:root {
  --bg: #070b16;
  --bg-2: #0b1122;
  --panel: rgba(17, 25, 48, 0.72);
  --panel-solid: #111931;
  --panel-2: rgba(255, 255, 255, 0.035);
  --border: rgba(148, 163, 214, 0.14);
  --border-strong: rgba(148, 163, 214, 0.28);
  --text: #e8ecf8;
  --muted: #94a0c2;
  --faint: #5f6a8d;
  --accent: #34d399;
  --accent-2: #22d3ee;
  --accent-ink: #04241a;
  --gold: #f5c451;
  --danger: #fb7185;
  --warn: #fbbf24;
  --glow: 0 0 0 1px rgba(52, 211, 153, 0.35), 0 10px 40px -10px rgba(52, 211, 153, 0.45);
  --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.6);
  --radius: 18px;
  --font-ar: "IBM Plex Sans Arabic", "Inter", system-ui, sans-serif;
  --font-en: "Inter", "IBM Plex Sans Arabic", system-ui, sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Sans Arabic", ui-monospace, monospace;
}

:root[data-theme="light"] {
  --bg: #f4f6fb;
  --bg-2: #eef1f8;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-solid: #ffffff;
  --panel-2: rgba(15, 23, 42, 0.035);
  --border: rgba(15, 23, 42, 0.09);
  --border-strong: rgba(15, 23, 42, 0.18);
  --text: #0f172a;
  --muted: #4b5675;
  --faint: #8a93ad;
  --accent: #059669;
  --accent-2: #0891b2;
  --accent-ink: #ffffff;
  --gold: #b7791f;
  --glow: 0 0 0 1px rgba(5, 150, 105, 0.3), 0 10px 30px -12px rgba(5, 150, 105, 0.35);
  --shadow: 0 20px 50px -28px rgba(15, 23, 42, 0.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ar);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
html[lang="en"] body { font-family: var(--font-en); }

/* Ambient background */
.bg-mesh {
  position: fixed; inset: -20vh -20vw; z-index: -2; pointer-events: none;
  background:
    radial-gradient(40vw 40vw at 15% 10%, rgba(52, 211, 153, 0.16), transparent 60%),
    radial-gradient(35vw 35vw at 85% 0%, rgba(34, 211, 238, 0.14), transparent 60%),
    radial-gradient(45vw 45vw at 70% 90%, rgba(245, 196, 81, 0.08), transparent 60%);
  filter: blur(10px);
  animation: drift 24s ease-in-out infinite alternate;
}
.bg-grid {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 0%, black 20%, transparent 70%);
  opacity: .5;
}
@keyframes drift { to { transform: translate3d(3vw, 2vh, 0) scale(1.05); } }

.boot { height: 100vh; display: grid; place-content: center; gap: 12px; text-align: center; color: var(--muted); font-family: var(--font-en); letter-spacing: .08em; }
.boot-mark { font-size: 44px; animation: pulse 1.4s ease-in-out infinite; }
@keyframes pulse { 50% { transform: scale(1.12); opacity: .7; } }

.wrap { max-width: 1240px; margin: 0 auto; padding: 0 20px; }

/* Nav */
.nav { position: sticky; top: 0; z-index: 20; backdrop-filter: blur(14px); background: color-mix(in srgb, var(--bg) 70%, transparent); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; gap: 14px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-en); font-weight: 800; letter-spacing: -.01em; font-size: 19px; }
.brand-mark { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: var(--accent-ink); font-size: 18px; box-shadow: var(--glow); }
.brand small { font-weight: 500; color: var(--muted); font-size: 13px; margin-inline-start: 2px; letter-spacing: .02em; }
.brand-ar { font-family: var(--font-ar); font-weight: 700; font-size: 22px; }
.nav-spacer { flex: 1; }
.status { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--muted); padding: 6px 12px; border: 1px solid var(--border); border-radius: 999px; background: var(--panel-2); font-family: var(--font-en); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--faint); }
.dot.ok { background: var(--accent); box-shadow: 0 0 0 4px rgba(52, 211, 153, .18); }
.dot.busy { background: var(--warn); animation: pulse 1s infinite; }
.dot.err { background: var(--danger); }
.icon-btn { height: 36px; min-width: 36px; padding: 0 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); cursor: pointer; font: inherit; font-size: 13px; display: inline-flex; align-items: center; gap: 6px; transition: .2s; }
.icon-btn:hover { border-color: var(--border-strong); background: var(--panel); }

/* Hero */
.hero { padding: 64px 0 28px; text-align: center; }
.eyebrow { display: inline-flex; gap: 8px; align-items: center; font-size: 12.5px; color: var(--accent); padding: 6px 14px; border-radius: 999px; border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); background: color-mix(in srgb, var(--accent) 8%, transparent); font-family: var(--font-en); letter-spacing: .02em; }
.hero h1 { font-size: clamp(34px, 5.6vw, 64px); line-height: 1.12; margin: 20px auto 16px; max-width: 900px; font-weight: 700; letter-spacing: -.02em; }
.grad { background: linear-gradient(100deg, var(--accent) 10%, var(--accent-2) 55%, var(--gold) 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--muted); font-size: clamp(15px, 1.8vw, 18px); max-width: 720px; margin: 0 auto; }
.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 22px; }
.chip { font-size: 12.5px; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--border); background: var(--panel-2); color: var(--muted); font-family: var(--font-en); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 40px auto 0; max-width: 980px; }
.stat { padding: 18px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--panel); backdrop-filter: blur(12px); text-align: center; }
.stat b { display: block; font-family: var(--font-en); font-size: 28px; font-weight: 800; letter-spacing: -.02em; }
.stat span { color: var(--muted); font-size: 13px; }

/* Templates */
.section-title { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin: 44px 0 14px; }
.section-title h2 { font-size: 20px; margin: 0; }
.section-title span { color: var(--muted); font-size: 13.5px; }
.templates { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.tpl { text-align: start; padding: 14px 16px; border-radius: 14px; border: 1px solid var(--border); background: var(--panel); cursor: pointer; color: var(--text); font: inherit; transition: transform .18s, border-color .18s, box-shadow .18s; }
.tpl:hover { transform: translateY(-2px); border-color: var(--border-strong); }
.tpl.active { border-color: color-mix(in srgb, var(--accent) 60%, transparent); box-shadow: var(--glow); }
.tpl-top { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 14.5px; }
.tpl-emoji { font-size: 18px; }
.tpl p { margin: 6px 0 0; color: var(--muted); font-size: 12.5px; line-height: 1.5; }

/* Workspace */
.workspace { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 18px; margin-top: 22px; align-items: start; }
.card { border-radius: var(--radius); border: 1px solid var(--border); background: var(--panel); backdrop-filter: blur(14px); box-shadow: var(--shadow); }
.card-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 18px; border-bottom: 1px solid var(--border); gap: 10px; }
.card-head h3 { margin: 0; font-size: 15.5px; display: flex; gap: 8px; align-items: center; }
.card-body { padding: 18px; }
.sticky { position: sticky; top: 80px; }

.field { margin-bottom: 16px; }
.field-label { display: flex; align-items: center; justify-content: space-between; font-size: 13px; color: var(--muted); margin-bottom: 7px; font-weight: 500; }
textarea, input[type="text"] {
  width: 100%; border-radius: 12px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  font: inherit; font-size: 14.5px; padding: 11px 13px; outline: none; transition: border-color .2s, box-shadow .2s; resize: vertical;
}
textarea:focus, input[type="text"]:focus { border-color: color-mix(in srgb, var(--accent) 60%, transparent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 14%, transparent); }
textarea.mono { font-family: var(--mono); font-size: 13px; direction: ltr; text-align: left; }
.hint { font-size: 12px; color: var(--faint); margin-top: 6px; }
.hint.err { color: var(--danger); }

.seg { display: inline-flex; padding: 3px; border-radius: 10px; border: 1px solid var(--border); background: var(--panel-2); }
.seg button { border: 0; background: transparent; color: var(--muted); font: inherit; font-size: 12px; padding: 4px 10px; border-radius: 7px; cursor: pointer; }
.seg button.on { background: var(--panel-solid); color: var(--text); box-shadow: 0 1px 3px rgba(0,0,0,.25); }

.opts { display: flex; flex-direction: column; gap: 8px; }
.opt { display: grid; grid-template-columns: 34px minmax(0, 150px) minmax(0, 1fr) auto; gap: 8px; align-items: center; animation: rise .25s ease; }
.opt input { padding: 9px 11px; font-size: 13.5px; }
.opt .key { font-family: var(--mono); font-size: 12.5px; direction: ltr; text-align: left; }
.letter { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; font-family: var(--font-en); font-weight: 700; font-size: 14px; background: var(--panel-2); border: 1px solid var(--border); color: var(--muted); }
.opt-actions { display: flex; gap: 4px; }
.mini { width: 30px; height: 30px; border-radius: 8px; border: 1px solid transparent; background: transparent; color: var(--faint); cursor: pointer; font-size: 14px; }
.mini:hover { background: var(--panel-2); color: var(--text); border-color: var(--border); }
.add { margin-top: 10px; width: 100%; padding: 10px; border-radius: 12px; border: 1px dashed var(--border-strong); background: transparent; color: var(--muted); font: inherit; font-size: 13.5px; cursor: pointer; transition: .2s; }
.add:hover { color: var(--accent); border-color: var(--accent); }

.run-row { display: flex; gap: 10px; align-items: center; margin-top: 6px; }
.run {
  flex: 1; height: 50px; border: 0; border-radius: 14px; cursor: pointer; font: inherit; font-weight: 700; font-size: 16px;
  color: var(--accent-ink); background: linear-gradient(100deg, var(--accent), var(--accent-2)); box-shadow: var(--glow);
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; transition: transform .15s, filter .2s;
}
.run:hover { filter: brightness(1.06); transform: translateY(-1px); }
.run:disabled { opacity: .65; cursor: progress; transform: none; }
.kbd { font-family: var(--font-en); font-size: 11px; padding: 2px 6px; border-radius: 6px; background: rgba(0,0,0,.18); }
.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2.5px solid rgba(0,0,0,.2); border-top-color: var(--accent-ink); animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Result */
.empty { text-align: center; padding: 40px 18px; color: var(--muted); }
.empty-mark { font-size: 44px; opacity: .85; margin-bottom: 8px; }
.result { animation: rise .35s ease; }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }
.verdict { display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: center; }
.gauge { position: relative; width: 116px; height: 116px; }
.gauge svg { transform: rotate(-90deg); }
.gauge-center { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.gauge-center b { font-family: var(--font-en); font-size: 21px; font-weight: 800; letter-spacing: -.02em; }
.gauge-center span { font-size: 11px; color: var(--muted); }
.answer-letter { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; font-family: var(--font-en); font-weight: 800; color: var(--accent-ink); background: linear-gradient(135deg, var(--accent), var(--accent-2)); margin-inline-end: 8px; }
.answer-title { font-size: 20px; font-weight: 700; display: flex; align-items: center; line-height: 1.35; }
.answer-key { font-family: var(--mono); font-size: 12.5px; color: var(--muted); margin-top: 6px; direction: ltr; text-align: start; unicode-bidi: plaintext; }
.badge { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 999px; margin-top: 10px; }
.badge.ok { color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.badge.review { color: var(--warn); background: color-mix(in srgb, var(--warn) 12%, transparent); }
.badge.low { color: var(--danger); background: color-mix(in srgb, var(--danger) 12%, transparent); }

.bars { margin-top: 20px; display: flex; flex-direction: column; gap: 10px; }
.bar-row { display: grid; grid-template-columns: 26px 1fr 56px; gap: 10px; align-items: center; font-size: 13px; }
.bar-letter { font-family: var(--font-en); font-weight: 700; color: var(--muted); text-align: center; }
.bar-main { min-width: 0; }
.bar-text { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-bottom: 4px; }
.bar-track { height: 8px; border-radius: 99px; background: var(--panel-2); overflow: hidden; border: 1px solid var(--border); }
.bar-fill { height: 100%; border-radius: 99px; background: var(--faint); width: 0; transition: width .8s cubic-bezier(.2, .9, .2, 1); }
.bar-row.win .bar-fill { background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.bar-row.win .bar-letter { color: var(--accent); }
.bar-pct { font-family: var(--font-en); font-variant-numeric: tabular-nums; text-align: end; color: var(--muted); font-size: 12.5px; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.meta span { font-size: 12px; color: var(--muted); padding: 4px 10px; border-radius: 8px; background: var(--panel-2); border: 1px solid var(--border); font-family: var(--font-en); }
.error-box { padding: 14px; border-radius: 12px; border: 1px solid color-mix(in srgb, var(--danger) 40%, transparent); background: color-mix(in srgb, var(--danger) 8%, transparent); color: var(--danger); font-size: 13.5px; }

.history { margin-top: 18px; }
.history h4 { font-size: 13px; color: var(--muted); margin: 0 0 8px; font-weight: 600; }
.hist-item { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--panel-2); margin-bottom: 6px; font-size: 13px; cursor: pointer; }
.hist-item:hover { border-color: var(--border-strong); }
.hist-q { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--muted); }
.hist-a { font-weight: 600; }
.hist-p { font-family: var(--font-en); font-size: 12px; color: var(--faint); }

/* How + API */
.how { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.how .card-body h4 { margin: 10px 0 6px; font-size: 15px; }
.how .card-body p { margin: 0; color: var(--muted); font-size: 13.5px; }
.step { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; font-family: var(--font-en); font-weight: 800; background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }
.code-tabs { display: flex; gap: 6px; }
pre { margin: 0; padding: 16px 18px; overflow: auto; font-family: var(--mono); font-size: 12.5px; line-height: 1.65; direction: ltr; text-align: left; color: var(--text); background: var(--panel-2); border-radius: 0 0 var(--radius) var(--radius); max-height: 360px; }

footer { margin: 60px 0 30px; padding-top: 24px; border-top: 1px solid var(--border); color: var(--faint); font-size: 13px; display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; }
footer a, .link { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }

.toast { position: fixed; bottom: 24px; inset-inline-start: 50%; transform: translateX(50%); background: var(--panel-solid); border: 1px solid var(--border-strong); padding: 10px 16px; border-radius: 12px; box-shadow: var(--shadow); font-size: 13.5px; z-index: 50; animation: rise .25s ease; }
html[dir="ltr"] .toast { transform: translateX(-50%); }

@media (max-width: 1000px) {
  .workspace { grid-template-columns: 1fr; }
  .sticky { position: static; }
  .templates { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .how { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 14px; }
  .hero { padding-top: 40px; }
  .templates { grid-template-columns: 1fr; }
  .opt { grid-template-columns: 30px minmax(0, 1fr) auto; }
  .opt .key { grid-column: 2 / 4; order: 3; }
  .status .label, .icon-btn .label { display: none; }
  .verdict { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .answer-title { justify-content: center; }
}
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }

.hf-btn { background: color-mix(in srgb, var(--gold) 14%, transparent); border-color: color-mix(in srgb, var(--gold) 40%, transparent); font-weight: 600; }
.hf-btn:hover { background: color-mix(in srgb, var(--gold) 22%, transparent); }
.avatar { width: 22px; height: 22px; border-radius: 50%; }