/* ══ ورقة عمل الكسور — design tokens (Claymorphism / light) ══ */
:root {
  --bg: #eff6ff;
  --surface: #ffffff;
  --surface-2: #f1f5fd;
  --primary: #2563eb;
  --primary-dk: #1d4ed8;
  --primary-soft: #dbeafe;
  --secondary: #f59e0b;
  --secondary-soft: #fef3c7;
  --accent: #ec4899;
  --accent-soft: #fce7f3;
  --success: #16a34a;
  --success-soft: #dcfce7;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --fg: #0f172a;
  --muted-fg: #52658a;
  --border: #d6e2fa;
  --radius-sm: 14px;
  --radius: 22px;
  --radius-lg: 34px;
  --clay: 0 6px 0 rgba(37, 99, 235, .13), 0 16px 30px rgba(15, 23, 42, .09);
  --clay-sm: 0 4px 0 rgba(37, 99, 235, .11), 0 8px 18px rgba(15, 23, 42, .07);
  --clay-inset: inset 0 3px 0 rgba(255, 255, 255, .9);
  font-family: 'Cairo', ui-sans-serif, system-ui, sans-serif;
  line-height: 1.75;
  color: var(--fg);
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
h1, h2, h3, h4, .brand-text strong, .stat b, .dial-center b {
  font-family: 'Baloo Bhaijaan 2', 'Cairo', sans-serif;
  line-height: 1.35;
}
body { min-height: 100dvh; overflow-x: hidden; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 8px; }
.bg-blobs {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(38rem 38rem at 88% -8%, rgba(236, 72, 153, .16), transparent 62%),
    radial-gradient(34rem 34rem at -6% 12%, rgba(37, 99, 235, .18), transparent 60%),
    radial-gradient(30rem 30rem at 50% 108%, rgba(245, 158, 11, .15), transparent 60%);
}
.container { width: min(1120px, 100%); margin-inline: auto; padding-inline: 1.25rem; position: relative; z-index: 1; }
.section { position: relative; z-index: 1; padding: 3.75rem 0; }
.section-alt { background: linear-gradient(180deg, rgba(255, 255, 255, .72), rgba(255, 255, 255, .25)); border-block: 2px dashed var(--border); }
.section-head { max-width: 62ch; margin-bottom: 2rem; }
.section-head h2 { font-size: clamp(1.6rem, 3.4vw, 2.4rem); font-weight: 800; letter-spacing: -.5px; margin: .6rem 0 .5rem; }
.section-head p { color: var(--muted-fg); font-size: 1.02rem; }
.pill {
  display: inline-flex; align-items: center; gap: .45rem; font-size: .82rem; font-weight: 700;
  padding: .35rem .9rem; border-radius: 999px; color: var(--primary-dk);
  background: var(--primary-soft); border: 2px solid #c7ddfd;
}
.pill svg { width: 1rem; height: 1rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  font: inherit; font-weight: 700; font-size: .95rem; cursor: pointer;
  padding: .7rem 1.35rem; border-radius: 999px; border: 3px solid transparent;
  transition: transform .16s ease, box-shadow .16s ease, background .2s ease;
}
.btn svg { width: 1.1rem; height: 1.1rem; }
.btn:active { transform: translateY(3px); box-shadow: none !important; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 5px 0 var(--primary-dk); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 7px 0 var(--primary-dk); }
.btn-secondary { background: var(--secondary-soft); color: #92400e; border-color: #fcd34d; box-shadow: 0 4px 0 #fbbf24; }
.btn-secondary:hover { transform: translateY(-2px); }
.btn-ghost { background: var(--surface); color: var(--primary-dk); border-color: var(--border); box-shadow: var(--clay-sm); }
.btn-ghost:hover { transform: translateY(-2px); background: #f8fbff; }

/* ══ Topbar ══ */
.topbar {
  position: sticky; top: 0; z-index: 30;
  background: rgba(239, 246, 255, .84); backdrop-filter: blur(14px);
  border-bottom: 2px solid var(--border);
}
.topbar-inner {
  width: min(1120px, 100%); margin-inline: auto; padding: .6rem 1.25rem;
  display: flex; align-items: center; gap: 1rem; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: .7rem; }
.brand-mark {
  width: 2.6rem; height: 2.6rem; border-radius: 16px; display: grid; place-items: center;
  background: var(--primary); color: #fff; box-shadow: 0 4px 0 var(--primary-dk);
}
.brand-mark svg { width: 1.35rem; height: 1.35rem; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 1.15rem; font-weight: 800; }
.brand-text small { font-size: .74rem; color: var(--muted-fg); font-weight: 600; }
.nav-links { display: flex; gap: .25rem; }
.nav-links a {
  color: var(--muted-fg); text-decoration: none; font-size: .9rem; font-weight: 700;
  padding: .4rem .8rem; border-radius: 999px; transition: background .2s, color .2s;
}
.nav-links a:hover { background: var(--primary-soft); color: var(--primary-dk); }

/* ══ Hero ══ */
.hero { padding: 3.25rem 0 1.5rem; text-align: center; position: relative; z-index: 1; }
.hero h1 { font-size: clamp(2rem, 5.2vw, 3.3rem); font-weight: 800; letter-spacing: -1px; margin: 1rem 0 .8rem; }
.hero h1 .hl { color: var(--accent); position: relative; white-space: nowrap; }
.hero h1 .hl::after {
  content: ""; position: absolute; inset-inline: -.15em; bottom: .1em; height: .32em;
  background: var(--accent-soft); border-radius: 999px; z-index: -1;
}
.hero > .container > p { color: var(--muted-fg); font-size: 1.08rem; max-width: 60ch; margin: 0 auto; }
.student-fields {
  display: flex; flex-wrap: wrap; gap: .8rem; justify-content: center; margin: 2rem 0 1.5rem;
}
.student-fields label {
  display: flex; flex-direction: column; gap: .35rem; text-align: start;
  font-size: .78rem; font-weight: 700; color: var(--muted-fg); letter-spacing: .02em;
}
.student-fields input {
  width: clamp(9rem, 22vw, 14rem); font: inherit; padding: .5rem .8rem;
  border: 2px dashed #b9cdf3; border-radius: var(--radius-sm); background: rgba(255, 255, 255, .7);
  color: var(--fg);
}
.student-fields input:focus { border-style: solid; border-color: var(--primary); outline: none; }
.hero-stats { display: flex; gap: .8rem; justify-content: center; flex-wrap: wrap; }
.stat {
  background: var(--surface); border: 3px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--clay-sm); padding: .8rem 1.4rem; min-width: 8.5rem;
}
.stat b { display: block; font-size: 1.9rem; font-weight: 800; color: var(--primary); }
.stat span { font-size: .82rem; color: var(--muted-fg); font-weight: 600; }

/* ══ Fraction glyph ══ */
.frac { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; line-height: 1.15; font-weight: 700; margin-inline: .18em; }
.frac .num { border-bottom: 2.5px solid currentColor; padding: 0 .3em .06em; }
.frac .den { padding: .06em .3em 0; }
.frac.sm { font-size: .95em; }
.frac.ok { color: var(--success); }
.frac.bad { color: var(--danger); text-decoration: line-through; }
.mixed { display: inline-flex; align-items: center; gap: .12em; vertical-align: middle; font-weight: 700; }
.mixed b { font-size: 1.05em; }
.mixed.sm { font-size: .95em; }

/* ══ Basics ══ */
.parts-grid { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.info-card {
  background: var(--surface); border: 3px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--clay), var(--clay-inset); padding: 1.75rem;
}
.info-card h3 { display: flex; align-items: center; gap: .5rem; font-size: 1.15rem; font-weight: 800; margin-bottom: .9rem; }
.info-card h3 svg { width: 1.2rem; height: 1.2rem; color: var(--primary); }
.frac-big { display: grid; place-items: center; font-size: 3.4rem; padding: .4rem 0 1rem; color: var(--primary-dk); }
.parts-list { list-style: none; display: grid; gap: .55rem; }
.parts-list li { font-size: .96rem; color: var(--muted-fg); }
.parts-list b { color: var(--fg); }
.c-blue { color: var(--primary) !important; }
.c-amber { color: #b45309 !important; }
.c-pink { color: var(--accent) !important; }
.note { margin-top: 1rem; font-size: .93rem; color: var(--muted-fg); background: var(--surface-2); border-radius: var(--radius-sm); padding: .7rem .9rem; }
.rules { display: grid; gap: .6rem; }
.rules p { font-size: .95rem; color: var(--muted-fg); background: var(--surface-2); border-radius: var(--radius-sm); padding: .6rem .85rem; border-inline-start: 5px solid var(--primary-soft); }
.rules b { color: var(--fg); }
.mini-examples { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.chip {
  display: inline-flex; align-items: center; gap: .35rem; font-size: .88rem; font-weight: 700;
  background: var(--surface-2); border: 2px solid var(--border); border-radius: 999px; padding: .28rem .8rem;
}

/* ══ Visualizer ══ */
.viz-wrap {
  background: var(--surface); border: 3px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--clay), var(--clay-inset); padding: 1.75rem;
  display: grid; gap: 1.5rem;
}
.viz-controls { display: grid; gap: 1rem; }
.slider-row { display: grid; gap: .4rem; font-weight: 700; color: var(--muted-fg); font-size: .95rem; }
.slider-row span b { color: var(--primary); font-size: 1.15rem; }
input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 14px; border-radius: 999px; background: var(--primary-soft); border: 2px solid #c7ddfd; }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 30px; height: 30px; border-radius: 50%;
  background: var(--primary); border: 3px solid #fff; box-shadow: 0 3px 0 var(--primary-dk); cursor: grab;
}
input[type="range"]::-moz-range-thumb {
  width: 26px; height: 26px; border-radius: 50%; background: var(--primary);
  border: 3px solid #fff; box-shadow: 0 3px 0 var(--primary-dk); cursor: grab;
}
.viz-actions { display: flex; flex-wrap: wrap; gap: .6rem; }
.viz-stage { display: grid; gap: 1.25rem; grid-template-columns: minmax(150px, 220px) 1fr; align-items: center; }
.pie { width: 100%; height: auto; max-width: 220px; filter: drop-shadow(0 6px 12px rgba(15, 23, 42, .12)); }
.pie circle.pie-bg { fill: var(--surface-2); stroke: var(--border); stroke-width: 2; }
.pie path.slice { stroke: #fff; stroke-width: 1.5; }
.pie path.slice.on { fill: var(--secondary); }
.pie path.slice.off { fill: #e2e8f5; }
.viz-readouts { display: grid; gap: .6rem; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); }
.readout { background: var(--surface-2); border: 2px solid var(--border); border-radius: var(--radius-sm); padding: .55rem .8rem; }
.readout .k { display: block; font-size: .76rem; font-weight: 700; color: var(--muted-fg); }
.readout .v { font-size: 1.25rem; font-weight: 800; color: var(--primary-dk); }
.bar-model { display: flex; gap: 6px; }
.bar-cell { flex: 1; height: 62px; border-radius: 12px; border: 3px solid var(--border); background: var(--surface-2); transition: background .2s, transform .15s, border-color .2s; }
.bar-cell.on { background: var(--secondary); border-color: #fbbf24; transform: translateY(-2px); }
.compare-line { font-weight: 700; font-size: 1rem; color: var(--muted-fg); text-align: center; background: var(--surface-2); border-radius: var(--radius-sm); padding: .6rem 1rem; }

/* ══ Types ══ */
.type-grid { display: grid; gap: 1.1rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.type-card {
  background: var(--surface); border: 3px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--clay-sm), var(--clay-inset); padding: 1.4rem;
  transition: transform .2s ease, box-shadow .2s ease;
}
.type-card:hover { transform: translateY(-4px); box-shadow: var(--clay); }
.type-icon { width: 2.9rem; height: 2.9rem; border-radius: 16px; display: grid; place-items: center; margin-bottom: .8rem; }
.type-icon svg { width: 1.4rem; height: 1.4rem; }
.t1 .type-icon { background: var(--primary-soft); color: var(--primary-dk); }
.t2 .type-icon { background: var(--secondary-soft); color: #b45309; }
.t3 .type-icon { background: var(--accent-soft); color: #be185d; }
.t4 .type-icon { background: var(--success-soft); color: #15803d; }
.t5 .type-icon { background: #ede9fe; color: #6d28d9; }
.type-card h3 { font-size: 1.12rem; font-weight: 800; margin-bottom: .4rem; }
.type-card p { font-size: .93rem; color: var(--muted-fg); margin-bottom: .9rem; }
.type-ex { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; font-size: 1.05rem; background: var(--surface-2); border-radius: var(--radius-sm); padding: .5rem .8rem; }
.type-ex .arrow { color: var(--muted-fg); font-weight: 700; }

/* ══ Solved examples ══ */
.ex-toolbar { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 1.2rem; }
.ex-list { display: grid; gap: .9rem; }
.ex-card {
  background: var(--surface); border: 3px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--clay-sm), var(--clay-inset); overflow: hidden;
}
.ex-head {
  width: 100%; display: flex; align-items: center; gap: .9rem; text-align: start;
  background: transparent; border: 0; font: inherit; cursor: pointer; padding: 1.05rem 1.3rem;
  transition: background .2s ease;
}
.ex-head:hover { background: #f8fbff; }
.ex-num {
  flex: none; font-size: .78rem; font-weight: 800; padding: .25rem .7rem; border-radius: 999px;
  background: var(--primary-soft); color: var(--primary-dk);
}
.ex-head h3 { flex: 1; font-size: 1.05rem; font-weight: 700; display: flex; align-items: center; flex-wrap: wrap; gap: .1rem; }
.chev { transition: transform .28s ease; color: var(--muted-fg); display: grid; place-items: center; }
.chev svg { width: 1.3rem; height: 1.3rem; }
.ex-card.open .chev { transform: rotate(180deg); }
.ex-body { max-height: 0; opacity: 0; overflow: hidden; transition: max-height .35s ease, opacity .3s ease, padding .3s ease; padding: 0 1.3rem; }
.ex-card.open .ex-body { max-height: 1400px; opacity: 1; padding: 0 1.3rem 1.3rem; }
.ex-problem { font-weight: 700; background: var(--primary-soft); border-radius: var(--radius-sm); padding: .6rem .9rem; margin-bottom: .8rem; font-size: .95rem; }
.steps { display: grid; gap: .55rem; padding-inline-start: 1.2rem; }
.steps li { font-size: .95rem; color: #24334f; }
.answer {
  margin-top: .9rem; display: flex; align-items: center; flex-wrap: wrap; gap: .5rem;
  font-weight: 700; background: var(--success-soft); border: 2px solid #86efac;
  border-radius: var(--radius-sm); padding: .6rem .9rem; color: #14532d;
}
.answer svg { width: 1.2rem; height: 1.2rem; color: var(--success); }

/* ══ Rules summary ══ */
.rules-panel, .warn-card {
  background: var(--surface); border: 3px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--clay), var(--clay-inset); padding: 1.6rem; margin-top: 1.5rem;
}
.rules-panel h3, .warn-card h3 { display: flex; align-items: center; gap: .5rem; font-size: 1.18rem; font-weight: 800; margin-bottom: 1rem; }
.rules-panel h3 svg { width: 1.25rem; height: 1.25rem; color: var(--primary); }
.warn-card h3 svg { width: 1.25rem; height: 1.25rem; color: var(--secondary); }
.table-scroll { overflow-x: auto; border-radius: var(--radius-sm); }
table.rules-table { width: 100%; border-collapse: collapse; min-width: 520px; font-size: .93rem; }
.rules-table th, .rules-table td { padding: .7rem .8rem; text-align: start; border-bottom: 2px solid var(--surface-2); }
.rules-table thead th { background: var(--primary-soft); color: var(--primary-dk); font-weight: 800; }
.rules-table tbody tr:nth-child(even) { background: #fafcff; }
.rules-table td:first-child { font-weight: 700; white-space: nowrap; }
.warn-card { border-color: #fde68a; background: linear-gradient(180deg, #fffbeb, #fff); }
.warn-card ul { display: grid; gap: .6rem; padding-inline-start: 1.2rem; }
.warn-card li { font-size: .95rem; color: #4a3410; }

/* ══ Practice ══ */
.progress-bar-wrap {
  background: var(--surface); border: 3px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--clay-sm); padding: 1rem 1.2rem; margin-bottom: 1.4rem;
}
.progress-meta { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem; font-weight: 700; font-size: .9rem; color: var(--muted-fg); margin-bottom: .55rem; }
#scoreLabel { color: var(--primary-dk); }
.progress-track { height: 16px; border-radius: 999px; background: var(--surface-2); border: 2px solid var(--border); overflow: hidden; }
.progress-fill { height: 100%; width: 0; border-radius: 999px; background: linear-gradient(90deg, var(--primary), var(--accent)); transition: width .4s ease; }
.tabs { display: flex; flex-wrap: wrap; gap: .4rem; background: var(--surface); border: 3px solid var(--border); border-radius: 999px; padding: .35rem; margin-bottom: 1.4rem; box-shadow: var(--clay-sm); }
.tab {
  flex: 1 1 auto; font: inherit; font-weight: 700; font-size: .9rem; cursor: pointer;
  padding: .5rem 1rem; border-radius: 999px; border: 0; background: transparent; color: var(--muted-fg);
  transition: background .2s, color .2s, transform .15s;
}
.tab:hover { background: var(--surface-2); }
.tab.active { background: var(--primary); color: #fff; box-shadow: 0 3px 0 var(--primary-dk); }
.panel { display: none; animation: fadeUp .35s ease; }
.panel.active { display: block; }
.hint { display: flex; align-items: center; gap: .5rem; font-size: .92rem; font-weight: 600; color: var(--muted-fg); background: var(--surface-2); border-radius: var(--radius-sm); padding: .6rem .9rem; margin-bottom: 1rem; }
.hint svg { width: 1.15rem; height: 1.15rem; color: var(--primary); flex: none; }

/* ══ Question cards ══ */
.q-list { display: grid; gap: .9rem; }
.q-card {
  background: var(--surface); border: 3px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--clay-sm), var(--clay-inset); padding: 1.15rem 1.25rem;
  transition: border-color .25s ease, background .25s ease;
}
.q-card.is-correct { border-color: #86efac; background: linear-gradient(180deg, #f6fff9, var(--surface)); }
.q-card.is-wrong { border-color: #fca5a5; background: linear-gradient(180deg, #fff6f6, var(--surface)); }
.q-head { display: flex; align-items: flex-start; gap: .7rem; margin-bottom: .9rem; }
.q-index {
  flex: none; width: 1.9rem; height: 1.9rem; border-radius: 50%; display: grid; place-items: center;
  background: var(--primary-soft); color: var(--primary-dk); font-weight: 800; font-size: .85rem;
}
.q-text { font-weight: 700; font-size: 1rem; flex: 1; }
.q-text .frac { font-size: 1.05em; }
.options { display: grid; gap: .55rem; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
.opt {
  font: inherit; font-weight: 700; font-size: 1rem; cursor: pointer; text-align: center;
  padding: .65rem .8rem; border-radius: var(--radius-sm); border: 3px solid var(--border);
  background: var(--surface); color: var(--fg);
  transition: transform .15s ease, border-color .2s, background .2s, box-shadow .15s;
  display: flex; align-items: center; justify-content: center; gap: .35rem;
}
.opt:hover:not(:disabled) { transform: translateY(-3px); border-color: var(--primary); background: #f8fbff; }
.opt:disabled { cursor: default; }
.opt.chosen-wrong { background: var(--danger-soft); border-color: #fca5a5; color: #7f1d1d; }
.opt.chosen-right { background: var(--success-soft); border-color: #4ade80; color: #14532d; box-shadow: 0 4px 0 #86efac; }
.opt.reveal { border-color: #4ade80; background: #f0fdf4; }
.inputs { display: flex; align-items: center; gap: .7rem; flex-wrap: wrap; }
.frac-input { display: inline-grid; gap: .25rem; justify-items: center; }
.frac-input input {
  width: 5.2rem; font: inherit; font-weight: 800; font-size: 1.15rem; text-align: center;
  padding: .4rem .3rem; border: 3px solid var(--border); border-radius: 12px; background: var(--surface);
  color: var(--primary-dk);
}
.frac-input.small input { width: 4.2rem; }
.frac-input input:focus { border-color: var(--primary); outline: none; }
.frac-input input.ok { border-color: #4ade80; background: #f0fdf4; color: #14532d; }
.frac-input input.bad { border-color: #fca5a5; background: #fff5f5; color: #7f1d1d; }
.frac-line { width: 4.6rem; height: 3px; border-radius: 3px; background: var(--fg); }
.frac-input.small .frac-line { width: 3.6rem; }
.op-symbol { font-size: 1.6rem; font-weight: 800; color: var(--muted-fg); }
.whole-input {
  width: 4.4rem; font: inherit; font-weight: 800; font-size: 1.15rem; text-align: center;
  padding: .4rem .3rem; border: 3px solid var(--border); border-radius: 12px;
  background: var(--surface); color: var(--primary-dk);
}
.whole-input:focus { border-color: var(--primary); outline: none; }
.whole-input.ok { border-color: #4ade80; background: #f0fdf4; color: #14532d; }
.whole-input.bad { border-color: #fca5a5; background: #fff5f5; color: #7f1d1d; }
.compare-btns { display: flex; gap: .6rem; flex-wrap: wrap; }
.compare-btns .opt { min-width: 4rem; font-size: 1.3rem; }
.q-foot { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; margin-top: .9rem; }
.btn-check {
  font: inherit; font-weight: 700; font-size: .9rem; cursor: pointer; padding: .5rem 1.1rem;
  border-radius: 999px; border: 3px solid var(--primary-dk); background: var(--primary); color: #fff;
  box-shadow: 0 3px 0 var(--primary-dk);
}
.btn-check:active { transform: translateY(2px); box-shadow: none; }
.btn-check:disabled { opacity: .45; cursor: not-allowed; box-shadow: none; }
.btn-solve {
  font: inherit; font-weight: 700; font-size: .88rem; cursor: pointer; padding: .45rem 1rem;
  border-radius: 999px; border: 3px solid var(--border); background: var(--surface); color: var(--muted-fg);
}
.btn-solve:hover { border-color: var(--primary); color: var(--primary-dk); }
.feedback {
  margin-top: .8rem; font-size: .93rem; font-weight: 600; border-radius: var(--radius-sm);
  padding: .65rem .9rem; display: flex; gap: .5rem; align-items: flex-start;
}
.feedback svg { width: 1.15rem; height: 1.15rem; flex: none; margin-top: .18rem; }
.feedback.good { background: var(--success-soft); color: #14532d; border: 2px solid #86efac; }
.feedback.bad { background: var(--danger-soft); color: #7f1d1d; border: 2px solid #fca5a5; }
.feedback.info { background: var(--primary-soft); color: var(--primary-dk); border: 2px solid #c7ddfd; }
.practice-actions { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.6rem; }

/* ══ Shading activity ══ */
.shade-card {
  background: var(--surface); border: 3px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--clay), var(--clay-inset); padding: 1.75rem; display: grid; gap: 1.2rem;
}
.shade-top { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center; }
.shade-target { display: flex; flex-direction: column; }
.shade-target .k { font-size: .8rem; font-weight: 700; color: var(--muted-fg); }
.shade-target .v { font-size: 1.8rem; font-weight: 800; color: var(--accent); font-family: 'Baloo Bhaijaan 2', sans-serif; }
.shade-meta { display: flex; align-items: center; gap: .8rem; flex-wrap: wrap; }
.inline-field { display: flex; align-items: center; gap: .5rem; font-size: .88rem; font-weight: 700; color: var(--muted-fg); }
.inline-field select {
  font: inherit; font-weight: 700; padding: .35rem .6rem; border-radius: 12px;
  border: 3px solid var(--border); background: var(--surface); color: var(--primary-dk); cursor: pointer;
}
.shade-grid { display: flex; flex-wrap: wrap; gap: 7px; }
.shade-cell {
  flex: 1 1 44px; height: 74px; cursor: pointer; border-radius: 14px;
  border: 3px solid var(--border); background: var(--surface-2); padding: 0;
  transition: background .18s, border-color .18s, transform .15s;
}
.shade-cell:hover { transform: translateY(-3px); border-color: var(--primary); }
.shade-cell.on { background: var(--secondary); border-color: #fbbf24; box-shadow: inset 0 -4px 0 rgba(180, 83, 9, .25); }
.shade-actions { display: flex; flex-wrap: wrap; gap: .7rem; }
.shade-feedback { font-weight: 700; font-size: .98rem; border-radius: var(--radius-sm); padding: .7rem 1rem; }
.shade-feedback.good { background: var(--success-soft); color: #14532d; border: 2px solid #86efac; }
.shade-feedback.bad { background: var(--danger-soft); color: #7f1d1d; border: 2px solid #fca5a5; }
.shade-score-line { font-size: .9rem; color: var(--muted-fg); font-weight: 600; }
.shade-score-line b { color: var(--primary-dk); font-size: 1.1rem; }

/* ══ Results ══ */
.results-card {
  background: var(--surface); border: 3px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--clay), var(--clay-inset); padding: 2rem; text-align: center;
}
.results-head h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; margin: .6rem 0 .4rem; }
.results-head p { color: var(--muted-fg); max-width: 55ch; margin-inline: auto; }
.results-body { display: grid; gap: 2rem; grid-template-columns: minmax(200px, 260px) 1fr; align-items: center; margin: 1.8rem 0; text-align: start; }
.score-dial { position: relative; display: grid; place-items: center; }
.score-dial svg { width: 100%; max-width: 230px; transform: rotate(-90deg); }
.dial-bg { fill: none; stroke: var(--surface-2); stroke-width: 15; }
.dial-fill { fill: none; stroke: var(--accent); stroke-width: 15; stroke-linecap: round; stroke-dasharray: 0 400; transition: stroke-dasharray .6s ease; }
.dial-center { position: absolute; display: grid; place-items: center; line-height: 1.1; }
.dial-center b { font-size: 2.8rem; font-weight: 800; color: var(--primary-dk); }
.dial-center span { font-size: .85rem; color: var(--muted-fg); font-weight: 700; }
.results-breakdown { display: grid; gap: .6rem; }
.skill-row { display: flex; align-items: center; gap: .8rem; background: var(--surface-2); border-radius: var(--radius-sm); padding: .6rem .9rem; }
.skill-row .name { flex: 1; font-weight: 700; font-size: .95rem; }
.skill-row .val { font-weight: 800; color: var(--primary-dk); font-size: 1rem; }
.skill-bar { flex: 1.2; height: 10px; border-radius: 999px; background: var(--surface); border: 2px solid var(--border); overflow: hidden; min-width: 70px; }
.skill-bar i { display: block; height: 100%; background: var(--primary); border-radius: 999px; transition: width .5s ease; }
.results-actions { display: flex; justify-content: center; }

/* ══ Footer ══ */
.footer { position: relative; z-index: 1; background: #0f172a; color: #cbd5e1; padding: 3rem 0 1.5rem; margin-top: 2rem; }
.footer-inner { display: grid; gap: 2rem; grid-template-columns: 1.4fr 1fr; }
.footer h3 { display: flex; align-items: center; gap: .5rem; color: #fff; font-size: 1.2rem; font-weight: 800; margin-bottom: .7rem; }
.footer h3 svg { width: 1.3rem; height: 1.3rem; color: #60a5fa; }
.footer h4 { color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: .6rem; }
.footer p, .footer li { font-size: .92rem; color: #a9b6cc; }
.footer ol { display: grid; gap: .45rem; padding-inline-start: 1.1rem; }
.footer-bottom { border-top: 1px solid #23304a; margin-top: 2rem; padding-top: 1rem; text-align: center; font-size: .82rem; color: #8695ad; }

/* ══ Toast ══ */
.toast-wrap { position: fixed; inset-block-end: 1.25rem; inset-inline-start: 1.25rem; z-index: 90; display: grid; gap: .5rem; }
.toast {
  font-weight: 700; font-size: .92rem; padding: .7rem 1.15rem; border-radius: var(--radius-sm);
  box-shadow: 0 12px 28px rgba(15, 23, 42, .22); animation: toastIn .3s ease; max-width: min(88vw, 24rem);
}
.toast.success { background: #14532d; color: #dcfce7; }
.toast.error { background: #7f1d1d; color: #fee2e2; }
.toast.info { background: #1e3a8a; color: #dbeafe; }

/* ══ Animations ══ */
@keyframes fadeUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@keyframes toastIn { from { opacity: 0; transform: translateY(14px) scale(.96); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  html { scroll-behavior: auto; }
}

/* ══ Responsive ══ */
@media (max-width: 900px) {
  .viz-stage { grid-template-columns: 1fr; justify-items: center; }
  .viz-readouts { width: 100%; }
  .results-body { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav-links { display: none; }
  .section { padding: 2.75rem 0; }
  .ex-head { padding: .9rem 1rem; gap: .6rem; }
  .ex-head h3 { font-size: .98rem; }
  .ex-card.open .ex-body { max-height: 2400px; }
  .tabs { border-radius: var(--radius); }
  .tab { font-size: .84rem; padding: .5rem .7rem; }
  .shade-cell { height: 58px; }
}
@media (max-width: 480px) {
  .options { grid-template-columns: 1fr 1fr; }
  .frac-input input { width: 4.4rem; }
  .hero-stats .stat { flex: 1 1 40%; }
}

/* ══ Print ══ */
@media print {
  @page { margin: 14mm; }
  :root { --bg: #fff; }
  body { background: #fff; font-size: 11.5pt; }
  .bg-blobs, .topbar, .no-print, .toast-wrap, .tabs, .hint, .practice-actions, .results-actions { display: none !important; }
  .section { padding: .8rem 0; break-inside: avoid; }
  .section-alt { background: none; border-block: 1px solid #ddd; }
  .ex-body { max-height: none !important; opacity: 1 !important; padding: 0 1.1rem 1rem !important; }
  .chev { display: none; }
  .info-card, .type-card, .ex-card, .q-card, .viz-wrap, .shade-card, .results-card, .rules-panel, .warn-card {
    box-shadow: none !important; border-width: 1.5px !important; break-inside: avoid;
  }
  .panel { display: block !important; }
  .q-card { page-break-inside: avoid; }
  .footer { background: #fff; color: #333; margin-top: 1rem; padding: 1rem 0; }
  .footer h3, .footer h4 { color: #111; }
  .footer p, .footer li, .footer-bottom { color: #444; }
  .hero { padding: 0 0 .5rem; }
  a { text-decoration: none; color: inherit; }
}