:root {
  --bg-1: #3b2415;
  --bg-2: #5a3820;
  --cream: #fff3df;
  --gold: #ffc857;
  --gold-dark: #e0a52e;
  --brown: #7a4a24;
  --brown-dark: #4a2c14;
  --perfect: #ffd166;
  --good: #7ee08a;
  --ok: #7fc8f8;
  --miss: #ff6b6b;
  --panel-bg: rgba(255, 243, 223, 0.97);
  --card-bg: #fffaf0;
  --text-dark: #3b2415;
  --radius: 14px;
  --shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow-x: hidden;
  font-family: 'Hiragino Maru Gothic ProN', 'Segoe UI', 'Yu Gothic', system-ui, sans-serif;
  background: linear-gradient(160deg, var(--bg-1), var(--bg-2));
  color: var(--text-dark);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

button { font-family: inherit; cursor: pointer; border: none; }

.hidden { display: none !important; }

/* ===== ヘッダー ===== */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: linear-gradient(180deg, var(--brown-dark), var(--brown));
  color: var(--cream);
  box-shadow: var(--shadow);
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar h1 { font-size: 1.2rem; margin: 0; white-space: nowrap; }
.stats { display: flex; gap: 14px; flex-wrap: wrap; flex: 1; }
.stat { display: flex; flex-direction: column; font-size: 0.72rem; line-height: 1.2; min-width: 60px; }
.stat-label { opacity: 0.75; }
.stat span:last-child { font-weight: 700; font-size: 0.95rem; color: var(--gold); }
#stat-combo.combo-hot { color: #ff8a3d; animation: pulse 0.6s infinite alternate; }
.icon-btn {
  background: rgba(255,255,255,0.12);
  color: var(--cream);
  border-radius: 50%;
  width: 34px; height: 34px;
  font-size: 1rem;
}

/* ===== レイアウト ===== */
.layout {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding-bottom: 70px;
}

.game-area {
  padding: 10px;
}

/* ===== レーン ===== */
.lanes-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.lane {
  position: relative;
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.06);
  border-radius: 10px;
  padding: 4px;
}
.lane-track {
  position: relative;
  flex: 1;
  height: 56px;
  background: linear-gradient(90deg, rgba(0,0,0,0.25), rgba(0,0,0,0.05) 80%, rgba(255,200,87,0.15));
  border-radius: 10px;
  overflow: hidden;
  touch-action: manipulation;
}
.lane-key {
  width: 46px;
  text-align: center;
  font-size: 0.65rem;
  color: var(--cream);
  opacity: 0.7;
  flex-shrink: 0;
}
.hit-zone {
  position: absolute;
  top: 0; bottom: 0;
  width: 4px;
  background: var(--gold);
  box-shadow: 0 0 12px 3px var(--gold);
  transform: translateX(-50%);
  z-index: 2;
}
.note {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.9rem;
  filter: drop-shadow(0 2px 3px rgba(0,0,0,0.4));
  will-change: left;
  pointer-events: none;
  user-select: none;
}
.note-golden { filter: drop-shadow(0 0 8px #ffe066); }
.note-missed { opacity: 0.2; transition: opacity 0.2s; }
.note-fake {
  filter: sepia(0.75) saturate(1.4) brightness(0.62) drop-shadow(0 0 5px rgba(180, 40, 20, 0.55));
}
.note-fake-hit { animation: fakeShake 0.25s; opacity: 0.15; transition: opacity 0.2s; }
.note-fake-passed { opacity: 0; transition: opacity 0.2s; }
@keyframes fakeShake {
  0%, 100% { transform: translate(-50%, -50%); }
  25% { transform: translate(-58%, -50%); }
  75% { transform: translate(-42%, -50%); }
}

.judge-float {
  position: absolute;
  top: 6px;
  transform: translateY(0) translateX(-50%);
  font-weight: 800;
  font-size: 0.85rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  z-index: 5;
}
.judge-float-anim { animation: judgePop 0.65s ease-out forwards; }
@keyframes judgePop {
  0% { opacity: 0; transform: translateY(10px) translateX(-50%); }
  20% { opacity: 1; transform: translateY(-6px) translateX(-50%); }
  100% { opacity: 0; transform: translateY(-30px) translateX(-50%); }
}
.judge-perfect { color: var(--perfect); text-shadow: 0 0 6px rgba(255,209,102,0.8); }
.judge-good { color: var(--good); }
.judge-ok { color: var(--ok); }
.judge-miss { color: var(--miss); }
.judge-crit { font-size: 1.05rem; }
.judge-fake { color: #ff9d4d; }

.rhythm-legend {
  display: flex;
  gap: 12px;
  justify-content: center;
  font-size: 0.68rem;
  margin-top: 6px;
  color: var(--cream);
  opacity: 0.85;
  flex-wrap: wrap;
}
.rhythm-legend span::before { content: '● '; }
.leg-perfect { color: var(--perfect); }
.leg-good { color: var(--good); }
.leg-ok { color: var(--ok); }
.leg-miss { color: var(--miss); }

.fake-hint {
  text-align: center;
  font-size: 0.65rem;
  color: #ffb98a;
  opacity: 0.85;
  margin-top: 4px;
}

.bpm-banner {
  text-align: center;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 5px 10px;
  border-radius: 8px;
  margin-bottom: 6px;
  color: var(--brown-dark);
  animation: bpmSlide 0.3s ease-out;
}
.bpm-banner-high { background: linear-gradient(90deg, #ff9d4d, #ff6b6b); color: #3b1600; }
.bpm-banner-low { background: linear-gradient(90deg, #7fc8f8, #a3e0ff); color: #0a3a52; }
@keyframes bpmSlide { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }
.lanes-container.bpm-high .hit-zone { background: #ff6b6b; box-shadow: 0 0 12px 3px #ff6b6b; }
.lanes-container.bpm-low .hit-zone { background: #7fc8f8; box-shadow: 0 0 12px 3px #7fc8f8; }

/* ===== タブバー ===== */
.tabbar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  display: flex;
  background: var(--brown-dark);
  z-index: 20;
  box-shadow: 0 -3px 10px rgba(0,0,0,0.3);
}
.tab-btn {
  flex: 1;
  background: none;
  color: rgba(255,243,223,0.6);
  padding: 9px 4px;
  font-size: 0.68rem;
  border-top: 3px solid transparent;
}
.tab-btn.active {
  color: var(--gold);
  border-top-color: var(--gold);
  background: rgba(255,255,255,0.05);
}

/* ===== パネル共通 ===== */
.panel-content {
  background: var(--panel-bg);
  margin: 0 8px 8px;
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow);
}
.panel-header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.panel-header h2 { margin: 0; font-size: 1.05rem; }
.section-title { font-size: 0.9rem; margin: 14px 0 6px; color: var(--brown); }

.qty-selector { display: flex; gap: 4px; }
.qty-btn {
  background: #efe1c8; padding: 5px 10px; border-radius: 8px; font-size: 0.75rem; font-weight: 700; color: var(--brown);
}
.qty-btn.active { background: var(--gold); color: var(--brown-dark); }

.card-list { display: flex; flex-direction: column; gap: 8px; }
.card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--card-bg);
  border-radius: 10px;
  padding: 8px 10px;
  border: 1px solid rgba(122,74,36,0.15);
  transition: transform 0.15s;
}
.card.unaffordable { opacity: 0.55; }
.card.maxed { border-color: var(--gold); background: #fff7e0; }
.card-icon { font-size: 1.8rem; width: 42px; text-align: center; flex-shrink: 0; }
.card-body { flex: 1; min-width: 0; }
.card-title { font-weight: 700; font-size: 0.88rem; }
.card-count { color: var(--gold-dark); }
.card-desc { font-size: 0.72rem; color: #6b5638; margin-top: 1px; }
.card-sub { font-size: 0.68rem; color: #8a7350; margin-top: 2px; }
.buy-btn {
  background: linear-gradient(180deg, var(--gold), var(--gold-dark));
  color: var(--brown-dark);
  font-weight: 700;
  font-size: 0.72rem;
  border-radius: 8px;
  padding: 6px 10px;
  text-align: center;
  flex-shrink: 0;
  min-width: 78px;
}
.buy-btn:disabled { background: #d8cbb0; color: #998a68; }
.buy-btn small { font-weight: 400; opacity: 0.8; }
.maxed-badge {
  background: var(--gold);
  color: var(--brown-dark);
  font-size: 0.68rem;
  font-weight: 700;
  padding: 5px 9px;
  border-radius: 8px;
  flex-shrink: 0;
}
.milestone-btn {
  display: block;
  margin-top: 5px;
  background: #fff0c2;
  border: 1px dashed var(--gold-dark);
  color: var(--brown-dark);
  font-size: 0.65rem;
  padding: 3px 6px;
  border-radius: 6px;
}
.milestone-btn.disabled { opacity: 0.5; }

/* ===== 実績 ===== */
.achv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(84px, 1fr));
  gap: 8px;
}
.achv {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 8px 4px;
  text-align: center;
  border: 1px solid rgba(122,74,36,0.12);
}
.achv.locked { opacity: 0.45; }
.achv.unlocked { border-color: var(--gold); background: #fff7e0; }
.achv-icon { font-size: 1.5rem; }
.achv-name { font-size: 0.6rem; margin-top: 3px; line-height: 1.2; color: #6b5638; }

/* ===== リボーン ===== */
.reborn-summary { background: var(--card-bg); border-radius: 10px; padding: 10px 12px; font-size: 0.8rem; }
.reborn-summary p { margin: 4px 0; }
.reborn-btn {
  margin-top: 8px;
  width: 100%;
  padding: 10px;
  border-radius: 10px;
  background: linear-gradient(180deg, #ffe08a, var(--gold-dark));
  color: var(--brown-dark);
  font-weight: 800;
  font-size: 0.9rem;
}
.reborn-btn:disabled { background: #d8cbb0; color: #998a68; }

.tree-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 10px;
  overflow-x: auto;
}
.tree-col { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.tree-col-label { font-size: 0.68rem; font-weight: 700; margin-bottom: 4px; text-align: center; }
.branch-rhythm .tree-col-label { color: #2f7dd6; }
.branch-prod .tree-col-label { color: #2f9e5c; }
.branch-golden .tree-col-label { color: #cf9a1e; }
.branch-secret .tree-col-label { color: #a24fc9; }
.tree-slot { display: flex; flex-direction: column; align-items: center; width: 100%; }
.tree-connector { width: 3px; height: 12px; background: #cbb98d; }
.tree-node {
  width: 100%;
  background: #efe1c8;
  border-radius: 10px;
  padding: 6px 4px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2px;
  border: 2px solid transparent;
}
.tree-node-icon { font-size: 1.2rem; }
.tree-node-name { font-size: 0.6rem; font-weight: 700; color: var(--brown-dark); line-height: 1.2; }
.tree-node-cost { font-size: 0.6rem; color: #8a7350; }
.tree-node.locked { opacity: 0.4; }
.tree-node.available { border-color: var(--gold-dark); background: #fff2cf; }
.tree-node.available.unaffordable { opacity: 0.6; }
.tree-node.bought { background: linear-gradient(180deg, #ffe08a, var(--gold-dark)); border-color: var(--gold-dark); }

/* ===== 設定 ===== */
.settings-list { display: flex; flex-direction: column; gap: 8px; }
.setting-row { display: flex; justify-content: space-between; align-items: center; background: var(--card-bg); padding: 8px 10px; border-radius: 8px; font-size: 0.82rem; }
.stats-box { background: var(--card-bg); padding: 8px 10px; border-radius: 8px; font-size: 0.78rem; line-height: 1.7; }
.save-box { display: flex; flex-direction: column; gap: 8px; margin-top: 6px; }
.secondary-btn { background: #efe1c8; color: var(--brown-dark); padding: 8px; border-radius: 8px; font-size: 0.8rem; font-weight: 700; }
.danger-btn { background: #f3d3d3; color: #8a2c2c; padding: 8px; border-radius: 8px; font-size: 0.8rem; font-weight: 700; }
.export-area { width: 100%; height: 70px; border-radius: 8px; border: 1px solid #d8cbb0; padding: 6px; font-size: 0.7rem; resize: vertical; }

/* ===== トースト ===== */
#toast-container {
  position: fixed;
  top: 66px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  pointer-events: none;
}
.toast {
  background: rgba(59,36,21,0.95);
  color: var(--cream);
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 0.78rem;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.25s, transform 0.25s;
  box-shadow: var(--shadow);
}
.toast-show { opacity: 1; transform: translateY(0); }
.toast-achievement { background: linear-gradient(90deg, var(--gold-dark), var(--gold)); color: var(--brown-dark); font-weight: 700; }
.toast-warn { background: #8a2c2c; }

/* ===== モーダル ===== */
.modal {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 50;
  padding: 16px;
}
.modal-box {
  background: var(--panel-bg);
  border-radius: var(--radius);
  padding: 18px;
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow);
  text-align: center;
}
.modal-box-lg { max-width: 560px; text-align: left; }
.modal-box h2 { margin-top: 0; }
.modal-actions { display: flex; gap: 8px; justify-content: center; margin-top: 14px; }
.offline-gain { font-size: 1.4rem; font-weight: 800; color: var(--gold-dark); }
.changelog-list { max-height: 55vh; overflow-y: auto; }
.changelog-entry { margin-bottom: 14px; }
.changelog-version { font-weight: 800; color: var(--brown); }
.changelog-date { font-weight: 400; font-size: 0.75rem; opacity: 0.6; margin-left: 6px; }
.changelog-entry ul { margin: 4px 0 0; padding-left: 18px; font-size: 0.82rem; }
.changelog-entry li { margin-bottom: 3px; }

@keyframes pulse { from { transform: scale(1); } to { transform: scale(1.12); } }

/* ===== デスクトップ ===== */
@media (min-width: 860px) {
  .layout { padding-bottom: 20px; }
  main.layout { display: grid; grid-template-columns: 1.3fr 1fr; grid-template-rows: auto auto; gap: 10px; padding: 10px; }
  .game-area { grid-column: 1; grid-row: 1 / span 2; padding: 0; }
  .tabbar { position: static; grid-column: 2; grid-row: 1; box-shadow: none; border-radius: 12px; overflow: hidden; }
  .panel-content { grid-column: 2; grid-row: 2; margin: 0; max-height: 72vh; overflow-y: auto; }
  .lane-track { height: 68px; }
  .note { font-size: 2.2rem; }
}
@media (min-width: 1100px) {
  .layout { max-width: 1200px; }
}