to-top.is-show {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1080px) {
  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .hero-copy { max-width: none; }
  .dl-inner { grid-template-columns: 1fr; }
  .highlights { grid-template-columns: 1fr; }
  .feedback { grid-template-columns: 1fr; gap: 30px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .nav-links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 14px 22px 22px;
    background: rgba(255, 255, 255, .97);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .22s ease, transform .22s ease;
  }

  .nav-links.is-open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .nav-links a,
  .nav.is-solid .nav-links a {
    color: var(--ink);
    padding: 12px 10px;
    font-size: 16px;
  }

  .nav-links a.is-active,
  .nav.is-solid .nav-links a.is-active { background: var(--brand-soft); color: var(--brand); }

  .burger { display: grid; margin-left: auto; }

  .nav-cta { order: 3; }
  .nav-ver { display: none; }

  .feature-row,
  .feature-row.is-reverse .feature-visual {
    grid-template-columns: 1fr;
    order: 0;
    gap: 32px;
    padding: 48px 0;
  }

  .pricing { grid-template-columns: 1fr; }
  .hero-stats { gap: 26px; flex-wrap: wrap; }
}

@media (max-width: 640px) {
  .section { padding: 68px 0; }
  .wrap { padding: 0 18px; }
  .hero { padding-top: calc(var(--nav-h) + 52px); }
  .hero-stats { gap: 20px; }
  .hero-stat b { font-size: 22px; }
  .tool-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .footer-grid { grid-template-columns: 1fr; }
  .btn-lg { padding: 14px 26px; font-size: 15.5px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}