/* ============================================================
   砚边 · 官网样式
   纸、墨、朱砂与山川。与桌面端同一套设计令牌。
   ============================================================ */

:root {
  /* 色 */
  --bg: #f1ece1;
  --bg-deep: #e9e2d4;
  --panel: #f7f3e9;
  --panel-raised: #fcf9f2;
  --panel-soft: #ede7d9;
  --ink: #202822;
  --ink-2: #414c43;
  --muted: #6f6759;
  --faint: #9a9080;
  --line: #ddd4c2;
  --line-strong: #c9bea8;
  --accent: #a8432f;
  --accent-deep: #873322;
  --accent-soft: #f2e2da;
  --green: #53675a;
  --green-deep: #2c3a31;
  --gold: #a98750;

  /* 字 */
  --ui: "Microsoft YaHei UI", "PingFang SC", "Noto Sans SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", "Source Han Serif SC", serif;
  --brush: "STKaiti", "KaiTi", "Kaiti SC", "Songti SC", serif;

  /* 尺 */
  --wrap: 1140px;
  --narrow: 760px;
  --r-s: 8px;
  --r-m: 14px;
  --r-l: 22px;
  --sh-s: 0 2px 10px rgba(57, 45, 29, .05);
  --sh-m: 0 14px 36px -14px rgba(57, 45, 29, .22);
  --sh-l: 0 34px 80px -28px rgba(45, 36, 24, .34);
  --ease: cubic-bezier(.2, .8, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 15px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 纸的纤维 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9000;
  pointer-events: none;
  opacity: .028;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
code {
  font-family: "Cascadia Mono", "Consolas", "Menlo", monospace;
  font-size: .86em;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
  color: var(--ink-2);
}
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.ic { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; flex: 0 0 auto; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 32px; }
.wrap.narrow { max-width: var(--narrow); }

/* ---------- 顶栏 ---------- */
.nav {
  position: sticky; top: 0; z-index: 200;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s var(--ease), background .25s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--line); background: color-mix(in srgb, var(--bg) 92%, transparent); }
.nav-inner {
  max-width: var(--wrap); margin: 0 auto; padding: 0 32px;
  height: 64px; display: flex; align-items: center; gap: 26px;
}
.brand { display: inline-flex; align-items: center; gap: 9px; }
.brand-seal {
  width: 30px; height: 30px; border-radius: 7px;
  display: grid; place-items: center;
  background: linear-gradient(160deg, #b74d37, var(--accent-deep));
  color: #fdf6e8;
  font-family: var(--brush);
  font-size: 18px;
  line-height: 1;
  box-shadow: inset 0 0 0 1px rgba(255, 246, 232, .28), 0 2px 6px rgba(120, 45, 30, .28);
}
.brand-name { font-family: var(--serif); font-size: 17px; font-weight: 600; letter-spacing: .18em; }
.nav-links { margin-left: auto; display: flex; gap: 24px; }
.nav-links a {
  font-size: 13px; color: var(--muted); letter-spacing: .04em;
  padding: 4px 0; position: relative; transition: color .18s var(--ease);
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 1px;
  background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .24s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-cta {
  padding: 7px 18px; border-radius: 999px;
  background: var(--ink); color: var(--panel-raised);
  font-size: 12.5px; letter-spacing: .08em;
  transition: background .2s var(--ease), transform .2s var(--ease);
}
.nav-cta:hover { background: var(--accent); transform: translateY(-1px); }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  padding: 78px 0 0;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: -20% -10% auto -10%; height: 120%;
  background:
    radial-gradient(60% 46% at 22% 12%, rgba(168, 67, 47, .07), transparent 68%),
    radial-gradient(52% 44% at 82% 4%, rgba(83, 103, 90, .10), transparent 70%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  display: grid; grid-template-columns: 1.02fr 1fr; gap: 54px; align-items: center;
  padding-bottom: 54px;
}
.eyebrow {
  margin: 0 0 18px;
  font-size: 10.5px; letter-spacing: .26em; text-transform: uppercase;
  color: var(--faint); display: flex; align-items: center; gap: 9px;
}
.eyebrow.center { justify-content: center; }
.eyebrow .dot {
  width: 5px; height: 5px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 4px rgba(168, 67, 47, .12);
}
.hero-title {
  margin: 0 0 22px;
  font-family: var(--serif);
  font-size: clamp(2.05rem, 4.3vw, 3.2rem);
  font-weight: 600; line-height: 1.18; letter-spacing: .01em;
}
.hero-title .ht-brand {
  display: block;
  font-size: .54em; font-weight: 500; letter-spacing: .18em;
  color: var(--muted); margin-bottom: .22em;
}
.hero-title .ht-tag {
  display: block;
  font-family: var(--brush); font-weight: 400; letter-spacing: .05em;
}
.hero-title .sep { color: var(--accent); margin-left: .06em; font-weight: 400; }
.hero-lede {
  margin: 0 0 30px;
  font-size: 15.5px; line-height: 1.95; color: var(--ink-2);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }
.hero-meta {
  display: flex; flex-wrap: wrap; gap: 8px 20px;
  margin: 0; padding: 0; list-style: none;
  font-size: 12px; color: var(--faint); letter-spacing: .03em;
}
.hero-meta li { position: relative; padding-left: 13px; }
.hero-meta li::before {
  content: ""; position: absolute; left: 0; top: .62em;
  width: 4px; height: 4px; border-radius: 50%; background: var(--line-strong);
}

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 46px; padding: 0 26px; border-radius: 999px;
  font-size: 13.5px; letter-spacing: .06em; cursor: pointer;
  border: 1px solid transparent;
  transition: transform .2s var(--ease), background .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.btn .ic { width: 16px; height: 16px; }
.btn-primary { background: var(--accent); color: #fdf6e8; box-shadow: 0 10px 24px -12px rgba(135, 51, 34, .8); }
.btn-primary:hover { background: var(--accent-deep); transform: translateY(-2px); box-shadow: 0 16px 30px -14px rgba(135, 51, 34, .85); }
.btn-ghost { background: transparent; color: var(--ink-2); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--ink-2); color: var(--ink); transform: translateY(-2px); }
.btn.wide { width: 100%; margin-top: auto; }

/* 首屏图 */
.hero-shot {
  margin: 0; position: relative;
  border-radius: 14px;
  background: linear-gradient(180deg, #fffdf7, #f6eeda);
  padding: 11px;
  border: 1px solid var(--line-strong);
  box-shadow: 0 1px 0 #fff inset, 0 2px 0 rgba(255, 255, 255, .6), var(--sh-l);
}
.hero-shot img { border-radius: 8px; border: 1px solid var(--line); background: #fff; }
.hero-shot figcaption {
  display: flex; align-items: center; justify-content: space-between;
  padding: 11px 7px 3px; font-size: 11.5px; color: var(--faint); letter-spacing: .06em;
}
.hero-shot figcaption em {
  font-style: normal; font-family: var(--ui); font-size: 10.5px;
  color: var(--gold); border: 1px solid color-mix(in srgb, var(--gold) 40%, var(--line));
  border-radius: 999px; padding: 1px 9px;
}

/* 数字带 */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  margin: 0; padding: 30px 0 0; list-style: none;
  border-top: 1px solid var(--line);
}
.stats li { text-align: center; padding: 6px 10px; border-right: 1px solid var(--line); }
.stats li:last-child { border-right: 0; }
.stats b {
  display: block; font-family: var(--serif); font-size: 27px; font-weight: 600;
  color: var(--ink); letter-spacing: .02em; line-height: 1.2;
}
.stats span { font-size: 11.5px; color: var(--faint); letter-spacing: .1em; }

/* ---------- 通用区块 ---------- */
.section { padding: 100px 0; }
.section-alt { background: var(--panel); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-head { max-width: 660px; margin: 0 auto 52px; text-align: center; }
.sec-title {
  margin: 0 0 16px; font-family: var(--serif); font-weight: 600;
  font-size: clamp(1.55rem, 2.6vw, 2.05rem); letter-spacing: .02em; line-height: 1.35;
}
.sec-title .ver { font-size: .62em; color: var(--accent); font-family: var(--ui); letter-spacing: .06em; vertical-align: .18em; }
.sec-lede { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.9; }

/* ---------- 功能卡 ---------- */
.cards {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
.card {
  position: relative;
  padding: 28px 26px 26px;
  background: var(--panel-raised);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  box-shadow: var(--sh-s);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease), border-color .28s var(--ease);
}
.card::after {
  content: ""; position: absolute; left: 26px; right: 26px; top: 0; height: 1px;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--accent) 55%, transparent), transparent);
  opacity: 0; transition: opacity .3s var(--ease);
}
.card:hover { transform: translateY(-3px); box-shadow: var(--sh-m); border-color: var(--line-strong); }
.card:hover::after { opacity: 1; }
.card-ic {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px; border-radius: 11px;
  background: var(--accent-soft); color: var(--accent-deep);
  margin-bottom: 18px;
}
.card-ic .ic { width: 20px; height: 20px; }
.card h3 { margin: 0 0 9px; font-family: var(--serif); font-size: 16.5px; font-weight: 600; letter-spacing: .02em; }
.card p { margin: 0; font-size: 13.2px; line-height: 1.85; color: var(--muted); }

/* ---------- 截图 ---------- */
.gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.shot { margin: 0; }
.shot.wide { grid-column: 1 / -1; }
.shot img {
  width: 100%; border-radius: var(--r-m);
  border: 1px solid var(--line);
  box-shadow: var(--sh-m);
  background: var(--panel-raised);
  transition: transform .4s var(--ease), box-shadow .4s var(--ease);
}
.shot:hover img { transform: translateY(-3px); box-shadow: var(--sh-l); }
.shot figcaption {
  margin-top: 12px; font-size: 12.5px; color: var(--muted); letter-spacing: .02em;
}
.shot figcaption b { color: var(--ink); font-weight: 600; margin-right: 7px; }

/* ---------- 本地优先 ---------- */
.manifesto { background: var(--bg-deep); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.manifesto .quote {
  margin: 12px 0 22px; text-align: center;
  font-family: var(--serif); font-size: clamp(1.5rem, 2.7vw, 2.1rem);
  font-weight: 600; line-height: 1.6; letter-spacing: .02em;
}
.manifesto .quote-sub { margin: 0 auto; max-width: 620px; text-align: center; color: var(--muted); font-size: 14.5px; }
.promise {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 26px;
  margin: 30px 0 0; padding: 0; list-style: none;
  font-size: 13px; color: var(--ink-2);
}
.promise li { display: inline-flex; align-items: center; gap: 7px; }
.promise .ic { width: 15px; height: 15px; color: var(--green); stroke-width: 2; }

/* ---------- 下载 ---------- */
.downloads { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-bottom: 46px; }
.dl-card {
  position: relative; display: flex; flex-direction: column;
  padding: 32px 30px 30px;
  background: var(--panel-raised); border: 1px solid var(--line);
  border-radius: var(--r-l); box-shadow: var(--sh-s);
  transition: box-shadow .3s var(--ease), transform .3s var(--ease);
}
.dl-card:hover { box-shadow: var(--sh-m); transform: translateY(-2px); }
.dl-tag {
  position: absolute; top: 22px; right: 24px;
  font-size: 10px; letter-spacing: .16em;
  color: var(--accent-deep); background: var(--accent-soft);
  border-radius: 999px; padding: 3px 11px;
}
.dl-tag.alt { color: var(--green-deep); background: color-mix(in srgb, var(--green) 14%, var(--panel)); }
.dl-card h3 { margin: 0 0 10px; font-family: var(--serif); font-size: 21px; font-weight: 600; }
.dl-desc { margin: 0 0 18px; font-size: 13.4px; color: var(--muted); line-height: 1.85; }
.dl-list { margin: 0 0 26px; padding: 0; list-style: none; font-size: 12.8px; color: var(--ink-2); }
.dl-list li { position: relative; padding-left: 16px; margin-bottom: 7px; line-height: 1.7; }
.dl-list li::before {
  content: ""; position: absolute; left: 2px; top: .72em;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--line-strong);
}
.sysreq {
  display: grid; grid-template-columns: 1fr 1fr; gap: 30px;
  padding-top: 34px; border-top: 1px solid var(--line);
}
.sysreq b { display: block; font-size: 12.5px; letter-spacing: .1em; color: var(--gold); margin-bottom: 8px; }
.sysreq p { margin: 0; font-size: 12.8px; color: var(--muted); line-height: 1.85; }

/* ---------- FAQ ---------- */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: flex-start; gap: 16px;
  padding: 22px 4px;
  font-family: var(--serif); font-size: 15.6px; font-weight: 600; letter-spacing: .01em;
  transition: color .18s var(--ease);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; margin-left: auto; flex: 0 0 auto;
  font-family: var(--ui); font-weight: 400; font-size: 19px; line-height: 1;
  color: var(--faint); transition: transform .24s var(--ease), color .24s var(--ease);
}
.faq details[open] summary::after { transform: rotate(45deg); color: var(--accent); }
.faq summary:hover { color: var(--accent-deep); }
.faq-body { padding: 0 4px 24px; }
.faq-body p { margin: 0 0 10px; font-size: 13.6px; color: var(--muted); line-height: 1.95; }
.faq-body p:last-child { margin-bottom: 0; }
.faq details[open] .faq-body { animation: faqIn .26s var(--ease); }
@keyframes faqIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }

/* ---------- 隐私带 ---------- */
.privacy-band {
  padding: 72px 0;
  background: var(--panel);
  border-top: 1px solid var(--line);
}
.privacy-band h2 {
  margin: 0 0 18px; font-family: var(--serif); font-size: 20px; font-weight: 600;
  letter-spacing: .06em;
}
.privacy-line { margin: 0 0 8px; font-size: 13.4px; color: var(--muted); line-height: 1.9; }
.privacy-line b { color: var(--ink); font-weight: 600; margin-right: 4px; }
.text-link {
  display: inline-block; margin-top: 16px;
  font-size: 13px; color: var(--accent-deep);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  padding-bottom: 2px;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.text-link:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- 页脚 ---------- */
.foot { background: var(--green-deep); color: #ded6c4; padding: 46px 0 40px; }
.foot-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 22px 40px; }
.foot-brand { display: flex; align-items: center; gap: 11px; }
.foot-brand b { display: block; font-family: var(--serif); font-size: 15px; letter-spacing: .2em; color: #f3ece0; }
.foot-brand span { font-size: 11px; color: #9aa595; letter-spacing: .06em; }
.foot-links { margin-left: auto; display: flex; flex-wrap: wrap; gap: 20px; }
.foot-links a { font-size: 12.5px; color: #b9c2b3; transition: color .18s var(--ease); }
.foot-links a:hover { color: #f3ece0; }
.foot-copy {
  flex: 1 0 100%; margin: 18px 0 0; padding-top: 20px;
  border-top: 1px solid rgba(222, 214, 196, .14);
  font-size: 11.5px; color: #8d998a; letter-spacing: .04em;
}

/* ---------- 内页（隐私与版权） ---------- */
.page-head {
  padding: 64px 0 40px;
  background:
    radial-gradient(58% 60% at 18% 0%, rgba(168, 67, 47, .07), transparent 70%),
    radial-gradient(50% 60% at 84% 6%, rgba(83, 103, 90, .09), transparent 72%);
  border-bottom: 1px solid var(--line);
}
.page-head h1 {
  margin: 0 0 18px; font-family: var(--serif);
  font-size: clamp(1.8rem, 3.4vw, 2.5rem); font-weight: 600; letter-spacing: .03em;
}
.page-lede { margin: 0 0 14px; font-size: 15px; color: var(--ink-2); line-height: 1.95; }
.page-lede b { color: var(--ink); }
.meta { margin: 0; font-size: 11.5px; color: var(--faint); letter-spacing: .05em; }

.legal { padding: 56px 0 80px; }
.legal h2 {
  margin: 44px 0 14px; padding-top: 8px;
  font-family: var(--serif); font-size: 18px; font-weight: 600;
  letter-spacing: .06em; color: var(--ink);
  border-top: 1px solid var(--line);
  padding-top: 26px;
}
.legal h2:first-child { margin-top: 0; border-top: 0; padding-top: 0; }
.legal p { margin: 0 0 12px; font-size: 14px; color: var(--ink-2); line-height: 1.95; }
.legal ul { margin: 0 0 14px; padding-left: 20px; }
.legal li { margin-bottom: 7px; font-size: 14px; color: var(--ink-2); line-height: 1.9; }
.legal b { color: var(--ink); font-weight: 600; }
.legal .notice {
  margin: 18px 0 20px; padding: 18px 20px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-s) var(--r-s) 0;
}
.legal .notice p { margin: 0; color: var(--accent-deep); font-size: 14.5px; }
.muted-note { font-size: 12.8px !important; color: var(--faint) !important; }
.legal-foot {
  margin-top: 46px !important; padding-top: 24px;
  border-top: 1px solid var(--line);
  font-family: var(--serif); font-size: 13px !important;
  color: var(--faint) !important; letter-spacing: .12em; text-align: center;
}

/* ---------- 滚动出现 ---------- */
.reveal { opacity: 0; transform: translateY(14px); }
.reveal.in { opacity: 1; transform: none; transition: opacity .7s var(--ease), transform .7s var(--ease); }

/* ════════════════════════════════════════════════════
   古韵层：墨线、远山、云气、竖签、印章、灯
   ════════════════════════════════════════════════════ */

/* 右侧一卷墨线：随滚动生长 */
.ink-progress {
  position: fixed; right: 22px; top: 15vh; height: 70vh; width: 2px;
  background: color-mix(in srgb, var(--line-strong) 42%, transparent);
  border-radius: 2px; z-index: 150; pointer-events: none;
}
.ink-progress-fill {
  position: relative; display: block; width: 100%; height: 0;
  background: linear-gradient(180deg, color-mix(in srgb, var(--ink) 42%, transparent), color-mix(in srgb, var(--accent) 85%, transparent));
  border-radius: 2px;
  transition: height .1s linear;
}
.ink-progress-fill::after {
  content: ""; position: absolute; left: 50%; bottom: -3px;
  width: 6px; height: 6px; border-radius: 50%; transform: translateX(-50%);
  background: var(--accent);
  box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 65%, transparent);
}

/* 首屏：墨点 canvas、云气、远山 */
.hero { position: relative; overflow: hidden; }
.ink-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 0; opacity: .6;
}
.hero-mist { position: absolute; inset: 0; overflow: hidden; pointer-events: none; z-index: 0; }
.mist { position: absolute; border-radius: 50%; filter: blur(46px); will-change: transform; }
.mist-1 {
  width: 620px; height: 320px; left: -8%; top: 16%;
  background: radial-gradient(circle, rgba(83, 103, 90, .17), transparent 70%);
  animation: drift1 46s ease-in-out infinite;
}
.mist-2 {
  width: 720px; height: 380px; right: -10%; top: 4%;
  background: radial-gradient(circle, rgba(168, 67, 47, .10), transparent 70%);
  animation: drift2 58s ease-in-out infinite;
}
@keyframes drift1 { 0%, 100% { transform: translate3d(0, 0, 0); } 50% { transform: translate3d(44px, -26px, 0); } }
@keyframes drift2 { 0%, 100% { transform: translate3d(0, 0, 0); } 50% { transform: translate3d(-52px, 22px, 0); } }

.mountains {
  position: absolute; left: 0; right: 0; bottom: 58px; height: 195px;
  pointer-events: none; z-index: 0;
}
.mt { position: absolute; left: 0; bottom: 0; width: 100%; }
.mt-far { height: 156px; fill: color-mix(in srgb, var(--green) 13%, transparent); }
.mt-mid { height: 122px; fill: color-mix(in srgb, var(--green) 19%, transparent); }
.mt-near { height: 88px; fill: color-mix(in srgb, var(--green-deep) 13%, transparent); }
.hero .stats { position: relative; z-index: 2; }

/* 右侧竖签 */
.verse {
  position: absolute; right: 26px; top: 104px; z-index: 3;
  writing-mode: vertical-rl; text-orientation: upright;
  display: flex; gap: 9px; align-items: flex-start;
  font-family: var(--brush); font-size: 13px; color: var(--faint);
  letter-spacing: .3em;
}
.verse-line { padding: 8px 2px; border-left: 1px solid color-mix(in srgb, var(--line-strong) 55%, transparent); }
.verse-seal {
  font-style: normal; font-family: var(--brush);
  width: 20px; height: 20px; display: grid; place-items: center;
  margin-top: 12px; border-radius: 3px;
  background: var(--accent); color: #fdf6e8; font-size: 12px; line-height: 1;
  letter-spacing: 0; opacity: .85;
  box-shadow: inset 0 0 0 1px rgba(255, 246, 232, .32);
}

/* 首屏安全提示 */
.safety-hint {
  display: flex; align-items: center; flex-wrap: wrap; gap: 7px;
  margin: 0 0 20px; font-size: 12.6px; color: var(--muted);
}
.safety-hint .ic { width: 15px; height: 15px; color: var(--accent); stroke-width: 1.5; }
.safety-hint a {
  color: var(--accent-deep);
  border-bottom: 1px dashed color-mix(in srgb, var(--accent) 45%, transparent);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.safety-hint a:hover { border-bottom-style: solid; color: var(--accent); }

/* 章节序号与印章 */
.eyebrow .num {
  font-family: var(--brush); font-size: 13px; letter-spacing: 0;
  color: var(--accent); margin-right: 1px; opacity: .9;
}
.sec-head .eyebrow { justify-content: center; }
.eyebrow .seal {
  display: inline-grid; place-items: center; position: relative;
  width: 18px; height: 18px; border-radius: 3px; margin-left: 3px;
  background: var(--accent); color: #fdf6e8;
  font-family: var(--brush); font-size: 11px; line-height: 1; letter-spacing: 0;
  opacity: 0; transform: scale(1.8) rotate(-14deg);
  transition: opacity .55s var(--ease), transform .55s cubic-bezier(.2, 1.7, .4, 1);
  box-shadow: inset 0 0 0 1px rgba(255, 246, 232, .3);
}
.eyebrow .seal::after { content: attr(data-seal); }
.sec-head.is-stamped .seal { opacity: .92; transform: none; }

/* 毛笔分界 */
.brush-rule {
  height: 12px; max-width: var(--wrap); margin: 0 auto; padding: 0 32px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='420' height='12' viewBox='0 0 420 12'%3E%3Cpath d='M2 7C40 3 70 10 110 6S180 2 220 7 290 11 330 6 400 3 418 6' fill='none' stroke='%23c9bea8' stroke-width='1.1' stroke-linecap='round' opacity='.8'/%3E%3C/svg%3E");
  background-repeat: repeat-x; background-position: center; background-size: 420px 12px;
  background-clip: content-box;
}

/* 卡片墨晕 */
.card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: radial-gradient(120% 92% at 18% 0%, rgba(168, 67, 47, .065), transparent 62%);
  opacity: 0; transition: opacity .45s var(--ease);
}
.card:hover::before { opacity: 1; }
.card > * { position: relative; z-index: 1; }

/* 显眼的安全提示 */
.alert {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 22px 24px; margin: 0 0 38px;
  background: linear-gradient(178deg, #fbf2e7, #f8ebdf);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, var(--line));
  border-left: 3px solid var(--accent);
  border-radius: var(--r-m);
  box-shadow: 0 10px 30px -22px rgba(135, 51, 34, .55);
}
.alert-mark {
  flex: 0 0 40px; width: 40px; height: 40px; display: grid; place-items: center;
  border-radius: 11px; color: var(--accent-deep);
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
}
.alert-mark .ic { width: 21px; height: 21px; }
.alert-title {
  display: block; margin-bottom: 8px;
  font-family: var(--serif); font-size: 15.5px; letter-spacing: .02em;
  color: var(--accent-deep);
}
.alert-body p { margin: 0 0 8px; font-size: 13.2px; line-height: 1.92; color: var(--ink-2); }
.alert-body p:last-child { margin-bottom: 0; }
.alert-body b { color: var(--accent-deep); font-weight: 600; }

/* 点灯支持 */
.support-band {
  position: relative; padding: 86px 0; border-top: 1px solid var(--line);
  background:
    radial-gradient(58% 84% at 50% 0%, rgba(168, 67, 47, .085), transparent 72%),
    var(--bg-deep);
  overflow: hidden;
}
.support-inner { display: grid; grid-template-columns: 130px 1fr auto; gap: 34px; align-items: center; }
.lantern { position: relative; width: 96px; height: 150px; justify-self: center; }
.lantern-glow {
  position: absolute; left: 50%; top: 54%; width: 168px; height: 168px;
  transform: translate(-50%, -50%); border-radius: 50%;
  background: radial-gradient(circle, rgba(226, 154, 84, .42), rgba(168, 67, 47, .10) 46%, transparent 72%);
  filter: blur(3px);
  animation: lanternGlow 4.8s ease-in-out infinite;
}
@keyframes lanternGlow {
  0%, 100% { opacity: .55; transform: translate(-50%, -50%) scale(.93); }
  50% { opacity: .95; transform: translate(-50%, -50%) scale(1.06); }
}
.lantern-svg { position: relative; width: 100%; height: 100%; display: block; }
.lantern-string, .lantern-rib, .lantern-tail {
  fill: none; stroke: color-mix(in srgb, var(--gold) 72%, var(--line-strong));
  stroke-width: 1.2; stroke-linecap: round;
}
.lantern-cap, .lantern-tassel { fill: var(--accent); opacity: .92; }
.lantern-body { fill: var(--accent); opacity: .94; }
.lantern-flame {
  fill: #f8cd7c;
  transform-box: fill-box; transform-origin: center bottom;
  filter: drop-shadow(0 0 7px rgba(248, 205, 124, .95));
  animation: flame 2.6s ease-in-out infinite;
}
@keyframes flame {
  0%, 100% { opacity: .82; transform: scale(1); }
  50% { opacity: 1; transform: scaleY(1.1) scaleX(.96); }
}
.support-copy h2 {
  margin: 0 0 9px; font-family: var(--serif);
  font-size: clamp(1.3rem, 2.2vw, 1.6rem); font-weight: 600; letter-spacing: .05em;
}
.support-lede { margin: 0 0 7px; font-size: 14px; color: var(--ink-2); }
.support-note { margin: 0; font-size: 12.5px; color: var(--faint); transition: color .3s var(--ease); }
.support-note.flash { color: var(--accent-deep); animation: noteFlash 1.1s var(--ease) 2; }
@keyframes noteFlash { 0%, 100% { opacity: .6; } 50% { opacity: 1; } }
.support-action { display: flex; flex-direction: column; align-items: center; gap: 9px; }
.support-sub { font-size: 11px; color: var(--faint); letter-spacing: .07em; }
.btn-lantern {
  background: var(--accent); color: #fdf6e8;
  box-shadow: 0 12px 26px -14px rgba(135, 51, 34, .9);
}
.btn-lantern .ic { width: 17px; height: 17px; }
.btn-lantern:hover { background: var(--accent-deep); transform: translateY(-2px); }
.btn-lantern:active { transform: translateY(0) scale(.985); }

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-shot { transform: none; }
  .cards { grid-template-columns: 1fr 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .shot.wide { grid-column: auto; }
  .downloads { grid-template-columns: 1fr; }
  .sysreq { grid-template-columns: 1fr; gap: 22px; }
  .nav-links { display: none; }
  .nav-cta { margin-left: auto; }
}

@media (max-width: 720px) {
  body { font-size: 14.5px; }
  .wrap { padding: 0 20px; }
  .nav-inner { padding: 0 20px; height: 58px; }
  .hero { padding-top: 52px; }
  .section { padding: 68px 0; }
  .cards { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; gap: 18px 0; }
  .stats li:nth-child(2) { border-right: 0; }
  .stats li:nth-child(3), .stats li:nth-child(4) { border-top: 1px solid var(--line); padding-top: 20px; }
  .hero-title { line-height: 1.3; }
  .br-lg { display: none; }
  .foot-inner { flex-direction: column; align-items: flex-start; }
  .foot-links { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .faq details[open] .faq-body { animation: none; }
  .card, .shot img, .dl-card, .btn { transition: none; }
  /* 大幅位移的云气停下；灯焰、墨滴这类极低幅度装饰保留 */
  .mist { animation: none !important; }
}

/* ════════════════════════════════════════════════════
   古韵层的收口与适配
   ════════════════════════════════════════════════════ */
.hero::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 96px;
  background: linear-gradient(180deg, transparent, var(--bg) 88%);
  pointer-events: none; z-index: 1;
}
.hero-grid, .hero .wrap { position: relative; z-index: 2; }

@media (max-width: 1180px) {
  .ink-progress { display: none; }
  .verse { display: none; }
}

@media (max-width: 1000px) {
  .mountains { height: 150px; }
  .mt-far { height: 116px; }
  .mt-mid { height: 92px; }
  .mt-near { height: 66px; }
  .alert { padding: 18px 18px; gap: 13px; }
  .support-inner { grid-template-columns: 1fr; justify-items: center; text-align: center; gap: 22px; }
  .support-action { align-items: center; }
}

@media (max-width: 720px) {
  .brush-rule { display: none; }
  .alert { flex-direction: column; gap: 11px; }
  .alert-title { font-size: 14.5px; }
  .lantern { width: 74px; height: 108px; }
  .mountains { height: 118px; opacity: .85; }
  .support-band { padding: 64px 0; }
  .safety-hint { font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  /* 只停与滚动绑定的墨线；灯焰与墨滴继续，属于极低幅度装饰 */
  .ink-progress { display: none; }
}

/* 首屏墨滴 */
.ink-ripple {
  position: absolute; z-index: 1; pointer-events: none;
  width: 30px; height: 30px; margin: -15px 0 0 -15px;
  border-radius: 46% 54% 49% 51% / 52% 47% 53% 48%;
  background: radial-gradient(circle at 45% 43%, rgba(32, 40, 34, .34), rgba(32, 40, 34, .14) 42%, transparent 72%);
  mix-blend-mode: multiply;
  animation: inkRipple 1.2s cubic-bezier(.16, .72, .28, 1) forwards;
}
@keyframes inkRipple {
  0% { transform: scale(.22) rotate(0deg); opacity: .9; }
  55% { opacity: .34; }
  100% { transform: scale(9.5) rotate(14deg); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) { .ink-ripple { animation-duration: .75s; } }

/* ════════════════════════════════════════════════════
   阅毕闲章
   ════════════════════════════════════════════════════ */
.mine-seal {
  position: fixed; right: 30px; bottom: 92px; z-index: 165;
  width: 52px; height: 52px; border-radius: 7px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0; background: var(--accent); color: #fdf6e8;
  font-family: var(--brush); font-size: 16px; line-height: 1.06; letter-spacing: .04em;
  opacity: 0; transform: scale(1.55) rotate(-12deg); pointer-events: none;
  box-shadow: inset 0 0 0 2px rgba(255, 246, 232, .34), 0 12px 28px -12px rgba(120, 40, 26, .7);
  transition: opacity .5s var(--ease), transform .55s cubic-bezier(.2, 1.6, .4, 1);
}
.mine-seal.show { opacity: .96; transform: none; pointer-events: auto; }
.mine-seal:hover { transform: translateY(-2px) rotate(-2deg); }

/* ════════════════════════════════════════════════════
   V2「浓」：整体加深、提对比、给色彩落点
   ════════════════════════════════════════════════════ */
html.v2 {
  --bg: #eee5d3;
  --bg-deep: #e2d5ba;
  --panel: #f5eddd;
  --panel-raised: #fdf8ee;
  --panel-soft: #e8ddc5;
  --ink: #1a231d;
  --ink-2: #38453c;
  --muted: #665c4c;
  --faint: #948973;
  --line: #d5c7ad;
  --line-strong: #bcaa89;
  --accent: #a13523;
  --accent-deep: #7c2716;
  --accent-soft: #f4e1d6;
  --green: #3f5749;
  --green-deep: #16241d;
  --gold: #a0773a;
  background: var(--bg);
}

/* 顶栏：墨绿压顶，朱砂收边 */
.v2 .nav {
  background: color-mix(in srgb, var(--green-deep) 97%, transparent);
  border-bottom: 1px solid rgba(246, 238, 220, .10);
}
.v2 .nav.scrolled {
  background: var(--green-deep);
  border-bottom-color: color-mix(in srgb, var(--accent) 70%, transparent);
  box-shadow: 0 14px 34px -24px rgba(0, 0, 0, .8);
}
.v2 .brand-name { color: #f4ecda; }
.v2 .nav-links a { color: #bdc7b6; }
.v2 .nav-links a:hover { color: #fdf6e8; }
.v2 .nav-cta { background: #f4ecda; color: var(--green-deep); }
.v2 .nav-cta:hover { background: var(--accent); color: #fdf6e8; }
.v2 .brand-seal { box-shadow: inset 0 0 0 1px rgba(255, 246, 232, .34), 0 4px 14px rgba(0, 0, 0, .45); }

/* 首屏：加一层暖光与青灰，别再是一片平纸 */
.v2 .hero {
  background:
    radial-gradient(72% 56% at 82% 4%, rgba(161, 53, 35, .13), transparent 64%),
    radial-gradient(66% 58% at 4% 26%, rgba(63, 87, 73, .16), transparent 68%),
    linear-gradient(180deg, #f5eddc, var(--bg) 56%);
}
.v2 .hero-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
.v2 .hero-shot { margin-right: -26px; }
.v2 .hero-title .ht-brand { color: var(--accent); letter-spacing: .2em; }
.v2 .hero-title .ht-tag { color: #17201a; }
.v2 .hero-lede { color: #2f3a33; font-size: 15px; }
.v2 .hero-shot { box-shadow: 0 1px 0 #fff inset, 0 40px 80px -34px rgba(60, 44, 22, .55); }

/* 数字带：朱砂数字 */
.v2 .stats b { color: var(--accent); font-size: 30px; }
.v2 .stats span { color: var(--muted); }
.v2 .stats { border-top-color: var(--line-strong); }

/* 章节序号更醒目 */
.v2 .eyebrow .num { font-size: 15px; opacity: 1; }
.v2 .eyebrow { color: var(--muted); }
.v2 .sec-title { color: #16201a; }
.v2 .sec-lede { color: var(--muted); }

/* 卡片：奶白纸面 + 三色图标 */
.v2 .card {
  background: linear-gradient(180deg, #fffdf6, #faf3e5);
  border-color: var(--line);
}
.v2 .card:hover {
  border-color: color-mix(in srgb, var(--accent) 30%, var(--line));
  box-shadow: 0 22px 44px -26px rgba(70, 48, 22, .55);
}
.v2 .card h3 { color: #18221c; }
.v2 .card p { color: var(--muted); }
.v2 .card:nth-child(3n+2) .card-ic { background: color-mix(in srgb, var(--green) 15%, #fffdf6); color: #3b5346; }
.v2 .card:nth-child(3n+3) .card-ic { background: color-mix(in srgb, var(--gold) 18%, #fffdf6); color: #8a652e; }

/* 分区：加深，拉开层次 */
.v2 .section-alt {
  background: linear-gradient(180deg, var(--bg-deep), #ece2cd 60%, var(--bg-deep));
  border-color: var(--line-strong);
}
.v2 .manifesto {
  background:
    radial-gradient(60% 70% at 50% 0%, rgba(161, 53, 35, .07), transparent 70%),
    var(--bg-deep);
  border-color: var(--line-strong);
}
.v2 .manifesto .quote { color: #16201a; }

/* 下载：推荐那张给朱砂底 */
.v2 .dl-card { background: linear-gradient(180deg, #fffdf6, #faf3e5); }
.v2 .dl-card:first-child {
  background: linear-gradient(180deg, #fdf3ea, #f8e9dc);
  border-color: color-mix(in srgb, var(--accent) 26%, var(--line));
}
.v2 .dl-card h3 { color: #18221c; }
.v2 .alert { background: linear-gradient(178deg, #fdf2e6, #f9e7d8); border-color: color-mix(in srgb, var(--accent) 32%, var(--line)); }

/* 点灯：暖光更亮 */
.v2 .support-band {
  background:
    radial-gradient(52% 80% at 22% 40%, rgba(226, 154, 84, .22), transparent 68%),
    radial-gradient(58% 84% at 50% 0%, rgba(161, 53, 35, .12), transparent 72%),
    #e8dcc2;
  border-top-color: var(--line-strong);
}
.v2 .lantern-glow { background: radial-gradient(circle, rgba(236, 168, 92, .55), rgba(161, 53, 35, .14) 46%, transparent 72%); }

/* FAQ 展开时朱砂描边 */
.v2 .faq summary { color: #1b251f; }
.v2 .faq details[open] summary { color: var(--accent-deep); }
.v2 .faq details[open] { border-bottom-color: color-mix(in srgb, var(--accent) 35%, var(--line)); }

/* 隐私带与页脚 */
.v2 .privacy-band { background: var(--panel); border-top-color: var(--line-strong); }
.v2 .foot { background: linear-gradient(180deg, #16241d, #0e1712); }
.v2 .foot-brand b { color: #f5edda; }

/* 远山更实 */
.v2 .mt-far { fill: color-mix(in srgb, var(--green) 21%, transparent); }
.v2 .mt-mid { fill: color-mix(in srgb, var(--green) 27%, transparent); }
.v2 .mt-near { fill: color-mix(in srgb, var(--green-deep) 17%, transparent); }
.v2 .mist-1 { background: radial-gradient(circle, rgba(63, 87, 73, .22), transparent 70%); }
.v2 .mist-2 { background: radial-gradient(circle, rgba(161, 53, 35, .13), transparent 70%); }

@media (max-width: 1000px) {
  .v2 .hero-grid { grid-template-columns: 1fr; }
  .v2 .hero-shot { margin-right: 0; }
}