:root {
  --equal-love: #ea6c81;
  --equal-love-rgb: 234, 108, 129;
  --not-equal-me: #79ccbd;
  --not-equal-me-rgb: 121, 204, 189;
  --nearly-equal-joy: #ffdf6a;
  --nearly-equal-joy-rgb: 255, 223, 106;
  --unknown: #999999;
  --unknown-rgb: 153, 153, 153;

  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-hover: #f0f2f8;

  --text-primary: #2d3748;
  --text-secondary: #718096;
  --text-light: #a0aec0;

  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);

  --border-radius: 16px;
  --border-radius-sm: 10px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

/* Header */
.header {
  background: var(--bg-secondary);
  padding: 2rem 1rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.header h1 .logo-love {
  color: var(--equal-love);
}

.header h1 .logo-me {
  color: var(--not-equal-me);
}

.header h1 .logo-joy {
  color: var(--nearly-equal-joy);
}

.header p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Top Group Filters */
.filter-container {
  padding: 1rem;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.filter-btn {
  padding: 0.6rem 1.2rem;
  border: 2px solid var(--border-color);
  border-radius: 50px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-btn:hover {
  border-color: var(--text-light);
  background: var(--bg-hover);
}

.filter-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.filter-btn.active {
  color: white;
  border-color: transparent;
}

.filter-btn[data-group="all"].active {
  background: linear-gradient(135deg, var(--equal-love), var(--not-equal-me), var(--nearly-equal-joy));
}

.filter-btn[data-group="equal-love"].active {
  background: var(--equal-love);
}

.filter-btn[data-group="not-equal-me"].active {
  background: var(--not-equal-me);
}

.filter-btn[data-group="nearly-equal-joy"].active {
  background: var(--nearly-equal-joy);
  color: var(--text-primary);
}

.filter-btn .count {
  background: rgba(0, 0, 0, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: 20px;
  font-size: 0.75rem;
}

.filter-btn.active .count {
  background: rgba(255, 255, 255, 0.28);
}

.filter-btn[data-group="nearly-equal-joy"].active .count {
  background: rgba(0, 0, 0, 0.15);
}

/* Main */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Calendar */
.calendar-shell {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.calendar-toolbar {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.toolbar-top,
.toolbar-bottom {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

.toolbar-bottom {
  align-items: center;
}

.calendar-title h2 {
  font-size: 1.35rem;
  line-height: 1.3;
  margin-bottom: 0.3rem;
}

.calendar-title p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Month nav */
.month-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.month-nav-btn {
  padding: 0.72rem 1.3rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
}

.month-nav-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-light);
}

.month-nav-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Filter toolbar inside calendar toolbar */
.filters-toolbar {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1 1 760px;
  min-width: 0;
}

.group-filter-list,
.category-filter-list {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.45rem;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding-bottom: 0.1rem;
}

.group-filter-list::-webkit-scrollbar,
.category-filter-list::-webkit-scrollbar {
  display: none;
}

.group-filter-list .filter-btn,
.category-filter-btn {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 0.34rem 0.72rem;
  border-width: 1px;
  font-size: 0.73rem;
  gap: 0.35rem;
}

.group-filter-list .filter-btn .count,
.category-filter-btn .count {
  padding: 0.08rem 0.35rem;
  font-size: 0.66rem;
}

.category-filter-btn.active {
  background: #eef3f8;
  color: var(--text-primary);
  border-color: #d8e2ee;
}

.category-filter-btn.active .count {
  background: rgba(45, 55, 72, 0.08);
  color: var(--text-primary);
}

/* Month pills */
.month-pills {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: flex-end;
  margin-left: auto;
  flex-shrink: 0;
}

.summary-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.82rem;
  white-space: nowrap;
}

.summary-pill strong {
  color: var(--text-primary);
  font-size: 0.95rem;
}

/* Calendar board */
.calendar-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.calendar-board {
  min-width: 980px;
}

.weekday-row,
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
}

.weekday-row {
  background: var(--bg-hover);
  border-bottom: 1px solid var(--border-color);
}

.weekday {
  text-align: center;
  padding: 0.9rem 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}

.weekday:first-child {
  color: var(--equal-love);
}

.weekday:last-child {
  color: #5b8def;
}

.calendar-grid {
  background: var(--border-color);
  gap: 1px;
}

.calendar-day {
  background: var(--bg-secondary);
  min-height: 168px;
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  position: relative;
  cursor: pointer;
  transition: all 0.2s ease;
  outline: none;
  z-index: 1;
}

.calendar-day::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--cell-accent, transparent);
}

.calendar-day:hover {
  transform: translateY(-1px);
  z-index: 2;
  box-shadow: var(--shadow-sm);
}

.calendar-day:focus-visible {
  z-index: 4;
  box-shadow: var(--shadow-sm);
}

.calendar-day.selected {
  z-index: 4;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.calendar-day.selected:hover {
  box-shadow: var(--shadow-lg);
}

.calendar-day.blank {
  background: #f5f7fb;
  min-height: 168px;
  cursor: default;
}

.calendar-day.blank::before {
  display: none;
}

.calendar-day.blank:hover {
  transform: none;
  box-shadow: none;
}

.calendar-day.filtered-empty {
  background: var(--bg-secondary);
}

.day-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
}

.day-number-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
}

.day-number-line {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.day-number {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
  color: var(--text-primary);
}

.today-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.14rem 0.45rem;
  border-radius: 999px;
  background: rgba(var(--equal-love-rgb), 0.12);
  color: var(--equal-love);
  font-size: 0.68rem;
  font-weight: 700;
  line-height: 1;
  border: 1px solid rgba(var(--equal-love-rgb), 0.22);
}

.day-weekday {
  font-size: 0.72rem;
  color: var(--text-light);
}

.day-count {
  min-width: 28px;
  height: 28px;
  padding: 0 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: var(--bg-hover);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Preview list */
.event-preview-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.mini-event {
  display: flex;
  align-items: flex-start;
  gap: 0.45rem;
  padding: 0.42rem 0.5rem;
  border-radius: 10px;
  font-size: 0.73rem;
  line-height: 1.35;
  border: 1px solid transparent;
}

.mini-event.equal-love {
  background: rgba(var(--equal-love-rgb), 0.1);
  color: var(--equal-love);
}

.mini-event.not-equal-me {
  background: rgba(var(--not-equal-me-rgb), 0.12);
  color: #2c8c7d;
}

.mini-event.nearly-equal-joy {
  background: rgba(var(--nearly-equal-joy-rgb), 0.2);
  color: #9a7b00;
}

.mini-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 0.32rem;
  background: currentColor;
}

.mini-event-text {
  display: -webkit-box;
  line-clamp: 2;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--text-primary);
}

.more-note {
  font-size: 0.74rem;
  color: var(--text-light);
  padding-left: 0.15rem;
}

.day-empty {
  margin-top: auto;
  font-size: 0.76rem;
  color: var(--text-light);
}

/* Detail */
.detail-card {
  margin-top: 1.5rem;
  background: var(--bg-card);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.detail-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.detail-title-wrap h3 {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.2rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.detail-title-wrap p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.detail-body {
  padding: 1.5rem;
}

/* Event list */
.event-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1rem;
}

.event-card {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: all 0.2s ease;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.event-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.event-card.equal-love:hover {
  box-shadow: 0 8px 30px rgba(var(--equal-love-rgb), 0.2);
}

.event-card.not-equal-me:hover {
  box-shadow: 0 8px 30px rgba(var(--not-equal-me-rgb), 0.25);
}

.event-card.nearly-equal-joy:hover {
  box-shadow: 0 8px 30px rgba(var(--nearly-equal-joy-rgb), 0.3);
}

.event-card a {
  display: block;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
}

.event-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.group-badge,
.category-badge {
  padding: 0.35rem 0.9rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}

.group-badge.equal-love {
  background: rgba(var(--equal-love-rgb), 0.15);
  color: var(--equal-love);
}

.group-badge.not-equal-me {
  background: rgba(var(--not-equal-me-rgb), 0.2);
  color: var(--not-equal-me);
}

.group-badge.nearly-equal-joy {
  background: rgba(var(--nearly-equal-joy-rgb), 0.25);
  color: #8f7300;
}

.category-badge {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.event-date {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-left: auto;
}

.event-name {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.6;
  color: var(--text-primary);
  display: -webkit-box;
  line-clamp: 3;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 4.8em;
}

.event-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.detail-link {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: color 0.2s;
}

.event-card:hover .detail-link {
  color: var(--equal-love);
}

.event-card.not-equal-me:hover .detail-link {
  color: var(--not-equal-me);
}

.event-card.nearly-equal-joy:hover .detail-link {
  color: #a38300;
}

.detail-link svg {
  width: 16px;
  height: 16px;
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  gap: 1rem;
  color: var(--text-secondary);
}

.empty-state h4 {
  font-size: 1.05rem;
  color: var(--text-primary);
}

.empty-state p {
  font-size: 0.9rem;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 3px solid var(--border-color);
  border-top-color: var(--equal-love);
  border-right-color: var(--not-equal-me);
  border-bottom-color: var(--nearly-equal-joy);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Footer */
.footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-light);
  font-size: 0.8rem;
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.footer-credit {
  color: var(--text-light);
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-hover);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8rem;
  transition: all 0.2s ease;
}

.footer-link:hover {
  background: var(--bg-secondary);
  border-color: var(--text-light);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.footer-link svg {
  flex-shrink: 0;
}

/* Scroll top */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-md);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--equal-love);
  border-color: var(--equal-love);
}

.scroll-top svg {
  width: 22px;
  height: 22px;
}

/* Responsive */
@media (max-width: 900px) {
  .toolbar-bottom {
    align-items: flex-start;
  }

  .filters-toolbar {
    flex-basis: 100%;
  }

  .month-pills {
    margin-left: 0;
    justify-content: flex-start;
  }
}

@media (max-width: 768px) {
  .header {
    padding: 1.5rem 1rem;
  }

  .header h1 {
    font-size: 1.3rem;
  }

  .container {
    padding: 1rem;
  }

  .calendar-toolbar,
  .detail-header,
  .detail-body {
    padding: 1rem;
  }

  .calendar-title h2 {
    font-size: 1.15rem;
  }

  .month-actions {
    justify-content: flex-start;
  }

  .filter-btn {
    padding: 0.5rem 0.9rem;
    font-size: 0.8rem;
  }

  .group-filter-list .filter-btn {
    padding: 0.48rem 0.85rem;
    font-size: 0.78rem;
  }

  .category-filter-btn {
    padding: 0.3rem 0.62rem;
    font-size: 0.7rem;
    gap: 0.3rem;
  }

  .category-filter-btn .count {
    padding: 0.06rem 0.3rem;
    font-size: 0.62rem;
  }

  .calendar-board {
    min-width: 860px;
  }

  .calendar-day,
  .calendar-day.blank {
    min-height: 150px;
  }

  .event-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .calendar-board {
    min-width: 780px;
  }

  .event-card a {
    padding: 1.2rem;
  }

  .scroll-top {
    right: 1rem;
    bottom: 1rem;
  }
}