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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333;
  background: #f5f7fa;
  min-height: 100vh;
}

/* ===========================
   Header
   =========================== */
header {
  background: #1a1a2e;
  color: white;
  padding: 0.875rem 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.header-inner {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.back-link {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.85rem;
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
  padding: 0 0.25rem;
  transition: color 0.2s;
}

.back-link:hover {
  color: white;
}

.header-title h1 {
  font-size: 1.2rem;
  font-weight: 700;
}

.subtitle {
  font-size: 0.78rem;
  opacity: 0.75;
}

/* ===========================
   Main Layout
   =========================== */
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 1rem;
}

/* ===========================
   AdSense units
   =========================== */
.ad-unit {
  margin: 1.25rem 0;
}

/* ===========================
   Today Summary
   =========================== */
.today-summary {
  background: white;
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.today-date {
  font-size: 0.9rem;
  color: #555;
  font-weight: 600;
  white-space: nowrap;
}

.today-progress {
  flex: 1;
  text-align: right;
  font-size: 0.85rem;
  color: #555;
}

.today-progress span {
  font-size: 1.1rem;
  font-weight: 700;
  color: #333;
}

.progress-bar-wrap {
  height: 6px;
  background: #e0e0e0;
  border-radius: 3px;
  margin-top: 0.375rem;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #4CAF50, #81C784);
  border-radius: 3px;
  transition: width 0.4s ease;
}

/* ===========================
   Section Shared
   =========================== */
.tool-section {
  background: white;
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  margin-bottom: 1rem;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.section-header h2 {
  font-size: 1rem;
  font-weight: 700;
  color: #1a1a2e;
}

/* ===========================
   Habit List
   =========================== */
.habit-list {
  list-style: none;
}

.habit-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 0;
  border-bottom: 1px solid #f0f0f0;
  position: relative;
}

.habit-item:last-child {
  border-bottom: none;
}

/* チェックボタン: タッチターゲット56px以上 */
.habit-check-btn {
  width: 56px;
  height: 56px;
  min-width: 56px;
  border-radius: 50%;
  border: 2.5px solid #ccc;
  background: white;
  font-size: 1.4rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}

.habit-check-btn.done {
  border-color: transparent;
  background: var(--habit-color, #4CAF50);
  color: white;
}

.habit-check-btn:not(.done):hover {
  border-color: var(--habit-color, #4CAF50);
  background: rgba(76,175,80,0.05);
}

/* 習慣情報 */
.habit-info {
  flex: 1;
  min-width: 0;
}

.habit-name-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.habit-icon {
  font-size: 1.3rem;
  line-height: 1;
}

.habit-name {
  font-size: 1rem;
  font-weight: 600;
  color: #222;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.habit-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.25rem;
  flex-wrap: wrap;
}

.streak-badge {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: #FF6F00;
}

.streak-badge .flame {
  font-size: 0.9rem;
}

.streak-best {
  font-size: 0.75rem;
  color: #888;
}

.freq-label {
  font-size: 0.75rem;
  color: #aaa;
  background: #f5f5f5;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

/* 週間カレンダー（7日） */
.week-calendar {
  display: flex;
  gap: 3px;
  margin-top: 0.5rem;
}

.week-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.week-day-label {
  font-size: 0.6rem;
  color: #aaa;
}

.week-day-cell {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 600;
}

.week-day-cell.achieved {
  background: var(--habit-color, #4CAF50);
  color: white;
}

.week-day-cell.missed {
  background: #f0f0f0;
  color: #ccc;
}

.week-day-cell.today {
  outline: 2px solid var(--habit-color, #4CAF50);
  outline-offset: 1px;
}

/* 習慣アクションボタン群 */
.habit-actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex-shrink: 0;
}

.habit-action-btn {
  width: 44px;
  height: 44px;
  border: 1px solid #e0e0e0;
  background: white;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  color: #666;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.habit-action-btn:hover {
  background: #f5f5f5;
}

.habit-action-btn.edit-btn {
  font-size: 0.75rem;
}

/* Empty state */
.empty-state {
  text-align: center;
  color: #888;
  padding: 2.5rem 1rem;
  font-size: 0.9rem;
  line-height: 1.8;
  background: #f9fafb;
  border-radius: 10px;
  border: 2px dashed #e0e0e0;
}

/* ===========================
   Add Habit Button
   =========================== */
.btn-add-habit {
  display: block;
  width: 100%;
  padding: 0.9rem;
  font-size: 1rem;
  font-weight: 700;
  background: #1a1a2e;
  color: white;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  min-height: 56px;
  margin-bottom: 1rem;
  -webkit-tap-highlight-color: transparent;
}

.btn-add-habit:hover {
  background: #2d2d52;
}

.btn-add-habit:active {
  transform: scale(0.98);
}

/* ===========================
   Heatmap
   =========================== */
.heatmap-section .section-header {
  flex-wrap: wrap;
  gap: 0.5rem;
}

.heatmap-section select {
  font-size: 0.85rem;
  padding: 0.3rem 0.5rem;
  border: 1px solid #ddd;
  border-radius: 6px;
  background: white;
  color: #333;
  cursor: pointer;
}

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
  color: #888;
}

.heatmap-container {
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.heatmap-grid {
  display: grid;
  grid-template-rows: repeat(7, 14px);
  grid-auto-flow: column;
  gap: 3px;
  width: max-content;
}

.heatmap-cell {
  width: 14px;
  height: 14px;
  border-radius: 2px;
}

.heatmap-cell.level-0 { background: #ebedf0; }
.heatmap-cell.level-1 { background: #c6e48b; }
.heatmap-cell.level-2 { background: #7bc96f; }
.heatmap-cell.level-3 { background: #239a3b; }
.heatmap-cell.level-4 { background: #196127; }

.heatmap-day-labels {
  display: grid;
  grid-template-rows: repeat(7, 14px);
  gap: 3px;
  margin-right: 4px;
  flex-shrink: 0;
}

.heatmap-day-label {
  font-size: 0.6rem;
  color: #aaa;
  display: flex;
  align-items: center;
  height: 14px;
}

.heatmap-wrap {
  display: flex;
}

.heatmap-month-labels {
  display: flex;
  gap: 3px;
  padding-left: 32px;
  margin-bottom: 4px;
}

.heatmap-month-label {
  font-size: 0.65rem;
  color: #aaa;
}

/* ===========================
   Stats
   =========================== */
.stats-section h2 {
  font-size: 1rem;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 1rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.stat-card {
  background: #f8f9fa;
  border-radius: 10px;
  padding: 1rem;
  text-align: center;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: #1a1a2e;
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: #888;
  margin-top: 0.25rem;
}

.stat-emoji {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

/* ===========================
   How-to Section
   =========================== */
.howto-section {
  background: white;
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  margin-bottom: 1rem;
}

.howto-section h2 {
  font-size: 1rem;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 0.75rem;
  margin-top: 1.25rem;
}

.howto-section h2:first-child {
  margin-top: 0;
}

.howto-section ol {
  padding-left: 1.25rem;
  font-size: 0.9rem;
  color: #555;
}

.howto-section li {
  margin-bottom: 0.5rem;
}

.howto-section p {
  font-size: 0.9rem;
  color: #555;
  line-height: 1.7;
}

/* ===========================
   Footer
   =========================== */
footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.85rem;
  color: #888;
}

footer a {
  color: #666;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ===========================
   Modal
   =========================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
}

.modal {
  background: white;
  width: 100%;
  max-width: 480px;
  border-radius: 20px 20px 0 0;
  padding: 1.5rem 1.25rem;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.25s ease;
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
}

.modal-close {
  width: 44px;
  height: 44px;
  border: none;
  background: #f0f0f0;
  border-radius: 50%;
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #555;
  -webkit-tap-highlight-color: transparent;
}

#habit-form label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: #555;
  margin-top: 1rem;
  margin-bottom: 0.4rem;
}

#habit-form .required {
  color: #e53935;
}

#habit-form input[type="text"] {
  width: 100%;
  padding: 0.7rem 0.875rem;
  font-size: 1rem;
  border: 1.5px solid #ddd;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.2s;
}

#habit-form input[type="text"]:focus {
  border-color: #4CAF50;
}

/* Emoji Picker */
.emoji-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.emoji-btn {
  width: 44px;
  height: 44px;
  border: 2px solid #e0e0e0;
  background: white;
  border-radius: 8px;
  font-size: 1.2rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.emoji-btn.selected {
  border-color: #4CAF50;
  background: #f0faf0;
}

/* Color Picker */
.color-picker {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.color-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 3px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.color-btn.selected {
  border-color: #333;
  transform: scale(1.15);
}

/* Frequency Row */
.freq-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.freq-row select {
  flex: 1;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  border: 1.5px solid #ddd;
  border-radius: 8px;
  background: white;
  min-height: 44px;
}

#freq-count-wrap {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.95rem;
}

#habit-freq-count {
  width: 56px;
  padding: 0.6rem;
  font-size: 1rem;
  border: 1.5px solid #ddd;
  border-radius: 8px;
  text-align: center;
  min-height: 44px;
}

/* Modal Actions */
.modal-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.btn-primary {
  flex: 1;
  padding: 0.875rem;
  font-size: 1rem;
  font-weight: 700;
  background: #1a1a2e;
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  min-height: 56px;
  transition: background 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.btn-primary:hover {
  background: #2d2d52;
}

.btn-secondary {
  padding: 0.875rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  background: white;
  color: #e53935;
  border: 1.5px solid #e53935;
  border-radius: 10px;
  cursor: pointer;
  min-height: 56px;
  transition: background 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.btn-secondary:hover {
  background: #fff5f5;
}

/* ===========================
   Responsive — Desktop
   =========================== */
@media (min-width: 640px) {
  .header-title h1 {
    font-size: 1.4rem;
  }

  main {
    padding: 1.5rem 2rem;
  }

  .modal {
    border-radius: 16px;
    margin: auto;
  }

  .modal-overlay {
    align-items: center;
  }

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

  .habit-item {
    gap: 1rem;
  }
}

/* ===========================
   Drag & Drop
   =========================== */
.habit-item.dragging {
  opacity: 0.4;
}

.habit-item.drag-over {
  border-top: 2px solid #4CAF50;
}