/* --------------------------------
 * ベース設定
 * -------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  color: #222;
  background-color: #f5f5f7;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------
 * ヘッダー
 * -------------------------------- */

#site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: #ffffff;
  border-bottom: 1px solid #e0e0e0;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1rem 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title-block {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.site-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: #111;
}

.site-subtitle {
  font-size: 0.85rem;
  color: #4b5563;
  line-height: 1.3;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.header-controls button {
  border: 1px solid #d0d0d4;
  background-color: #f5f5f7;
  color: #333;
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  font-size: 0.8rem;
  cursor: pointer;
}

.header-controls button[disabled] {
  background-color: #222;
  color: #fff;
  border-color: #222;
  cursor: default;
}

.help-button {
  border: 1px solid #d1d5db;
  background-color: #ffffff;
  color: #111;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  cursor: pointer;
}

.help-button:hover {
  background-color: #f3f4f6;
}

/* --------------------------------
 * タブ
 * -------------------------------- */
#tab-nav {
  max-width: 960px;
  margin: 0.5rem auto 0;
  padding: 0 1rem;
  display: flex;
  gap: 0.5rem;
}

.tab-button {
  flex: 1;
  border: none;
  border-bottom: 2px solid transparent;
  background-color: transparent;
  padding: 0.6rem 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  color: #666;
}

.tab-button[aria-selected="true"] {
  color: #111827;
  border-color: #2563eb;
  background-color: #e5efff;
  border-radius: 0.5rem 0.5rem 0 0;
}

/* --------------------------------
 * メイン
 * -------------------------------- */

#main-content {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.75rem 1rem 2.5rem;
}

/* --------------------------------
 * タブ1：フィルター
 * -------------------------------- */

#tool-filters {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  padding: 0.75rem;
  background-color: #ffffff;
  border-radius: 0.75rem;
  border: 1px solid #e5e7eb;
}

.filter-group label {
  font-size: 0.8rem;
  color: #6b7280;
}

#tool-filters select,
#tool-filters input[type="search"] {
  width: 100%;
  padding: 0.35rem 0.5rem;
  border-radius: 0.4rem;
  border: 1px solid #d1d5db;
  font-size: 0.9rem;
}

.filter-search input[type="search"] {
  background-color: #f9fafb;
}

/* ================================
 * ツールカード（デザイン強化版）
 * ================================ */

#tool-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

/* --- カード本体 --- */
.tool-card {
  background-color: #ffffff;
  border-radius: 0.875rem;
  border: 1px solid #e5e7eb;
  padding: 1rem 1.1rem;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: box-shadow 0.18s ease, transform 0.18s ease;
}

.tool-card:hover {
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.1);
  transform: translateY(-2px);
}

/* --- ヘッダー部（Day + タイトル）--- */
.tool-card-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.tool-day {
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 700;
  color: #4b5563;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background-color: #e5e7eb;
  letter-spacing: 0.02em;
}

.tool-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #111827;
  line-height: 1.3;
}

/* --- サブタイトル --- */
.tool-subtitle {
  font-size: 0.85rem;
  color: #4b5563;
  line-height: 1.5;
}

/* --- 説明文（line-clamp対応）--- */
.tool-description {
  font-size: 0.85rem;
  color: #374151;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* --- メタ情報（難易度・カテゴリ）--- */
.tool-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.2rem;
}

.tool-difficulty {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background-color: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1d4ed8;
  font-size: 0.75rem;
  font-weight: 600;
}

.tool-categories {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background-color: #f3f4f6;
  border: 1px solid #e5e7eb;
  color: #374151;
  font-size: 0.75rem;
  font-weight: 500;
}

/* --- フッター（ボタン群）--- */
.tool-footer {
  margin-top: auto;
  padding-top: 0.6rem;
  border-top: 1px solid #f3f4f6;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

/* ボタングループ（デモ + GitHub）*/
.tool-footer .tool-button {
  padding: 0.4rem 0.85rem;
  border-radius: 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid #2563eb;
  background-color: #2563eb;
  color: #fff;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease;
}

.tool-footer .tool-button:hover {
  background-color: #1d4ed8;
  transform: translateY(-1px);
}

.tool-footer .tool-button:active {
  transform: translateY(0);
}

.tool-footer .tool-button.secondary {
  background-color: #fff;
  border-color: #d1d5db;
  color: #374151;
}

.tool-footer .tool-button.secondary:hover {
  background-color: #f9fafb;
  border-color: #9ca3af;
}

/* 進捗ボタン */
.tool-progress-button {
  margin-left: auto;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.1s ease;
}

.tool-progress-button:hover {
  filter: brightness(0.95);
  transform: translateY(-1px);
}

.tool-progress-button:active {
  transform: translateY(0);
}

/* 進捗状態別の色分け */
.tool-progress-button.progress-0 {
  background-color: #f3f4f6;
  border-color: #d1d5db;
  color: #6b7280;
}

.tool-progress-button.progress-1 {
  background-color: #dbeafe;
  border-color: #93c5fd;
  color: #1d4ed8;
}

.tool-progress-button.progress-2 {
  background-color: #fef3c7;
  border-color: #fcd34d;
  color: #92400e;
}

.tool-progress-button.progress-3 {
  background-color: #d1fae5;
  border-color: #6ee7b7;
  color: #065f46;
}

/* ================================
 * ダッシュボード
 * ================================ */

#tab-dashboard section {
  background-color: #ffffff;
  border-radius: 0.75rem;
  border: 1px solid #e5e7eb;
  padding: 0.75rem 0.9rem;
  margin-bottom: 0.75rem;
}

#tab-dashboard h2 {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
}

#overall-chart-container {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

/* 円グラフ本体 */
.pie-chart {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: conic-gradient(#d1d5db 0% 100%); /* デフォルト（JSで上書き） */
  position: relative;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.1);
}

/* 中央の穴（ドーナツ風） */
.pie-chart::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background-color: #ffffff;
  border-radius: 50%;
}

/* 凡例 */
.pie-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1rem;
  font-size: 0.75rem;
  color: #374151;
}

.pie-legend-item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.pie-legend-color {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  flex-shrink: 0;
}

.pie-legend-color.color-n0 { background-color: #d1d5db; }
.pie-legend-color.color-n1 { background-color: #3b82f6; }
.pie-legend-color.color-n2 { background-color: #f59e0b; }
.pie-legend-color.color-n3 { background-color: #10b981; }

#share-on-x {
  padding: 0.35rem 0.8rem;
  border-radius: 0.5rem;
  border: 1px solid #0f172a;
  background-color: #0f172a;
  color: #ffffff;
  font-size: 0.8rem;
  cursor: pointer;
}

#share-on-x:hover {
  filter: brightness(1.05);
}

#reset-all-progress {
  padding: 0.3rem 0.7rem;
  border-radius: 0.5rem;
  border: 1px solid #ef4444;
  background-color: #ffffff;
  color: #b91c1c;
  font-size: 0.8rem;
  cursor: pointer;
}

#reset-all-progress:hover {
  background-color: #fef2f2;
}

/* ================================
 * カテゴリ別進捗（進捗バー付きカード）
 * ================================ */

#category-progress-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

/* カテゴリカード */
.category-progress-item {
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 0.625rem;
  padding: 0.75rem 1rem;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05);
}

/* カテゴリ名 */
.category-progress-title {
  font-weight: 600;
  font-size: 0.9rem;
  color: #111827;
  margin-bottom: 0.5rem;
}

/* 進捗バー（コンテナ） */
.category-progress-bar {
  display: flex;
  height: 8px;
  border-radius: 999px;
  overflow: hidden;
  background-color: #e5e7eb;
  margin-bottom: 0.5rem;
}

/* バー各セグメント */
.category-progress-bar .bar-n0 {
  background-color: #d1d5db; /* グレー: 未着手 */
}

.category-progress-bar .bar-n1 {
  background-color: #3b82f6; /* 青: 学習中 */
}

.category-progress-bar .bar-n2 {
  background-color: #f59e0b; /* オレンジ: 一周完了 */
}

.category-progress-bar .bar-n3 {
  background-color: #10b981; /* 緑: 定着済み */
}

/* 数値テキスト */
.category-progress-detail {
  font-size: 0.75rem;
  color: #6b7280;
  line-height: 1.4;
}

/* --------------------------------
 * フッター
 * -------------------------------- */

#site-footer {
  border-top: 1px solid #e5e7eb;
  background-color: #f9fafb;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: space-between;
  font-size: 0.8rem;
  color: #6b7280;
}

/* --------------------------------
 * ヘルプモーダル（hidden対応）
 * -------------------------------- */

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0,0,0,0.45);
  justify-content: center;
  align-items: center;
  padding: 1rem;
}

/* hidden のときは必ず非表示 */
.modal[hidden] {
  display: none !important;
}

/* 表示されるときだけ flex */
.modal:not([hidden]) {
  display: flex;
}

.modal-content {
  background: #fff;
  max-width: 600px;
  width: 100%;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
  padding: 1.5rem;
  border-radius: 0.75rem;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: #fff;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
}

/* ================================
 * PC向け調整（768px以上）
 * ================================ */

@media (min-width: 768px) {
  #tool-filters {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr) minmax(0, 1.4fr);
    align-items: end;
  }

  /* ツールカードのグリッド：PC幅では2〜3列 */
  #tool-list {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
  }

  /* PC幅でのカード調整 */
  .tool-card {
    padding: 1.1rem 1.25rem;
  }

  .tool-title {
    font-size: 1.15rem;
  }

  /* PC幅でのフッターボタン配置 */
  .tool-footer {
    flex-wrap: nowrap;
  }

  /* PC幅でのボタンコンパクト化 */
  .tool-footer .tool-button {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
  }

  .tool-progress-button {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
  }

  /* カテゴリ別進捗：PC幅では2列 */
  #category-progress-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}