:root {
  --c-primary: #0e7490;      /* 落ち着いたティール */
  --c-primary-dark: #155e75;
  --c-primary-pale: #e0f2f7;
  --c-bg: #f4f7f8;
  --c-surface: #ffffff;
  --c-text: #1f2a2e;
  --c-text-sub: #5b6b70;
  --c-border: #dbe4e6;
  --c-star: #f59e0b;
  --c-done: #16a34a;
  --badge-hip: #7c3aed;
  --badge-shoulder: #0369a1;
  --badge-knee: #b45309;
  --badge-spine: #be185d;
  --nav-h: 60px;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 40, 50, 0.08), 0 1px 2px rgba(15, 40, 50, 0.06);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom));
}

/* ---------- ヘッダー ---------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 16px 8px;
  background: var(--c-primary);
  color: #fff;
}
.app-title { margin: 0; font-size: 1.05rem; font-weight: 700; letter-spacing: 0.02em; }
.result-count { font-size: 0.85rem; opacity: 0.95; white-space: nowrap; }

/* ---------- フィルタ領域 ---------- */
.filter-area {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--c-primary);
  padding: 4px 12px 12px;
  border-radius: 0 0 16px 16px;
  box-shadow: var(--shadow);
}

.region-tabs {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 8px;
  scrollbar-width: none;
}
.region-tabs::-webkit-scrollbar { display: none; }
.region-tab {
  flex: 1 0 auto;
  min-height: 40px;
  padding: 6px 14px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
.region-tab.is-active { background: #fff; color: var(--c-primary-dark); }

.search-row { display: flex; flex-direction: column; gap: 8px; }

.search-box { position: relative; }
.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--c-text-sub);
  pointer-events: none;
}
#search-input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px 10px 40px;
  border: none;
  border-radius: var(--radius);
  font-size: 16px; /* iOSズーム防止 */
  background: var(--c-surface);
  color: var(--c-text);
}
#search-input:focus { outline: 2px solid #fff; outline-offset: 1px; }

#category-select {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  background: var(--c-surface);
  color: var(--c-text);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235b6b70' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
}

.toggle-row { display: flex; gap: 8px; margin-top: 8px; }
.toggle-chip {
  flex: 1;
  min-height: 40px;
  padding: 6px 10px;
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  border-radius: 999px;
  background: transparent;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}
.toggle-chip[aria-pressed="true"] { background: #fff; color: var(--c-primary-dark); border-color: #fff; }

/* ---------- カード一覧 ---------- */
.card-list {
  list-style: none;
  margin: 0;
  padding: 12px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.card {
  display: flex;
  align-items: stretch;
  gap: 4px;
  background: var(--c-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card-main {
  flex: 1;
  min-width: 0;
  padding: 12px 4px 12px 14px;
  border: none;
  background: none;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
}
.card-tags { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-bottom: 4px; }
.region-badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
}
.region-badge[data-region="股関節"] { background: var(--badge-hip); }
.region-badge[data-region="肩"] { background: var(--badge-shoulder); }
.region-badge[data-region="膝"] { background: var(--badge-knee); }
.region-badge[data-region="脊椎"] { background: var(--badge-spine); }
.card-category { font-size: 0.75rem; color: var(--c-text-sub); }
.card-name { margin: 0 0 4px; font-size: 0.98rem; font-weight: 700; line-height: 1.4; }
.card-stats { font-size: 0.8rem; color: var(--c-text-sub); }

.card-actions {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4px 6px;
}
.icon-btn {
  width: 44px;
  height: 44px;
  border: none;
  background: none;
  font-size: 1.3rem;
  color: #c3ced1;
  cursor: pointer;
  line-height: 1;
}
.icon-btn.is-on.fav-btn { color: var(--c-star); }
.icon-btn.is-on.done-btn { color: var(--c-done); }

.empty-message {
  padding: 40px 16px;
  text-align: center;
  color: var(--c-text-sub);
  font-size: 0.92rem;
}

.section-title { margin: 16px 16px 4px; font-size: 1rem; color: var(--c-text-sub); }

/* ---------- 下部ナビ ---------- */
.bottom-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  display: flex;
  height: calc(var(--nav-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
}
.nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  border: none;
  background: none;
  color: var(--c-text-sub);
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
}
.nav-btn svg { width: 22px; height: 22px; fill: currentColor; }
.nav-btn.is-active { color: var(--c-primary); }

/* ---------- 詳細モーダル ---------- */
.modal { position: fixed; inset: 0; z-index: 30; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(15, 35, 45, 0.5); }
.modal-panel {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  max-height: 92dvh;
  background: var(--c-surface);
  border-radius: 16px 16px 0 0;
  display: flex;
  flex-direction: column;
  animation: slide-up 0.22s ease-out;
}
@keyframes slide-up {
  from { transform: translateY(24px); opacity: 0.6; }
  to { transform: translateY(0); opacity: 1; }
}
.modal-head {
  display: flex;
  justify-content: flex-end;
  padding: 8px 8px 0;
}
.modal-close {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--c-bg);
  color: var(--c-text-sub);
  font-size: 1rem;
  cursor: pointer;
}
.modal-body {
  overflow-y: auto;
  padding: 0 18px calc(24px + env(safe-area-inset-bottom));
  -webkit-overflow-scrolling: touch;
}
.detail-title { margin: 6px 0 10px; font-size: 1.15rem; line-height: 1.45; }
.detail-section { margin-bottom: 14px; }
.detail-label {
  display: block;
  margin-bottom: 2px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-primary-dark);
  letter-spacing: 0.04em;
}
.detail-text { margin: 0; font-size: 0.92rem; }
.detail-stats {
  display: flex;
  gap: 10px;
  margin-bottom: 6px;
}
.stat-box {
  flex: 1;
  padding: 8px 10px;
  border-radius: 10px;
  background: var(--c-primary-pale);
  text-align: center;
}
.stat-box .stat-label { display: block; font-size: 0.72rem; color: var(--c-primary-dark); font-weight: 700; }
.stat-box .stat-value { font-size: 0.95rem; font-weight: 700; }
.accuracy-note { margin: 4px 0 0; font-size: 0.8rem; color: var(--c-text-sub); }

.detail-toggles { display: flex; gap: 10px; margin: 16px 0; }
.detail-toggle {
  flex: 1;
  min-height: 48px;
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--c-text-sub);
  cursor: pointer;
}
.detail-toggle.is-on.fav-btn { border-color: var(--c-star); color: var(--c-star); background: #fffbeb; }
.detail-toggle.is-on.done-btn { border-color: var(--c-done); color: var(--c-done); background: #f0fdf4; }

.video-wrap { margin-top: 6px; }
.video-facade {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  border-radius: 10px;
  background: #10222b;
  color: #fff;
  cursor: pointer;
  font: inherit;
}
.video-facade .play-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--c-primary);
  margin-bottom: 8px;
}
.video-facade .play-circle svg { width: 22px; height: 22px; fill: #fff; margin-left: 3px; }
.video-facade span.hint { display: block; font-size: 0.82rem; opacity: 0.9; }
.video-wrap iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  border-radius: 10px;
}

.detail-reference { font-size: 0.8rem; color: var(--c-text-sub); }

/* ---------- タブレット・PC ---------- */
@media (min-width: 640px) {
  .search-row { flex-direction: row; }
  .search-box { flex: 2; }
  #category-select { flex: 1; }
  .card-list { grid-template-columns: repeat(2, 1fr); max-width: 900px; margin: 0 auto; }
  .filter-area, .app-header { padding-left: 24px; padding-right: 24px; }
}
@media (min-width: 1024px) {
  .card-list { grid-template-columns: repeat(3, 1fr); max-width: 1200px; }
  .modal-panel {
    left: 50%;
    right: auto;
    bottom: auto;
    top: 50%;
    transform: translate(-50%, -50%);
    width: min(680px, 92vw);
    max-height: 86vh;
    border-radius: 16px;
  }
  @keyframes slide-up {
    from { transform: translate(-50%, calc(-50% + 16px)); opacity: 0.6; }
    to { transform: translate(-50%, -50%); opacity: 1; }
  }
}