/* src/pages/app/app.css */
:root {
  --desk: #9aa3b0;
  --desk-deep: #87909d;
  --paper: #f3efe4;
  --paper-edge: #e4ddd0;
  --ink: #182231;
  --mute: #5d6774;
  --print: #1a4f9c;
  --print-press: #143c78;
  --print-wash: #d7e3f4;
  --grid: #b7cae3;
  --stamp: #c43c2c;
  --bad: #9a2f24;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --font-display: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-ui: "Jost", system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --radius: 2px;
  --buncss-light: initial;
  --buncss-dark: ;
  color-scheme: light;
}

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

html, body {
  background: var(--desk);
  color: var(--ink);
  font-family: var(--font-ui);
  -webkit-text-size-adjust: 100%;
  min-height: 100%;
  margin: 0;
}

body {
  background: radial-gradient(120% 80% at 50% 0%, color-mix(in srgb, var(--desk) 70%, white) 0%, transparent 55%), linear-gradient(180deg, var(--desk) 0%, var(--desk-deep) 100%);
  min-height: 100dvh;
}

button, input {
  font: inherit;
}

.shell {
  display: grid;
  padding: 18px 14px calc(18px + var(--safe-bottom));
  place-items:  center;
  min-height: 100dvh;
}

.sheet {
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  display: grid;
  grid-template-rows: auto 1fr auto;
  position: relative;
  overflow: hidden;
  width: min(100%, 420px);
  min-height: min(86dvh, 760px);
}

.sheet:before {
  content: "";
  position: absolute;
  background: repeating-linear-gradient(180deg, transparent 0 14px, var(--print) 14px 16px, transparent 16px 30px);
  opacity: .7;
  pointer-events: none;
  width: 8px;
  top: 72px;
  bottom: 72px;
  left: 0;
}

.mast {
  border-bottom: 2px solid var(--print);
  display: grid;
  gap: 10px;
  padding: 18px 18px 12px 22px;
}

.mast-row {
  display: flex;
  justify-content: space-between;
  align-items:  flex-end;
  gap: 12px;
}

.brand {
  display: grid;
  gap: 2px;
}

.brand h1 {
  font-family: var(--font-display);
  letter-spacing: .08em;
  color: var(--print);
  margin: 0;
  font-size: clamp(2rem, 9vw, 2.6rem);
  font-weight: 600;
  line-height: 1;
}

.brand p {
  color: var(--mute);
  max-width: 28ch;
  margin: 0;
  font-size: .92rem;
  line-height: 1.45;
}

.meta {
  letter-spacing: .08em;
  color: var(--print);
  border: 1.5px solid var(--print);
  white-space: nowrap;
  align-self:  start;
  padding: 6px 8px;
  font-size: .75rem;
}

.boxes {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 3px;
}

.boxes span {
  aspect-ratio: 1;
  border: 1.5px solid var(--print);
  background: color-mix(in srgb, var(--paper) 86%, white);
}

.stage {
  position: relative;
  display: grid;
  align-content:  start;
  gap: 12px;
  min-height: 0;
  padding: 14px 16px 8px 22px;
}

.hint {
  color: var(--mute);
  margin: 0;
  font-size: .95rem;
  line-height: 1.5;
}

.frame {
  position: relative;
  border: 1.5px solid var(--print);
  display: grid;
  overflow: hidden;
  background: #fff;
  place-items:  center;
  height: 100%;
  min-height: max(42vh, 280px);
}

.frame.empty {
  background-color: #fffdf8;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-position: -1px -1px;
  background-size: 20px 26px;
}

.frame.empty:after {
  content: "答题区";
  font-family: var(--font-display);
  letter-spacing: .35em;
  color: color-mix(in srgb, var(--print) 45%, white);
  font-size: .95rem;
}

.frame img, .frame .compare {
  object-fit: contain;
  display: block;
  background: #fff;
  width: 100%;
  height: 100%;
  min-height: 46vh;
}

.compare {
  position: relative;
  overflow: hidden;
  touch-action: none;
  cursor: ew-resize;
  user-select: none;
}

.compare .after, .compare .before {
  position: absolute;
  background: #fff center / contain no-repeat;
  inset: 0;
}

.compare .before {
  clip-path: inset(0 0 0 var(--split, 52%));
}

.compare .rail {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--split, 52%);
  background: var(--print);
  pointer-events: none;
  width: 2px;
  transform: translateX(-1px);
}

.compare .knob {
  position: absolute;
  top: 50%;
  left: var(--split, 52%);
  border: 2px solid var(--print);
  background: var(--paper);
  pointer-events: none;
  display: grid;
  color: var(--print);
  letter-spacing: .04em;
  border-radius: 50%;
  place-items:  center;
  width: 34px;
  height: 34px;
  font-size: .7rem;
  font-weight: 500;
  transform: translate(-50%, -50%);
}

.stamp {
  position: absolute;
  border: 3px solid var(--stamp);
  color: var(--stamp);
  display: grid;
  font-family: var(--font-display);
  letter-spacing: .12em;
  background: color-mix(in srgb, var(--paper) 70%, transparent);
  pointer-events: none;
  border-radius: 50%;
  place-items:  center;
  width: 64px;
  height: 64px;
  font-size: 1.55rem;
  font-weight: 700;
  top: 18px;
  right: 18px;
  transform: rotate(-18deg);
}

.stamp.pulse {
  animation: 1.2s ease-in-out infinite stamp-in;
}

@keyframes stamp-in {
  0%, 100% {
    opacity: .45;
    transform: rotate(-18deg)scale(.96);
  }

  50% {
    opacity: 1;
    transform: rotate(-14deg)scale(1.02);
  }
}

@media (prefers-reduced-motion: reduce) {
  .stamp.pulse {
    animation: none;
  }
}

.status {
  display: grid;
  gap: 4px;
}

.status strong {
  font-family: var(--font-display);
  color: var(--print);
  font-size: 1.15rem;
  font-weight: 600;
}

.status p {
  color: var(--mute);
  margin: 0;
  font-size: .92rem;
  line-height: 1.45;
}

.status.error strong {
  color: var(--bad);
}

.check {
  display: flex;
  color: var(--mute);
  user-select: none;
  align-items:  center;
  gap: 10px;
  font-size: .92rem;
}

.check input {
  accent-color: var(--print);
  width: 18px;
  height: 18px;
}

.actions {
  border-top: 1px dashed color-mix(in srgb, var(--print) 55%, transparent);
  display: grid;
  background: color-mix(in srgb, var(--paper) 88%, var(--print-wash));
  gap: 10px;
  padding: 12px 16px 16px 22px;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.btn {
  appearance: none;
  border: 1.5px solid var(--print);
  color: var(--print);
  border-radius: var(--radius);
  letter-spacing: .04em;
  cursor: pointer;
  text-decoration: none;
  display: grid;
  background: none;
  place-items:  center;
  min-height: 52px;
  padding: 0 14px;
  font-weight: 500;
}

.btn.primary {
  background: var(--print);
  color: #f7f4ea;
}

.btn.primary:active {
  background: var(--print-press);
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: .4;
  cursor: not-allowed;
  transform: none;
}

.btn.ghost {
  border-style: dashed;
}

.hidden-input {
  display: none;
}

.compare-hint {
  text-align: center;
  color: var(--mute);
  letter-spacing: .06em;
  margin: 0;
  font-size: .82rem;
}