/* style.css - Notion Design System Implementation based on Notion.md */

:root {
  /* Colors from Notion.md */
  --color-primary: #0075de;
  --color-primary-active: #005bab;
  --color-secondary: #213183;
  --color-on-primary: #ffffff;
  
  --color-canvas: #ffffff;
  --color-canvas-soft: #f6f5f4;
  --color-surface: #ffffff;
  
  --color-ink: #000000;
  --color-ink-secondary: #31302e;
  --color-ink-muted: #615d59;
  --color-ink-faint: #a39e98;
  --color-hairline: #e6e6e6;
  
  /* Notion Sticker Accent Palette */
  --accent-sky: #62aef0;
  --accent-purple: #d6b6f6;
  --accent-purple-deep: #391c57;
  --accent-pink: #ff64c8;
  --accent-orange: #dd5b00;
  --accent-orange-deep: #793400;
  --accent-teal: #2a9d99;
  --accent-green: #1aae39;
  --accent-brown: #523410;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* Border radius tokens */
  --radius-xs: 4px;
  --radius-sm: 5px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Spacing */
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 28px;
  --space-xxl: 32px;

  /* Barely-there Notion shadows */
  --shadow-flat: none;
  --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.03);
  --shadow-elevated: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 10px 24px -3px rgba(0, 0, 0, 0.05);
}

/* Reset & Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-canvas-soft);
  color: var(--color-ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Top Navigation Bar */
.notion-navbar {
  background-color: var(--color-canvas);
  border-bottom: 1px solid var(--color-hairline);
  padding: var(--space-sm) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.notion-brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 600;
  font-size: 15px;
  color: var(--color-ink);
  letter-spacing: -0.125px;
}

.brand-icon {
  width: 28px;
  height: 28px;
  background: var(--color-canvas-soft);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.brand-text-group {
  display: flex;
  flex-direction: column;
}

.brand-title-row {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.brand-subtitle {
  font-size: 11px;
  font-weight: 400;
  color: var(--color-ink-muted);
  line-height: 1.3;
}

.brand-subtitle a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
}

.brand-subtitle a:hover {
  text-decoration: underline;
  color: var(--color-primary-active);
}

.version-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-ink-muted);
  background: var(--color-canvas-soft);
  border: 1px solid var(--color-hairline);
  padding: 1px 7px;
  border-radius: var(--radius-full);
  letter-spacing: 0.2px;
  margin-left: 2px;
  user-select: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Page Main Container */
.main-layout {
  max-width: 680px;
  width: 100%;
  margin: 0 auto;
  padding: 16px 12px 32px;
  flex: 1;
}

/* Level Selector (Segmented Tabs) */
.level-selector-card {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: 4px 8px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.level-buttons {
  display: flex;
  background: var(--color-canvas-soft);
  padding: 3px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-hairline);
  gap: 3px;
}

.btn-level {
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-ink-muted);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-level:hover {
  color: var(--color-ink);
}

.btn-level.active {
  background: var(--color-canvas);
  color: var(--color-ink);
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

.level-badge-chip {
  display: inline-block;
  padding: 1px 5px;
  font-size: 11px;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(0,0,0,0.06);
}

/* Main Game Card */
.game-card {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: 16px 14px;
  box-shadow: var(--shadow-soft);
  margin-bottom: 12px;
  position: relative;
}

/* Reference Note & Sound Visualizer Row */
.question-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-hairline);
  margin-bottom: 10px;
}

.reference-note-box {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.ref-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-ink-faint);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.ref-note-display {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  background: rgba(0, 117, 222, 0.08);
  padding: 4px 12px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: -0.25px;
}

/* Audio Visualizer Waves */
.sound-waves {
  display: flex;
  align-items: center;
  gap: 3px;
  height: 24px;
}

.sound-bar {
  width: 3px;
  height: 6px;
  background: var(--color-hairline);
  border-radius: 2px;
  transition: all 0.15s ease;
}

.sound-waves.active .sound-bar {
  background: var(--color-primary);
  animation: soundPulse 0.6s infinite ease-in-out alternate;
}

.sound-waves.active .sound-bar:nth-child(2) { animation-delay: 0.15s; }
.sound-waves.active .sound-bar:nth-child(3) { animation-delay: 0.3s; }
.sound-waves.active .sound-bar:nth-child(4) { animation-delay: 0.45s; }
.sound-waves.active .sound-bar:nth-child(5) { animation-delay: 0.2s; }

@keyframes soundPulse {
  0% { height: 4px; }
  100% { height: 20px; }
}

/* Playback Control Area */
.playback-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 8px 0 12px;
  text-align: center;
}

.playback-helper-text {
  font-size: 13px;
  color: var(--color-ink-muted);
  margin-bottom: 8px;
}

/* Primary Replay Button (Pill CTA) */
.btn-replay-main {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border: none;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 22px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background-color 0.15s ease, transform 0.1s ease;
  box-shadow: 0 2px 8px rgba(0, 117, 222, 0.25);
}

.btn-replay-main:hover {
  background-color: var(--color-primary-active);
}

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

.btn-replay-main .key-hint {
  font-size: 10px;
  background: rgba(255, 255, 255, 0.25);
  padding: 1px 5px;
  border-radius: var(--radius-xs);
  margin-left: 2px;
}

/* Secondary Audio Tools */
.secondary-playback-tools {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-util {
  background: var(--color-surface);
  color: var(--color-ink-secondary);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  padding: 4px 14px;
  font-size: 13px;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.15s ease;
}

.btn-util:hover {
  background: var(--color-canvas-soft);
  color: var(--color-ink);
  border-color: #d8d8d8;
}

/* Choices Grid - 4 Columns */
.choices-section {
  margin-top: 10px;
}

.choices-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

/* Grid layout based on choices count */
.choices-grid.count-2 {
  grid-template-columns: repeat(2, 1fr);
  max-width: 320px;
  margin: 0 auto;
}

.choices-grid.count-4 {
  grid-template-columns: repeat(4, 1fr);
}

.choices-grid.count-6 {
  grid-template-columns: repeat(4, 1fr);
}

.choices-grid.count-6 .btn-choice:nth-child(5) {
  grid-column: 2 / span 1;
}

/* Choice Button - Compact */
.btn-choice {
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  padding: 7px 3px;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  font-family: inherit;
  position: relative;
  min-height: 46px;
}

.btn-choice:hover:not(:disabled) {
  border-color: #b3b3b3;
  background: #faf9f8;
  transform: translateY(-1px);
}

.btn-choice:active:not(:disabled) {
  transform: translateY(0);
}

.choice-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: -0.2px;
  line-height: 1.15;
  white-space: normal;
  word-break: keep-all;
}

.choice-sub {
  font-size: 11px;
  color: var(--color-ink-muted);
  line-height: 1.1;
}

.choice-key {
  position: absolute;
  top: 2px;
  right: 4px;
  font-size: 9px;
  color: var(--color-ink-faint);
  opacity: 0.5;
}

@media (max-width: 480px) {
  .btn-choice {
    padding: 6px 2px;
    min-height: 44px;
  }
  .choice-name {
    font-size: 12px;
    letter-spacing: -0.3px;
  }
  .choice-sub {
    font-size: 10px;
  }
  .choices-grid {
    gap: 4px;
  }
}

/* Choice States after answering */
.btn-choice.correct {
  border-color: var(--accent-green) !important;
  background: rgba(26, 174, 57, 0.07) !important;
  box-shadow: 0 0 0 1px var(--accent-green);
}

.btn-choice.correct .choice-name {
  color: #12822a;
}

.btn-choice.incorrect {
  border-color: var(--accent-orange) !important;
  background: rgba(221, 91, 0, 0.06) !important;
}

.btn-choice.incorrect .choice-name {
  color: var(--accent-orange-deep);
}

.btn-choice.dimmed {
  opacity: 0.55;
}

/* Result Feedback Card (Shown after answering) */
.result-card {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-hairline);
  background: var(--color-canvas-soft);
  display: none;
  animation: fadeIn 0.2s ease-out;
}

.result-card.show {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.result-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.result-title {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.25px;
}

.result-title.correct {
  color: var(--accent-green);
}

.result-title.incorrect {
  color: var(--accent-orange);
}

.btn-next {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border: none;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background-color 0.15s ease;
}

.btn-next:hover {
  background-color: var(--color-primary-active);
}

/* Answer Breakdown Info */
.answer-details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.detail-item {
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
}

.detail-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-ink-faint);
  text-transform: uppercase;
}

.detail-val {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  margin-top: 2px;
}

/* Mini Piano Visualizer */
.piano-wrapper {
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-top: var(--space-sm);
  overflow-x: auto;
}

.piano-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
}

.mini-piano {
  display: flex;
  position: relative;
  height: 85px;
  min-width: 480px;
  user-select: none;
  background: #eee;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid #d0d0d0;
}

.piano-white-key {
  flex: 1;
  background: #ffffff;
  border-right: 1px solid #e0e0e0;
  height: 100%;
  position: relative;
  cursor: pointer;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 4px;
  font-size: 10px;
  color: var(--color-ink-faint);
}

.piano-white-key:hover {
  background: #fafafa;
}

.piano-black-key {
  position: absolute;
  width: 6%;
  height: 55%;
  background: #222;
  z-index: 2;
  border-radius: 0 0 3px 3px;
  cursor: pointer;
}

.piano-black-key:hover {
  background: #333;
}

/* Active note indicators on piano */
.piano-key.root-active {
  background: #0075de !important;
  color: #fff !important;
}

.piano-key.target-active {
  background: #1aae39 !important;
  color: #fff !important;
}

.key-badge {
  position: absolute;
  top: 4px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 9px;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 3px;
  color: white;
  white-space: nowrap;
  pointer-events: none;
}

.key-badge.root {
  background: var(--color-primary);
}

.key-badge.target {
  background: var(--accent-green);
}

/* Stats Footer Bar */
.stats-bar {
  display: flex;
  align-items: center;
  justify-content: space-around;
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  margin-top: var(--space-lg);
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--color-ink);
}

.stat-desc {
  font-size: 12px;
  color: var(--color-ink-muted);
}


.notion-footer {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  font-size: 13px;
  color: var(--color-ink-faint);
  border-top: 1px solid var(--color-hairline);
  background: var(--color-canvas-soft);
  margin-top: auto;
}

/* 終了ボタン (Finish Button) */
.btn-finish {
  background: var(--color-surface);
  color: var(--color-ink-secondary);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-full);
  padding: 9px 20px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.btn-finish:hover {
  background: var(--color-canvas-soft);
  color: var(--color-ink);
  border-color: #c9c7c5;
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.btn-finish:active {
  transform: translateY(0);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  pointer-events: none;
  width: max-content;
  max-width: 90vw;
}

.toast {
  background: #191919;
  color: #ffffff;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-size: 13.5px;
  font-weight: 500;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: auto;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast.info {
  border-left: 3px solid var(--accent-sky);
}

.toast.warning {
  border-left: 3px solid var(--accent-orange);
}

.toast.success {
  border-left: 3px solid var(--accent-green);
}

/* Modal Overlay & Card */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 15, 15, 0.5);
  backdrop-filter: blur(2px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-elevated);
  max-width: 580px;
  width: 100%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modalPop 0.2s ease-out;
}

@keyframes modalPop {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-ink);
}

.btn-close-modal {
  background: none;
  border: none;
  font-size: 16px;
  color: var(--color-ink-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-xs);
  line-height: 1;
}

.btn-close-modal:hover {
  background: var(--color-canvas-soft);
  color: var(--color-ink);
}

.modal-body {
  padding: var(--space-md) var(--space-lg);
  overflow-y: auto;
  flex: 1;
}

.modal-desc {
  font-size: 13px;
  color: var(--color-ink-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
}

.export-preview-box {
  background: var(--color-canvas-soft);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  padding: 12px;
  max-height: 220px;
  overflow-y: auto;
}

.export-preview-box pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--color-ink);
  white-space: pre-wrap;
  word-break: break-word;
}

.modal-footer {
  padding: var(--space-sm) var(--space-lg);
  border-top: 1px solid var(--color-hairline);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  background: var(--color-canvas-soft);
}

.btn-primary-modal {
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  padding: 6px 18px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.btn-primary-modal:hover {
  background: var(--color-primary-active);
}

/* Amazon Banner Area */
.banner-area {
  margin-top: 16px;
  width: 100%;
  display: flex;
  justify-content: center;
}