@font-face { font-family: "DM Sans"; src: url("./fonts/DMSans-Variable.ttf") format("truetype"); font-style: normal; font-weight: 100 1000; font-display: swap; }
:root {
  --bg: #fafafa;
  --text: #1a1a1a;
  --card: #ffffff;
  --border: #ddd;
  --correct: #1a7f37;
  --incorrect: #cf222e;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.layout {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  min-height: 100vh;
  padding: 24px;
}

.app {
  width: 100%;
  max-width: 420px;
}

.screen[hidden] { display: none; }

.known-learners {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.known-learners[hidden] { display: none; }

.continue-btn {
  background: var(--card);
  color: var(--text);
}

#name-form {
  display: flex;
  gap: 8px;
}

#name-input {
  min-width: 0;
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
}

#name-input:focus {
  outline: 2px solid var(--correct);
  outline-offset: 2px;
}

button {
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  background: var(--text);
  color: var(--card);
  font-size: 16px;
  cursor: pointer;
}

button:focus-visible {
  outline: 2px solid var(--correct);
  outline-offset: 2px;
}

button:hover {
  opacity: 0.85;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.swatch {
  height: 180px;
  border-radius: 16px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
}

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

.choice-btn {
  padding: 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 15px;
  text-transform: capitalize;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.choice-btn.correct { background: var(--correct); color: white; }
.choice-btn.incorrect { background: var(--incorrect); color: white; }

.feedback { text-align: center; font-weight: 600; margin-top: 14px; }
.stats { text-align: center; color: #555; margin-top: 10px; font-size: 14px; }
.error { color: var(--incorrect); }

.spectrum[hidden] { display: none; }

#spectrum-canvas {
  width: 28px;
  height: 70vh;
  border-radius: 14px;
  border: 1px solid var(--border);
  image-rendering: auto;
}

@media (max-width: 720px) {
  .layout {
    flex-direction: column;
  }

  #spectrum-canvas {
    width: 90vw;
    height: 28px;
  }
}

h1 { font-size: clamp(48px, 6vw, 96px); line-height: 1.05; margin: 24px 0 16px; letter-spacing: -0.03em; }
p { font-family: "DM Sans", sans-serif; line-height: 1.5; letter-spacing: -0.04em; }
.intro { font-size: 20px; margin: 0 0 24px; }
.app-bar, .dialog-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.app-bar { font-size: 13px; margin-bottom: 24px; flex-wrap: wrap; }
.app-bar > div { display: flex; flex-wrap: wrap; gap: 4px; }
.quiet { background: transparent; color: var(--text); border: 1px solid var(--border); font-size: 13px; padding: 8px 10px; }
label { display: block; margin-bottom: 8px; }
.small, .save-status, .keyboard-tip { font-size: 13px; color: #555; }
.save-status { margin-top: 24px; }
.keyboard-tip { text-align: center; }
.question-heading { font-size: 20px; margin: 0 0 16px; }
.notice { border: 1px solid var(--border); border-radius: 10px; background: var(--card); padding: 12px; }
details { margin-top: 24px; }
summary { cursor: pointer; font-size: 14px; }
dialog { background: var(--bg); color: var(--text); width: min(620px, calc(100vw - 24px)); max-height: calc(100dvh - 24px); padding: 24px; border: 1px solid var(--border); border-radius: 16px; overflow-y: auto; }
dialog::backdrop { background: rgb(0 0 0 / 45%); }
dialog h2 { font-size: 22px; margin: 0; min-width: 0; overflow-wrap: anywhere; }
dialog button { max-width: 100%; white-space: normal; overflow-wrap: anywhere; }
dialog h3 { margin-top: 28px; }
.settings-actions, #cloud-panel > div { display: flex; flex-wrap: wrap; gap: 10px; }
#cloud-panel p, #cloud-panel form { flex-basis: 100%; margin: 4px 0 8px; }
#cloud-panel a { color: var(--text); margin-top: 8px; overflow-wrap: anywhere; }
.cloud-status { font-size: 14px; }
.offline-notices { max-width: 700px; margin: 24px auto; padding: 16px; }
.offline-notices pre { white-space: pre-wrap; font-size: 12px; overflow-wrap: anywhere; }
.file-label { display: block; min-width: 0; max-width: 100%; border: 1px solid var(--border); padding: 10px; border-radius: 8px; }
.file-label input { display: block; max-width: 100%; font-size: 13px; margin-top: 6px; }
.settings-form { display: flex; flex-direction: column; gap: 8px; }
.settings-form input { padding: 12px; font-size: 16px; border: 1px solid var(--border); border-radius: 8px; }
@media (max-width: 400px) { .layout { padding: 20px 16px; } dialog { padding: 18px; } #spectrum-canvas { width: calc(100vw - 32px); } }