/* 税理士試験 簿財学習アプリ - サイドバーレイアウト + スマホ対応 */

:root {
  /* ニュートラル */
  --gray-50: #fafafa;
  --gray-100: #f4f4f5;
  --gray-200: #e4e4e7;
  --gray-300: #d4d4d8;
  --gray-400: #a1a1aa;
  --gray-500: #71717a;
  --gray-600: #52525b;
  --gray-700: #3f3f46;
  --gray-800: #27272a;
  --gray-900: #18181b;

  /* アクセント */
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --green-500: #10b981;
  --green-600: #059669;
  --amber-500: #f59e0b;
  --amber-600: #d97706;
  --red-500: #ef4444;
  --red-600: #dc2626;

  /* セマンティック */
  --color-text: var(--gray-900);
  --color-text-light: var(--gray-600);
  --color-text-muted: var(--gray-500);
  --color-bg: #ffffff;
  --color-surface: #ffffff;
  --color-surface-alt: var(--gray-50);
  --color-border: var(--gray-200);
  --color-border-strong: var(--gray-300);
  --color-primary: var(--blue-600);
  --color-primary-bg: #eff6ff;
  --color-secondary: var(--green-600);
  --color-secondary-bg: #ecfdf5;
  --color-accent: var(--amber-600);
  --color-danger: var(--red-600);

  /* サイドバー */
  --sidebar-bg: var(--gray-900);
  --sidebar-text: var(--gray-200);
  --sidebar-text-muted: var(--gray-400);
  --sidebar-border: var(--gray-800);
  --sidebar-hover: var(--gray-800);
  --sidebar-active-bg: var(--gray-800);
  --sidebar-width: 240px;

  /* タイポ */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, monospace;

  /* 余白 */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;

  /* 角丸 */
  --radius: 6px;
  --radius-lg: 8px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  height: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.55;
  color: var(--color-text);
  background-color: var(--color-bg);
  letter-spacing: 0.01em;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

button {
  font-family: inherit;
}

input, select, textarea {
  font-family: inherit;
}

/* === サイドバー === */
.sidebar {
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  border-right: 1px solid var(--sidebar-border);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: var(--space-5) var(--space-4) var(--space-3);
  border-bottom: 1px solid var(--sidebar-border);
}

.app-title-btn {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
  color: inherit;
  text-align: left;
  display: block;
  width: 100%;
  border-radius: var(--radius);
  transition: background 0.15s, transform 0.15s;
}

.app-title-btn:hover {
  background: rgba(255,255,255,0.06);
  transform: translateX(2px);
}

.app-title-btn:active {
  transform: translateX(0);
}

.app-title {
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--sidebar-text);
  letter-spacing: -0.01em;
  margin: 0;
  padding: 4px 6px;
}

.app-icon {
  font-size: 18px;
}

.sidebar-subtitle {
  font-size: 11px;
  color: var(--sidebar-text-muted);
  margin-top: 2px;
  letter-spacing: 0.02em;
}

/* === ザイムくんマスコット === */
.sidebar-mascot {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 0 4px;
  margin-top: 8px;
  border-top: 1px solid var(--sidebar-border);
}

.sidebar-mascot img {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
  transition: transform 0.3s ease;
}

.sidebar-mascot img:hover {
  transform: scale(1.1) rotate(-5deg);
}

.mascot-bubble {
  font-size: 11px;
  color: var(--sidebar-text);
  background: var(--gray-800);
  border: 1px solid var(--sidebar-border);
  border-radius: 12px;
  padding: 6px 10px;
  position: relative;
  flex: 1;
  line-height: 1.4;
}

.mascot-bubble::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 50%;
  transform: translateY(-50%);
  border-style: solid;
  border-width: 6px 6px 6px 0;
  border-color: transparent var(--gray-800) transparent transparent;
}

.mascot-bubble::after {
  content: '';
  position: absolute;
  left: -7px;
  top: 50%;
  transform: translateY(-50%);
  border-style: solid;
  border-width: 7px 7px 7px 0;
  border-color: transparent var(--sidebar-border) transparent transparent;
  z-index: -1;
}

@keyframes mascotBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.sidebar-mascot.celebrate img {
  animation: mascotBounce 0.6s ease-in-out 3;
}

/* トースト用ザイムくん */
.toast-with-mascot {
  display: flex;
  align-items: center;
  gap: 12px;
}

.toast-mascot {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

/* カウントダウン */
.sidebar-countdown {
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  border-bottom: 1px solid var(--sidebar-border);
}

.countdown-block {
  background: var(--gray-800);
  border: 1px solid var(--sidebar-border);
  border-radius: var(--radius);
  padding: 8px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.countdown-label {
  font-size: 11px;
  color: var(--sidebar-text-muted);
  letter-spacing: 0.02em;
}

.countdown-value {
  font-size: 15px;
  font-weight: 600;
  color: var(--sidebar-text);
  font-variant-numeric: tabular-nums;
}

.countdown-block.urgent {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.4);
}

.countdown-block.urgent .countdown-value {
  color: #fca5a5;
}

/* ナビゲーション */
.sidebar-nav {
  flex: 1;
  padding: var(--space-3) var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-nav-btn {
  background: none;
  border: none;
  padding: 10px 12px;
  cursor: pointer;
  font-size: 13px;
  color: var(--sidebar-text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
  border-radius: var(--radius);
  transition: all 0.15s;
  text-align: left;
  width: 100%;
  font-weight: 500;
}

.sidebar-nav-btn:hover {
  background: var(--sidebar-hover);
  color: var(--sidebar-text);
}

.sidebar-nav-btn.active {
  background: var(--sidebar-active-bg);
  color: white;
  font-weight: 600;
}

.nav-icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
}

.nav-label {
  flex: 1;
}

.sidebar-footer {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--sidebar-border);
  font-size: 11px;
}

.sidebar-footer a {
  color: var(--sidebar-text-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.sidebar-footer a:hover {
  color: var(--sidebar-text);
}

/* ハンバーガーメニュー */
.menu-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 300;
  width: 40px;
  height: 40px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px;
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.2s;
}

.menu-toggle.open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.menu-toggle.open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* サイドバーオーバーレイ */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 150;
  opacity: 0;
  transition: opacity 0.3s;
}

.sidebar-overlay.visible {
  display: block;
  opacity: 1;
}

/* === メインコンテンツ === */
.app-main {
  padding: var(--space-5) var(--space-6);
  max-width: 1100px;
  width: 100%;
  min-height: 100vh;
}

.tab-content {
  display: none;
  animation: fadeIn 0.2s ease-out;
}

.tab-content.active {
  display: block;
}

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

.content-header {
  margin-bottom: var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-4);
  flex-wrap: wrap;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.content-header > div:first-child {
  flex: 1;
  min-width: 200px;
}

.content-header h2 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 2px;
}

.content-note {
  color: var(--color-text-muted);
  font-size: 12px;
}

/* === フィルターバー === */
.filter-bar {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
  align-items: center;
}

.filter-btn {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  color: var(--color-text-light);
  transition: all 0.15s;
  font-weight: 500;
}

.filter-btn:hover {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.filter-btn.active {
  background: var(--color-text);
  color: white;
  border-color: var(--color-text);
}

.filter-select {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 4px 8px;
  font-size: 12px;
  font-family: inherit;
  color: var(--color-text);
  cursor: pointer;
}

/* === 教科書カード === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-3);
}

.chapter-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
}

.chapter-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-primary);
  border-radius: var(--radius) 0 0 var(--radius);
}

.chapter-card.subject-zaimu::before {
  background: var(--color-secondary);
}

.chapter-card:hover {
  border-color: var(--color-border-strong);
  background: var(--color-surface-alt);
  transform: translateY(-1px);
}

.chapter-card.completed {
  background: var(--color-secondary-bg);
}

.chapter-card.completed::after {
  content: "✓";
  position: absolute;
  top: 10px;
  right: 10px;
  color: var(--color-secondary);
  font-size: 14px;
  font-weight: bold;
}

.chapter-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}

.chapter-no {
  background: var(--color-primary-bg);
  color: var(--color-primary);
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 3px;
  letter-spacing: 0.02em;
}

.chapter-card.subject-zaimu .chapter-no {
  background: var(--color-secondary-bg);
  color: var(--color-secondary);
}

.chapter-importance {
  font-size: 10px;
}

.chapter-hours {
  margin-left: auto;
  font-size: 10px;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.chapter-title {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.chapter-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  margin-top: 4px;
}

.topic-tag {
  background: var(--color-surface-alt);
  color: var(--color-text-light);
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 3px;
}

.chapter-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
}

.chapter-checkbox {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--color-text-muted);
  cursor: pointer;
}

.chapter-checkbox input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--color-primary);
}

/* === ビュアー === */
.viewer {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  max-width: 800px;
  margin: 0 auto;
}

.viewer.hidden {
  display: none;
}

.viewer-close {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-light);
  padding: 4px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: all 0.15s;
}

.viewer-close:hover {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

/* === ビュアーのツールバー === */
.viewer-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.viewer-status-controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.status-label {
  font-size: 11px;
  color: var(--color-text-muted);
  font-weight: 500;
}

.status-buttons {
  display: flex;
  gap: 2px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2px;
}

.status-btn {
  background: none;
  border: none;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  color: var(--color-text-muted);
  border-radius: 4px;
  font-family: inherit;
  transition: all 0.15s;
}

.status-btn:hover {
  color: var(--color-text);
}

.status-btn.active {
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.status-btn[data-status="completed"].active {
  background: var(--color-secondary);
  color: white;
}

.status-btn[data-status="in-progress"].active {
  background: var(--amber-500);
  color: white;
}

.viewer-footer-actions {
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: center;
  gap: var(--space-2);
}

.viewer-footer-actions .btn {
  padding: 8px 20px;
  font-size: 13px;
}

#markCompletedBtn.completed {
  background: var(--color-secondary);
  color: white;
  border-color: var(--color-secondary);
}

/* === 章別進捗のステータス変更プルダウン === */
.chapter-progress-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 12px;
}

.chapter-status-select {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2px 6px;
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  font-weight: 500;
}

.chapter-status-select.status-not-started { color: var(--color-text-muted); }
.chapter-status-select.status-in-progress { color: #b45309; background: #fef3c7; }
.chapter-status-select.status-completed { color: var(--color-secondary); background: var(--color-secondary-bg); }

@media (max-width: 768px) {
  .viewer-toolbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .status-btn {
    padding: 4px 8px;
    font-size: 10px;
  }
}

/* === 過去問例セクション === */
.past-questions-section {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 2px solid var(--color-border);
}

.past-questions-section h2 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  letter-spacing: -0.01em;
}

.past-questions-section h2::before {
  content: "📝";
  font-size: 18px;
}

.past-q-intro {
  color: var(--color-text-muted);
  font-size: 12px;
  margin-bottom: var(--space-3);
}

.past-q-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.past-q-item {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
}

.past-q-meta {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.past-q-year {
  background: var(--color-text);
  color: white;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 3px;
  letter-spacing: 0.02em;
}

.past-q-section {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  font-size: 11px;
  padding: 1px 8px;
  border-radius: 3px;
  color: var(--color-text-light);
}

.past-q-summary {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
}

.past-q-example {
  background: var(--color-bg);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-3);
  font-size: 12px;
  line-height: 1.6;
  color: var(--color-text-light);
}

.past-q-example::before {
  content: "出題例";
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-surface-alt);
  padding: 1px 6px;
  border-radius: 3px;
  margin-right: 6px;
  letter-spacing: 0.02em;
}

/* === Markdown描画 === */
.markdown-content {
  line-height: 1.7;
  color: var(--color-text);
  max-width: 720px;
  font-size: 14px;
}

.markdown-content h1 {
  font-size: 22px;
  margin: 0 0 var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.markdown-content h2 {
  font-size: 17px;
  margin: var(--space-5) 0 var(--space-2);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.markdown-content h3 {
  font-size: 14px;
  margin: var(--space-4) 0 var(--space-2);
  font-weight: 600;
}

.markdown-content h4 {
  font-size: 13px;
  margin: var(--space-3) 0 4px;
  font-weight: 600;
  color: var(--color-text-light);
}

.markdown-content p { margin: var(--space-2) 0; }

.markdown-content ul, .markdown-content ol {
  margin: var(--space-2) 0;
  padding-left: 22px;
}

.markdown-content li { margin: 2px 0; }

.markdown-content table {
  border-collapse: collapse;
  margin: var(--space-3) 0;
  width: 100%;
  font-size: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.markdown-content table th {
  background: var(--color-surface-alt);
  color: var(--color-text);
  padding: 6px 10px;
  text-align: left;
  font-weight: 600;
  border-bottom: 1px solid var(--color-border);
}

.markdown-content table td {
  padding: 5px 10px;
  border-bottom: 1px solid var(--color-border);
}

.markdown-content table tr:last-child td { border-bottom: none; }

.markdown-content code {
  background: var(--color-surface-alt);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.markdown-content pre {
  background: var(--gray-900);
  color: var(--gray-100);
  padding: var(--space-3);
  border-radius: var(--radius);
  overflow-x: auto;
  margin: var(--space-3) 0;
  font-size: 12px;
  line-height: 1.5;
}

.markdown-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.markdown-content strong {
  color: var(--color-text);
  font-weight: 600;
}

.markdown-content blockquote {
  border-left: 2px solid var(--color-accent);
  padding: 6px var(--space-3);
  background: #fffbeb;
  margin: var(--space-3) 0;
  color: var(--gray-700);
  font-size: 13px;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.markdown-content a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.markdown-content a:hover {
  border-bottom-color: var(--color-primary);
}

.markdown-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-4) 0;
}

/* === 問題集 === */
.problems-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.problem-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  position: relative;
}

.problem-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-primary);
  border-radius: var(--radius) 0 0 var(--radius);
}

.problem-card.subject-zaimu::before {
  background: var(--color-secondary);
}

.problem-card.completed { background: var(--color-secondary-bg); }

.problem-meta {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.problem-subject {
  background: var(--color-primary-bg);
  color: var(--color-primary);
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 3px;
  font-weight: 600;
}

.problem-card.subject-zaimu .problem-subject {
  background: var(--color-secondary-bg);
  color: var(--color-secondary);
}

.problem-category {
  background: var(--color-surface-alt);
  color: var(--color-text-light);
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 3px;
}

.problem-difficulty {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 3px;
  font-weight: 500;
}

.problem-difficulty.basic { background: #ecfdf5; color: #047857; }
.problem-difficulty.intermediate { background: #fef3c7; color: #b45309; }
.problem-difficulty.advanced { background: #fce7f3; color: #be185d; }

.problem-time {
  margin-left: auto;
  font-size: 10px;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.problem-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.problem-question {
  background: var(--color-surface-alt);
  border-left: 2px solid var(--color-accent);
  padding: var(--space-2) var(--space-3);
  margin: var(--space-2) 0;
  font-size: 13px;
  border-radius: 0 var(--radius) var(--radius) 0;
  line-height: 1.6;
}

.problem-answer-block { margin-top: var(--space-2); }

.problem-answer-toggle {
  background: var(--color-text);
  color: white;
  border: none;
  padding: 5px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
}

.problem-answer-toggle:hover { opacity: 0.85; }

.problem-answer-content {
  background: var(--color-primary-bg);
  border: 1px solid var(--color-border);
  padding: var(--space-3);
  border-radius: var(--radius);
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: pre-wrap;
  display: none;
  line-height: 1.6;
}

.problem-answer-content.visible { display: block; }

.problem-explanation {
  background: var(--color-surface-alt);
  padding: 6px var(--space-3);
  border-radius: var(--radius);
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-text-light);
  border-left: 2px solid var(--color-border-strong);
  line-height: 1.6;
}

.problem-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
}

/* === 過去問 === */
.pastexams-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.exam-set {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
}

.exam-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.exam-year {
  font-size: 15px;
  font-weight: 600;
}

.exam-date {
  color: var(--color-text-muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.exam-subjects {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

@media (max-width: 600px) {
  .exam-subjects { grid-template-columns: 1fr; }
}

.exam-subject {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  background: var(--color-surface-alt);
}

.exam-subject-name {
  font-weight: 600;
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 13px;
}

.exam-subject-name.boki { color: var(--color-primary); }
.exam-subject-name.zaimu { color: var(--color-secondary); }

.exam-rate {
  font-size: 10px;
  color: var(--color-text-muted);
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  font-weight: 400;
}

.exam-pdf-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.pdf-link {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 4px 10px;
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 11px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 500;
}

.pdf-link:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-border-strong);
}

.pdf-link.errata {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.exam-topics {
  margin-top: var(--space-2);
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
}

/* === スケジュール === */
.schedule-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.phase-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  position: relative;
}

.phase-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: var(--radius) 0 0 var(--radius);
  background: var(--color-primary);
}

.phase-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.phase-icon {
  font-size: 16px;
}

.phase-name {
  font-size: 14px;
  font-weight: 600;
}

.phase-dates {
  margin-left: auto;
  font-size: 11px;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}

.phase-summary {
  color: var(--color-text-light);
  margin-bottom: var(--space-2);
  font-size: 12px;
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.phase-tasks {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.phase-task {
  padding: 6px var(--space-2);
  background: var(--color-surface-alt);
  border-radius: var(--radius);
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: 12px;
}

.phase-task input[type="checkbox"] {
  margin-top: 2px;
  cursor: pointer;
  accent-color: var(--color-primary);
}

.phase-task.completed { opacity: 0.5; }
.phase-task.completed .task-title { text-decoration: line-through; }

.task-date {
  font-size: 10px;
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 1px 6px;
  border-radius: 3px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  border: 1px solid var(--color-border);
}

.task-title {
  flex: 1;
  line-height: 1.5;
}

.task-details {
  display: block;
  font-size: 10px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.weekly-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
  margin-top: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.weekly-table th, .weekly-table td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}

.weekly-table tr:last-child td { border-bottom: none; }

.weekly-table th {
  background: var(--color-surface-alt);
  font-weight: 600;
  font-size: 10px;
  letter-spacing: 0.02em;
  color: var(--color-text-light);
  text-transform: uppercase;
}

/* === 3周モデル概要カード === */
.rounds-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-2);
}

@media (max-width: 768px) {
  .rounds-grid { grid-template-columns: 1fr; }
}

.round-card {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
}

.round-num {
  font-size: 10px;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.round-name {
  font-size: 13px;
  font-weight: 600;
  margin: 4px 0;
  letter-spacing: -0.01em;
}

.round-period {
  font-size: 11px;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  margin-bottom: 6px;
}

.round-goal {
  font-size: 11px;
  line-height: 1.5;
  color: var(--color-text-light);
}

/* === 会計基準タブ === */
.standard-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
  border-left: 3px solid var(--gray-500);
}

.standard-card:hover {
  border-color: var(--color-border-strong);
  background: var(--color-surface-alt);
  transform: translateY(-1px);
}

.standard-meta {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.standard-number {
  background: var(--color-text);
  color: white;
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 3px;
  letter-spacing: 0.02em;
}

.standard-cat {
  background: var(--color-surface-alt);
  color: var(--color-text-light);
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 3px;
  font-weight: 500;
}

.standard-importance {
  font-size: 10px;
  margin-left: auto;
}

.standard-title {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.standard-summary {
  font-size: 11px;
  line-height: 1.6;
  color: var(--color-text-light);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.standard-year {
  font-size: 10px;
  color: var(--color-text-muted);
  margin-top: 6px;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}

/* ビュアー */
.standards-detail {
  font-size: 14px;
  line-height: 1.7;
}

.std-detail-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-3);
}

.std-detail-meta {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-bottom: var(--space-2);
  flex-wrap: wrap;
}

.std-detail-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.std-detail-publisher {
  font-size: 11px;
  color: var(--color-text-muted);
}

.std-detail-section {
  margin-bottom: var(--space-4);
}

.std-detail-section h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  padding-bottom: 4px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 6px;
}

.std-detail-section h3::before {
  content: '';
  width: 3px;
  height: 12px;
  background: var(--color-text);
  border-radius: 2px;
}

.std-summary-block {
  background: var(--color-surface-alt);
  border-radius: var(--radius);
  padding: var(--space-3);
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text);
}

.std-keypoints {
  list-style: none;
  padding: 0;
}

.std-keypoints li {
  padding: 6px 0 6px 24px;
  font-size: 13px;
  position: relative;
  border-bottom: 1px solid var(--color-border);
  line-height: 1.6;
}

.std-keypoints li:last-child { border-bottom: none; }

.std-keypoints li::before {
  content: '✓';
  position: absolute;
  left: 4px;
  top: 6px;
  color: var(--color-secondary);
  font-weight: bold;
  font-size: 14px;
}

.std-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.std-topic-tag {
  background: var(--color-primary-bg);
  color: var(--color-primary);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 3px;
  font-weight: 500;
}

.std-link-row {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-2);
}

.std-pdf-btn {
  background: var(--color-text);
  color: white;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: opacity 0.15s;
}

.std-pdf-btn:hover { opacity: 0.85; }

.std-pdf-btn.secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.std-related-chapters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.std-chapter-link {
  background: var(--color-secondary-bg);
  color: var(--color-secondary);
  text-decoration: none;
  padding: 4px 10px;
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: all 0.15s;
  cursor: pointer;
}

.std-chapter-link:hover {
  border-color: var(--color-secondary);
}

.std-info-grid {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 6px var(--space-3);
  font-size: 12px;
}

.std-info-label {
  color: var(--color-text-muted);
  font-weight: 500;
}

.std-info-value {
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

/* 教科書ビュアーの関連基準セクション */
.related-standards-section {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 2px solid var(--color-border);
}

.related-standards-section h2 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  letter-spacing: -0.01em;
}

.related-standards-section h2::before {
  content: '📜';
  font-size: 18px;
}

.related-std-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.related-std-item {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.related-std-item:hover {
  background: var(--color-bg);
  border-color: var(--color-border-strong);
}

.related-std-num {
  background: var(--color-text);
  color: white;
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 3px;
  flex-shrink: 0;
}

.related-std-title {
  flex: 1;
  font-size: 12px;
  font-weight: 500;
}

.related-std-arrow {
  color: var(--color-text-muted);
  font-size: 12px;
}

/* === 日次計画テーブル === */
.daily-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
  margin-top: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  table-layout: fixed;
}

.daily-table th, .daily-table td {
  padding: 5px 6px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
  word-break: break-word;
}

.daily-table tr:last-child td { border-bottom: none; }

.daily-table th {
  background: var(--color-surface-alt);
  font-weight: 600;
  font-size: 10px;
  color: var(--color-text-light);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.daily-table .col-day { width: 32px; text-align: center; font-variant-numeric: tabular-nums; color: var(--color-text-muted); }
.daily-table .col-date { width: 48px; font-variant-numeric: tabular-nums; font-family: var(--font-mono); color: var(--color-text-muted); }
.daily-table .col-wd { width: 28px; text-align: center; }
.daily-table .col-boki { color: var(--color-primary); }
.daily-table .col-zaimu { color: var(--color-secondary); }
.daily-table .col-memo { color: var(--color-text-muted); font-size: 10px; }
.daily-table .col-check { width: 28px; text-align: center; }

.daily-table .col-check input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--color-text);
}

.daily-table .row-today {
  background: #fef3c7;
  font-weight: 500;
}

.daily-table .row-today td { background: rgba(245, 158, 11, 0.1); }
.daily-table .row-today .col-date { color: var(--color-accent); font-weight: 700; }

.daily-table .row-past td {
  background: rgba(239, 68, 68, 0.05);
}

.daily-table .row-done td {
  opacity: 0.5;
}

.daily-table .row-done .col-boki,
.daily-table .row-done .col-zaimu {
  text-decoration: line-through;
}

.daily-table .row-weekend .col-wd {
  color: var(--color-danger);
  font-weight: 600;
}

@media (max-width: 768px) {
  .daily-table {
    font-size: 10px;
  }

  .daily-table th, .daily-table td {
    padding: 4px 4px;
  }

  .daily-table .col-day,
  .daily-table .col-wd,
  .daily-table .col-check {
    width: 24px;
  }

  .daily-table .col-date { width: 40px; }
  .daily-table .col-memo { display: none; }
}

.exam-day-schedule {
  margin-top: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.exam-day-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  padding: 5px var(--space-2);
  border-bottom: 1px solid var(--color-border);
  font-size: 12px;
  align-items: center;
}

.exam-day-row:last-child { border-bottom: none; }

.exam-day-row.highlight {
  background: var(--color-primary-bg);
  font-weight: 600;
}

.checklist {
  margin-top: var(--space-2);
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.checklist li {
  padding: 3px 0;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.checklist input[type="checkbox"] {
  accent-color: var(--color-primary);
}

/* === 進捗・学習記録 === */
.progress-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.stat-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
}

.stat-label {
  font-size: 11px;
  color: var(--color-text-muted);
  margin-bottom: 4px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-value {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.stat-unit {
  font-size: 11px;
  font-weight: 400;
  color: var(--color-text-muted);
}

.stat-sub {
  font-size: 11px;
  color: var(--color-text-light);
  margin-top: 6px;
}

.progress-bar {
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--color-text);
  width: 0%;
  transition: width 0.3s ease;
  border-radius: 2px;
}

/* 学習セクション */
.study-section {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
}

.study-section h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.study-section h4 {
  font-size: 13px;
  font-weight: 600;
  margin: var(--space-3) 0 var(--space-2);
  color: var(--color-text-light);
}

/* 学習フォーム */
.study-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.form-row-inline {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.form-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-light);
  min-width: 70px;
}

.form-select, .form-input {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 13px;
  font-family: inherit;
  color: var(--color-text);
  flex: 1;
  min-width: 120px;
}

.form-select:focus, .form-input:focus {
  outline: none;
  border-color: var(--color-text);
}

.form-select:disabled {
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

/* タイマー */
.study-timer {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}

.timer-display {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.manual-entry {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}

.btn {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 6px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text);
  transition: all 0.15s;
  white-space: nowrap;
}

.btn:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-border-strong);
}

.btn-primary {
  background: var(--color-text);
  color: white;
  border-color: var(--color-text);
}

.btn-primary:hover { opacity: 0.85; }

.btn-danger {
  background: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}

.btn-danger:hover { opacity: 0.85; }

/* 学習履歴 */
.study-log-summary {
  display: flex;
  gap: var(--space-4);
  font-size: 12px;
  color: var(--color-text-light);
  margin-bottom: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.study-log-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 300px;
  overflow-y: auto;
}

.study-log-row {
  display: grid;
  grid-template-columns: 80px 60px 1fr 50px 30px;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 8px;
  background: var(--color-surface-alt);
  border-radius: var(--radius);
  font-size: 12px;
}

.log-date {
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  font-size: 11px;
}

.log-subject {
  font-weight: 600;
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 3px;
  text-align: center;
}

.log-subject.boki { background: var(--color-primary-bg); color: var(--color-primary); }
.log-subject.zaimu { background: var(--color-secondary-bg); color: var(--color-secondary); }
.log-subject.empty { background: var(--color-surface-alt); color: var(--color-text-muted); }

.log-content {
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.log-minutes {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--color-text-light);
  font-size: 11px;
}

.log-delete {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 2px;
  border-radius: 3px;
  line-height: 1;
}

.log-delete:hover {
  background: var(--color-danger);
  color: white;
}

/* 章別進捗 */
.chapter-progress-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 5px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 12px;
}

.chapter-progress-row:last-child { border-bottom: none; }

.chapter-progress-name { flex: 1; }

.chapter-progress-status {
  font-size: 10px;
  padding: 1px 8px;
  border-radius: 10px;
  font-weight: 500;
}

.status-not-started { background: var(--color-surface-alt); color: var(--color-text-muted); }
.status-in-progress { background: #fef3c7; color: #b45309; }
.status-completed { background: var(--color-secondary-bg); color: var(--color-secondary); }

.progress-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* === レスポンシブ === */
@media (max-width: 768px) {
  body {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    z-index: 200;
    transform: translateX(-100%);
    box-shadow: 2px 0 16px rgba(0,0,0,0.15);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .menu-toggle {
    display: flex;
  }

  .app-main {
    padding: 60px 16px 20px;
  }

  .content-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .content-header h2 {
    font-size: 18px;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .form-row {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .form-label {
    min-width: 0;
    font-size: 11px;
  }

  .study-timer {
    flex-direction: column;
    align-items: stretch;
  }

  .timer-display {
    text-align: center;
    font-size: 32px;
  }

  .form-row-inline {
    flex-direction: column;
    align-items: stretch;
  }

  .form-row-inline .form-input {
    width: 100% !important;
  }

  .study-log-row {
    grid-template-columns: 70px 50px 1fr 40px 24px;
    font-size: 11px;
    padding: 5px 6px;
  }

  .progress-summary {
    grid-template-columns: 1fr;
  }

  .exam-day-row {
    grid-template-columns: 90px 1fr;
  }
}

/* === ハイライト機能 === */

/* サイドバーのバッジ */
.nav-badge {
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--amber-500);
  color: white;
  font-size: 10px;
  font-weight: 700;
  min-width: 18px;
  height: 18px;
  border-radius: 9px;
  padding: 0 5px;
  margin-left: auto;
  font-variant-numeric: tabular-nums;
}

/* 選択ツールチップ */
.highlight-tooltip {
  position: fixed;
  top: 0;
  left: 0;
  background: var(--gray-900);
  border: 1px solid var(--gray-700);
  border-radius: var(--radius);
  padding: 4px;
  display: flex;
  align-items: center;
  gap: 2px;
  z-index: 9999;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  user-select: none;
  -webkit-user-select: none;
  pointer-events: auto;
}

.highlight-tooltip.hidden {
  display: none !important;
}

.highlight-tooltip .tooltip-color,
.highlight-tooltip .tooltip-action {
  background: transparent;
  border: none;
  font-size: 18px;
  width: 32px;
  height: 32px;
  border-radius: 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, transform 0.15s;
  padding: 0;
}

.highlight-tooltip .tooltip-color:hover,
.highlight-tooltip .tooltip-action:hover {
  background: var(--gray-700);
  transform: scale(1.15);
}

.highlight-tooltip .tooltip-divider {
  width: 1px;
  height: 20px;
  background: var(--gray-700);
  margin: 0 2px;
}

/* ハイライトタブ */
.highlight-stats {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px 14px;
  margin-bottom: var(--space-3);
  font-size: 12px;
}

.hl-stats-line {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  flex-wrap: wrap;
}

.hl-color-counts {
  margin-left: auto;
  color: var(--color-text-muted);
  font-size: 12px;
}

.highlights-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.highlight-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--gray-300);
  border-radius: var(--radius);
  padding: var(--space-3);
  position: relative;
}

.highlight-card.hl-color-yellow { border-left-color: #facc15; }
.highlight-card.hl-color-green  { border-left-color: #22c55e; }
.highlight-card.hl-color-blue   { border-left-color: #3b82f6; }
.highlight-card.hl-color-pink   { border-left-color: #ec4899; }

.hl-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: 6px;
  font-size: 11px;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.hl-color-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.hl-dot-yellow { background: #facc15; }
.hl-dot-green  { background: #22c55e; }
.hl-dot-blue   { background: #3b82f6; }
.hl-dot-pink   { background: #ec4899; }

.hl-chapter-link {
  color: var(--color-primary);
  cursor: pointer;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px dashed transparent;
}

.hl-chapter-link:hover {
  border-bottom-color: var(--color-primary);
}

.hl-date {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  font-variant-numeric: tabular-nums;
}

.hl-delete {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 2px 6px;
  border-radius: 3px;
  line-height: 1;
}

.hl-delete:hover {
  background: var(--color-danger);
  color: white;
}

.hl-text {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-surface-alt);
  padding: 8px 12px;
  border-radius: 4px;
}

.hl-color-yellow .hl-text { background: #fef9c3; }
.hl-color-green  .hl-text { background: #dcfce7; }
.hl-color-blue   .hl-text { background: #dbeafe; }
.hl-color-pink   .hl-text { background: #fce7f3; }

.hl-memo {
  margin-top: 6px;
  padding: 6px 10px;
  background: var(--color-bg);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius);
  font-size: 12px;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* テキスト選択時のスタイル */
#textbookContent ::selection,
#standardsContent ::selection {
  background: rgba(250, 204, 21, 0.4);
  color: var(--color-text);
}

@media (max-width: 768px) {
  .highlight-tooltip .tooltip-color,
  .highlight-tooltip .tooltip-action {
    width: 36px;
    height: 36px;
    font-size: 20px;
  }
  .hl-meta { gap: 6px; }
  .hl-date { width: 100%; margin-left: 0; }
}

/* === トースト通知 === */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--gray-900);
  color: white;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 1000;
  max-width: 90%;
  text-align: center;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* === ユーティリティ === */
.hidden { display: none !important; }
.text-center { text-align: center; }

.empty-state {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  color: var(--color-text-muted);
  font-size: 13px;
}

.imp-3 { color: var(--color-danger); }
.imp-2 { color: var(--color-accent); }
.imp-1 { color: var(--color-text-muted); }

html { scroll-behavior: smooth; }

::selection {
  background: var(--color-text);
  color: white;
}

/* スクロールバー（webkit） */
.sidebar::-webkit-scrollbar,
.study-log-list::-webkit-scrollbar {
  width: 6px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  background: var(--gray-700);
  border-radius: 3px;
}

.study-log-list::-webkit-scrollbar-track {
  background: var(--color-surface-alt);
  border-radius: 3px;
}

.study-log-list::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 3px;
}

/* ============================================
   ホームタブ（ダッシュボード）
   ============================================ */

.home-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.home-header h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 4px 0;
  color: var(--color-text);
}

.home-quick-actions {
  display: flex;
  gap: 8px;
}

/* KPI カード */
.home-kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.home-kpi-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: transform 0.15s, box-shadow 0.15s;
  position: relative;
  overflow: hidden;
}

.home-kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.home-kpi-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
}

.home-kpi-card.kpi-blue::before  { background: #3b82f6; }
.home-kpi-card.kpi-green::before { background: #10b981; }
.home-kpi-card.kpi-orange::before{ background: #f59e0b; }
.home-kpi-card.kpi-pink::before  { background: #ec4899; }

.kpi-icon {
  font-size: 32px;
  flex-shrink: 0;
}

.kpi-body {
  flex: 1;
  min-width: 0;
}

.kpi-label {
  font-size: 11px;
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.kpi-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  margin: 2px 0 4px;
  font-variant-numeric: tabular-nums;
}

.kpi-sub {
  font-size: 11px;
  color: var(--color-text-muted);
}

/* セクション */
.home-section {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin-bottom: var(--space-4);
}

.home-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.home-section-header h3 {
  font-size: 14px;
  font-weight: 600;
  margin: 0;
  color: var(--color-text);
}

.link-btn {
  background: none;
  border: none;
  color: var(--color-primary, #3b82f6);
  font-size: 12px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: background 0.15s;
}

.link-btn:hover {
  background: var(--color-surface-alt);
  text-decoration: underline;
}

/* 1週間グリッド */
.home-week-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
}

.week-day-card {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px 8px;
  min-height: 90px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.week-day-card.today {
  background: linear-gradient(180deg, rgba(59,130,246,0.08), transparent);
  border-color: #3b82f6;
  box-shadow: 0 0 0 1px #3b82f6 inset;
}

.week-day-card.past-empty {
  opacity: 0.55;
  background: var(--color-surface-alt);
}

.week-day-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 11px;
  margin-bottom: 6px;
}

.week-day-dow {
  font-weight: 700;
  color: var(--color-text);
}

.week-day-num {
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.week-day-card.today .week-day-dow {
  color: #3b82f6;
}

.week-day-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.week-day-hours {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  text-align: center;
  margin-bottom: 4px;
}

.week-day-bar {
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 4px;
}

.week-day-bar-fill {
  height: 100%;
  background: #10b981;
  border-radius: 2px;
  transition: width 0.4s;
}

.week-day-meta {
  font-size: 10px;
  color: var(--color-text-muted);
  text-align: center;
}

.week-day-empty,
.week-day-target {
  font-size: 11px;
  color: var(--color-text-muted);
  text-align: center;
}

.week-day-target {
  color: #3b82f6;
  font-weight: 500;
}

/* 昨日 */
.home-yesterday-summary {
  font-size: 13px;
  color: var(--color-text);
  margin-bottom: 10px;
  padding: 8px 12px;
  background: var(--color-surface-alt);
  border-radius: var(--radius);
}

.home-yesterday-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.home-yesterday-item {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 8px 12px;
  background: var(--color-surface-alt);
  border-radius: var(--radius);
  font-size: 12px;
}

.hy-time {
  background: #18181b;
  color: white;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.hy-subject {
  font-weight: 600;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
}

.hy-subject.subject-boki {
  background: #dbeafe;
  color: #1e40af;
}

.hy-subject.subject-zaimu {
  background: #fce7f3;
  color: #9f1239;
}

.hy-chapter {
  color: var(--color-text);
  font-weight: 500;
}

.hy-memo {
  color: var(--color-text-muted);
  font-style: italic;
}

/* 直近のハイライト（ホーム） */
.home-highlight-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.home-highlight-item {
  border-left: 4px solid;
  padding: 10px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.1s, background 0.15s;
}

.home-highlight-item:hover {
  transform: translateX(2px);
}

.home-highlight-item.hl-color-yellow { border-left-color: #facc15; background: #fef9c3; }
.home-highlight-item.hl-color-green  { border-left-color: #22c55e; background: #dcfce7; }
.home-highlight-item.hl-color-blue   { border-left-color: #3b82f6; background: #dbeafe; }
.home-highlight-item.hl-color-pink   { border-left-color: #ec4899; background: #fce7f3; }

.hh-text {
  font-size: 13px;
  color: #1f2937;
  line-height: 1.6;
  margin-bottom: 4px;
}

.hh-meta {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: #6b7280;
}

.hh-memo {
  font-size: 12px;
  color: #4b5563;
  margin-top: 4px;
  padding-top: 4px;
  border-top: 1px dashed rgba(0,0,0,0.1);
}

/* 復習推奨カード */
.home-review-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}

.home-review-card {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  text-align: left;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.15s, box-shadow 0.15s;
  font-family: inherit;
  font-size: 12px;
  color: var(--color-text);
}

.home-review-card:hover {
  transform: translateY(-2px);
  border-color: #3b82f6;
  box-shadow: 0 4px 8px rgba(0,0,0,0.06);
}

.home-review-card.subject-boki {
  border-left: 4px solid #3b82f6;
}

.home-review-card.subject-zaimu {
  border-left: 4px solid #ec4899;
}

.hrc-subj {
  font-size: 10px;
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.hrc-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin: 4px 0;
  line-height: 1.3;
}

.hrc-meta {
  font-size: 11px;
  color: #f59e0b;
  font-weight: 500;
}

/* 苦手な問題 */
.home-wrong-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.home-wrong-card {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-left: 4px solid #ef4444;
  padding: 10px 14px;
  border-radius: var(--radius);
}

.hwc-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 4px;
  font-size: 11px;
  flex-wrap: wrap;
}

.hwc-cat {
  color: var(--color-text-muted);
}

.hwc-time {
  color: var(--color-text-muted);
}

.hwc-title {
  font-weight: 600;
  font-size: 13px;
  color: var(--color-text);
  margin-bottom: 2px;
}

.hwc-q {
  font-size: 12px;
  color: #4b5563;
  line-height: 1.5;
}

.problem-card.marked-wrong {
  background: #fef2f2;
  border-left: 4px solid #ef4444;
}

.problem-wrong-badge {
  background: #ef4444;
  color: white;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 600;
}

/* 共通: 空状態 */
.home-empty {
  padding: 18px;
  text-align: center;
  color: var(--color-text-muted);
  background: var(--color-surface-alt);
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.6;
}

.home-empty small {
  font-size: 11px;
  display: block;
  margin-top: 4px;
}

.home-more {
  margin-top: 8px;
  text-align: center;
  font-size: 11px;
  color: var(--color-text-muted);
}

/* レスポンシブ */
@media (max-width: 768px) {
  .home-week-grid {
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
  }

  .week-day-card {
    padding: 6px 4px;
    min-height: 70px;
  }

  .week-day-hours {
    font-size: 14px;
  }

  .home-kpi-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .kpi-value {
    font-size: 18px;
  }

  .kpi-icon {
    font-size: 24px;
  }
}