:root {
  color-scheme: light;
  --bg-top: #f6f4ec;
  --bg-bottom: #d8e8dc;
  --panel: rgba(255, 252, 247, 0.9);
  --panel-strong: #fffaf1;
  --text-main: #233127;
  --text-sub: #5b675f;
  --primary: #26667f;
  --primary-strong: #174f64;
  --accent: #de7c5a;
  --success: #2e7d32;
  --danger: #a03c3c;
  --border: rgba(35, 49, 39, 0.12);
  --shadow: 0 22px 55px rgba(38, 57, 46, 0.16);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --font-head: "Avenir Next", "Hiragino Sans", sans-serif;
  --font-body: "Avenir", "Hiragino Sans", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--text-main);
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.65), transparent 38%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

button,
input {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 20px 14px calc(24px + env(safe-area-inset-bottom));
}

.phone-frame {
  width: min(100%, 460px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero,
.status-card,
.card {
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero {
  padding: 24px 22px 20px;
}

.hero h1,
.card h2 {
  margin: 0;
  font-family: var(--font-head);
  letter-spacing: 0.01em;
}

.hero h1 {
  font-size: clamp(1.9rem, 5vw, 2.4rem);
  line-height: 1.05;
}

.hero-copy,
.section-copy,
.muted,
.review-box,
.example-box {
  color: var(--text-sub);
  line-height: 1.6;
}

.eyebrow,
.step-tag,
.status-label {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.74rem;
  color: var(--accent);
}

.status-card,
.quiz-topline {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.status-card {
  padding: 16px 18px;
}

.status-value {
  margin: 0;
  font-weight: 600;
}

body.quiz-active .phone-frame {
  gap: 10px;
}

body.quiz-active .hero {
  padding: 10px 14px;
  border-radius: 18px;
}

body.quiz-active .hero .eyebrow,
body.quiz-active .hero .hero-copy,
body.quiz-active .status-card .status-label {
  display: none;
}

body.quiz-active .hero h1 {
  font-size: 0.98rem;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

body.quiz-active .status-card {
  padding: 10px 14px;
  border-radius: 18px;
  align-items: center;
}

body.quiz-active .status-value {
  font-size: 0.84rem;
  line-height: 1.2;
}

.screen {
  display: none;
}

.screen.is-active {
  display: block;
}

.card {
  padding: 22px 18px 20px;
}

.file-picker {
  display: grid;
  gap: 10px;
  margin: 18px 0 10px;
  padding: 16px;
  border-radius: var(--radius-lg);
  background: rgba(255, 250, 241, 0.7);
  border: 1px dashed rgba(38, 102, 127, 0.34);
}

.file-picker input {
  width: 100%;
}

.mode-grid,
.choices,
.csv-list {
  display: grid;
  gap: 12px;
}

.choices {
  margin-top: 16px;
}

.csv-list {
  margin: 18px 0 10px;
}

.csv-btn {
  display: grid;
  gap: 4px;
}

.csv-btn strong {
  font-size: 0.98rem;
}

.csv-btn span {
  color: var(--text-sub);
  font-size: 0.88rem;
}

.choice-btn.is-selected {
  background: rgba(38, 102, 127, 0.12);
  border-color: rgba(38, 102, 127, 0.3);
  box-shadow: 0 8px 18px rgba(38, 102, 127, 0.08);
}

.primary-btn,
.secondary-btn,
.choice-btn {
  width: 100%;
  border: none;
  border-radius: var(--radius-md);
  padding: 15px 16px;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

.primary-btn,
.secondary-btn {
  margin-top: 16px;
}

.primary-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #fff;
  box-shadow: 0 14px 28px rgba(38, 102, 127, 0.24);
}

.secondary-btn,
.choice-btn {
  background: var(--panel-strong);
  color: var(--text-main);
  border: 1px solid rgba(38, 102, 127, 0.14);
}

.choice-btn {
  text-align: left;
}

.danger-btn {
  border-color: rgba(160, 60, 60, 0.2);
}

.primary-btn:disabled {
  opacity: 0.45;
  box-shadow: none;
}

.choice-btn.is-correct {
  background: rgba(46, 125, 50, 0.14);
  border-color: rgba(46, 125, 50, 0.28);
}

.choice-btn.is-wrong {
  background: rgba(160, 60, 60, 0.12);
  border-color: rgba(160, 60, 60, 0.26);
}

.feedback,
.review-box,
.example-box {
  margin-top: 14px;
  padding: 14px 15px;
  border-radius: var(--radius-md);
  background: rgba(255, 250, 241, 0.78);
}

.example-box {
  white-space: pre-line;
}

.feedback.is-correct {
  color: var(--success);
  background: rgba(46, 125, 50, 0.11);
}

.feedback.is-wrong {
  color: var(--danger);
  background: rgba(160, 60, 60, 0.11);
}

.result-score {
  margin: 14px 0 6px;
  font-size: 2.3rem;
  font-weight: 700;
}

.result-accuracy {
  margin: 0 0 16px;
  font-size: 1.1rem;
  color: var(--primary-strong);
}

@media (hover: hover) {
  .primary-btn:hover,
  .secondary-btn:hover,
  .choice-btn:hover {
    transform: translateY(-1px);
  }
}

@media (max-width: 420px) {
  .hero,
  .status-card,
  .card {
    border-radius: 24px;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  body.quiz-active .hero h1 {
    font-size: 0.92rem;
  }

  body.quiz-active .status-card {
    gap: 8px;
  }

  body.quiz-active .status-value {
    font-size: 0.78rem;
  }
}