:root {
  --bg: #090d1a;
  --bg-elevated: #eef5ff;
  --bg-elevated-hover: #dde9fa;
  /* Text sitting directly on the page background (--bg), e.g. outside any
     card - kept separate from --text since our cards are a light surface
     even in dark mode, so the two need opposite polarity. */
  --page-text: #f5f7fa;
  --text: #13213d;
  --text-muted: #5c6b85;
  --border: #c9d9ee;
  --accent: #c9900a;
  --accent-strong: #e0a91f;
  --accent-text: #1a1408;
  --danger: #c8392e;
  --danger-bg: #fbe4e1;
  --shadow: 0 20px 48px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
  --bg: #fbf6ea;
  --bg-elevated: #ffffff;
  --bg-elevated-hover: #f4ecd8;
  --page-text: #241f14;
  --text: #241f14;
  --text-muted: #6c6350;
  --border: #e5dcc4;
  --accent: #d99a00;
  --accent-strong: #b87f00;
  --accent-text: #1a1509;
  --danger: #c23f2b;
  --danger-bg: #fce9e4;
  --shadow: 0 12px 32px rgba(60, 50, 20, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--page-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.app {
  width: 100%;
  max-width: 640px;
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 36px;
  box-shadow: var(--shadow);
}

.screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
}

.screen[hidden] {
  display: none;
}

.logo {
  width: 160px;
  max-width: 60%;
  height: auto;
  margin-bottom: 4px;
}

h1 {
  margin: 0;
  font-size: 1.8rem;
  letter-spacing: -0.01em;
}

h2 {
  margin: 0;
  font-size: 1.3rem;
  line-height: 1.4;
  align-self: stretch;
  text-align: left;
}

.muted {
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

.small {
  font-size: 0.85rem;
}

.notice {
  width: 100%;
  text-align: left;
  background: var(--bg-elevated-hover);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 0.9rem;
  line-height: 1.5;
}

.btn {
  appearance: none;
  display: inline-block;
  border: none;
  border-radius: 12px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.08s ease, filter 0.15s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

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

.btn-accent:hover {
  filter: brightness(1.08);
}

.error {
  color: var(--danger);
  font-size: 0.9rem;
}

.field {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
}

.field label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.required {
  color: var(--danger);
}

.field input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elevated-hover);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}

.field input:focus {
  outline: none;
  border-color: var(--accent);
}

/* Question screen */
.progress-row {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.timer-label {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-weight: 700;
}

.timer-track {
  width: 100%;
  height: 6px;
  background: var(--bg-elevated-hover);
  border-radius: 999px;
  overflow: hidden;
}

.timer-bar {
  height: 100%;
  width: 100%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 1s linear;
}

.options-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-btn {
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-elevated-hover);
  color: var(--text);
  font-size: 0.98rem;
  cursor: pointer;
  transition: border-color 0.12s ease, background-color 0.12s ease, transform 0.08s ease;
}

.option-btn:hover {
  border-color: var(--accent);
}

.option-btn:active {
  transform: scale(0.99);
}

.option-btn:disabled {
  cursor: default;
}

.option-btn.selected {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 18%, var(--bg-elevated-hover));
}

/* All-questions-on-one-page mode */
.all-questions-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 26px;
  text-align: left;
}

.question-block {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
}

.question-block:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.question-block h3 {
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.4;
}

.question-number {
  color: var(--accent);
  font-weight: 700;
  margin-right: 6px;
}

/* Score / disqualified */
.alert-heading {
  color: var(--danger);
}

.cooldown-number {
  font-size: 5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

/* Theme toggle */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--accent);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  z-index: 10;
}

@media (max-width: 480px) {
  .app {
    padding: 28px 22px;
  }
}

@media (min-width: 860px) {
  body {
    padding: 48px;
  }

  .app {
    max-width: 760px;
    padding: 56px 64px;
    border-radius: 24px;
  }

  .logo {
    width: 200px;
  }

  h1 {
    font-size: 2.2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .option-btn {
    padding: 16px 20px;
    font-size: 1.05rem;
  }

  .cooldown-number {
    font-size: 7rem;
  }

  .question-block h3 {
    font-size: 1.15rem;
  }
}