/* ============================================================
   背单词花园 · 官网主样式
   风格关键词：清晰（层级明确、留白充足）+ 活泼（圆角、花果点缀、明快配色）
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 主色：花园绿 */
  --green-50:  #F1FBF4;
  --green-100: #DCF5E4;
  --green-200: #B6E9C8;
  --green-400: #4CC47F;
  --green-500: #2FB26A;
  --green-600: #219455;
  --green-700: #17743F;

  /* 辅助色 */
  --sun:      #FFC53D;
  --sun-dark: #E9A800;
  --sky:      #4CB8F0;
  --sky-dark: #2A93CC;
  --coral:    #FF7A8A;
  --grape:    #9B7BF0;
  --leaf:     #7ED957;

  /* 中性色 */
  --ink:      #16261D;
  --ink-2:    #33473C;
  --body:     #4E6357;
  --muted:    #86988C;
  --line:     #E3EFE7;
  --line-2:   #D2E5D9;
  --bg:       #FFFFFF;
  --bg-soft:  #F7FCF9;
  --bg-cream: #FFFBF2;

  /* 圆角 */
  --r-sm: 12px;
  --r:    18px;
  --r-lg: 26px;
  --r-xl: 36px;
  --pill: 999px;

  /* 阴影 */
  --sh-sm: 0 2px 8px rgba(23, 116, 63, .06);
  --sh:    0 8px 26px rgba(23, 116, 63, .09);
  --sh-lg: 0 18px 46px rgba(23, 116, 63, .13);
  --sh-ink: 0 10px 30px rgba(22, 38, 29, .18);

  /* 字体 */
  --font: "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Source Han Sans SC",
          "Noto Sans SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont,
          "Segoe UI", Roboto, system-ui, sans-serif;

  /* 布局 */
  --wrap: 1180px;
  --nav-h: 72px;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--body);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
  margin: 0 0 .5em;
  color: var(--ink);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.01em;
}
h1 { font-size: clamp(30px, 4.4vw, 50px); }
h2 { font-size: clamp(25px, 3vw, 36px); }
h3 { font-size: clamp(18px, 1.6vw, 22px); }
h4 { font-size: 17px; }

p { margin: 0 0 1em; }
a { color: var(--green-600); text-decoration: none; transition: color .18s; }
a:hover { color: var(--green-700); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { margin: 0 0 1em; padding-left: 1.35em; }
li { margin-bottom: .4em; }
strong, b { color: var(--ink-2); font-weight: 700; }
button { font-family: inherit; }

::selection { background: var(--green-200); color: var(--ink); }

:focus-visible {
  outline: 3px solid var(--green-400);
  outline-offset: 2px;
  border-radius: 6px;
}

/* 跳转到主内容（无障碍） */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--green-600); color: #fff; padding: 10px 18px;
  border-radius: 0 0 var(--r-sm) 0; font-weight: 700;
}
.skip-link:focus { left: 0; color: #fff; }

/* ---------- 3. 布局工具 ---------- */
.container { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 22px; }
.container-narrow { max-width: 860px; }
.sec { padding: 86px 0; position: relative; }
.sec-sm { padding: 58px 0; }
.sec-soft { background: var(--bg-soft); }
.sec-cream { background: var(--bg-cream); }
.sec-green {
  background: linear-gradient(160deg, #EAF9EF 0%, #F7FDF9 60%, #FFFFFF 100%);
}
.sec-ink {
  background: linear-gradient(150deg, #123326 0%, #1B4A34 55%, #14603C 100%);
  color: #CFE9DA;
}
.sec-ink h2, .sec-ink h3, .sec-ink h4 { color: #fff; }
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

.grid { display: grid; gap: 22px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 4. 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  height: 100%; display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand img { width: 40px; height: 40px; border-radius: 12px; box-shadow: var(--sh-sm); }
.brand b {
  font-size: 20px; color: var(--ink); font-weight: 800; letter-spacing: -.02em;
}
.brand span { font-size: 11px; color: var(--muted); display: block; line-height: 1; margin-top: 3px; }

.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav a {
  color: var(--ink-2); font-size: 15.5px; font-weight: 600;
  padding: 9px 15px; border-radius: var(--pill); transition: .18s;
}
.nav a:hover, .nav a[aria-current="page"] { background: var(--green-50); color: var(--green-700); }

.header-cta { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.nav-toggle {
  display: none; margin-left: auto; width: 44px; height: 44px;
  border: 1px solid var(--line-2); background: #fff; border-radius: 13px;
  cursor: pointer; padding: 0; align-items: center; justify-content: center;
}
.nav-toggle span {
  display: block; width: 19px; height: 2px; background: var(--ink-2);
  border-radius: 2px; position: relative;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 19px; height: 2px;
  background: var(--ink-2); border-radius: 2px; transition: .22s;
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: var(--pill); border: 0;
  font-size: 16px; font-weight: 700; line-height: 1.2;
  cursor: pointer; transition: transform .18s, box-shadow .18s, background .18s;
  white-space: nowrap;
}
.btn svg { flex-shrink: 0; }
.btn-primary {
  background: linear-gradient(135deg, var(--green-400), var(--green-600));
  color: #fff; box-shadow: 0 8px 20px rgba(33, 148, 85, .3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(33, 148, 85, .38); color: #fff; }
.btn-sun {
  background: linear-gradient(135deg, #FFD86A, var(--sun-dark));
  color: #5A3E00; box-shadow: 0 8px 20px rgba(233, 168, 0, .28);
}
.btn-sun:hover { transform: translateY(-2px); color: #5A3E00; }
.btn-ghost {
  background: #fff; color: var(--green-700);
  border: 2px solid var(--green-200); box-shadow: var(--sh-sm);
}
.btn-ghost:hover { border-color: var(--green-400); background: var(--green-50); transform: translateY(-2px); }
.btn-sm { padding: 9px 18px; font-size: 14.5px; }
.btn-lg { padding: 16px 34px; font-size: 17.5px; }
.btn-block { width: 100%; }

/* ---------- 6. 通用区块标题 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 15px; border-radius: var(--pill);
  background: var(--green-100); color: var(--green-700);
  font-size: 13.5px; font-weight: 800; letter-spacing: .04em;
  margin-bottom: 16px;
}
.eyebrow.sun   { background: #FFF3D4; color: #9A6B00; }
.eyebrow.sky   { background: #E2F3FE; color: #1A6E9C; }
.eyebrow.coral { background: #FFECEF; color: #C13A4D; }
.sec-ink .eyebrow { background: rgba(255,255,255,.14); color: #B9EFCF; }

.sec-head { max-width: 730px; margin: 0 auto 48px; text-align: center; }
.sec-head p { font-size: 17px; color: var(--body); margin: 0; }
.sec-head.left { margin-left: 0; text-align: left; }
.sec-ink .sec-head p { color: #B4D8C6; }

/* 标题下的手绘下划线 */
.uline { position: relative; display: inline-block; }
.uline::after {
  content: ""; position: absolute; left: -2%; right: -2%; bottom: .04em;
  height: .42em; background: var(--sun); opacity: .38;
  border-radius: 6px; z-index: -1;
  transform: rotate(-.6deg);
}

/* ---------- 7. 卡片 ---------- */
.card {
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 28px;
  box-shadow: var(--sh-sm); transition: transform .22s, box-shadow .22s, border-color .22s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--sh); border-color: var(--green-200); }
.card h3 { margin-bottom: .35em; }
.card p:last-child { margin-bottom: 0; }

.icon-badge {
  width: 52px; height: 52px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px; flex-shrink: 0;
}
.ib-green { background: var(--green-100); color: var(--green-600); }
.ib-sun   { background: #FFF3D4; color: var(--sun-dark); }
.ib-sky   { background: #E2F3FE; color: var(--sky-dark); }
.ib-coral { background: #FFECEF; color: var(--coral); }
.ib-grape { background: #F0EBFE; color: var(--grape); }

.tag {
  display: inline-block; padding: 4px 12px; border-radius: var(--pill);
  background: var(--green-50); color: var(--green-700);
  font-size: 13px; font-weight: 700; border: 1px solid var(--green-100);
}

/* ---------- 8. 首屏 Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: 74px 0 90px;
  background:
    radial-gradient(900px 520px at 88% -8%, #DFF6E7 0%, rgba(223,246,231,0) 62%),
    radial-gradient(700px 460px at -6% 12%, #FFF4D8 0%, rgba(255,244,216,0) 60%),
    linear-gradient(180deg, #FBFFFC 0%, #FFFFFF 78%);
}
.hero-deco { position: absolute; inset: 0; pointer-events: none; z-index: 0; }
.hero-deco svg { position: absolute; }

.hero .container { position: relative; z-index: 1; }
.hero-grid {
  display: grid; grid-template-columns: 1.06fr .94fr;
  gap: 56px; align-items: center;
}
.hero h1 { margin-bottom: 20px; }
.hero h1 em {
  font-style: normal; color: var(--green-600);
  background: linear-gradient(180deg, transparent 62%, var(--green-100) 62%);
}
.hero-lead {
  font-size: 18px; color: var(--body); margin-bottom: 26px; max-width: 540px;
}
.hero-btns { display: flex; flex-wrap: wrap; gap: 13px; margin-bottom: 22px; }
.hero-note {
  display: flex; flex-wrap: wrap; gap: 8px 18px;
  font-size: 14px; color: var(--muted);
}
.hero-note span { display: inline-flex; align-items: center; gap: 6px; }
.hero-note svg { color: var(--green-500); flex-shrink: 0; }

/* 手机截图组 */
.phones {
  position: relative; display: flex; justify-content: center;
  align-items: flex-end; min-height: 480px;
}
.phone {
  border-radius: 30px; overflow: hidden; background: #fff;
  border: 6px solid #fff;
  box-shadow: 0 24px 54px rgba(23, 116, 63, .2);
}
.phone img { width: 100%; height: auto; }
.phone-main { width: 264px; position: relative; z-index: 2; }
.phone-sub {
  width: 208px; position: absolute; z-index: 1; opacity: .98;
}
.phone-sub.left  { left: 0;  bottom: 6px; transform: rotate(-7deg) translateY(14px); }
.phone-sub.right { right: 0; bottom: 40px; transform: rotate(6deg); }

.float-card {
  position: absolute; z-index: 3;
  background: #fff; border-radius: var(--r);
  padding: 12px 16px; box-shadow: var(--sh-lg);
  display: flex; align-items: center; gap: 11px;
  font-size: 13.5px; font-weight: 700; color: var(--ink);
  animation: floaty 4.4s ease-in-out infinite;
}
.float-card small { display: block; font-size: 11.5px; color: var(--muted); font-weight: 600; }
.float-card .fc-ico {
  width: 34px; height: 34px; border-radius: 11px;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.fc-a { top: 44px; left: -6px; animation-delay: .3s; }
.fc-b { bottom: 96px; right: -10px; animation-delay: 1.4s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-9px); }
}
@media (prefers-reduced-motion: reduce) {
  .float-card { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 9. 信任条 ---------- */
.trust {
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  background: var(--bg-soft); padding: 22px 0;
}
.trust-inner {
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: center; gap: 14px 40px;
}
.trust-item {
  display: flex; align-items: center; gap: 9px;
  font-size: 15px; font-weight: 700; color: var(--ink-2);
}
.trust-item svg { color: var(--green-500); }
.trust-item em {
  font-style: normal; color: var(--muted); font-weight: 600; font-size: 13.5px;
}

/* ---------- 10. 步骤流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; position: relative; }
.step {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 30px 26px 26px; position: relative; box-shadow: var(--sh-sm);
}
.step-num {
  position: absolute; top: -18px; left: 26px;
  width: 44px; height: 44px; border-radius: 14px;
  background: linear-gradient(135deg, var(--green-400), var(--green-600));
  color: #fff; font-weight: 800; font-size: 19px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 18px rgba(33, 148, 85, .3);
}
.step:nth-child(2) .step-num { background: linear-gradient(135deg, #FFD86A, var(--sun-dark)); }
.step:nth-child(3) .step-num { background: linear-gradient(135deg, #7FD3F7, var(--sky-dark)); }
.step h3 { margin-top: 14px; }
.step .step-shot {
  margin-top: 16px; border-radius: var(--r); overflow: hidden;
  border: 1px solid var(--line); background: var(--bg-soft);
}
.step .step-shot img { width: 100%; }

/* ---------- 11. 四步闭环 ---------- */
.loop { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.loop-item {
  border-radius: var(--r-lg); padding: 26px 24px; color: #fff;
  position: relative; overflow: hidden; box-shadow: var(--sh);
}
.loop-item h3 { color: #fff; margin-bottom: .3em; }
.loop-item p { margin: 0; font-size: 14.5px; line-height: 1.7; }
.loop-item .loop-k {
  font-size: 12px; font-weight: 800; letter-spacing: .16em;
  text-transform: uppercase; opacity: .85; margin-bottom: 10px; display: block;
}
.loop-1 { background: linear-gradient(145deg, #4CC47F, #219455); }
.loop-2 { background: linear-gradient(145deg, #58C2F5, #2A93CC); }
.loop-3 { background: linear-gradient(145deg, #FFC85C, #E09B00); }
.loop-4 { background: linear-gradient(145deg, #A98BF7, #7B5BE0); }
.loop-item::after {
  content: ""; position: absolute; right: -28px; bottom: -34px;
  width: 118px; height: 118px; border-radius: 50%;
  background: rgba(255,255,255,.13);
}

/* ---------- 12. 功能矩阵 ---------- */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feat {
  display: flex; gap: 15px; padding: 22px; border-radius: var(--r-lg);
  background: #fff; border: 1px solid var(--line); box-shadow: var(--sh-sm);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.feat:hover { transform: translateY(-3px); box-shadow: var(--sh); border-color: var(--green-200); }
.feat .icon-badge { margin-bottom: 0; width: 46px; height: 46px; border-radius: 14px; }
.feat h3 { font-size: 16.5px; margin-bottom: .25em; }
.feat p { margin: 0; font-size: 14.5px; line-height: 1.68; }

/* ---------- 13. 词库覆盖 ---------- */
.vocab-wrap { display: grid; grid-template-columns: .92fr 1.08fr; gap: 48px; align-items: center; }
.vocab-list { display: grid; gap: 14px; }
.vocab-item {
  display: flex; gap: 14px; align-items: flex-start;
  background: #fff; border: 1px solid var(--line); border-radius: var(--r);
  padding: 17px 20px; box-shadow: var(--sh-sm);
}
.vocab-item .vt {
  width: 34px; height: 34px; border-radius: 11px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--green-100); color: var(--green-700); font-weight: 800; font-size: 13px;
}
.vocab-item b { display: block; color: var(--ink); font-size: 15.5px; }
.vocab-item p { margin: 2px 0 0; font-size: 14px; color: var(--body); }

/* ---------- 14. 会员 / 双娃 ---------- */
.dual { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.dual-card {
  border-radius: var(--r-xl); padding: 34px; position: relative; overflow: hidden;
  border: 1px solid var(--line);
}
.dual-a { background: linear-gradient(160deg, #F0FBF4, #FFFFFF); }
.dual-b { background: linear-gradient(160deg, #FFF9EA, #FFFFFF); }
.acct-row { display: grid; grid-template-columns: 1fr auto 1fr; gap: 12px; align-items: center; margin-top: 20px; }
.acct {
  background: #fff; border: 2px dashed var(--green-200); border-radius: var(--r);
  padding: 16px; text-align: center; box-shadow: var(--sh-sm);
}
.acct b { display: block; color: var(--ink); font-size: 15px; }
.acct small { color: var(--muted); font-size: 12.5px; }
.acct-plus { color: var(--green-500); font-weight: 800; font-size: 22px; }

/* ---------- 15. 用户评价 ---------- */
.quotes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.quote {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 26px; box-shadow: var(--sh-sm); position: relative;
}
.quote::before {
  content: "\201C"; position: absolute; top: 8px; right: 22px;
  font-size: 62px; line-height: 1; color: var(--green-100);
  font-family: Georgia, serif;
}
.quote p { font-size: 15px; color: var(--ink-2); margin-bottom: 16px; position: relative; }
.quote-foot { display: flex; align-items: center; gap: 11px; }
.avatar {
  width: 40px; height: 40px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; color: #fff; font-size: 15px;
}
.quote-foot b { display: block; font-size: 14.5px; color: var(--ink); }
.quote-foot small { color: var(--muted); font-size: 12.5px; }
.stars { color: var(--sun); letter-spacing: 1px; font-size: 14px; margin-bottom: 10px; display: block; }

/* ---------- 16. 文章推荐条 ---------- */
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.post {
  display: flex; flex-direction: column;
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 24px; box-shadow: var(--sh-sm);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.post:hover { transform: translateY(-4px); box-shadow: var(--sh); border-color: var(--green-200); }
.post h3 { font-size: 17px; margin-bottom: .4em; }
.post h3 a { color: var(--ink); }
.post h3 a:hover { color: var(--green-600); }
.post p { font-size: 14.5px; color: var(--body); margin-bottom: 14px; flex: 1; }
.post-meta {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; color: var(--muted); border-top: 1px dashed var(--line-2);
  padding-top: 13px;
}

/* ---------- 17. FAQ ---------- */
.faq-list { max-width: 860px; margin: 0 auto; display: grid; gap: 12px; }
.faq-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r);
  box-shadow: var(--sh-sm); overflow: hidden;
}
.faq-item summary {
  cursor: pointer; list-style: none; padding: 19px 54px 19px 22px;
  font-weight: 700; color: var(--ink); font-size: 16.5px; position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: ""; position: absolute; right: 24px; top: 50%;
  width: 10px; height: 10px; border-right: 2.5px solid var(--green-500);
  border-bottom: 2.5px solid var(--green-500);
  transform: translateY(-70%) rotate(45deg); transition: transform .22s;
}
.faq-item[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq-item[open] summary { color: var(--green-700); }
.faq-body { padding: 0 22px 20px; color: var(--body); font-size: 15.5px; }
.faq-body p:last-child { margin-bottom: 0; }

/* ---------- 18. 底部 CTA ---------- */
.cta-band {
  border-radius: var(--r-xl); padding: 52px 44px; text-align: center;
  background:
    radial-gradient(600px 300px at 20% 0%, rgba(255,255,255,.16), transparent 70%),
    linear-gradient(140deg, #2FB26A 0%, #17743F 100%);
  color: #fff; box-shadow: var(--sh-lg); position: relative; overflow: hidden;
}
.cta-band h2 { color: #fff; margin-bottom: 14px; }
.cta-band p { color: #D3F0DF; font-size: 17px; max-width: 620px; margin: 0 auto 28px; }
.cta-band .btn-ghost { background: #fff; border-color: #fff; color: var(--green-700); }
.cta-band .btn-sun { box-shadow: none; }
.cta-btns { display: flex; flex-wrap: wrap; gap: 13px; justify-content: center; }
.cta-band .cta-mini {
  margin-top: 22px; font-size: 13.5px; color: #A9DCC0;
}

/* ---------- 19. 页脚 ---------- */
.site-footer {
  background: #0F2A1E; color: #9FBFAD;
  padding: 60px 0 28px; font-size: 14.5px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.1);
}
.site-footer h4 { color: #fff; font-size: 15.5px; margin-bottom: 15px; }
.site-footer a { color: #9FBFAD; }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 9px; }
.footer-brand { display: flex; align-items: center; gap: 11px; margin-bottom: 14px; }
.footer-brand img { width: 38px; height: 38px; border-radius: 11px; }
.footer-brand b { color: #fff; font-size: 18px; }
.footer-about { max-width: 300px; line-height: 1.7; }
.footer-qr {
  display: flex; gap: 14px; margin-top: 16px;
}
.footer-qr figure { margin: 0; text-align: center; }
.footer-qr img {
  width: 92px; height: 92px; border-radius: 12px; background: #fff; padding: 4px;
}
.footer-qr figcaption { font-size: 12px; margin-top: 6px; color: #7FA791; }
.footer-bottom {
  padding-top: 24px; display: flex; flex-wrap: wrap; gap: 10px 24px;
  justify-content: space-between; font-size: 13px; color: #7FA791;
}
.footer-bottom .links { display: flex; flex-wrap: wrap; gap: 8px 18px; }

/* ---------- 20. 面包屑 ---------- */
.crumb {
  font-size: 14px; color: var(--muted); padding: 18px 0 0;
}
.crumb ol {
  list-style: none; display: flex; flex-wrap: wrap; gap: 8px;
  padding: 0; margin: 0; align-items: center;
}
.crumb li { margin: 0; }
.crumb li + li::before { content: "/"; margin-right: 8px; color: var(--line-2); }
.crumb a { color: var(--muted); font-weight: 600; }
.crumb a:hover { color: var(--green-600); }
.crumb [aria-current] { color: var(--ink-2); font-weight: 700; }

/* ---------- 21. 下载页专用 ---------- */
.dl-hero {
  padding: 56px 0 46px; text-align: center;
  background:
    radial-gradient(800px 380px at 50% -30%, #DFF6E7, transparent 70%),
    linear-gradient(180deg, #FBFFFC, #fff);
}
.dl-hero h1 { font-size: clamp(28px, 3.6vw, 42px); }
.dl-hero .dl-sub {
  font-size: 17.5px; color: var(--body); max-width: 700px; margin: 0 auto 26px;
}
.dl-quick {
  display: flex; flex-wrap: wrap; gap: 9px 20px; justify-content: center;
  font-size: 14.5px; color: var(--muted); margin-bottom: 30px;
}
.dl-quick span { display: inline-flex; align-items: center; gap: 6px; }
.dl-quick svg { color: var(--green-500); }

.dl-primary {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 30px;
  background: linear-gradient(150deg, #F1FBF4, #FFF);
  border: 1px solid var(--green-200); border-radius: var(--r-xl);
  padding: 34px; align-items: center; box-shadow: var(--sh);
}
.dl-primary h2 { font-size: 24px; margin-bottom: 10px; }
.dl-primary .dl-ver {
  display: inline-block; background: var(--green-600); color: #fff;
  font-size: 12.5px; font-weight: 800; padding: 3px 11px;
  border-radius: var(--pill); margin-left: 8px; vertical-align: 3px;
}
.dl-primary .dl-btns { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.dl-primary .dl-fine { font-size: 13px; color: var(--muted); margin: 14px 0 0; }
.dl-qr-big { text-align: center; }
.dl-qr-big img {
  width: 168px; height: 168px; margin: 0 auto 12px;
  border-radius: var(--r); background: #fff; padding: 8px;
  border: 1px solid var(--line); box-shadow: var(--sh-sm);
}
.dl-qr-big b { display: block; color: var(--ink); }
.dl-qr-big small { color: var(--muted); }

.dl-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.dl-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 24px 20px; text-align: center; box-shadow: var(--sh-sm);
  display: flex; flex-direction: column; align-items: center;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.dl-card:hover { transform: translateY(-4px); box-shadow: var(--sh); border-color: var(--green-200); }
.dl-card img.qr {
  width: 108px; height: 108px; border-radius: 14px;
  border: 1px solid var(--line); padding: 6px; background: #fff;
  margin-bottom: 14px; object-fit: contain;
}
.dl-card h3 { font-size: 16.5px; margin-bottom: .2em; }
.dl-card .dl-desc { font-size: 13.5px; color: var(--muted); margin-bottom: 14px; flex: 1; }
.dl-card .btn { width: 100%; }

.machine-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.machine {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r);
  padding: 20px 14px; text-align: center; box-shadow: var(--sh-sm);
}
.machine b { display: block; color: var(--ink); font-size: 15px; margin-bottom: 4px; }
.machine small { color: var(--muted); font-size: 12.5px; }
.machine .m-ico {
  width: 40px; height: 40px; border-radius: 13px; margin: 0 auto 11px;
  background: var(--green-100); color: var(--green-700);
  display: flex; align-items: center; justify-content: center; font-weight: 800;
}

.tips-box {
  background: #FFFBF0; border: 1px solid #FFE7AE; border-radius: var(--r-lg);
  padding: 30px 32px;
}
.tips-box h3 { color: #8A5E00; }
.tips-box ol { counter-reset: t; list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.tips-box li {
  counter-increment: t; position: relative; padding-left: 40px;
  margin: 0; font-size: 15px; color: #6B5220;
}
.tips-box li::before {
  content: counter(t); position: absolute; left: 0; top: 2px;
  width: 26px; height: 26px; border-radius: 9px;
  background: var(--sun); color: #5A3E00;
  font-weight: 800; font-size: 13px;
  display: flex; align-items: center; justify-content: center;
}
.tips-box a { color: #A5760A; text-decoration: underline; }

.warn-strip {
  display: flex; gap: 14px; align-items: flex-start;
  background: #FFF2F4; border: 1px solid #FFD3DA; border-radius: var(--r-lg);
  padding: 22px 24px; color: #8C2F41;
}
.warn-strip svg { flex-shrink: 0; margin-top: 2px; color: var(--coral); }
.warn-strip b { color: #8C2F41; }
.warn-strip p { margin: 0; font-size: 14.5px; }

/* ---------- 22. 通用工具类 ---------- */
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }
.mt-56 { margin-top: 56px; }
.hide { display: none !important; }

/* 滚动入场动画 */
.reveal { opacity: 0; transform: translateY(22px); }
.reveal.in { opacity: 1; transform: none; transition: opacity .6s ease, transform .6s cubic-bezier(.22,.8,.3,1); }
@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal.in { opacity: 1; transform: none; transition: none; }
}

/* ---------- 23. 响应式 ---------- */
@media (max-width: 1040px) {
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .loop { grid-template-columns: repeat(2, 1fr); }
  .quotes { grid-template-columns: 1fr; }
  .post-grid { grid-template-columns: repeat(2, 1fr); }
  .dl-grid { grid-template-columns: repeat(3, 1fr); }
  .machine-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 900px) {
  .nav {
    position: fixed; inset: var(--nav-h) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #fff; padding: 16px 22px 22px;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--sh-lg);
    transform: translateY(-130%); transition: transform .28s ease;
    max-height: calc(100vh - var(--nav-h)); overflow-y: auto;
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 13px 14px; font-size: 16px; }
  .header-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav-toggle.open span { background: transparent; }
  .nav-toggle.open span::before { top: 0; transform: rotate(45deg); }
  .nav-toggle.open span::after  { top: 0; transform: rotate(-45deg); }

  .hero { padding: 46px 0 62px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-lead { font-size: 16.5px; }
  .vocab-wrap { grid-template-columns: 1fr; gap: 32px; }
  .dual { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 30px; }
  .dl-primary { grid-template-columns: 1fr; padding: 26px; }
  .sec { padding: 62px 0; }
  .sec-head { margin-bottom: 34px; }
  .sec-head p { font-size: 16px; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .g2, .g3, .g4, .feat-grid, .loop, .post-grid { grid-template-columns: 1fr; }
  .dl-grid { grid-template-columns: repeat(2, 1fr); }
  .machine-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
  .phones { min-height: auto; }
  .phone-main { width: 216px; }
  .phone-sub { display: none; }
  .float-card { font-size: 12.5px; padding: 10px 13px; }
  .fc-a { left: -4px; top: 12px; }
  .fc-b { right: -4px; bottom: 20px; }
  .cta-band { padding: 36px 22px; }
  .cta-band p { font-size: 15.5px; }
  .tips-box { padding: 22px; }
  .hero-btns .btn, .cta-btns .btn { flex: 1 1 100%; }
}

@media (max-width: 420px) {
  .dl-grid, .machine-grid { grid-template-columns: 1fr; }
}

/* 打印 */
@media print {
  .site-header, .site-footer, .cta-band, .nav-toggle, .float-card { display: none; }
  body { color: #000; }
}