/* NEETPGAI — "the paper, not the app". Tokens and rules live in DESIGN.md; this file only applies them. */

@font-face { font-family: "Source Sans 3"; src: url(fonts/SourceSans3-VF.woff2) format("woff2"); font-weight: 200 900; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url(fonts/IBMPlexMono-400.woff2) format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url(fonts/IBMPlexMono-500.woff2) format("woff2"); font-weight: 500; font-display: swap; }
@font-face { font-family: "General Sans"; src: url(fonts/GeneralSans-500.woff2) format("woff2"); font-weight: 500; font-display: swap; }

:root {
  --ground: #EEF1EC; --tint: #E1EAE4; --hair: #CBD3CC;
  --ink: #14231C; --ink-hover: #0B1610; --muted: #5B6B62; --faint: #8A968F;
  --accent: #0F6E56; --on-accent: #F4F6F2;
  --ok: #0F6E56; --ok-tint: #DCEBE3; --bad: #A3392F; --bad-tint: #F3E3E0; --warn: #8A5A00; --warn-tint: #F1E8CF;
  --sans: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --display: "General Sans", var(--sans);
  --rail: 64px;
  color-scheme: light;
}
/* Night ward: direction B from the 2026-09-14 consultation. Not an inversion: every surface is re-picked for a dark room. */
:root[data-theme="night"] {
  --ground: #111917; --tint: #1B2A25; --hair: #26312D;
  --ink: #E4EAE6; --ink-hover: #F6FAF7; --muted: #8FA098; --faint: #4E5C56;
  --accent: #5FD3A8; --on-accent: #0C1310;
  --ok: #5FD3A8; --ok-tint: #17352A; --bad: #E08A7E; --bad-tint: #3A1F1B; --warn: #E2B85C; --warn-tint: #2E2612;
  color-scheme: dark;
}
:root[data-theme="night"] .rail button.primary { background: var(--accent); color: var(--on-accent); }
:root[data-theme="night"] .rail button.primary:hover { background: #7BE0BB; }
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--ground); color: var(--ink); font: 17px/1.5 var(--sans); -webkit-text-size-adjust: 100%; }
[hidden] { display: none !important; }   /* wins over every display rule, incl. #exam grid and .account inline-flex */
h1 { font: 500 30px/1.1 var(--display); letter-spacing: -0.01em; margin: 0; }
h2 { font: 500 22px/1.2 var(--display); margin: 32px 0 12px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }
.mono, .num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

button { font: inherit; color: var(--ink); background: none; border: 1px solid var(--hair); border-radius: 6px; padding: 10px 14px; min-height: 44px; cursor: pointer; }
button:disabled { color: var(--faint); border-color: var(--hair); cursor: default; }
button.primary { background: var(--ink); border-color: var(--ink); color: var(--ground); font-weight: 600; border-radius: 10px; }
button.primary:hover { background: var(--ink-hover); }
button.line { border-color: var(--ink); font-weight: 600; border-radius: 10px; }
button.submit { background: var(--accent); border-color: var(--accent); color: var(--on-accent); font-weight: 600; border-radius: 10px; }
button.big { width: 100%; min-height: 56px; font-size: 17px; }
button.link { border: none; padding: 4px 8px; text-decoration: underline; text-underline-offset: 3px; }

.wrap { max-width: 640px; margin: 0 auto; padding: 16px; }
.strip { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 14px 16px 10px; border-bottom: 1px solid var(--hair); background: var(--ground); position: sticky; top: 0; z-index: 2; }
.wordmark { font: 500 15px/1 var(--display); letter-spacing: 0.02em; }
.banner { background: var(--warn-tint); color: var(--warn); padding: 10px 16px; text-align: center; border-bottom: 1px solid var(--hair); font-size: 15px; }
.facts { list-style: none; padding: 0; margin: 20px 0 0; border-top: 1px solid var(--hair); }
.facts li { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--hair); font-size: 16px; }
.facts li b { font: 500 16px var(--mono); font-variant-numeric: tabular-nums; }
.start-title { margin: 6px 0 8px; }
.start-title.flash { color: var(--accent); transition: color 600ms ease-out; }
#paper-kicker { display: block; margin-top: 24px; }
#mock-info { margin-top: 20px; }
.start-actions { margin-top: 24px; }
.start-actions button + button { margin-top: 8px; }
#history { margin-top: 40px; }
.strip .account { border: 0; padding: 4px 6px; min-height: 36px; color: var(--ink); font: 600 15px var(--sans); display: inline-flex; align-items: center; gap: 4px; border-radius: 6px; }
.strip .account svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; transition: transform 150ms ease-out; }
.strip .account[aria-expanded="true"] svg { transform: rotate(180deg); }
.strip .account:hover { background: var(--tint); }
.panel { border-bottom: 1px solid var(--hair); background: var(--tint); }
.panel .wrap { padding-top: 12px; padding-bottom: 16px; }
.panel p { margin: 0 0 8px; }
.fine { font-size: 13px; color: var(--muted); margin: 10px 0 0; }

/* attempts list */
.attempt { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--hair); }
.attempt .when { font: 400 15px var(--mono); font-variant-numeric: tabular-nums; }
.attempt .sc { font: 500 15px var(--mono); font-variant-numeric: tabular-nums; margin-left: 8px; }
.attempt button { min-height: 40px; }

/* ---------------------------------------------------------------- exam */
#exam { height: 100dvh; display: grid; grid-template-rows: auto auto auto minmax(0, 1fr); }
#exam .strip { position: static; }
.timer { font: 500 22px/1 var(--mono); font-variant-numeric: tabular-nums; }
.timer.low { color: var(--accent); }
.timer-wrap { display: inline-flex; flex-direction: column; align-items: flex-end; gap: 3px; }
.timer-label { font: 400 11px/1 var(--mono); color: var(--muted); }
.progress { height: 3px; background: var(--hair); }
.progress i { display: block; height: 100%; width: 0; background: var(--accent); transition: width 200ms ease-out; }
.saved { font: 400 12px/1 var(--mono); color: var(--muted); opacity: 0; transition: opacity 300ms ease-out; margin-left: 6px; }
.saved.show { opacity: 1; }
.saved.ok { color: var(--accent); }
.net { font: 400 12px var(--mono); color: var(--muted); }
.exam-main { grid-row: 4; display: grid; grid-template-columns: minmax(0, 1fr) var(--rail); min-height: 0; width: 100%; max-width: calc(640px + var(--rail)); margin: 0 auto; }
.exam-content { overflow-y: auto; padding: 14px 12px 32px 16px; -webkit-overflow-scrolling: touch; }
.qhead { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; }
.qno { font: 500 13px/1 var(--mono); color: var(--muted); }
.tag { font: 500 12px/1 var(--mono); color: var(--accent); }
.qbody { transition: opacity 150ms ease-out; }
.qbody.fade { opacity: 0; }
.stem { white-space: pre-wrap; margin: 0 0 12px; }
.imgnote { color: var(--warn); font-size: 14px; margin: 0 0 12px; }
.options { margin: 0 -12px 0 -16px; border-top: 1px solid var(--hair); }
.opt { display: flex; gap: 12px; align-items: flex-start; text-align: left; width: 100%; padding: 11px 12px 11px 16px; min-height: 50px; border: 0; border-bottom: 1px solid var(--hair); border-radius: 0; background: none; font-size: 16px; white-space: pre-wrap; position: relative; }
.opt:hover { background: color-mix(in srgb, var(--tint) 50%, transparent); }
.opt:focus-visible { outline-offset: -2px; }
.opt b { flex: 0 0 22px; width: 22px; height: 22px; border-radius: 50%; border: 1.5px solid var(--muted); margin-top: 2px; position: relative; font-size: 0; transition: background 120ms ease-out, border-color 120ms ease-out; }
.opt.selected { background: var(--tint); font-weight: 600; }
.opt.selected::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--accent); }
.opt.selected b { border-color: var(--accent); background: var(--accent); }
.opt.selected b::after { content: ""; position: absolute; inset: 6px; border-radius: 50%; background: var(--ground); }

.rail { border-left: 1px solid var(--hair); display: grid; grid-template-rows: 48px 48px 48px minmax(0, 1fr) auto; gap: 6px; padding: 8px 6px calc(14px + env(safe-area-inset-bottom)); }
.rail button { display: grid; place-items: center; gap: 3px; padding: 6px 0; border: 0; border-radius: 8px; min-height: 48px; font: 600 11.5px/1 var(--sans); letter-spacing: 0.01em; text-align: center; }
.rail button.on svg { fill: currentColor; }
.rail button svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.rail button:hover:not(:disabled) { background: var(--tint); }
.rail button.on { color: var(--accent); }
.rail button.primary { height: 96px; border-radius: 10px; color: var(--ground); }
.rail button.primary:hover { background: var(--ink-hover); }
.rail button.primary svg { width: 22px; height: 22px; }
.rail .theme { align-self: end; color: var(--muted); min-height: 44px; }
.strip .theme { border: 0; padding: 4px 8px; min-height: 36px; color: var(--muted); font: 500 13px var(--mono); display: inline-flex; align-items: center; gap: 6px; }
.strip .theme svg, .rail .theme svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.strip-right { display: flex; align-items: center; gap: 8px; }
.strip-left { display: flex; align-items: baseline; gap: 10px; }
.strip .exit { color: var(--muted); font-size: 14px; min-height: 36px; }

.palhead { display: flex; justify-content: space-between; align-items: baseline; font: 400 12px/1.3 var(--mono); color: var(--muted); margin: 20px 0 8px; }
.palette { display: grid; grid-template-columns: repeat(6, 1fr); gap: 5px; }
.pal { min-height: 44px; padding: 0; display: grid; place-items: center; font: 500 15px/1 var(--mono); font-variant-numeric: tabular-nums; border: 1.5px solid transparent; border-radius: 6px; color: var(--faint); }
.pal.unanswered { border-color: var(--muted); color: var(--ink); }
.pal.answered { background: var(--ink); border-color: var(--ink); color: var(--ground); }
.pal.marked { border-color: var(--accent); border-width: 2px; color: var(--accent); }
.pal.marked.answered { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.pal.current { outline: 2px solid var(--ink); outline-offset: 1px; }
.legend { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 12px; font-size: 13px; color: var(--muted); margin-top: 14px; }
.sw { display: inline-block; width: 16px; height: 16px; border-radius: 4px; border: 1.5px solid var(--hair); margin-right: 6px; vertical-align: -3px; }
.sw.answered { background: var(--ink); border-color: var(--ink); }
.sw.unanswered { border-color: var(--muted); }
.sw.marked { border-color: var(--accent); border-width: 2px; }
#btn-submit { width: 100%; margin-top: 20px; }

@media (min-width: 640px) {
  :root { --rail: 96px; }
  .rail button { font-size: 12.5px; }
  .palette { grid-template-columns: repeat(9, 1fr); }
  .exam-content { padding-left: 24px; padding-right: 20px; }
  .options { margin: 0 -20px 0 -24px; }
  .opt { padding-left: 24px; }
}
/* wide screens: the palette becomes a column to the right of the question, still left of the rail */
@media (min-width: 900px) {
  .exam-main { max-width: calc(640px + 300px + var(--rail)); }
  .exam-content { display: grid; grid-template-columns: minmax(0, 1fr) 276px; column-gap: 24px; align-content: start; }
  .exam-content > .qhead, .exam-content > .qbody { grid-column: 1; }
  .exam-content > .palette-wrap { grid-column: 2; grid-row: 1 / span 2; position: sticky; top: 0; align-self: start; padding-left: 24px; border-left: 1px solid var(--hair); }
  .palette-wrap .palhead { margin-top: 0; }
  .palette { grid-template-columns: repeat(6, 1fr); }
}

/* ---------------------------------------------------------------- report */
.score { display: flex; align-items: baseline; gap: 8px; margin: 4px 0 0; }
.score b { font: 500 52px/1 var(--mono); letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.score span { font: 400 18px var(--mono); color: var(--muted); }
.kpis { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--hair); border-bottom: 1px solid var(--hair); margin: 16px 0 12px; }
.kpis div { padding: 10px 8px 10px 0; font-size: 12px; line-height: 1.3; color: var(--muted); border-right: 1px solid var(--hair); }
.kpis div + div { padding-left: 8px; }
.kpis div:last-child { border-right: 0; }
.kpis b { display: block; font: 500 20px/1.2 var(--mono); color: var(--ink); font-variant-numeric: tabular-nums; }
.note { color: var(--muted); font-size: 15px; }
.verdict-line { font-size: 16px; margin: 12px 0 0; }
.h2-sub { font: 400 13px var(--mono); margin-left: 8px; }
.lost { display: grid; gap: 10px; margin-bottom: 20px; }
.lost .row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 12px; align-items: baseline; }
.lost .row b { font: 500 15px var(--mono); font-variant-numeric: tabular-nums; }
.lost .bar { grid-column: 1 / -1; height: 6px; background: var(--tint); border-radius: 3px; overflow: hidden; }
.lost .bar i { display: block; height: 100%; background: var(--bad); border-radius: 3px; }
.lost .why { grid-column: 1 / -1; font: 400 12px var(--mono); color: var(--muted); }
.subjects td.acc { min-width: 96px; }
.acc-bar { display: inline-block; vertical-align: middle; width: 44px; height: 6px; background: var(--tint); border-radius: 3px; margin-right: 6px; overflow: hidden; }
.acc-bar i { display: block; height: 100%; background: var(--ok); border-radius: 3px; }
.scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; min-width: 480px; border-collapse: collapse; font-size: 14px; }
th, td { padding: 8px 6px; text-align: right; border-bottom: 1px solid var(--hair); font-family: var(--mono); font-variant-numeric: tabular-nums; }
th:first-child, td:first-child { text-align: left; font-family: var(--sans); font-size: 15px; }
thead th { font: 500 12px var(--mono); color: var(--muted); border-bottom: 1px solid var(--ink); }
.filters { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin: 0 -16px 12px; padding: 8px 16px; position: sticky; top: 55px; z-index: 1; background: var(--ground); }
.filters button { min-height: 44px; padding: 8px 10px; font: 500 14px var(--mono); border-radius: 10px; }
.filters button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--ground); }
@media (min-width: 640px) { .filters { grid-template-columns: repeat(4, 1fr); } }
.ritem { border-top: 1px solid var(--hair); padding: 12px 0 4px; }
.ritem .rsum { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2px 12px; align-items: center; cursor: pointer; }
.ritem .rsum .stem { grid-column: 1 / -1; }
.ritem .rsum .ans { font: 400 13px var(--mono); color: var(--muted); white-space: nowrap; }
.ritem .rsum .ans b { font-weight: 500; color: var(--ink); }
.ritem .stem.clamp { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 6px; }
.ritem .rbody { display: none; }
.ritem.open .rbody { display: block; }
.ritem.open .stem.clamp { display: block; -webkit-line-clamp: unset; }
.ritem .rsum::after { content: "▾"; color: var(--muted); font-size: 12px; justify-self: end; transition: transform 150ms ease-out; }
.ritem.open .rsum::after { transform: rotate(180deg); }
.flagbox { margin-top: 8px; display: grid; gap: 6px; }
.flagbox textarea { font: inherit; font-size: 15px; color: var(--ink); background: var(--ground); border: 1px solid var(--hair); border-radius: 6px; padding: 8px 10px; min-height: 64px; resize: vertical; }
.flagbox .fb-actions { display: flex; gap: 6px; justify-content: flex-end; }
.ritem .rh { display: flex; justify-content: space-between; gap: 8px; font: 400 12px/1.4 var(--mono); color: var(--muted); margin-bottom: 6px; flex-wrap: wrap; }
.ritem .stem { font-size: 16px; }
.ritem .ropt { padding: 8px 10px; border-radius: 6px; margin: 6px 0; white-space: pre-wrap; font-size: 15px; }
.ritem .ropt.key { background: var(--ok-tint); }
.ritem .ropt.chosen.wrong { background: var(--bad-tint); }
.verdict { font-weight: 500; } .verdict.ok { color: var(--ok); } .verdict.bad { color: var(--bad); } .verdict.none { color: var(--muted); }
details { margin-top: 8px; font-size: 15px; } summary { cursor: pointer; color: var(--accent); }
.expl { white-space: pre-wrap; margin-top: 6px; }
.rfoot { display: flex; justify-content: flex-end; margin-top: 4px; } .rfoot button { font-size: 13px; min-height: 40px; padding: 6px 10px; }
.sheet { position: fixed; inset: 0; z-index: 4; background: color-mix(in srgb, var(--ink) 55%, transparent); display: grid; align-items: end; }
.sheet-body { background: var(--ground); border-top: 1px solid var(--hair); border-radius: 16px 16px 0 0; padding: 20px 20px calc(20px + env(safe-area-inset-bottom)); max-width: 640px; width: 100%; margin: 0 auto; }
.sheet-body h2 { margin: 4px 0 12px; }
.tips { margin: 0 0 16px; padding: 0 0 0 18px; font-size: 16px; }
.tips li { margin: 6px 0; }
.check { display: flex; align-items: center; gap: 8px; font-size: 15px; color: var(--muted); margin-bottom: 14px; min-height: 44px; }
.check input { width: 20px; height: 20px; accent-color: var(--accent); }
@media (min-width: 640px) { .sheet { align-items: center; } .sheet-body { border-radius: 16px; border: 1px solid var(--hair); } }
.toast { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); background: var(--ink); color: var(--ground); padding: 10px 16px; border-radius: 10px; z-index: 5; max-width: 90vw; font-size: 15px; }

@media (prefers-reduced-motion: reduce) { .qbody, .opt b { transition: none; } }