/* ==========================================================================
   آزمایشگاه تخته‌نرد — سیستم طراحی
   حال‌وهوا: تحلیلی و فنی. گرافیت تیره، فیروزه‌ای سرد، جدول‌های داده و دیاگرام.
   ========================================================================== */

@font-face { font-family: "Sahel"; src: url("/assets/fonts/Sahel.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Sahel"; src: url("/assets/fonts/Sahel-SemiBold.woff2") format("woff2"); font-weight: 600; font-display: swap; }
@font-face { font-family: "Sahel"; src: url("/assets/fonts/Sahel-Bold.woff2") format("woff2"); font-weight: 700; font-display: swap; }

:root {
  --bg-0: #0d1214;
  --bg-1: #121a1d;
  --bg-2: #172226;
  --line: #23343a;
  --line-2: #1b282c;

  --fg: #e8f1ef;
  --fg-2: #b3c6c3;
  --fg-3: #7f9895;

  --teal: #4fd1bd;
  --teal-2: #2aa294;
  --teal-dim: rgba(79, 209, 189, 0.14);
  --amber: #e0a63c;
  --violet: #9a8cf5;
  --red: #e2705f;
  --green: #58c98e;

  --mono: "SFMono-Regular", "Menlo", "Consolas", monospace;
  --maxw: 1120px;
  --r: 4px;
  --r-lg: 8px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background:
    linear-gradient(180deg, #101719 0%, var(--bg-0) 100%) fixed,
    var(--bg-0);
  color: var(--fg);
  font-family: "Sahel", "Tahoma", system-ui, sans-serif;
  line-height: 1.95;
  font-size: 0.98rem;
}
h1, h2, h3, h4 { line-height: 1.5; margin: 0 0 0.5em; font-weight: 700; color: #fff; letter-spacing: -0.005em; }
h1 { font-size: clamp(1.55rem, 4.2vw, 2rem); }
h2 { font-size: clamp(1.2rem, 3vw, 1.42rem); }
h3 { font-size: 1.05rem; color: var(--teal); }
p { margin: 0 0 1em; color: var(--fg-2); }
ul, ol { color: var(--fg-2); padding-inline-start: 1.3em; margin: 0 0 1em; }
li { margin-bottom: 0.4em; }
a { color: var(--teal); text-decoration: none; }
a:hover { color: #fff; text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
strong { color: var(--fg); }
:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }
table { border-collapse: collapse; width: 100%; }
code, kbd { font-family: var(--mono); font-size: 0.86em; background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--r); padding: 0.05em 0.4em; color: var(--teal); }

.w { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 1rem; }
.s { padding-block: 2.3rem; }
.s-sm { padding-block: 1.2rem; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.dim { color: var(--fg-3); }
.sm { font-size: 0.85rem; }
.mono { font-family: var(--mono); }
.stack > * + * { margin-top: 0.85rem; }
.skip { position: absolute; inset-inline-start: 1rem; top: -60px; background: var(--teal); color: #06201d; padding: 0.5em 1em; border-radius: var(--r); z-index: 100; }
.skip:focus { top: 0.5rem; }

/* ------------------------------------------------------------------ header */
.hd { border-bottom: 1px solid var(--line); background: rgba(13, 18, 20, 0.92); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 50; }
.hd-in { display: flex; align-items: center; gap: 0.7rem; min-height: 58px; }
.mark { display: flex; align-items: center; gap: 0.5rem; color: #fff; font-weight: 700; font-size: 0.98rem; }
.mark img { width: 30px; height: 30px; }
.mark i { font-style: normal; color: var(--teal); font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.08em; }
.nv { display: none; margin-inline-start: auto; gap: 0.05rem; }
.nv a { color: var(--fg-2); font-size: 0.85rem; padding: 0.4em 0.6em; border-radius: var(--r); }
.nv a:hover { background: var(--bg-2); color: #fff; text-decoration: none; }
.nv a[aria-current="page"] { color: var(--teal); background: var(--teal-dim); }
.hd .go { display: none; }
@media (min-width: 1040px) { .nv { display: flex; } .hd .go { display: inline-flex; } .mb { display: none; } }
.mb { margin-inline-start: auto; width: 42px; height: 42px; border: 1px solid var(--line); background: var(--bg-2); color: var(--teal); border-radius: var(--r); font-size: 1.1rem; cursor: pointer; }
.dr { display: none; flex-direction: column; padding: 0.4rem 1rem 0.9rem; border-top: 1px solid var(--line); }
.dr.open { display: flex; }
.dr a { color: var(--fg-2); padding: 0.55em 0.2em; font-size: 0.92rem; }

/* ----------------------------------------------------------------- buttons */
.b {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4em;
  min-height: 44px; padding: 0.5em 1.1em; border-radius: var(--r);
  font-family: inherit; font-size: 0.92rem; font-weight: 700; cursor: pointer;
  border: 1px solid var(--line); background: var(--bg-2); color: var(--fg);
  transition: border-color 0.15s var(--ease), background 0.15s var(--ease);
}
.b:hover { border-color: var(--teal); color: #fff; text-decoration: none; }
.b-main { background: var(--teal); border-color: var(--teal); color: #06201d; }
.b-main:hover { background: #63e0cb; color: #06201d; }
.b-sm { min-height: 34px; font-size: 0.8rem; padding: 0.25em 0.7em; }
.b-lg { min-height: 50px; font-size: 1rem; padding-inline: 1.5rem; }
.bs { display: flex; flex-wrap: wrap; gap: 0.5rem; }

/* ------------------------------------------------------------------- cards */
.p { background: var(--bg-1); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 1rem; }
.p-t { border-color: rgba(79, 209, 189, 0.35); background: linear-gradient(180deg, rgba(79,209,189,0.06), transparent); }
.gr { display: grid; gap: 0.8rem; }
@media (min-width: 640px) { .g2 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .g3 { grid-template-columns: repeat(3, 1fr); } .g4 { grid-template-columns: repeat(4, 1fr); } }

.tag { display: inline-flex; align-items: center; gap: 0.3em; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.04em; padding: 0.15em 0.6em; border-radius: var(--r); border: 1px solid var(--line); color: var(--fg-3); }
.tag-t { color: var(--teal); border-color: rgba(79,209,189,0.4); background: var(--teal-dim); }
.tag-a { color: var(--amber); border-color: rgba(224,166,60,0.4); }
.tag-v { color: var(--violet); border-color: rgba(154,140,245,0.4); }

/* --------------------------------------------------------------------- hero */
.hero { border-bottom: 1px solid var(--line); background:
  radial-gradient(700px 320px at 88% -10%, rgba(79,209,189,0.1), transparent 70%); }
.hero-in { padding-block: 2rem 1.6rem; display: grid; gap: 1.5rem; }
@media (min-width: 940px) { .hero-in { grid-template-columns: 1.1fr 0.9fr; align-items: center; padding-block: 3rem 2.2rem; } }
.hero h1 { margin-bottom: 0.4rem; }
.hero .lead { font-size: 1.05rem; color: var(--fg-2); }
.kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.6rem; margin-top: 1.2rem; }
.kpi { border: 1px solid var(--line); border-radius: var(--r-lg); padding: 0.6rem 0.7rem; background: var(--bg-1); }
.kpi b { display: block; font-family: var(--mono); font-size: 1.3rem; color: var(--teal); line-height: 1.4; }
.kpi span { font-size: 0.74rem; color: var(--fg-3); }

/* --------------------------------------------------------------- data table */
.tw { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--bg-1); }
table.d { min-width: 640px; font-size: 0.86rem; }
table.d th, table.d td { padding: 0.55rem 0.7rem; text-align: start; border-bottom: 1px solid var(--line-2); }
table.d thead th { background: var(--bg-2); color: var(--fg-3); font-size: 0.75rem; font-family: var(--mono); font-weight: 400; letter-spacing: 0.04em; white-space: nowrap; }
table.d tbody tr:last-child td { border-bottom: 0; }
table.d td.n, table.d th.n { font-family: var(--mono); }
table.d tbody tr:hover { background: rgba(79,209,189,0.04); }
.barcell { display: block; height: 5px; background: var(--teal); border-radius: 2px; min-width: 2px; }

/* ------------------------------------------------------------------- tools */
.tool { border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--bg-1); overflow: hidden; }
.tool-hd { display: flex; align-items: center; gap: 0.5rem; padding: 0.7rem 0.9rem; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.tool-hd h3 { margin: 0; font-size: 0.95rem; color: #fff; }
.tool-bd { padding: 0.9rem; }
.chips { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.chip {
  font-family: inherit; font-size: 0.83rem; padding: 0.3em 0.75em; border-radius: var(--r);
  border: 1px solid var(--line); background: var(--bg-2); color: var(--fg-2); cursor: pointer; min-height: 36px;
}
.chip:hover { border-color: var(--teal); color: #fff; }
.chip[aria-pressed="true"], .chip.on { background: var(--teal-dim); border-color: var(--teal); color: var(--teal); font-weight: 700; }

/* ماتریس ۳۶ حالت تاس */
.matrix { display: grid; grid-template-columns: auto repeat(6, 1fr); gap: 2px; font-family: var(--mono); font-size: 0.72rem; max-width: 420px; }
.matrix span { display: grid; place-items: center; aspect-ratio: 1; border-radius: 2px; background: var(--bg-2); color: var(--fg-3); border: 1px solid var(--line-2); }
.matrix span.hd { background: transparent; border: 0; color: var(--fg-3); }
.matrix span.hit { background: var(--teal-dim); border-color: var(--teal); color: var(--teal); font-weight: 700; }
.matrix span.dbl { outline: 1px dashed rgba(154,140,245,0.6); }
.readout { display: flex; flex-wrap: wrap; gap: 1rem; align-items: baseline; margin-top: 0.8rem; }
.readout b { font-family: var(--mono); font-size: 1.5rem; color: var(--teal); }
.readout span { font-size: 0.82rem; color: var(--fg-3); }

/* تخته‌ی کوچک تحلیلی */
.mini { display: grid; grid-template-columns: repeat(6, 1fr); gap: 3px; max-width: 380px; }
.mini .pt {
  border: 1px solid var(--line); border-radius: var(--r); background: var(--bg-2);
  min-height: 74px; padding: 4px; display: flex; flex-direction: column; align-items: center; gap: 2px; position: relative;
}
.mini .pt .lbl { font-family: var(--mono); font-size: 0.66rem; color: var(--fg-3); }
.mini .pt .ck { width: 60%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle at 34% 30%, #f2f7f6, #b9cdc9 76%); }
.mini .pt .ck.op { background: radial-gradient(circle at 34% 30%, #4a6570, #22333a 76%); }
.mini .pt.can { border-color: var(--teal); box-shadow: 0 0 0 1px var(--teal) inset; }
.mini .pt .more { font-family: var(--mono); font-size: 0.7rem; color: var(--fg-2); }
.legend { display: flex; flex-wrap: wrap; gap: 0.8rem; font-size: 0.78rem; color: var(--fg-3); margin-top: 0.6rem; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-inline-end: 0.3em; vertical-align: middle; }

.seqlist { font-family: var(--mono); font-size: 0.8rem; color: var(--fg-2); display: grid; gap: 0.25rem; max-height: 240px; overflow-y: auto; }
.seqlist div { padding: 0.25rem 0.5rem; background: var(--bg-2); border: 1px solid var(--line-2); border-radius: var(--r); }

/* ------------------------------------------------------------ brand blocks */
.bcard { border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--bg-1); padding: 0.9rem; display: grid; gap: 0.7rem; }
.bhead { display: flex; align-items: center; gap: 0.6rem; }
.bhead .lg { width: 58px; height: 40px; background: #fff; border-radius: var(--r); display: grid; place-items: center; padding: 3px; flex: 0 0 auto; }
.bhead .lg img { max-height: 32px; width: auto; }
.bhead .nm { font-weight: 700; font-size: 0.95rem; }
.bhead .nm small { display: block; color: var(--fg-3); font-weight: 400; font-size: 0.72rem; font-family: var(--mono); }
.bhead .sc { margin-inline-start: auto; font-family: var(--mono); font-size: 1.3rem; color: var(--teal); }
.spark { display: grid; grid-template-columns: repeat(6, 1fr); gap: 3px; align-items: end; height: 46px; }
.spark i { display: block; background: linear-gradient(180deg, var(--teal), var(--teal-2)); border-radius: 2px 2px 0 0; min-height: 2px; }
.spark i.empty { background: repeating-linear-gradient(45deg, var(--line), var(--line) 2px, transparent 2px, transparent 4px); }
.spark-lbl { display: grid; grid-template-columns: repeat(6, 1fr); gap: 3px; font-size: 0.62rem; color: var(--fg-3); text-align: center; margin-top: 0.2rem; }

/* --------------------------------------------------------------------- faq */
.faq details { border: 1px solid var(--line); border-radius: var(--r); background: var(--bg-1); padding: 0.7rem 0.9rem; margin-bottom: 0.5rem; }
.faq summary { cursor: pointer; font-weight: 700; color: #fff; list-style: none; font-size: 0.93rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "›"; float: inline-start; margin-inline-end: 0.5rem; color: var(--teal); }
.faq details[open] summary::after { content: "⌄"; }
.faq p { margin: 0.5rem 0 0; font-size: 0.9rem; }

/* ---------------------------------------------------------------- comments */
.cm { border: 1px solid var(--line); border-radius: var(--r); background: var(--bg-1); padding: 0.75rem 0.9rem; }
.cm-h { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; margin-bottom: 0.25rem; }
.cm-h b { font-size: 0.9rem; }
.cm-h time { margin-inline-start: auto; font-family: var(--mono); font-size: 0.72rem; color: var(--fg-3); }
.cm p { margin: 0; font-size: 0.88rem; }
.cm.pending { border-style: dashed; border-color: var(--amber); }
.stars { color: var(--amber); font-size: 0.85rem; letter-spacing: 0.05em; }
.stars .off { color: var(--line); }

label { display: block; font-size: 0.83rem; color: var(--fg-2); margin-bottom: 0.25rem; font-weight: 600; }
input, select, textarea {
  width: 100%; font-family: inherit; font-size: 0.92rem; color: var(--fg); background: var(--bg-2);
  border: 1px solid var(--line); border-radius: var(--r); padding: 0.5rem 0.65rem; min-height: 42px;
}
textarea { min-height: 104px; resize: vertical; }
.fg { display: grid; gap: 0.65rem; }
@media (min-width: 620px) { .fg .two { display: grid; grid-template-columns: 1fr 1fr; gap: 0.65rem; } }
.fn { font-size: 0.78rem; color: var(--fg-3); }
.fok { font-size: 0.84rem; color: var(--green); font-weight: 700; }

/* -------------------------------------------------------------- breadcrumb */
.bc { font-family: var(--mono); font-size: 0.75rem; color: var(--fg-3); padding-block: 0.7rem 0; }
.bc ol { display: flex; flex-wrap: wrap; gap: 0.3em; list-style: none; padding: 0; margin: 0; }
.bc li::after { content: "›"; margin-inline-start: 0.3em; color: var(--line); }
.bc li:last-child::after { content: ""; }
.bc a { color: var(--fg-2); }

/* ------------------------------------------------------------------- prose */
.prose { max-width: 70ch; }
.prose h2 { margin-top: 1.9rem; padding-top: 0.5rem; border-top: 1px solid var(--line-2); }
.prose h3 { margin-top: 1.3rem; }
.box { border-inline-start: 2px solid var(--teal); background: rgba(79,209,189,0.05); padding: 0.75rem 0.95rem; margin: 1.1rem 0; border-radius: 0 var(--r) var(--r) 0; }
.box.warn { border-color: var(--amber); background: rgba(224,166,60,0.06); }
.box p:last-child { margin-bottom: 0; }
.formula { font-family: var(--mono); background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--r); padding: 0.6rem 0.8rem; color: var(--teal); font-size: 0.85rem; overflow-x: auto; }

/* --------------------------------------------------------------- game page */
#game-root { min-height: 460px; }
#game-root.game-loading { display: grid; place-items: center; border: 1px dashed var(--line); border-radius: var(--r-lg); color: var(--fg-3); }

/* ------------------------------------------------------------------ footer */
.ft { border-top: 1px solid var(--line); margin-top: 2.5rem; padding-block: 1.9rem 1.1rem; background: var(--bg-1); }
.ft-g { display: grid; gap: 1.2rem; }
@media (min-width: 760px) { .ft-g { grid-template-columns: 1.4fr 1fr 1fr 1fr; } }
.ft h4 { font-family: var(--mono); font-size: 0.75rem; color: var(--fg-3); letter-spacing: 0.06em; margin-bottom: 0.55rem; }
.ft a { display: block; font-size: 0.85rem; color: var(--fg-2); padding: 0.12em 0; }
.ft-b { margin-top: 1.5rem; padding-top: 0.9rem; border-top: 1px solid var(--line-2); font-size: 0.76rem; color: var(--fg-3); }

@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }