@import url("https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Shrikhand&display=swap");

:root {
  --ink: #173a36;
  --paper: #f5eddb;
  --cream: #fffaf0;
  --orange: #f26430;
  --yellow: #f6c744;
  --teal: #1f8a7a;
  --red: #ce3b35;
  --line: rgba(23, 58, 54, 0.22);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: "DM Mono", monospace;
}

button, select { font: inherit; }
button { color: inherit; }

.paper-texture {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .35;
  background-image:
    repeating-linear-gradient(0deg, transparent 0 7px, rgba(23, 58, 54, .025) 8px),
    radial-gradient(circle at 20% 30%, rgba(242, 100, 48, .12) 0 1px, transparent 2px);
  background-size: auto, 18px 18px;
}

.app-shell {
  position: relative;
  width: min(1120px, calc(100% - 32px));
  margin: auto;
  padding: 42px 0 28px;
}

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 12px 0 20px;
  border-bottom: 3px solid var(--ink);
}

.eyebrow {
  margin: 0 0 5px;
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font: 400 clamp(3rem, 9vw, 6.8rem)/.78 "Shrikhand", serif;
  letter-spacing: -.035em;
  transform: rotate(-1deg);
}

h1 span {
  color: var(--orange);
  text-shadow: 3px 3px 0 var(--yellow);
}

.session-stats {
  display: flex;
  gap: 8px;
}

.session-stats div {
  min-width: 88px;
  padding: 10px 14px;
  text-align: center;
  border: 2px solid var(--ink);
  background: var(--cream);
  box-shadow: 3px 3px 0 var(--ink);
}

.session-stats strong,
.session-stats span { display: block; }
.session-stats strong { font: 400 1.6rem "Shrikhand", serif; }
.session-stats span { font-size: .64rem; text-transform: uppercase; }

.control-strip {
  display: flex;
  align-items: end;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px dashed var(--line);
}

label span {
  display: block;
  margin-bottom: 5px;
  font-size: .65rem;
  font-weight: 500;
  text-transform: uppercase;
}

select, .shuffle-button {
  min-height: 44px;
  padding: 10px 36px 10px 12px;
  color: var(--ink);
  border: 2px solid var(--ink);
  border-radius: 0;
  background: var(--cream);
  box-shadow: 2px 2px 0 var(--ink);
  cursor: pointer;
}

.shuffle-button {
  margin-left: auto;
  padding-right: 12px;
  background: var(--yellow);
  font-weight: 500;
}

.shuffle-button:active { transform: translate(2px, 2px); box-shadow: none; }

.game-area {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: clamp(24px, 6vw, 80px);
  padding: 46px 5% 38px;
}

.deck-panel {
  align-self: center;
  text-align: center;
}

.deck-illustration {
  position: relative;
  width: 130px;
  height: 160px;
  margin: 0 auto 22px;
}

.card-back {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--cream);
  border: 3px solid var(--ink);
  background: var(--teal);
  font: 400 2.4rem "Shrikhand", serif;
  box-shadow: 4px 4px 0 var(--ink);
}

.card-back::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 2px dashed rgba(255, 250, 240, .75);
}

.back-one { transform: rotate(-9deg) translate(-8px, 3px); background: var(--orange); }
.back-two { transform: rotate(5deg) translate(10px, 1px); background: var(--yellow); }

.deck-panel p {
  margin: 0 0 12px;
  font-weight: 500;
  font-size: .82rem;
}

.deck-panel small { font-size: .66rem; }

.progress-track {
  height: 10px;
  margin-bottom: 7px;
  overflow: hidden;
  border: 2px solid var(--ink);
  background: var(--cream);
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--orange);
  transition: width .25s ease;
}

.play-panel { text-align: center; }

.topic-label {
  display: inline-block;
  margin: 0 0 12px;
  padding: 5px 10px;
  color: var(--cream);
  background: var(--ink);
  font-size: .68rem;
  letter-spacing: .12em;
}

.flashcard {
  position: relative;
  width: min(100%, 620px);
  min-height: 350px;
  padding: 58px 52px;
  border: 3px solid var(--ink);
  background: var(--cream);
  box-shadow: 9px 9px 0 var(--ink);
  cursor: pointer;
  transition: transform .18s ease, background .18s ease;
}

.flashcard:hover { transform: translateY(-3px) rotate(.25deg); }
.flashcard.is-answer { background: #dcebdc; transform: rotate(-.5deg); }
.flashcard.is-flipping { animation: flip .28s ease; }

@keyframes flip {
  50% { transform: scaleX(.04); }
}

.card-side-label {
  position: absolute;
  top: 22px;
  left: 24px;
  color: var(--orange);
  font-size: .68rem;
  font-weight: 500;
  letter-spacing: .15em;
}

.card-copy {
  display: block;
  font: 400 clamp(1.5rem, 4vw, 2.55rem)/1.22 "Shrikhand", serif;
}

.tap-hint {
  position: absolute;
  bottom: 22px;
  left: 0;
  width: 100%;
  font-size: .66rem;
  opacity: .65;
}

.corner-mark { position: absolute; color: var(--orange); font-size: 1.2rem; }
.corner-mark.top { top: 18px; right: 22px; }
.corner-mark.bottom { bottom: 18px; left: 22px; transform: rotate(180deg); }

.rating-controls { margin-top: 24px; }
.rating-controls p { margin: 0 0 10px; font-size: .72rem; text-transform: uppercase; }
.rating-controls div { display: flex; justify-content: center; gap: 10px; }
.rating-controls button {
  padding: 9px 14px;
  border: 2px solid var(--ink);
  background: var(--cream);
  box-shadow: 2px 2px 0 var(--ink);
  cursor: pointer;
}
.rating-controls button:last-child { background: var(--yellow); }
.rating-controls button:hover { transform: translateY(-2px); }
.rating-controls button span { font-weight: 500; }
.reveal-prompt { margin: 20px 0 0; font-size: .7rem; opacity: .72; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-top: 16px;
  border-top: 3px solid var(--ink);
  font-size: .61rem;
  line-height: 1.6;
}
footer p { max-width: 560px; margin: 0; }
footer nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 12px; }
footer a { color: var(--ink); font-weight: 500; text-decoration-thickness: 2px; }

@media (max-width: 720px) {
  .app-shell { width: min(100% - 24px, 600px); padding-top: 66px; }
  .masthead { align-items: center; }
  .session-stats div { min-width: 67px; padding: 8px; }
  .control-strip { flex-wrap: wrap; }
  .control-strip label { flex: 1; }
  select { width: 100%; }
  .shuffle-button { width: 100%; margin-left: 0; }
  .game-area { display: block; padding: 30px 0; }
  .deck-panel { display: grid; grid-template-columns: 68px 1fr; column-gap: 18px; align-items: center; margin-bottom: 28px; text-align: left; }
  .deck-illustration { grid-row: span 3; width: 54px; height: 68px; margin: 0; }
  .card-back { font-size: 1.1rem; border-width: 2px; box-shadow: 2px 2px 0 var(--ink); }
  .card-back::after { inset: 4px; border-width: 1px; }
  .deck-panel p { margin: 0; }
  .progress-track { margin: 4px 0; }
  .flashcard { min-height: 310px; padding: 50px 28px; box-shadow: 6px 6px 0 var(--ink); }
  footer { display: block; }
  footer nav { justify-content: flex-start; margin-top: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}