/* ==========================================================================
   بخش آمار — دانشکدهٔ علوم دانشگاه شیراز
   طرح مدرن، راست‌به‌چپ، روشن/تیره
   پالت: slate + emerald (هماهنگ با مرجع)
   ========================================================================== */

/* ---------- توکن‌های طراحی ----------
   پیش‌فرض روشن است؛ پوستهٔ تیره با [data-theme="dark"]. */
:root {
  color-scheme: light;

  --bg: #f8fafc;
  --bg-soft: #ffffff;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;

  --fg: #0f172a;
  --fg-muted: #475569;
  --fg-dim: #94a3b8;

  --brand: #059669;
  --brand-2: #10b981;
  --brand-3: #34d399;
  --accent: #0d9488;
  --warn: #d97706;
  --danger: #dc2626;

  --grad: linear-gradient(135deg, #047857 0%, #059669 55%, #10b981 100%);
  --grad-soft: linear-gradient(135deg, rgba(16,185,129,.10), rgba(52,211,153,.06));

  --r-sm: 10px;
  --r: 16px;
  --r-lg: 24px;
  --r-full: 999px;

  --shadow: 0 12px 34px -14px rgba(15, 23, 42, .18);
  --shadow-lg: 0 26px 60px -22px rgba(15, 23, 42, .24);
  --ring: 0 0 0 3px rgba(16, 185, 129, .28);

  --nav-h: 68px;
  --wrap: 1180px;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0b1220;
  --bg-soft: #111a2e;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.075);
  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.18);

  --fg: #e8eefb;
  --fg-muted: #9fb0c9;
  --fg-dim: #64748b;

  --brand: #34d399;
  --brand-2: #10b981;
  --brand-3: #6ee7b7;
  --accent: #2dd4bf;
  --warn: #fbbf24;
  --danger: #f87171;

  --grad: linear-gradient(135deg, #047857 0%, #059669 55%, #34d399 100%);
  --grad-soft: linear-gradient(135deg, rgba(52,211,153,.14), rgba(16,185,129,.08));

  --shadow: 0 12px 40px -12px rgba(0, 0, 0, .6);
  --shadow-lg: 0 28px 70px -20px rgba(0, 0, 0, .7);
  --ring: 0 0 0 3px rgba(52, 211, 153, .3);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Vazirmatn, "Segoe UI", Tahoma, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.85;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* هاله‌های پس‌زمینه */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60rem 34rem at 88% -6%, rgba(59, 130, 246, .17), transparent 62%),
    radial-gradient(46rem 30rem at 4% 8%, rgba(139, 92, 246, .14), transparent 60%),
    radial-gradient(40rem 26rem at 50% 105%, rgba(34, 211, 238, .10), transparent 60%);
  pointer-events: none;
}

/* توری ظریف */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 72%);
  opacity: .5;
  pointer-events: none;
}

img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection { background: rgba(59, 130, 246, .35); }

/* نوار پیمایش */
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--r-full);
  border: 3px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover { background: var(--fg-dim); }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

.skip-link {
  position: absolute;
  inset-inline-start: -9999px;
  top: 0;
  z-index: 200;
  padding: 12px 20px;
  background: var(--brand);
  color: #fff;
  border-radius: 0 0 var(--r-sm) 0;
}
.skip-link:focus { inset-inline-start: 0; }

/* ---------- هدر ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: color-mix(in oklab, var(--bg) 78%, transparent);
  backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  width: 100%;
}

.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }

.brand__mark {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  border-radius: 13px;
  background: var(--grad);
  display: grid;
  place-items: center;
  box-shadow: 0 8px 22px -8px rgba(59, 130, 246, .7);
}
.brand__mark svg { width: 24px; height: 24px; stroke: #fff; }

.brand__text { min-width: 0; }
.brand__title {
  font-size: 15px;
  font-weight: 800;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand__sub {
  font-size: 11.5px;
  color: var(--fg-dim);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav__links { display: flex; gap: 4px; margin-inline-start: auto; }

.nav__links a {
  padding: 9px 15px;
  border-radius: var(--r-full);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--fg-muted);
  transition: color .2s, background .2s;
}
.nav__links a:hover { color: var(--fg); background: var(--surface-2); }

.nav__actions { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  transition: background .2s, border-color .2s, transform .2s;
}
.icon-btn:hover { background: var(--surface-2); border-color: var(--border-strong); }
.icon-btn:active { transform: scale(.94); }
.icon-btn svg { width: 19px; height: 19px; stroke: currentColor; }

/* در پوستهٔ روشن (پیش‌فرض) خورشید دیده می‌شود (برای رفتن به تیره)؛
   در پوستهٔ تیره ماه. */
.theme-toggle .sun { display: block; }
.theme-toggle .moon { display: none; }
[data-theme="dark"] .theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .moon { display: block; }

.nav__burger { display: none; }

/* ---------- دکمه‌ها ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: var(--r-full);
  font-size: 15px;
  font-weight: 700;
  transition: transform .2s var(--ease), box-shadow .25s, background .2s, border-color .2s;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; stroke: currentColor; flex: 0 0 auto; }
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 12px 32px -12px rgba(59, 130, 246, .75);
}
.btn--primary:hover { box-shadow: 0 18px 42px -12px rgba(59, 130, 246, .9); }

.btn--ghost {
  background: var(--surface);
  border-color: var(--border);
  color: var(--fg);
}
.btn--ghost:hover { background: var(--surface-2); border-color: var(--border-strong); }

.btn--sm { padding: 9px 18px; font-size: 13.5px; }
.btn--block { width: 100%; }

/* ---------- بخش‌ها ---------- */
.section { padding-block: clamp(56px, 9vw, 104px); }
.section--alt {
  background: var(--bg-soft);
  border-block: 1px solid var(--border);
}

.section__head { max-width: 660px; margin-bottom: 44px; }
.section__head--center { margin-inline: auto; text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 15px;
  margin-bottom: 18px;
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  background: var(--grad-soft);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .3px;
  color: var(--brand-2);
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 12px currentColor;
}

h1, h2, h3, h4 { margin: 0; line-height: 1.35; font-weight: 800; letter-spacing: -.2px; }
h2 { font-size: clamp(26px, 3.6vw, 40px); }
h3 { font-size: clamp(19px, 2.2vw, 24px); }

.lead {
  margin: 14px 0 0;
  font-size: clamp(15.5px, 1.6vw, 18px);
  color: var(--fg-muted);
  line-height: 1.95;
}

/* ---------- هیرو ---------- */
.hero {
  position: relative;
  padding-block: clamp(52px, 9vw, 108px) clamp(48px, 8vw, 88px);
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(32px, 5vw, 68px);
  align-items: center;
}

.hero h1 {
  font-size: clamp(31px, 5.6vw, 60px);
  line-height: 1.22;
  letter-spacing: -1px;
}
.hero h1 .grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 32px; }

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 42px;
  padding-top: 30px;
  border-top: 1px solid var(--border);
}
.hero__stat b {
  display: block;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__stat span { font-size: 12.5px; color: var(--fg-dim); }

/* کارت شناور نمایش درخت */
.hero__visual { position: relative; }

.float-card {
  position: relative;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--bg-soft);
  box-shadow: var(--shadow-lg);
  animation: float 7s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-11px); }
}
@media (prefers-reduced-motion: reduce) {
  .float-card { animation: none; }
}

.float-card__glow {
  position: absolute;
  inset: -2px;
  z-index: -1;
  border-radius: var(--r-lg);
  background: var(--grad);
  opacity: .28;
  filter: blur(26px);
}

.mini-tree { font-size: 13.5px; line-height: 2.15; }
.mini-tree__row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 12px;
  border-radius: var(--r-sm);
  transition: background .2s;
}
.mini-tree__row:hover { background: var(--surface); }
.mini-tree__row[data-depth="1"] { margin-inline-start: 18px; }
.mini-tree__row[data-depth="2"] { margin-inline-start: 36px; }
.mini-tree__row[data-depth="3"] { margin-inline-start: 54px; }

.mini-tree__dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand);
}
.mini-tree__row[data-depth="1"] .mini-tree__dot { background: var(--brand-3); }
.mini-tree__row[data-depth="2"] .mini-tree__dot { background: var(--brand-2); }
.mini-tree__row[data-depth="3"] .mini-tree__dot { background: var(--accent); }

.mini-tree__tag {
  margin-inline-start: auto;
  padding: 3px 10px;
  border-radius: var(--r-full);
  background: var(--surface-2);
  font-size: 11px;
  font-weight: 700;
  color: var(--fg-muted);
  white-space: nowrap;
}

/* ---------- کارت‌ها ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(268px, 1fr));
  gap: 20px;
}

.card {
  position: relative;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  transition: transform .3s var(--ease), border-color .3s, box-shadow .3s;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline: 0;
  height: 2px;
  background: var(--grad);
  opacity: 0;
  transition: opacity .3s;
}
.card:hover {
  transform: translateY(-5px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}
.card:hover::before { opacity: 1; }

.card__icon {
  width: 46px;
  height: 46px;
  margin-bottom: 18px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  background: var(--grad-soft);
  border: 1px solid var(--border);
}
.card__icon svg { width: 22px; height: 22px; stroke: var(--brand-2); }

.card h3 { font-size: 17.5px; margin-bottom: 9px; }
.card p { margin: 0; font-size: 14.5px; color: var(--fg-muted); line-height: 1.9; }

/* ---------- ویزارد ---------- */
.wizard {
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--bg-soft);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.wizard__bar {
  height: 4px;
  background: var(--surface-2);
  overflow: hidden;
}
.wizard__fill {
  height: 100%;
  width: 0;
  background: var(--grad);
  border-radius: 0 var(--r-full) var(--r-full) 0;
  transition: width .45s var(--ease);
}

.wizard__body { padding: clamp(24px, 4vw, 42px); }

.wizard__crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
}
.wizard__crumbs:empty { display: none; }

.crumb {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 13px;
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  background: var(--surface);
  font-size: 12.5px;
  color: var(--fg-muted);
  transition: border-color .2s, color .2s;
}
.crumb:hover { border-color: var(--brand); color: var(--fg); }
.crumb b {
  width: 19px;
  height: 19px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--grad);
  color: #fff;
  font-size: 10.5px;
  font-weight: 800;
}

.wizard__step {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--brand-2);
  letter-spacing: .4px;
  margin-bottom: 10px;
}

.wizard__q {
  font-size: clamp(20px, 2.6vw, 27px);
  font-weight: 800;
  line-height: 1.5;
  margin-bottom: 12px;
}

.wizard__help {
  padding: 15px 18px;
  margin-bottom: 26px;
  border-inline-start: 3px solid var(--brand);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--grad-soft);
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.9;
}

.opts { display: grid; gap: 12px; }

.opt {
  display: flex;
  align-items: center;
  gap: 15px;
  width: 100%;
  padding: 18px 22px;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  text-align: start;
  font-size: 15.5px;
  font-weight: 600;
  transition: transform .2s var(--ease), border-color .2s, background .2s, box-shadow .2s;
}
.opt:hover {
  transform: translateX(-5px);
  border-color: var(--brand);
  background: var(--surface-2);
  box-shadow: var(--shadow);
}
.opt__num {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--grad-soft);
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 800;
  color: var(--brand-2);
}
.opt__arrow { margin-inline-start: auto; color: var(--fg-dim); transition: transform .2s, color .2s; }
.opt:hover .opt__arrow { color: var(--brand); transform: translateX(-4px); }
.opt__arrow svg { width: 18px; height: 18px; stroke: currentColor; }

.wizard__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

/* ---------- نتیجه ---------- */
.result__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 15px;
  border-radius: var(--r-full);
  font-size: 12.5px;
  font-weight: 700;
  white-space: nowrap;
}
.pill--path { background: var(--grad); color: #fff; }
.pill--slide { background: var(--surface-2); color: var(--fg-muted); border: 1px solid var(--border); }
.pill--ref { background: rgba(52, 211, 153, .14); color: var(--accent); border: 1px solid rgba(52, 211, 153, .3); }
.pill--added { background: rgba(139, 92, 246, .16); color: #a78bfa; border: 1px solid rgba(139, 92, 246, .3); }

.result__title { font-size: clamp(20px, 2.6vw, 27px); margin-bottom: 8px; }
.result__dv { color: var(--fg-muted); font-size: 14.5px; margin: 0 0 26px; }

.result__note {
  display: flex;
  gap: 12px;
  padding: 16px 18px;
  margin-bottom: 26px;
  border: 1px solid rgba(139, 92, 246, .3);
  border-radius: var(--r);
  background: rgba(139, 92, 246, .09);
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.9;
}
.result__note svg { flex: 0 0 auto; width: 20px; height: 20px; stroke: #a78bfa; margin-top: 3px; }

.block { margin-bottom: 32px; }
.block__title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16.5px;
  font-weight: 800;
  margin-bottom: 16px;
}
.block__title svg { width: 20px; height: 20px; stroke: var(--brand-2); }
.block__title .count {
  margin-inline-start: auto;
  padding: 3px 11px;
  border-radius: var(--r-full);
  background: var(--surface-2);
  font-size: 12px;
  font-weight: 700;
  color: var(--fg-dim);
}

/* کارت روش */
.method {
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  overflow: hidden;
  margin-bottom: 12px;
  transition: border-color .25s;
}
.method:hover { border-color: var(--border-strong); }
.method--primary { border-inline-start: 3px solid var(--brand); }
.method--extra { border-inline-start: 3px solid var(--brand-3); }

.method__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  padding: 18px 20px;
  background: none;
  border: 0;
  text-align: start;
}
.method__head:hover { background: var(--surface); }

.method__title { flex: 1; min-width: 0; }
.method__name { font-size: 16px; font-weight: 700; }
.method__en { font-size: 12.5px; color: var(--fg-dim); font-family: ui-monospace, monospace; direction: ltr; text-align: start; }
.method__desc { margin: 9px 0 0; font-size: 14px; color: var(--fg-muted); line-height: 1.85; }

.method__chev { flex: 0 0 auto; margin-top: 4px; color: var(--fg-dim); transition: transform .3s var(--ease); }
.method__chev svg { width: 18px; height: 18px; stroke: currentColor; }
.method[aria-expanded="true"] .method__chev { transform: rotate(-180deg); }

.method__body {
  display: none;
  padding: 0 20px 20px;
  border-top: 1px solid var(--border);
  margin-top: -1px;
  padding-top: 20px;
}
.method[aria-expanded="true"] .method__body { display: block; }

/* برگه‌های نرم‌افزار */
.tabs { display: flex; gap: 6px; margin-bottom: 12px; }
.tab {
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  background: var(--surface);
  font-size: 13px;
  font-weight: 700;
  color: var(--fg-muted);
  transition: all .2s;
}
.tab:hover { border-color: var(--border-strong); color: var(--fg); }
.tab[aria-selected="true"] { background: var(--grad); border-color: transparent; color: #fff; }

.code {
  position: relative;
  padding: 15px 17px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: rgba(0, 0, 0, .32);
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 13px;
  line-height: 1.8;
  direction: ltr;
  text-align: start;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
}
[data-theme="light"] .code { background: rgba(15, 23, 42, .05); }

.code__copy {
  position: absolute;
  inset-block-start: 8px;
  inset-inline-end: 8px;
  padding: 5px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--fg-muted);
  opacity: 0;
  transition: opacity .2s, color .2s;
}
.code:hover .code__copy, .code__copy:focus { opacity: 1; }
.code__copy:hover { color: var(--fg); }

/* پیش‌فرض */
.assum {
  padding: 17px 19px;
  border: 1px solid var(--border);
  border-inline-start: 3px solid var(--warn);
  border-radius: var(--r-sm);
  background: var(--surface);
  margin-bottom: 11px;
}
.assum__name { font-size: 15px; font-weight: 700; margin-bottom: 9px; }
.assum__row { display: flex; gap: 9px; font-size: 13.5px; line-height: 1.85; margin-bottom: 5px; }
.assum__row:last-child { margin-bottom: 0; }
.assum__label {
  flex: 0 0 auto;
  padding: 1px 9px;
  border-radius: var(--r-full);
  background: var(--surface-2);
  font-size: 11.5px;
  font-weight: 700;
  height: fit-content;
  margin-top: 3px;
  white-space: nowrap;
}
.assum__row--check .assum__label { color: var(--brand-2); }
.assum__row--fix .assum__label { color: var(--accent); }
.assum__text { color: var(--fg-muted); }

/* مسیر پیموده‌شده */
.trail { display: grid; gap: 10px; }
.trail__item {
  display: flex;
  gap: 14px;
  padding: 14px 17px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--surface);
}
.trail__n {
  flex: 0 0 auto;
  width: 25px;
  height: 25px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--grad);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
}
.trail__q { font-size: 13.5px; color: var(--fg-dim); }
.trail__a { font-size: 14.5px; font-weight: 600; margin-top: 2px; }

/* ---------- درخت کامل ---------- */
.tree-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 22px;
}

.search {
  position: relative;
  flex: 1 1 260px;
  max-width: 420px;
}
.search svg {
  position: absolute;
  inset-inline-start: 15px;
  inset-block-start: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  stroke: var(--fg-dim);
  pointer-events: none;
}
.search input {
  width: 100%;
  padding: 13px 46px 13px 18px;
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  background: var(--surface);
  color: var(--fg);
  font: inherit;
  font-size: 14.5px;
  transition: border-color .2s, box-shadow .2s;
}
.search input::placeholder { color: var(--fg-dim); }
.search input:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: var(--ring);
}

.tree { display: grid; gap: 10px; }

.node {
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  overflow: hidden;
}
.node[hidden] { display: none; }

.node__head {
  display: flex;
  align-items: center;
  gap: 13px;
  width: 100%;
  padding: 17px 20px;
  background: none;
  border: 0;
  text-align: start;
  font-size: 15.5px;
  font-weight: 700;
  transition: background .2s;
}
.node__head:hover { background: var(--surface-2); }

.node__chev { flex: 0 0 auto; color: var(--fg-dim); transition: transform .3s var(--ease); }
.node__chev svg { width: 18px; height: 18px; stroke: currentColor; }
.node[aria-expanded="true"] .node__chev { transform: rotate(-180deg); }

.node__body { display: none; padding: 0 20px 20px; }
.node[aria-expanded="true"] .node__body { display: block; }

.node__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.row-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.row-table th, .row-table td {
  padding: 12px 14px;
  text-align: start;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
  line-height: 1.85;
}
.row-table th {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--fg-dim);
  letter-spacing: .3px;
  white-space: nowrap;
}
.row-table tr:last-child td { border-bottom: 0; }
.row-table td:first-child { font-weight: 600; white-space: nowrap; }
.row-table .m-ref { color: var(--fg); }
.row-table .m-add { color: #a78bfa; }
.table-scroll { overflow-x: auto; margin-inline: -20px; padding-inline: 20px; }

/* ---------- واژه‌نامه و پیش‌فرض‌ها ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; }

.term {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  transition: border-color .25s, transform .25s var(--ease);
}
.term:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.term__name { font-size: 16px; font-weight: 800; margin-bottom: 9px; color: var(--brand-2); }
.term__def { font-size: 14px; color: var(--fg-muted); line-height: 1.9; margin: 0; }

/* ---------- تلگرام ---------- */
.tg {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 5vw, 60px);
  align-items: center;
}

.phone {
  max-width: 330px;
  margin-inline: auto;
  padding: 13px;
  border: 1px solid var(--border-strong);
  border-radius: 38px;
  background: var(--bg-soft);
  box-shadow: var(--shadow-lg);
}
.phone__screen {
  border-radius: 26px;
  background: linear-gradient(160deg, #17212b, #0e1621);
  padding: 16px 13px;
  min-height: 400px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.bubble {
  max-width: 88%;
  padding: 11px 15px;
  border-radius: 17px;
  font-size: 13px;
  line-height: 1.8;
  color: #eaf0fb;
}
.bubble--bot {
  align-self: flex-start;
  background: #1f2c38;
  border-end-start-radius: 5px;
}
.bubble--me {
  align-self: flex-end;
  background: #2b5278;
  border-end-end-radius: 5px;
}
.bubble--opt {
  align-self: stretch;
  max-width: 100%;
  background: rgba(59, 130, 246, .14);
  border: 1px solid rgba(59, 130, 246, .32);
  color: #7cb2f5;
  text-align: center;
  font-weight: 700;
  border-radius: 11px;
  padding: 9px;
}

.steps { display: grid; gap: 16px; margin: 26px 0 0; padding: 0; list-style: none; counter-reset: s; }
.steps li {
  display: flex;
  gap: 15px;
  counter-increment: s;
}
.steps li::before {
  content: counter(s);
  flex: 0 0 auto;
  width: 31px;
  height: 31px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--grad-soft);
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 800;
  color: var(--brand-2);
}
.steps b { display: block; font-size: 15px; }
.steps span { font-size: 14px; color: var(--fg-muted); line-height: 1.85; }
.steps code {
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--surface-2);
  font-family: ui-monospace, monospace;
  font-size: 13px;
  direction: ltr;
  display: inline-block;
}

/* ---------- سلب مسئولیت ---------- */
.notice {
  display: flex;
  gap: 15px;
  padding: 22px 24px;
  border: 1px solid rgba(251, 191, 36, .3);
  border-radius: var(--r);
  background: rgba(251, 191, 36, .08);
}
.notice svg { flex: 0 0 auto; width: 24px; height: 24px; stroke: var(--warn); margin-top: 3px; }
.notice h3 { font-size: 16px; margin-bottom: 7px; }
.notice p { margin: 0; font-size: 14.5px; color: var(--fg-muted); line-height: 1.9; }

/* ---------- فوتر ---------- */
.footer {
  padding-block: 48px 30px;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 34px;
  margin-bottom: 34px;
}
.footer h4 { font-size: 14px; margin-bottom: 14px; }
.footer h5 { font-size: 14px; margin: 0 0 14px; font-weight: 800; color: var(--fg); }
.footer ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 9px; }
.footer a, .footer p { font-size: 14px; color: var(--fg-muted); }
.footer a:hover { color: var(--brand-2); }
.footer p { margin: 12px 0 0; line-height: 1.9; }
.footer__desc { max-width: 42ch; }

.footer__bottom {
  padding-top: 22px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  font-size: 13px;
  color: var(--fg-dim);
}

/* ---------- کمکی‌ها ---------- */
[hidden] { display: none !important; }
.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;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

.toast {
  position: fixed;
  inset-block-end: 26px;
  inset-inline-start: 50%;
  transform: translate(50%, 120%);
  z-index: 300;
  padding: 13px 24px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-full);
  background: var(--bg-soft);
  box-shadow: var(--shadow-lg);
  font-size: 14px;
  font-weight: 600;
  transition: transform .4s var(--ease);
}
.toast.show { transform: translate(50%, 0); }

/* ---------- واکنش‌گرا ---------- */
@media (max-width: 980px) {
  .hero__grid, .tg { grid-template-columns: 1fr; }
  .hero__visual { order: -1; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .nav__links {
    position: fixed;
    inset: var(--nav-h) 0 auto;
    flex-direction: column;
    gap: 2px;
    padding: 14px clamp(16px, 4vw, 32px) 20px;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    transform: translateY(-130%);
    transition: transform .35s var(--ease);
  }
  .nav__links.open { transform: none; }
  .nav__links a { padding: 13px 15px; border-radius: var(--r-sm); }
  .nav__burger { display: grid; }
  .brand__sub { display: none; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); gap: 18px; }
  .footer__grid { grid-template-columns: 1fr; gap: 26px; }
  .opt { padding: 15px 17px; font-size: 14.5px; }
  .btn { padding: 12px 22px; }
}

@media print {
  .nav, .footer, .wizard__nav, .tree-tools, .hero__visual { display: none; }
  body { background: #fff; color: #000; }
  body::before, body::after { display: none; }
  .method__body, .node__body { display: block !important; }
}