/* =========================================================
   LedgerVault · 记账库 官网样式
   设计：米白底 #FBFBF7 + 深藏青 #1B2A4A 为主，薄荷绿 #2BA79E 点缀
   中英双语通过 <html class="lang-zh|lang-en"> 切换
   ========================================================= */

:root {
  --bg: #FBFBF7;          /* 米白 */
  --bg-alt: #F4F3EC;      /* 略深的米色，用于分区 */
  --ink: #1B2A4A;         /* 深藏青 */
  --ink-2: #3C4A66;       /* 次级深藏青 */
  --muted: #6B7790;       /* 弱化文字 */
  --accent: #2BA79E;      /* 薄荷绿点缀 */
  --accent-deep: #1E8C84;
  --accent-soft: #E4F3F0;
  --expense: #E5604D;     /* 支出红（取自 App 规范） */
  --income: #2BA79E;      /* 收入绿 */
  --card: #FFFFFF;
  --line: #E7E5DC;        /* 发丝线 */
  --line-soft: #EFEEE6;
  --shadow-sm: 0 1px 2px rgba(27,42,74,.05), 0 4px 14px rgba(27,42,74,.06);
  --shadow-md: 0 10px 40px rgba(27,42,74,.10);
  --shadow-lg: 0 24px 70px rgba(27,42,74,.16);
  --radius: 18px;
  --radius-lg: 26px;
  --maxw: 1160px;
  --font-display: "Fraunces", "Noto Serif SC", Georgia, "Songti SC", serif;
  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(.22,.61,.36,1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 17px;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1,h2,h3,h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.18; letter-spacing: -.01em; color: var(--ink); margin: 0; }

/* ---------- 双语切换 ---------- */
html.lang-zh .en { display: none !important; }
html.lang-en .zh { display: none !important; }

/* ---------- 容器 ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
section { padding: 96px 0; position: relative; }
.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.eyebrow {
  display: inline-block; font-size: 13px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--accent-deep); font-weight: 600; margin-bottom: 16px;
}
.section-head h2 { font-size: clamp(28px, 4vw, 44px); }
.section-head p { color: var(--muted); margin: 18px 0 0; font-size: 18px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 14px 26px; border-radius: 999px; font-weight: 600; font-size: 16px;
  border: 1px solid transparent; cursor: pointer; transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .2s;
  font-family: var(--font-sans);
}
.btn-primary { background: var(--ink); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); transform: translateY(-2px); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-deep); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn svg { width: 18px; height: 18px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251,251,247,.82); backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent; transition: border-color .3s, box-shadow .3s;
}
.nav.scrolled { border-color: var(--line); box-shadow: 0 6px 24px rgba(27,42,74,.05); }
.nav-inner { display: flex; align-items: center; gap: 22px; height: 74px; }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--font-display); font-weight: 600; font-size: 21px; color: var(--ink); }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.brand small { font-family: var(--font-sans); font-size: 11px; color: var(--muted); letter-spacing: .12em; display: block; line-height: 1; margin-top: 2px; }
.nav-links { display: flex; gap: 30px; margin-left: auto; align-items: center; }
.nav-links a { font-size: 15px; color: var(--ink-2); font-weight: 500; transition: color .2s; }
.nav-links a:hover { color: var(--ink); }
.nav-actions { display: flex; align-items: center; gap: 14px; }

/* 语言切换 */
.lang-toggle { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; background: #fff; }
.lang-toggle button {
  border: 0; background: transparent; padding: 7px 14px; font-size: 13px; font-weight: 600;
  color: var(--muted); cursor: pointer; font-family: var(--font-sans); transition: all .2s;
}
.lang-toggle button.active { background: var(--ink); color: #fff; }

/* 汉堡 */
.hamburger { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 11px; background: #fff; cursor: pointer; align-items: center; justify-content: center; }
.hamburger span { display: block; width: 18px; height: 2px; background: var(--ink); position: relative; }
.hamburger span::before, .hamburger span::after { content: ""; position: absolute; left: 0; width: 18px; height: 2px; background: var(--ink); }
.hamburger span::before { top: -6px; } .hamburger span::after { top: 6px; }

/* ---------- Hero ---------- */
.hero { padding: 84px 0 96px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero h1 { font-size: clamp(34px, 5.2vw, 60px); line-height: 1.08; }
.hero h1 .accent { color: var(--accent-deep); }
.hero .lede { font-size: 20px; color: var(--ink-2); margin: 24px 0 14px; max-width: 540px; }
.hero .slogan { font-family: var(--font-display); font-style: italic; font-size: 19px; color: var(--accent-deep); margin: 0 0 34px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-trust { margin-top: 38px; display: flex; gap: 26px; flex-wrap: wrap; }
.hero-trust div { font-size: 14px; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.hero-trust b { color: var(--ink); font-weight: 600; }
.hero-trust svg { width: 17px; height: 17px; color: var(--accent-deep); }

/* Hero 背景装饰 */
.hero::before {
  content: ""; position: absolute; right: -160px; top: -120px; width: 520px; height: 520px;
  background: radial-gradient(circle at 30% 30%, rgba(43,167,158,.16), transparent 62%);
  z-index: -1; border-radius: 50%;
}
.hero::after {
  content: ""; position: absolute; left: -180px; bottom: -160px; width: 420px; height: 420px;
  background: radial-gradient(circle at 50% 50%, rgba(27,42,74,.07), transparent 60%);
  z-index: -1; border-radius: 50%;
}

/* ---------- CSS 手机样机 ---------- */
.phone {
  width: 300px; margin: 0 auto; background: #0E1626; border-radius: 42px; padding: 12px;
  box-shadow: var(--shadow-lg); position: relative;
}
.phone::after { content:""; position:absolute; top:22px; left:50%; transform:translateX(-50%); width:96px; height:7px; background:#2a3650; border-radius:99px; }
.phone-screen {
  background: linear-gradient(180deg,#F7FBFA,#EFF4F2); border-radius: 32px; overflow: hidden;
  height: 620px; display: flex; flex-direction: column; font-size: 13px; color: #1F2D2B;
}
.ps-status { display: flex; justify-content: space-between; padding: 14px 20px 6px; font-size: 11px; font-weight: 600; color: #2a3b39; }
.ps-head { padding: 6px 18px 12px; display:flex; align-items:center; justify-content:space-between; }
.ps-head h4 { font-family: var(--font-sans); font-size: 17px; font-weight: 700; color: #1F2D2B; margin: 0; }
.ps-head .ps-ico { display:flex; gap:10px; color:#5a6b6a; }
.ps-head .ps-ico span { width:18px; height:18px; border-radius:5px; background:#dce8e5; }
.ps-overview { margin: 0 14px 12px; background: #fff; border-radius: 16px; padding: 14px; box-shadow: 0 2px 10px rgba(27,42,74,.06); }
.ps-overview .ps-row { display:flex; justify-content:space-between; padding: 5px 0; font-size:12px; color:#6a7b79; }
.ps-overview .ps-row b { color:#1F2D2B; font-size:14px; font-weight:700; }
.ps-row .inc { color: var(--income); } .ps-row .exp { color: var(--expense); }
.ps-list { flex: 1; padding: 0 14px; overflow: hidden; }
.ps-tx { display:flex; align-items:center; gap:11px; padding: 10px 4px; border-bottom: 1px solid #eef2f0; }
.ps-tx .ps-ic { width:34px; height:34px; border-radius:11px; display:grid; place-items:center; font-size:16px; background:#E4F3F0; }
.ps-tx .ps-mid { flex:1; min-width:0; }
.ps-tx .ps-cat { font-weight:600; font-size:13px; color:#1F2D2B; }
.ps-tx .ps-note { font-size:11px; color:#8a9a98; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.ps-tx .ps-amt { font-weight:700; font-size:13px; }
.ps-tx .ps-amt.exp { color: var(--expense); } .ps-tx .ps-amt.inc { color: var(--income); }
.ps-nav { display:flex; justify-content:space-around; align-items:center; padding: 10px 8px 16px; background:#fff; border-top:1px solid #eef2f0; position:relative; }
.ps-nav span { font-size:10px; color:#9aa9a7; display:flex; flex-direction:column; align-items:center; gap:3px; }
.ps-nav span.on { color: var(--accent-deep); font-weight:700; }
.ps-nav .ps-fab { position:absolute; top:-22px; left:50%; transform:translateX(-50%); width:46px; height:46px; border-radius:50%; background:var(--accent); color:#fff; display:grid; place-items:center; font-size:24px; box-shadow:0 8px 18px rgba(43,167,158,.45); }

/* ---------- 信任条 ---------- */
.trustbar { background: var(--ink); color: #fff; padding: 30px 0; }
.trustbar .wrap { display:flex; gap: 40px; flex-wrap:wrap; justify-content:center; text-align:center; }
.trustbar div { min-width: 150px; }
.trustbar b { display:block; font-family: var(--font-display); font-size: 30px; color:#fff; }
.trustbar span { font-size: 14px; color: rgba(255,255,255,.72); }

/* ---------- 功能卡 ---------- */
.features-grid { display:grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.fcard {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 28px;
  box-shadow: var(--shadow-sm); transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
  position: relative; overflow: hidden;
}
.fcard:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: #d9d7cc; }
.fcard .ficon { width: 52px; height: 52px; border-radius: 14px; background: var(--accent-soft); color: var(--accent-deep); display:grid; place-items:center; margin-bottom: 18px; }
.fcard .ficon svg { width: 26px; height: 26px; }
.fcard h3 { font-size: 21px; margin-bottom: 10px; }
.fcard p { color: var(--muted); font-size: 15.5px; margin: 0; }
.fcard .fnum { position:absolute; right:18px; top:14px; font-family: var(--font-display); font-size: 40px; color: var(--line); font-weight:600; }

/* ---------- 隐私安全专题 ---------- */
.privacy { background: var(--ink); color: #fff; }
.privacy .section-head h2, .privacy .section-head p { color: #fff; }
.privacy .section-head p { color: rgba(255,255,255,.72); }
.privacy .eyebrow { color: #7FE3DA; }
.privacy-grid { display:grid; grid-template-columns: repeat(2,1fr); gap: 20px; max-width: 920px; margin: 0 auto; }
.pcard { background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius); padding: 26px 26px; }
.pcard .picon { width:44px; height:44px; border-radius:12px; background: rgba(127,227,218,.16); color:#7FE3DA; display:grid; place-items:center; margin-bottom:14px; }
.pcard .picon svg { width:22px; height:22px; }
.pcard h3 { color:#fff; font-size:19px; margin-bottom:8px; }
.pcard p { color: rgba(255,255,255,.7); font-size:15px; margin:0; }
.privacy-statement { text-align:center; margin-top: 50px; }
.privacy-statement .big { font-family: var(--font-display); font-size: clamp(26px,4vw,40px); color:#fff; max-width:760px; margin:0 auto; line-height:1.3; }
.privacy-statement .big em { color:#7FE3DA; font-style: normal; }
.privacy-note { text-align:center; margin-top:18px; font-size:13px; color: rgba(255,255,255,.5); }

/* ---------- 多语言 ---------- */
.lang-layout { display:grid; grid-template-columns: .85fr 1.15fr; gap: 50px; align-items:center; }
.lang-copy h2 { font-size: clamp(28px,4vw,40px); }
.lang-copy p { color: var(--muted); font-size:18px; margin:18px 0 26px; }
.lang-chips { display:flex; flex-wrap:wrap; gap:10px; }
.lang-chips span { background: var(--card); border:1px solid var(--line); border-radius:999px; padding:9px 16px; font-size:14px; font-weight:500; color:var(--ink-2); box-shadow: var(--shadow-sm); }
.lang-wall { display:grid; grid-template-columns: repeat(3,1fr); gap:14px; }
.lang-wall figure { margin:0; background:#fff; border:1px solid var(--line); border-radius:14px; overflow:hidden; box-shadow: var(--shadow-sm); }
.lang-wall img { width:100%; aspect-ratio: 9/19; object-fit: cover; object-position: top; }
.lang-wall figcaption { font-size:12px; color:var(--muted); text-align:center; padding:8px 0; }

/* ---------- Gallery ---------- */
.gallery-grid { display:grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.gitem { background:#fff; border:1px solid var(--line); border-radius: var(--radius-lg); padding: 18px; box-shadow: var(--shadow-sm); transition: transform .3s var(--ease), box-shadow .3s; }
.gitem:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.gitem .frame { border-radius: 16px; overflow:hidden; background:#0E1626; aspect-ratio: 9/19; }
.gitem .frame img { width:100%; height:100%; object-fit: cover; object-position: top; }
.gitem h3 { font-size:18px; margin:16px 0 4px; }
.gitem p { color:var(--muted); font-size:14px; margin:0; }

/* ---------- 下载 ---------- */
.download { background: var(--bg-alt); }
.dl-card { max-width: 860px; margin: 0 auto; background: var(--card); border:1px solid var(--line); border-radius: var(--radius-lg); padding: 54px 48px; text-align:center; box-shadow: var(--shadow-md); }
.dl-card h2 { font-size: clamp(28px,4vw,42px); }
.dl-card p { color: var(--muted); font-size:18px; margin:16px auto 32px; max-width:560px; }
.dl-btns { display:flex; gap:16px; justify-content:center; flex-wrap:wrap; }
.dl-store { display:inline-flex; align-items:center; gap:12px; background: var(--ink); color:#fff; padding: 14px 26px; border-radius:16px; transition: transform .25s var(--ease), box-shadow .25s; }
.dl-store:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.dl-store svg { width:30px; height:30px; }
.dl-store small { display:block; font-size:11px; opacity:.7; line-height:1.1; }
.dl-store b { font-size:17px; font-weight:700; }
.dl-store.ghost { background:#fff; color:var(--ink); border:1px solid var(--line); }
.dl-meta { margin-top: 26px; font-size:14px; color: var(--muted); }
.dl-meta b { color: var(--ink); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { background: var(--card); border:1px solid var(--line); border-radius: 14px; margin-bottom: 14px; overflow:hidden; transition: border-color .2s; }
.faq-item.open { border-color: var(--ink); }
.faq-q { width:100%; text-align:left; background:none; border:0; padding: 22px 24px; font-size:17px; font-weight:600; color:var(--ink); cursor:pointer; display:flex; justify-content:space-between; align-items:center; gap:16px; font-family: var(--font-sans); }
.faq-q .plus { flex:0 0 auto; width:22px; height:22px; position:relative; transition: transform .3s var(--ease); }
.faq-q .plus::before, .faq-q .plus::after { content:""; position:absolute; background: var(--ink); border-radius:2px; }
.faq-q .plus::before { left:0; top:10px; width:22px; height:2px; }
.faq-q .plus::after { left:10px; top:0; width:2px; height:22px; transition: transform .3s var(--ease); }
.faq-item.open .plus::after { transform: rotate(90deg); opacity:0; }
.faq-a { max-height:0; overflow:hidden; transition: max-height .35s var(--ease); }
.faq-a .inner { padding: 0 24px 22px; color: var(--muted); font-size: 15.5px; }

/* ---------- About / Contact ---------- */
.about { background: var(--ink); color:#fff; }
.about .wrap { display:grid; grid-template-columns: 1fr 1fr; gap:50px; align-items:center; }
.about h2 { color:#fff; font-size: clamp(28px,4vw,40px); }
.about p { color: rgba(255,255,255,.74); font-size:18px; margin:18px 0 26px; }
.about .contact-card { background: rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.14); border-radius: var(--radius); padding: 28px; }
.about .contact-card .lbl { font-size:13px; color: rgba(255,255,255,.6); letter-spacing:.1em; text-transform:uppercase; }
.about .contact-card a { color:#7FE3DA; font-size:22px; font-family: var(--font-display); font-weight:600; display:inline-block; margin-top:8px; }
.about .contact-card .pp { display:inline-block; margin-top:20px; font-size:14px; color: rgba(255,255,255,.8); border-bottom:1px solid rgba(255,255,255,.3); }

/* ---------- 页脚 ---------- */
footer { background: #11192B; color: rgba(255,255,255,.6); padding: 54px 0 36px; font-size: 14px; }
.foot-grid { display:flex; justify-content:space-between; gap:40px; flex-wrap:wrap; }
.foot-brand { max-width: 320px; }
.foot-brand .brand { color:#fff; margin-bottom:14px; }
.foot-brand p { margin:0; line-height:1.6; }
.foot-cols { display:flex; gap: 56px; flex-wrap:wrap; }
.foot-cols h5 { color:#fff; font-family: var(--font-sans); font-size:14px; margin:0 0 14px; letter-spacing:.04em; }
.foot-cols a { display:block; padding:5px 0; color: rgba(255,255,255,.6); transition: color .2s; }
.foot-cols a:hover { color:#fff; }
.foot-bottom { margin-top: 40px; padding-top: 22px; border-top:1px solid rgba(255,255,255,.12); display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; }

/* ---------- 滚动渐显 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 50px; }
  .hero-visual { order: -1; }
  .features-grid { grid-template-columns: repeat(2,1fr); }
  .lang-layout { grid-template-columns: 1fr; gap: 36px; }
  .about .wrap { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  section { padding: 68px 0; }
  .nav-links { position: fixed; top: 74px; left: 0; right: 0; background: var(--bg); border-bottom:1px solid var(--line);
    flex-direction: column; gap: 0; padding: 8px 24px 18px; transform: translateY(-130%); transition: transform .3s var(--ease); box-shadow: var(--shadow-md); }
  .nav-links.open { transform: none; }
  .nav-links a { padding: 14px 0; border-bottom: 1px solid var(--line-soft); width:100%; }
  .hamburger { display:flex; }
  .nav-links .btn { margin-top: 12px; }
  .features-grid, .privacy-grid, .lang-wall, .gallery-grid { grid-template-columns: 1fr; }
  .dl-card { padding: 40px 24px; }
  .foot-grid { flex-direction: column; gap: 30px; }
}