/**
 * QuizMatsuri — shared quiz page styles
 * ------------------------------------------------
 * Place this file next to Bootstrap, e.g. /css/quiz.css
 * and load it after Bootstrap + Bootstrap Icons:
 *
 *   <link href="../css/bootstrap.min.css" rel="stylesheet" />
 *   <link href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css" rel="stylesheet" />
 *   <link href="../css/quiz.css" rel="stylesheet" />
 *
 * Image assets are resolved relative to this stylesheet
 * (expected site layout: /css, /img, /js).
 * Language-specific copy stays in each quiz.html; this file
 * only covers the visual system shared across locales.
 */

/* ==========================================================================
   Design tokens
   ========================================================================== */

:root {
  --qm-primary: #1d60a8;
  --qm-primary-hover: #164a83;
  --qm-primary-soft: #ebf5ff;
  --qm-accent-red: #d9383a;
  --qm-accent-red-soft: rgba(217, 56, 58, 0.08);

  --qm-success: #10b981;
  --qm-success-soft: #ecfdf5;
  --qm-danger: #ef4444;
  --qm-danger-soft: #fef2f2;
  --qm-warning: #f59e0b;
  --qm-hint-border: #facc15;
  --qm-hint-text: #713f12;
  --qm-hint-muted: #57534e;

  --qm-bg: #f4f7fb;
  --qm-surface: #ffffff;
  --qm-card-bg: #fffbf2;
  --qm-header-bg: #fffdf6;
  --qm-footer-bg: #f8f4ea;
  --qm-footer-border: #ebd2bd;

  --qm-text: #2c3e50;
  --qm-text-heading: #1a2530;
  --qm-text-muted: #64748b;
  --qm-text-body: #1e293b;
  --qm-text-option: #475569;

  --qm-border: #e2e8f0;
  --qm-border-strong: #cbd5e1;
  --qm-border-question: #dbeafe;
  --qm-option-hover-border: #93c5fd;
  --qm-option-hover-bg: #f8fafc;
  --qm-letter-bg: #f1f5f9;

  --qm-shadow-card: 0 4px 16px rgba(29, 96, 168, 0.06);
  --qm-shadow-btn: 0 4px 12px rgba(29, 96, 168, 0.25);
  --qm-shadow-logo: 0 3px 8px rgba(217, 56, 58, 0.35);
  --qm-shadow-hint: 0 3px 10px rgba(202, 138, 4, 0.12);

  --qm-radius-sm: 8px;
  --qm-radius-md: 12px;
  --qm-radius-lg: 16px;
  --qm-radius-pill: 25px;

  --qm-font: "Noto Sans TC", "Noto Sans JP", sans-serif;
  --qm-font-jp: "Noto Sans JP", "Noto Sans TC", sans-serif;

  --qm-header-overlay: rgba(255, 253, 246, 0.28);
  --qm-question-gradient: linear-gradient(135deg, #f0f7ff 0%, #fffbf8 100%);
  --qm-hint-gradient: linear-gradient(135deg, #fffbeb, #fff7d6);

  --qm-bg-image: url("../img/bg.png");
  --qm-header-image: url("../img/header_bg.png");
  --qm-footer-wave-image: url("../img/footer_wave_pattern.png");
}

/* ==========================================================================
   Base
   ========================================================================== */

body {
  font-family: var(--qm-font);
  color: var(--qm-text);
  background-color: var(--qm-bg);
  background-image:
    radial-gradient(
      circle at 10% 20%,
      rgba(217, 56, 58, 0.03) 0%,
      transparent 20%
    ),
    radial-gradient(
      circle at 90% 80%,
      rgba(29, 96, 168, 0.03) 0%,
      transparent 20%
    ),
    var(--qm-bg-image);
  background-position:
    10% 20%,
    90% 80%,
    center;
  background-repeat: repeat;
  background-size: 24%, contain;
}

/* Extra type scale used across quiz pages (Bootstrap stops at fs-6) */
.fs-7 {
  font-size: 0.875rem;
}

.fs-8 {
  font-size: 0.75rem;
}

/* ==========================================================================
   Header
   ========================================================================== */

.header-navbar {
  background-color: var(--qm-header-bg);
  background-image:
    linear-gradient(var(--qm-header-overlay), var(--qm-header-overlay)),
    var(--qm-header-image);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--qm-border);
}

.logo-badge {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--qm-surface);
  border-radius: 50%;
  background-color: var(--qm-accent-red);
  color: var(--qm-surface);
  font-size: 1.4rem;
  font-weight: 700;
  box-shadow: var(--qm-shadow-logo);
}

.logo-title {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.5px;
  color: var(--qm-text-heading);
}

.logo-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--qm-text-muted);
}

@keyframes logoPulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(217, 56, 58, 0.4);
  }
  50% {
    transform: scale(1.03);
    box-shadow: 0 0 0 8px rgba(217, 56, 58, 0);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(217, 56, 58, 0);
  }
}

.logo-highlight {
  padding: 4px;
  border-radius: var(--qm-radius-md);
  background-color: var(--qm-accent-red-soft);
  animation: logoPulse 1.8s infinite;
}

/* ==========================================================================
   Layout cards
   ========================================================================== */

.qm-card {
  margin-bottom: 1.25rem;
  border: 1px solid var(--qm-border);
  border-radius: var(--qm-radius-lg);
  background: var(--qm-card-bg);
  box-shadow: var(--qm-shadow-card);
}

.question-wrapper {
  position: relative;
  overflow: hidden;
  padding: 1.5rem 1.5rem 0.5rem;
  border: 1px solid var(--qm-border-question);
  border-radius: var(--qm-radius-lg);
  background: var(--qm-question-gradient);
}

.japanese-word {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--qm-text-body);
}

/* ==========================================================================
   Answer options
   ========================================================================== */

.option-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  border: 2px solid var(--qm-border);
  border-radius: var(--qm-radius-md);
  background-color: var(--qm-surface);
  cursor: pointer;
  user-select: none;
  transition:
    border-color 0.2s ease,
    background-color 0.2s ease,
    transform 0.2s ease;
}

.option-card:hover {
  border-color: var(--qm-option-hover-border);
  background-color: var(--qm-option-hover-bg);
  transform: translateY(-1px);
}

.option-letter {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 1rem;
  border-radius: var(--qm-radius-sm);
  background-color: var(--qm-letter-bg);
  color: var(--qm-text-option);
  font-size: 0.9rem;
  font-weight: 700;
}

.option-card.selected {
  border-color: var(--qm-primary);
  background-color: var(--qm-primary-soft);
}

.option-card.correct {
  border-color: var(--qm-success);
  background-color: var(--qm-success-soft);
}

.option-card.correct .option-letter {
  background-color: var(--qm-success);
  color: var(--qm-surface);
}

.option-card.incorrect {
  border-color: var(--qm-danger);
  background-color: var(--qm-danger-soft);
}

.option-card.incorrect .option-letter {
  background-color: var(--qm-danger);
  color: var(--qm-surface);
}

.kana-answer-input {
  font-family: var(--qm-font-jp);
  font-size: 1.15rem;
  letter-spacing: 0.08em;
}

/* ==========================================================================
   Feedback banner
   ========================================================================== */

.feedback-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border: 1px solid #a8dab5;
  border-radius: var(--qm-radius-md);
  background-color: #e6f4ea;
}

/* ==========================================================================
   Progress donut
   ========================================================================== */

.progress-radial {
  position: relative;
  width: 110px;
  height: 110px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  border-radius: 50%;
  background: conic-gradient(
    var(--qm-primary) calc(var(--percentage, 0) * 1%),
    var(--qm-border) 0
  );
}

.progress-radial::before {
  content: "";
  position: absolute;
  width: 86px;
  height: 86px;
  border-radius: 50%;
  background-color: var(--qm-surface);
}

.progress-radial-text {
  position: relative;
  z-index: 1;
  text-align: center;
}

/* ==========================================================================
   History
   ========================================================================== */

.history-item-badge {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn-qm-primary {
  padding: 0.6rem 2rem;
  border-color: var(--qm-primary);
  border-radius: var(--qm-radius-pill);
  background-color: var(--qm-primary);
  color: var(--qm-surface);
  font-weight: 600;
  box-shadow: var(--qm-shadow-btn);
}

.btn-qm-primary:hover,
.btn-qm-primary:focus-visible {
  border-color: var(--qm-primary-hover);
  background-color: var(--qm-primary-hover);
  color: var(--qm-surface);
}

/* ==========================================================================
   Collapsible hint
   ========================================================================== */

.hint-panel {
  overflow: hidden;
  border: 1px solid var(--qm-hint-border);
  border-radius: var(--qm-radius-md);
  background: var(--qm-hint-gradient);
  box-shadow: var(--qm-shadow-hint);
}

.hint-toggle {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.85rem 1rem;
  border: 0;
  background: transparent;
  color: var(--qm-hint-text);
  text-align: left;
  cursor: pointer;
}

.hint-toggle:hover,
.hint-toggle:focus-visible {
  background-color: rgba(254, 243, 199, 0.9);
  outline: none;
}

.hint-toggle:focus-visible {
  box-shadow: inset 0 0 0 3px rgba(202, 138, 4, 0.35);
}

.hint-icon {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background-color: var(--qm-warning);
  color: var(--qm-surface);
}

.hint-chevron {
  margin-left: auto;
  transition: transform 0.2s ease;
}

.hint-toggle.is-expanded .hint-chevron {
  transform: rotate(180deg);
}

.hint-content {
  padding: 0.8rem 1rem 0.95rem;
  border-top: 1px dashed var(--qm-hint-border);
  color: var(--qm-hint-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  position: relative;
  border-top: 1px solid var(--qm-footer-border);
  background-color: var(--qm-footer-bg);
}

.footer-wave-container {
  width: 100%;
  height: 60px;
  background-image: var(--qm-footer-wave-image);
  background-repeat: repeat-x;
  background-position: bottom center;
  background-size: auto 60px;
}