/* threefaan — main stylesheet */
@font-face { font-family: "Figtree"; src: url("f/figtree.woff2") format("woff2"); font-weight: 400 700; font-display: swap; }
@font-face { font-family: "DM Serif Display"; src: url("f/dm-serif-display.woff2") format("woff2"); font-weight: 400; font-display: swap; }

:root {
  --felt: #164237; --felt-2: #1c5546; --felt-3: #0f2f27;
  --ivory: #f6f0e1; --paper: #fbf8f1; --line: #e4dccb;
  --ink: #1d2a44; --text: #2b2f2d; --muted: #66706b;
  --red: #b8322a; --red-2: #9b2620; --gold: #c9922b; --jade: #2f8a71;
  --serif: "DM Serif Display", Georgia, serif;
  --sans: "Figtree", system-ui, -apple-system, "Segoe UI", sans-serif;
  --cjk: "PingFang HK", "PingFang TC", "Noto Sans CJK TC", "Microsoft JhengHei", sans-serif;
  --r: 14px;
  --shadow: 0 1px 2px rgba(15, 47, 39, .08), 0 8px 24px rgba(15, 47, 39, .08);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font: 17px/1.6 var(--sans); color: var(--text); background: var(--paper); }
img, svg { display: block; }
a { color: var(--red-2); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--red); }
:lang(zh), .zh { font-family: var(--cjk); }
h1, h2, h3 { font-family: var(--serif); font-weight: 400; color: var(--ink); line-height: 1.15; letter-spacing: .005em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.2rem); margin: 0 0 .4em; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin: 2em 0 .5em; }
h3 { font-size: 1.3rem; margin: 1.6em 0 .4em; }
p, ul, ol { margin: 0 0 1em; }
.wrap { width: min(1080px, 100% - 2.5rem); margin-inline: auto; }
.narrow { width: min(720px, 100% - 2.5rem); margin-inline: auto; }
.lede { font-size: 1.15rem; color: var(--muted); max-width: 40em; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; background: #fff; padding: .5rem 1rem; z-index: 9; }

/* ---- header / nav ---- */
.top { background: var(--felt-3); color: var(--ivory); }
.top .wrap { display: flex; align-items: center; gap: 1.5rem; min-height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: .6rem; color: var(--ivory); text-decoration: none; font-family: var(--serif); font-size: 1.45rem; }
.brand img { width: 26px; height: 35px; filter: drop-shadow(0 2px 2px rgba(0,0,0,.3)); transition: transform .3s; }
.brand:hover { color: #fff; }
.brand:hover img { transform: rotate(-6deg) translateY(-1px); }
.nav { display: flex; gap: .2rem; margin-left: auto; flex-wrap: wrap; }
.nav a { color: #cfe0d8; text-decoration: none; font-size: .95rem; padding: .4rem .7rem; border-radius: 999px; transition: background .2s, color .2s; }
.nav a:hover { color: #fff; background: rgba(255,255,255,.08); }
.nav a[aria-current="page"] { color: var(--felt-3); background: var(--ivory); }
@media (max-width: 720px) {
  .top .wrap { gap: .4rem; padding: .6rem 0; }
  .nav { margin-left: 0; width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: .2rem; }
  .nav a { white-space: nowrap; font-size: .9rem; }
}

/* ---- felt hero ---- */
.felt {
  background:
    radial-gradient(1200px 500px at 20% -10%, rgba(255,255,255,.07), transparent 60%),
    radial-gradient(800px 400px at 110% 120%, rgba(0,0,0,.25), transparent 60%),
    linear-gradient(160deg, var(--felt-2), var(--felt) 55%, var(--felt-3));
  color: #e7efe9;
}
.felt h1, .felt h2 { color: var(--ivory); }
.hero { padding: 2.6rem 0 2rem; }
.hero .lede { color: #b9cdc4; }
.page-head { padding: 2.4rem 0 1.6rem; }
.page-head .lede { color: #b9cdc4; margin: 0; }
.crumbs { font-size: .9rem; color: #9fb8ad; margin-bottom: .6rem; }
.crumbs a { color: #cfe0d8; }

/* ---- tiles ---- */
.t { width: 40px; height: 53px; flex: none; filter: drop-shadow(0 1px 1px rgba(15,47,39,.25)); }
.hand { display: flex; flex-wrap: wrap; gap: .55rem; align-items: flex-end; margin: .4rem 0 1rem; }
.hand .set { display: flex; flex-wrap: wrap; gap: 2px; max-width: 100%; }
.hand.big .t { width: 46px; height: 61px; }
.hand.small .t { width: 30px; height: 40px; }
@media (max-width: 520px) { .t { width: 32px; height: 43px; } .hand.big .t { width: 34px; height: 45px; } }

/* ---- calculator ---- */
.calc { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(300px, 1fr); gap: 1.4rem; padding-bottom: 2.6rem; align-items: start; }
@media (max-width: 900px) { .calc { grid-template-columns: minmax(0, 1fr); } }
.panel { background: rgba(6, 26, 21, .35); border: 1px solid rgba(255,255,255,.08); border-radius: var(--r); padding: 1.1rem 1.2rem 1.2rem; }
.panel + .panel { margin-top: 1rem; }
.panel h2 { font-size: 1.2rem; margin: 0 0 .7rem; display: flex; align-items: baseline; gap: .6rem; }
.panel h2 small { font: 500 .8rem var(--sans); color: #9fb8ad; letter-spacing: .02em; }
@media (max-width: 520px) { .panel h2 small { display: none; } }
.tray { min-height: 70px; display: flex; flex-wrap: wrap; gap: .5rem; align-items: flex-end; padding: .6rem; border-radius: 10px;
  background: rgba(0,0,0,.18); box-shadow: inset 0 2px 6px rgba(0,0,0,.25); }
.tray .empty { color: #8fa89d; font-size: .95rem; padding: .7rem .4rem; }
.tray .grp { display: flex; flex-wrap: wrap; gap: 2px; position: relative; padding: 0 0 1.1rem; max-width: 100%; }
.tray .grp .tag { position: absolute; left: 0; right: 0; bottom: 0; text-align: center; font-size: .68rem; letter-spacing: .06em; text-transform: uppercase; color: #9fb8ad; }
.tray .win .t { outline: 2px solid var(--gold); outline-offset: 1px; border-radius: 6px; }
.tray .win .tag { color: var(--gold); }
.tbtn { appearance: none; border: 0; padding: 0; background: none; cursor: pointer; border-radius: 6px; transition: transform .15s ease, filter .15s; }
.tbtn:hover:not(:disabled) { transform: translateY(-3px); }
.tbtn:active:not(:disabled) { transform: translateY(0) scale(.96); }
.tbtn:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
.tbtn:disabled { opacity: .28; cursor: not-allowed; }
.tray .tbtn:hover .t { filter: drop-shadow(0 0 0 transparent) brightness(.92); }
.count { margin-left: auto; font: 600 .85rem var(--sans); color: #cfe0d8; }
.count.done { color: var(--gold); }

.modes { display: flex; flex-wrap: wrap; gap: .35rem; margin: .9rem 0 .7rem; }
.seg { display: inline-flex; background: rgba(0,0,0,.22); border-radius: 999px; padding: 3px; flex-wrap: wrap; }
.seg button { appearance: none; border: 0; background: none; color: #cfe0d8; font: 500 .88rem var(--sans); padding: .38rem .8rem; border-radius: 999px; cursor: pointer; transition: background .2s, color .2s; }
.seg button:hover { color: #fff; }
.seg button[aria-pressed="true"] { background: var(--ivory); color: var(--felt-3); }
.hint { font-size: .85rem; color: #9fb8ad; margin: .2rem 0 .6rem; min-height: 1.3em; }
.palette { display: grid; gap: .45rem; }
.palette .prow { display: flex; flex-wrap: wrap; gap: 3px; }
.palette .t { width: 38px; height: 51px; }
@media (max-width: 520px) { .palette .t { width: 33px; height: 44px; } }

.opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: .9rem 1.2rem; }
.opt > span { display: block; font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: #9fb8ad; margin-bottom: .35rem; }
.checks { display: flex; flex-wrap: wrap; gap: .35rem .9rem; }
.checks label { display: inline-flex; align-items: center; gap: .4rem; font-size: .92rem; color: #dfe9e4; cursor: pointer; }
.checks input { accent-color: var(--gold); width: 1rem; height: 1rem; }
.flowers { display: flex; flex-wrap: wrap; gap: 3px; }
.flowers .tbtn { opacity: .38; }
.flowers .tbtn[aria-pressed="true"] { opacity: 1; transform: translateY(-3px); }
select { font: 500 .9rem var(--sans); color: var(--ink); background: var(--ivory); border: 0; border-radius: 8px; padding: .4rem .6rem; }

.side { position: sticky; top: 1rem; }
.side .actions { margin-top: .9rem; }
.side .actions a { color: #dfe9e4; }
.result { background: var(--paper); color: var(--text); border-radius: var(--r); padding: 1.3rem 1.3rem 1.1rem; box-shadow: 0 12px 40px rgba(0,0,0,.28); }
.result .big { display: flex; align-items: baseline; gap: .5rem; }
.result .num { font: 400 4.2rem/1 var(--serif); color: var(--red); transition: transform .25s; }
.result .num.pop { animation: pop .35s ease; }
@keyframes pop { 40% { transform: scale(1.12); } }
.result .unit { font: 600 1.05rem var(--sans); color: var(--ink); }
.result .unit .zh { color: var(--muted); font-weight: 500; }
.result .status { font-size: .95rem; margin: .4rem 0 .8rem; color: var(--muted); }
.result .status.bad { color: var(--red-2); }
.result .status.good { color: var(--jade); }
.lines { list-style: none; padding: 0; margin: 0 0 .8rem; border-top: 1px solid var(--line); }
.lines li { display: grid; grid-template-columns: 4.2rem 1fr auto; gap: .6rem; padding: .45rem 0; border-bottom: 1px solid var(--line); font-size: .95rem; align-items: baseline; }
.lines .zh { color: var(--ink); font-weight: 600; }
.lines .f { font-weight: 700; color: var(--ink); font-variant-numeric: tabular-nums; }
.lines .sub { grid-column: 2 / 4; font-size: .8rem; color: var(--muted); margin-top: -.3rem; }
.lines li.total { font-weight: 700; border-bottom: 0; }
.lines .g { display: block; grid-template-columns: none; font-size: .72rem; text-transform: uppercase; letter-spacing: .09em; color: var(--muted); padding-top: .7rem; border-bottom: 0; }
.settle { background: var(--ivory); border-radius: 10px; padding: .7rem .9rem; font-size: .95rem; margin-bottom: .8rem; }
.settle strong { color: var(--ink); }
.actions { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; font-size: .9rem; }
.btn { appearance: none; border: 0; cursor: pointer; font: 600 .9rem var(--sans); padding: .55rem 1rem; border-radius: 999px; background: var(--red); color: #fff; text-decoration: none; transition: background .2s, transform .15s; display: inline-block; }
.btn:hover { background: var(--red-2); color: #fff; transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1.5px var(--line); }
.btn.ghost:hover { background: var(--ivory); color: var(--ink); }
.btn.light { background: var(--ivory); color: var(--felt-3); }
.btn.light:hover { background: #fff; color: var(--felt-3); }
.examples { display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; margin-top: 1rem; font-size: .9rem; color: #9fb8ad; }
.examples button { appearance: none; border: 1px solid rgba(255,255,255,.18); background: none; color: #dfe9e4; font: 500 .85rem var(--sans); padding: .3rem .75rem; border-radius: 999px; cursor: pointer; transition: border-color .2s, background .2s; }
.examples button:hover { border-color: var(--gold); background: rgba(201,146,43,.12); }

/* ---- content ---- */
.prose { padding: 2rem 0 3.5rem; }
.prose h2:first-child { margin-top: .5em; }
.scroll { overflow-x: auto; }
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: .4rem 1.6rem; }
.cols h3 { margin-top: .6em; }
.toc { display: flex; flex-wrap: wrap; gap: .4rem; margin: 0 0 1rem; }
.toc a { font-size: .9rem; padding: .3rem .8rem; border-radius: 999px; background: var(--ivory); color: var(--ink); text-decoration: none; }
.toc a:hover { background: var(--line); }
.ftable a { text-decoration: none; }
.hand .meld { padding-bottom: 5px; border-bottom: 3px solid var(--jade); }
.hand .win .t { outline: 2px solid var(--gold); outline-offset: 1px; border-radius: 6px; }
.hand .bonus { margin-left: .6rem; }
.handnote { font-size: .9rem; color: var(--muted); margin: -.3rem 0 .6rem; }
.pattern-head .jp { color: #b9cdc4; font-style: italic; }
.pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2.4rem; padding-top: 1rem; border-top: 1px solid var(--line); }
details.rules { margin-top: 1rem; border-top: 1px solid rgba(255,255,255,.1); padding-top: .8rem; }
details.rules summary { cursor: pointer; color: #dfe9e4; font-weight: 600; margin-bottom: .7rem; }
.opt select { width: 100%; }
.prose li { margin-bottom: .35em; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; margin: 1.4rem 0 2rem; }
.card { display: block; background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 1.1rem 1.2rem; text-decoration: none; color: var(--text); box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s, border-color .2s; }
a.card:hover { transform: translateY(-3px); border-color: #d2c6ab; box-shadow: 0 2px 4px rgba(15,47,39,.08), 0 14px 30px rgba(15,47,39,.12); color: var(--text); }
.card h3 { margin: 0 0 .3rem; font-size: 1.2rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card .hand { margin: .1rem 0 .7rem; }
.ftable { width: 100%; border-collapse: collapse; margin: .6rem 0 1.6rem; font-size: .97rem; }
.ftable th, .ftable td { text-align: left; padding: .6rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.ftable th { font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 600; }
.ftable td.n, .ftable th.n { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.ftable .zh { font-weight: 600; color: var(--ink); white-space: nowrap; }
.ftable .jp { display: block; font-size: .8rem; color: var(--muted); font-style: italic; white-space: nowrap; }
.ftable tr:hover td { background: rgba(246,240,225,.6); }
.pill { display: inline-block; font: 700 .78rem var(--sans); padding: .1rem .55rem; border-radius: 999px; background: var(--ivory); color: var(--ink); white-space: nowrap; }
.pill.limit { background: var(--red); color: #fff; }
.pattern-head { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.pattern-head .bigzh { font: 600 2.6rem/1 var(--cjk); color: var(--ivory); }
.box { background: var(--ivory); border-radius: var(--r); padding: 1rem 1.2rem; margin: 1.4rem 0; }
.box.note { border-left: 4px solid var(--gold); }
.box p:last-child { margin-bottom: 0; }
.qa { background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 1.1rem 1.2rem; margin: 1.2rem 0; box-shadow: var(--shadow); }
.qa h2, .qa h3 { margin-top: 0; }
.qa details { margin-top: .6rem; }
.qa summary { cursor: pointer; font-weight: 600; color: var(--red-2); }
.qa .lines { margin-top: .6rem; }
dl.gloss { display: grid; grid-template-columns: minmax(9rem, auto) 1fr; gap: .2rem 1.4rem; }
dl.gloss dt { font: 600 1.15rem var(--cjk); color: var(--ink); padding-top: .7rem; border-top: 1px solid var(--line); }
dl.gloss dt .jp { display: block; font: italic 400 .82rem var(--sans); color: var(--muted); }
dl.gloss dd { margin: 0; padding-top: .7rem; border-top: 1px solid var(--line); }
@media (max-width: 560px) { dl.gloss { grid-template-columns: 1fr; } dl.gloss dd { border-top: 0; padding-top: 0; margin-bottom: .4rem; } }

form.fb { display: grid; gap: .9rem; max-width: 34rem; }
form.fb label { font-weight: 600; font-size: .95rem; color: var(--ink); display: grid; gap: .35rem; }
form.fb input, form.fb textarea, form.fb select { font: 400 1rem var(--sans); padding: .6rem .7rem; border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--text); width: 100%; }
form.fb textarea { min-height: 7rem; resize: vertical; }
form.fb .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.formmsg { min-height: 1.4em; font-weight: 600; }
.formmsg.ok { color: var(--jade); }
.formmsg.err { color: var(--red-2); }

/* ---- footer ---- */
.foot { background: var(--felt-3); color: #a9bfb5; font-size: .9rem; padding: 2rem 0 2.4rem; margin-top: 2rem; }
.foot .wrap { display: grid; gap: 1rem; grid-template-columns: 2fr 1fr; }
@media (max-width: 720px) { .foot .wrap { grid-template-columns: 1fr; } }
.foot a { color: #dfe9e4; }
.foot .caveat { max-width: 38em; }
.foot ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: .3rem 1rem; }

.fade-in { animation: rise .5s ease both; }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }