/* ───────────────────────────────────────────────────────────────
   墨流し (suminagashi) design language — shared with the 墨渡 app.
   paper / ink / faded ink / one vermilion seal accent.
   Motion: slow blooms, blur→sharp "absorb", ink meeting water.
   ─────────────────────────────────────────────────────────────── */
:root{
  --paper:#f6f2e9;
  --paper-deep:#efe9dc;
  --ink:#1b1b1b;
  --ink-60:#565350;
  --ink-35:#8f8a83;
  --ink-15:#d8d2c6;
  --seal:#b23a2a;            /* 朱印 — tiny accents + 眉批 */
  --trans:#5B5BD6;           /* 譯文 accent（與 App 匯出樣式一致） */
  --pool:#232323;
  --serif:"Noto Serif TC","Songti TC","Hiragino Mincho ProN",Georgia,serif;
  --radius:16px;
  --fs-hero:clamp(64px,10vw,124px);
  --fs-display:clamp(28px,4vw,44px);
  --fs-title:clamp(21px,2.4vw,26px);
  --fs-section:17px;
  --fs-body:16px;
  --fs-label:13px;
  --fs-small:12.5px;
  --lh-body:1.85;
  --maxw:1060px;
}
*{box-sizing:border-box;margin:0}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
html,body{background:var(--paper)}
body{
  font-family:var(--serif);
  color:var(--ink);
  font-size:var(--fs-body);
  line-height:var(--lh-body);
  -webkit-font-smoothing:antialiased;
}
a{color:inherit}
img{max-width:100%}
::selection{background:rgba(178,58,42,.18)}
.on-art{text-shadow:0 0 12px rgba(246,242,233,.95),0 0 26px rgba(246,242,233,.85)}

.glass{
  background:linear-gradient(168deg,rgba(248,245,237,.72),rgba(243,238,227,.55));
  -webkit-backdrop-filter:blur(22px) saturate(1.45);
  backdrop-filter:blur(22px) saturate(1.45);
  border:1px solid rgba(255,255,255,.5);
  border-radius:var(--radius);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.6),inset 0 -1px 0 rgba(216,210,198,.3),
    0 4px 18px rgba(20,18,15,.10),0 16px 50px rgba(20,18,15,.14);
}

/* ── Nav ─────────────────────────────────────────────── */
#nav{
  position:fixed;inset:0 0 auto 0;z-index:50;
  display:flex;align-items:center;gap:26px;
  padding:14px clamp(18px,4vw,44px);
  transition:background .5s,box-shadow .5s;
}
#nav.scrolled{
  background:linear-gradient(168deg,rgba(248,245,237,.82),rgba(243,238,227,.7));
  -webkit-backdrop-filter:blur(18px) saturate(1.4);
  backdrop-filter:blur(18px) saturate(1.4);
  box-shadow:0 1px 0 rgba(216,210,198,.5),0 8px 30px rgba(20,18,15,.08);
}
#nav .brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:18px;text-decoration:none}
#nav .brand img{width:30px;height:30px;border-radius:8px}
#nav .links{display:flex;gap:22px;margin-left:auto;align-items:center}
#nav .links a{font-size:var(--fs-label);letter-spacing:.08em;text-decoration:none;color:var(--ink-60)}
#nav .links a:hover{color:var(--ink)}
#lang-toggle{
  font-family:var(--serif);font-size:var(--fs-label);letter-spacing:.06em;
  border:1px solid var(--ink-15);background:transparent;border-radius:999px;
  padding:4px 14px;cursor:pointer;color:var(--ink-60);
}
#lang-toggle:hover{border-color:var(--ink-35);color:var(--ink)}
@media(max-width:760px){#nav .links a.navlink{display:none}}

/* ── Hero ─────────────────────────────────────────────── */
#hero{
  position:relative;min-height:100svh;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;overflow:hidden;padding:110px 20px 90px;
  }
#hero .art{
  position:absolute;inset:0;
  background:url(bg-suminagashi.jpg) center/cover no-repeat;
}
#flow{position:absolute;inset:0;width:100%;height:100%}
#hero .veil{position:absolute;inset:0;pointer-events:none;background:
  radial-gradient(120% 90% at 50% 8%,rgba(246,242,233,.30),transparent 55%),
  linear-gradient(rgba(246,242,233,.12),rgba(246,242,233,.92) 88%)}
#hero>.inner{position:relative;max-width:820px}
.eyebrow{
  font-size:var(--fs-label);letter-spacing:.34em;color:var(--ink-60);
  text-transform:uppercase;margin-bottom:26px;
}
.eyebrow .seal-dot{color:var(--seal)}
#hero .titlerow{position:relative;display:inline-block}
#hero h1{
  font-size:var(--fs-hero);font-weight:600;letter-spacing:.06em;line-height:1.08;
  text-wrap:balance;
}
#hero .romaji{font-size:var(--fs-label);letter-spacing:.5em;color:var(--ink-35);margin:10px 0 30px;text-transform:uppercase}
#hero .tag{font-size:var(--fs-title);color:var(--ink-60);line-height:1.7;text-wrap:balance}
#hero .herolist{font-size:var(--fs-body);color:var(--ink-60);margin-top:14px;letter-spacing:.02em}
#hero .cta-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-top:44px}
#hero .under{margin-top:22px;font-size:var(--fs-small);color:var(--ink-60);letter-spacing:.05em}
#hero .hint{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);
  color:var(--ink-35);font-size:var(--fs-small);letter-spacing:.28em;animation:hint 3.4s ease-in-out infinite;pointer-events:none}
@keyframes hint{0%,100%{opacity:.3}50%{opacity:.85}}

/* ── Buttons — hover fills like ink absorbing into paper ── */
.btn{
  font-family:var(--serif);font-size:var(--fs-body);text-decoration:none;
  padding:13px 30px;border-radius:999px;cursor:pointer;line-height:1.4;
  display:inline-flex;align-items:center;gap:9px;
  position:relative;overflow:hidden;isolation:isolate;
  transition:color .45s ease,border-color .45s ease,box-shadow .45s ease;
}
.btn::after{
  content:"";position:absolute;inset:0;z-index:-1;border-radius:inherit;
  background:var(--ink);
  clip-path:circle(0% at 50% 120%);
  transition:clip-path .55s cubic-bezier(.3,.7,.2,1);
}
.btn:hover::after{clip-path:circle(140% at 50% 60%)}
.btn-ink{background:var(--ink);color:var(--paper);box-shadow:0 6px 22px rgba(20,18,15,.28)}
.btn-ink::after{background:#000}
.btn-ink:hover{box-shadow:0 10px 30px rgba(20,18,15,.36)}
.btn-ghost{border:1px solid var(--ink-35);color:var(--ink)}
.btn-ghost:hover{color:var(--paper);border-color:var(--ink)}
.btn-seal{border:1px solid rgba(178,58,42,.55);color:var(--seal)}
.btn-seal::after{background:var(--seal)}
.btn-seal:hover{color:var(--paper);border-color:var(--seal)}

.clicols{display:grid;grid-template-columns:1fr 1fr;gap:44px}
.clicols>div{min-width:0}
@media(max-width:820px){.clicols{grid-template-columns:1fr}}

/* ── 比較表（支持區） ── */
table.cmp{width:100%;border-collapse:collapse;font-size:14.5px;line-height:1.8;margin:24px 0}
table.cmp th{font-size:var(--fs-label);letter-spacing:.06em;color:var(--ink-60);text-align:left;
  border-bottom:2px solid var(--ink);padding:10px 12px 10px 0;font-weight:600}
table.cmp td{border-bottom:1px solid var(--ink-15);padding:11px 12px 11px 0;vertical-align:top;color:var(--ink-60)}
table.cmp td:first-child{color:var(--ink);font-weight:500}
table.cmp tr:last-child td{border-bottom:none}
.appshot{border-radius:12px;box-shadow:0 18px 50px rgba(20,18,15,.16),0 3px 12px rgba(20,18,15,.08);display:block}
.pillargrid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:34px}
@media(max-width:980px){.pillargrid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.pillargrid{grid-template-columns:1fr}}
.pillargrid a{display:block;text-decoration:none;padding:20px 20px;border:1px solid var(--ink-15);border-radius:12px;
  color:var(--ink);transition:border-color .3s,transform .3s}
.pillargrid a:hover{border-color:var(--seal);transform:translateY(-2px)}
.pillargrid b{display:block;font-size:var(--fs-section);font-weight:600;margin-bottom:6px}
.pillargrid span{font-size:13.5px;color:var(--ink-60);line-height:1.75}
#cli code, .pillcode{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;
  background:var(--pool);color:#e8e2d5;border-radius:8px;display:block;
  padding:14px 18px;overflow-x:auto;white-space:pre;line-height:1.8;
}

/* ── Sections base ────────────────────────────────────── */
section{padding:clamp(70px,10vw,130px) 20px}
.wrap{max-width:var(--maxw);margin:0 auto}
.sec-eyebrow{font-size:var(--fs-label);letter-spacing:.34em;color:var(--seal);margin-bottom:14px;text-transform:uppercase}
h2{font-size:var(--fs-display);font-weight:600;letter-spacing:.04em;line-height:1.3;text-wrap:balance;margin-bottom:14px}
.lede{color:var(--ink-60);max-width:640px;margin-bottom:40px;text-wrap:pretty}

.reveal{opacity:0;filter:blur(8px);transform:translateY(22px);
  transition:opacity 1s ease,filter 1.2s ease,transform 1s cubic-bezier(.2,.8,.3,1)}
.reveal.in{opacity:1;filter:blur(0);transform:none}

/* ── Demo（書頁 + 讀者切換） ───────────────────────────── */
#demo{background:linear-gradient(var(--paper),var(--paper-deep) 60%,var(--paper))}
#demo .stage{display:grid;grid-template-columns:minmax(0,330px) minmax(0,1fr);gap:34px;align-items:start}
@media(max-width:880px){#demo .stage{grid-template-columns:1fr}}
.profile-card{padding:26px 28px}
.profile-card .plabel{font-size:var(--fs-label);letter-spacing:.22em;color:var(--ink-60);margin-bottom:14px}
.ptabs{display:flex;flex-direction:column;gap:10px}
.ptab{
  font-family:var(--serif);font-size:14.5px;text-align:left;line-height:1.8;
  background:transparent;border:1px solid var(--ink-15);border-radius:10px;
  padding:12px 16px;cursor:pointer;color:var(--ink-60);
  transition:border-color .35s,color .35s,background .35s;
}
.ptab:hover{border-color:var(--ink-35);color:var(--ink)}
.ptab[aria-pressed="true"]{
  border-color:rgba(178,58,42,.5);color:var(--ink);
  background:rgba(178,58,42,.05);
}
.ptab .who{display:block;font-weight:600;font-size:var(--fs-label);letter-spacing:.1em;margin-bottom:2px}
.ptab[aria-pressed="true"] .who{color:var(--seal)}
.profile-card .pnote{font-size:var(--fs-small);color:var(--ink-35);margin-top:16px;line-height:1.8}
.bookpage{
  background:#fbf8f1;border:1px solid rgba(216,210,198,.55);border-radius:6px;
  box-shadow:0 1px 0 rgba(255,255,255,.8) inset,0 18px 50px rgba(20,18,15,.13),0 3px 12px rgba(20,18,15,.07);
  padding:clamp(28px,5vw,58px) clamp(24px,6vw,66px);
  min-height:520px;position:relative;
}
.bookpage .folio{position:absolute;top:18px;right:26px;font-size:var(--fs-small);color:var(--ink-35);letter-spacing:.2em}
/* 書口式直排題簽 */
.bookpage .spine-label{
  position:absolute;top:64px;right:8px;
  writing-mode:vertical-rl;font-size:var(--fs-small);letter-spacing:.5em;
  color:var(--ink-15);user-select:none;
}
.seg{margin-bottom:8px}
.seg .src{line-height:1.9}
.seg .trans{
  color:#222;margin:.35em 0 1.1em;padding-left:.7em;
  border-left:2px solid var(--trans);line-height:1.95;
}
.seg .note{
  font-size:14px;color:#5c2d24;background:rgba(178,58,42,.055);
  border:1px solid rgba(178,58,42,.16);border-radius:4px;
  padding:10px 14px;margin:.2em 0 1.3em;line-height:1.85;
}
.seg .note .note-tag{
  color:var(--seal);font-size:var(--fs-small);letter-spacing:.18em;
  display:block;margin-bottom:2px;
}
.seg .src,.seg .trans,.seg .note{opacity:0;filter:blur(7px);transform:translateY(10px);
  transition:opacity .9s ease,filter 1.1s ease,transform .9s cubic-bezier(.2,.8,.3,1)}
.seg .on{opacity:1;filter:blur(0);transform:none}
.seg .note.fading{opacity:0;filter:blur(7px);transform:translateY(-6px)}
#replay{margin-top:22px;background:transparent;border:1px solid var(--ink-15);border-radius:999px;
  font-family:var(--serif);font-size:var(--fs-label);letter-spacing:.1em;color:var(--ink-60);
  padding:7px 20px;cursor:pointer}
#replay:hover{border-color:var(--ink-35);color:var(--ink)}

/* ── 三步 ─────────────────────────────────────────────── */
#how .steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:820px){#how .steps{grid-template-columns:1fr}}
.step{padding:30px 28px}
.step .no{
  width:34px;height:34px;border-radius:50%;border:1px solid var(--seal);color:var(--seal);
  display:flex;align-items:center;justify-content:center;font-size:15px;margin-bottom:16px;
}
.step h3{font-size:var(--fs-section);font-weight:600;margin-bottom:8px}
.step p{font-size:15px;color:var(--ink-60);line-height:1.9}

/* ── Features ─────────────────────────────────────────── */
#features{background:
  radial-gradient(900px 500px at 85% 0%,rgba(91,91,214,.05),transparent 60%),
  radial-gradient(900px 600px at 0% 100%,rgba(178,58,42,.05),transparent 55%),
  var(--paper)}
.fgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:980px){.fgrid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.fgrid{grid-template-columns:1fr}}
.fcard{padding:30px 28px;position:relative;transition:transform .5s cubic-bezier(.2,.8,.3,1),box-shadow .5s}
.fcard:hover{transform:translateY(-4px);box-shadow:inset 0 1px 0 rgba(255,255,255,.6),inset 0 -1px 0 rgba(216,210,198,.3),0 8px 26px rgba(20,18,15,.13),0 22px 60px rgba(20,18,15,.16)}
.fcard h3{font-size:var(--fs-section);font-weight:600;margin-bottom:10px;letter-spacing:.03em}
.fcard p{font-size:14.5px;color:var(--ink-60);line-height:1.9}
.fcard .new{
  position:absolute;top:22px;right:22px;font-size:11px;letter-spacing:.14em;
  color:var(--seal);border:1px solid rgba(178,58,42,.4);border-radius:3px;padding:1px 7px;
}

/* ── Download ─────────────────────────────────────────── */
#download .panel{padding:clamp(34px,5vw,54px);display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center}
#download .panel>div{min-width:0}
@media(max-width:880px){#download .panel{grid-template-columns:1fr}}
#download .dl-note{font-size:var(--fs-small);color:var(--ink-35);margin-top:16px;line-height:1.9}
#download code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;
  background:var(--pool);color:#e8e2d5;border-radius:8px;display:block;
  padding:14px 18px;overflow-x:auto;white-space:pre;line-height:1.8;
}
#download .cli-label{font-size:var(--fs-label);letter-spacing:.2em;color:var(--ink-60);margin-bottom:10px}

/* ── Notice panel ─────────────────────────────────────── */
/* Replaces the waitlist block. The desktop app collects no email, so the
   form, its consent copy and its status line are gone with it — along with
   the privacy-policy obligation that collecting an address would have
   created. */
.notice-panel{max-width:640px;margin:0 auto;text-align:center;padding:clamp(34px,5vw,54px)}
.notice-lede{color:var(--ink-60);margin:0 auto 26px;max-width:480px}

/* ── Open source ──────────────────────────────────────── */
#opensource{background:linear-gradient(var(--paper),var(--paper-deep) 55%,var(--paper))}
#opensource .cols{display:grid;grid-template-columns:1fr 1fr;gap:44px}
@media(max-width:820px){#opensource .cols{grid-template-columns:1fr}}
#opensource p{color:var(--ink-60);margin-bottom:16px;text-wrap:pretty}
#opensource strong{color:var(--ink);font-weight:600}

/* ── 清明上河圖長卷帶（App 同款：整卷無限水平循環） ────── */
#scrollband{
  height:clamp(110px,16vw,170px);
  background:url(bg-qingming.jpg) repeat-x;
  background-size:auto 100%;
  animation:handscroll 240s linear infinite;
  box-shadow:inset 0 14px 26px -14px rgba(20,18,15,.35),inset 0 -14px 26px -14px rgba(20,18,15,.35);
}
@keyframes handscroll{from{background-position:0 0}to{background-position:-4738px 0}}

/* ── Sponsor ──────────────────────────────────────────── */
#sponsor{position:relative;overflow:hidden}
#sponsor .panel{padding:clamp(34px,5vw,54px);max-width:760px;margin:0 auto;text-align:center}
#sponsor .panel p{color:var(--ink-60);max-width:560px;margin:0 auto 12px;text-wrap:pretty}
#sponsor .sp-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:30px}
#sponsor .sp-note{font-size:var(--fs-small);color:var(--ink-35);margin-top:24px}

/* ── FAQ ──────────────────────────────────────────────── */
#faq details{border-bottom:1px solid var(--ink-15);padding:20px 4px}
#faq summary{cursor:pointer;font-size:var(--fs-section);font-weight:500;list-style:none;display:flex;justify-content:space-between;gap:20px}
#faq summary::-webkit-details-marker{display:none}
#faq summary::after{content:"＋";color:var(--ink-35);transition:transform .3s}
#faq details[open] summary::after{transform:rotate(45deg)}
#faq details p{color:var(--ink-60);margin-top:12px;max-width:680px;font-size:15px}
#faq a{color:var(--seal)}

/* ── Footer ───────────────────────────────────────────── */
footer{background:var(--pool);color:#b7b1a4;padding:56px 20px 46px}
footer .wrap{display:flex;gap:30px;align-items:center;flex-wrap:wrap}
footer .fbrand{display:flex;align-items:center;gap:12px;color:#e8e2d5;font-size:17px;font-weight:600}
footer .fbrand img{width:34px;height:34px;border-radius:9px}
footer .flinks{margin-left:auto;display:flex;gap:24px;font-size:var(--fs-label);letter-spacing:.08em}
footer a{color:#b7b1a4;text-decoration:none}
footer a:hover{color:#e8e2d5}
footer .legal{width:100%;font-size:var(--fs-small);color:#7b766c;margin-top:8px;line-height:1.9}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.seg .src,.seg .trans,.seg .note{opacity:1;filter:none;transform:none}
  #flow{display:none}
}
.btn:focus-visible,#lang-toggle:focus-visible,#replay:focus-visible,.ptab:focus-visible,a:focus-visible,summary:focus-visible{
  outline:2px solid var(--seal);outline-offset:3px;border-radius:4px}


/* ── 安裝屏終端機 ── */
.termwrap{max-width:760px}
.term{padding:0;overflow:hidden;background:var(--pool);border-radius:14px;border:1px solid rgba(255,255,255,.08)}
.termbar{display:flex;gap:7px;padding:12px 14px;background:rgba(255,255,255,.04)}
.termbar span{width:11px;height:11px;border-radius:50%;background:#5a564e}
.termbar span:first-child{background:#b23a2a}
.term pre{margin:0;padding:18px 20px 22px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:13.5px;line-height:1.9;color:#e8e2d5;white-space:pre-wrap;min-height:9.5em}
.term .tp{color:#8f8a83}
.term .tc{color:#e8e2d5}
.term .to{color:#9ab89a}
#copy-install{margin-top:16px}
/* 對照 demo */
#tdemo-body .tpair{margin-bottom:22px}
#tdemo-body .tsrc{line-height:1.9;margin-bottom:8px}
#tdemo-body .tv{padding-left:.7em;border-left:2px solid var(--trans);margin:.3em 0;line-height:1.95;color:#222}
#tdemo-body .tv b{font-size:var(--fs-label);letter-spacing:.12em;color:var(--ink-35);font-weight:600;display:block}