* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

:root {
  --bg: #0a0a12;
  --bg-soft: #12121e;
  --card: rgba(255,255,255,0.05);
  --card-border: rgba(255,255,255,0.1);
  --accent1: #ff6b6b;
  --accent2: #ffd93d;
  --accent3: #6bcb77;
  --accent4: #4d96ff;
  --accent5: #a06bff;
  --text: #ffffff;
  --text-dim: #9a9aad;
  --grid-beat: rgba(255,255,255,0.16);
  --grid-sub: rgba(255,255,255,0.06);
  --lane-color-0: #ff6b6b;
  --lane-color-1: #ffd93d;
  --lane-color-2: #6bcb77;
  --lane-color-3: #4d96ff;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  overflow: hidden;
  overscroll-behavior: none;
}

.screen { display: none; width: 100%; height: 100vh; height: 100dvh; flex-direction: column; }
.screen.active { display: flex; }
.hidden { display: none !important; }

/* ===== ボタン共通 ===== */
.btn {
  padding: 14px 32px; border: none; border-radius: 50px; font-size: 15px; font-weight: 700;
  cursor: pointer; transition: all .15s; letter-spacing: .5px; color: #fff;
}
.btn-primary { background: linear-gradient(135deg, var(--accent4), var(--accent5)); }
.btn-secondary { background: rgba(255,255,255,0.08); border: 1px solid var(--card-border); }
.btn-accent { background: linear-gradient(135deg, var(--accent3), var(--accent4)); }
.btn-danger { background: rgba(255,107,107,0.18); color: var(--accent1); border: 1px solid rgba(255,107,107,0.4); }
.btn-large { padding: 16px 48px; font-size: 17px; width: min(340px, 90%); align-self: center; }
.btn:disabled { opacity: .35; cursor: not-allowed; }
.btn:hover:not(:disabled) { transform: translateY(-2px); filter: brightness(1.15); }
.btn:active { transform: translateY(0); }
.btn-small {
  padding: 8px 14px; border-radius: 8px; border: 1px solid var(--card-border);
  background: rgba(255,255,255,0.06); color: #fff; font-size: 13px; cursor: pointer;
}
.btn-small.recording { background: var(--accent1); color: #000; }
.btn-icon { background: rgba(255,255,255,0.1); border: none; color: #fff; font-size: 15px; width: 32px; height: 32px; border-radius: 50%; cursor: pointer; flex-shrink: 0; }
.btn-back { background: none; border: none; color: var(--text-dim); font-size: 14px; cursor: pointer; padding: 8px; }
.file-label { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.hint { color: var(--text-dim); font-size: 12px; }

/* ===== タイトル ===== */
#screen-title { justify-content: center; align-items: center; }
.title-wrap { display: flex; flex-direction: column; align-items: center; gap: 26px; }
.logo {
  font-size: 64px; font-weight: 900; letter-spacing: 4px;
  background: linear-gradient(135deg, var(--accent1), var(--accent2), var(--accent3), var(--accent4));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 30px rgba(77,150,255,0.4));
}
.tagline { color: var(--text-dim); font-size: 14px; }
.title-buttons { display: flex; flex-direction: column; gap: 14px; width: min(300px, 80vw); }
.version-text { color: var(--text-dim); font-size: 12px; }

/* ===== 曲選択 ===== */
.screen-header { display: flex; align-items: center; gap: 12px; padding: 14px 18px; }
.screen-header h2 { font-size: 18px; }
#screen-select { padding-bottom: 16px; overflow-y: auto; align-items: center; gap: 14px; }
.song-list { width: 100%; max-width: 560px; display: flex; flex-direction: column; gap: 10px; padding: 0 16px; overflow-y: auto; flex: 1; }
.song-card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 12px;
  padding: 14px 18px; cursor: pointer; transition: all .15s;
}
.song-card:hover { border-color: var(--accent4); }
.song-card.selected { background: rgba(77,150,255,0.18); border-color: var(--accent4); box-shadow: 0 0 18px rgba(77,150,255,0.25); }
.song-name { font-size: 17px; font-weight: 700; }
.song-sub { font-size: 12px; color: var(--text-dim); }
.song-meta { margin-top: 8px; display: flex; gap: 10px; flex-wrap: wrap; font-size: 12px; color: var(--text-dim); align-items: center; }
.song-diff { font-weight: 700; padding: 2px 8px; border-radius: 6px; }
.diff-easy { background: rgba(107,203,119,0.2); color: var(--accent3); }
.diff-normal { background: rgba(77,150,255,0.2); color: var(--accent4); }
.diff-hard { background: rgba(255,107,107,0.2); color: var(--accent1); }
.song-best { color: var(--accent2); font-weight: 700; }
.settings-panel { width: 100%; max-width: 560px; padding: 0 16px; display: flex; flex-direction: column; gap: 8px; font-size: 13px; color: var(--text-dim); }
.settings-panel label { display: flex; align-items: center; gap: 8px; }
.settings-panel input[type=range] { flex: 1; }

/* ===== プレイ画面 ===== */
#screen-play { position: relative; background: #050508; }
.play-hud { display: flex; align-items: center; gap: 10px; padding: 5px 14px; z-index: 5; flex-shrink: 0; }
.hud-score { font-size: 16px; font-weight: 900; font-variant-numeric: tabular-nums; min-width: 64px; }
.hud-auto-badge { font-size: 11px; font-weight: 800; color: var(--accent2); background: rgba(255,217,61,0.15); border: 1px solid rgba(255,217,61,0.4); border-radius: 6px; padding: 2px 6px; flex-shrink: 0; }
.progress-bar-track { flex: 1; height: 4px; background: rgba(255,255,255,0.1); border-radius: 4px; overflow: hidden; }
.progress-bar-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent4), var(--accent5)); transition: width .1s linear; }
.hud-combo {
  position: absolute; top: 60%; left: 50%; transform: translateX(-50%);
  font-size: 24px; font-weight: 900; color: var(--accent2); text-shadow: 0 0 16px rgba(255,217,61,0.6); z-index: 5;
  pointer-events: none;
}
.play-lanes { flex: 1; display: flex; touch-action: none; }
.lane {
  flex: 1; position: relative; border-left: 1px solid rgba(255,255,255,0.05);
  display: flex; flex-direction: column; justify-content: flex-end; align-items: center;
}
.lane:nth-child(1) { --lane-color: var(--lane-color-0); }
.lane:nth-child(2) { --lane-color: var(--lane-color-1); }
.lane:nth-child(3) { --lane-color: var(--lane-color-2); }
.lane:nth-child(4) { --lane-color: var(--lane-color-3); }
.lane-track { position: absolute; inset: 0; overflow: hidden; }
.sudden-cover { position: absolute; top: 0; left: 0; right: 0; height: 0; background: #050508; z-index: 5; pointer-events: none; }
.judgment-line { position: absolute; left: 6%; right: 6%; top: 82%; height: 4px; background: var(--lane-color); border-radius: 2px; box-shadow: 0 0 12px var(--lane-color); }
.lane-key-hint {
  position: relative; margin-bottom: 4%; width: 44px; height: 44px; border-radius: 10px;
  background: rgba(255,255,255,0.06); border: 1px solid var(--card-border);
  display: flex; align-items: center; justify-content: center; font-weight: 900; color: var(--text-dim); z-index: 2;
}
.lane.lane-active { background: color-mix(in srgb, var(--lane-color) 15%, transparent); }
.lane.lane-active .lane-key-hint { background: var(--lane-color); color: #000; }
.note {
  position: absolute; left: 10%; right: 10%; top: 0; height: 26px; border-radius: 8px;
  background: var(--lane-color); box-shadow: 0 0 10px var(--lane-color);
  transition: opacity .12s, transform .05s linear;
}
.note-perfect, .note-good { opacity: 0; transform: scale(1.4) !important; }
.note-miss { opacity: 0; background: #555 !important; box-shadow: none !important; }
.note-hold { background: linear-gradient(var(--lane-color), color-mix(in srgb, var(--lane-color) 55%, transparent)); border-bottom: 4px solid #fff; border-radius: 8px 8px 4px 4px; }
.note-hold.note-holding { filter: brightness(1.5); box-shadow: 0 0 20px #fff; }
.judgment-popup {
  position: absolute; top: 40%; left: 50%; transform: translate(-50%, 10px); opacity: 0;
  font-weight: 900; font-size: 15px; letter-spacing: 1px; transition: all .25s ease-out; z-index: 4; white-space: nowrap;
}
.judgment-popup.judgment-pop { opacity: 1; transform: translate(-50%, -10px); }
.judgment-perfect { color: var(--accent2); text-shadow: 0 0 10px var(--accent2); }
.judgment-good { color: var(--accent3); text-shadow: 0 0 10px var(--accent3); }
.judgment-miss { color: var(--text-dim); }

.modal { position: absolute; inset: 0; background: rgba(0,0,0,0.7); display: flex; align-items: center; justify-content: center; z-index: 10; }
.modal-box { background: var(--bg-soft); border: 1px solid var(--card-border); border-radius: 16px; padding: 28px; display: flex; flex-direction: column; gap: 12px; width: min(280px, 80vw); text-align: center; }

/* ===== リザルト ===== */
#screen-result { align-items: center; justify-content: center; }
.result-wrap { display: flex; flex-direction: column; align-items: center; gap: 16px; padding: 20px; }
.result-rank {
  font-size: 90px; font-weight: 900; line-height: 1;
  background: linear-gradient(135deg, var(--accent2), var(--accent1)); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.rank-s { background: linear-gradient(135deg, #ffd93d, #ff6b6b); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.rank-a { background: linear-gradient(135deg, #6bcb77, #4d96ff); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.rank-b { color: var(--accent4); -webkit-text-fill-color: var(--accent4); }
.rank-c { color: var(--text-dim); -webkit-text-fill-color: var(--text-dim); }
.rank-d { color: #666; -webkit-text-fill-color: #666; }
.result-stats { width: min(320px, 85vw); display: flex; flex-direction: column; gap: 8px; background: var(--card); border: 1px solid var(--card-border); border-radius: 12px; padding: 16px 20px; }
.result-row { display: flex; justify-content: space-between; font-size: 15px; }
.result-judgments { display: flex; justify-content: space-between; font-size: 12px; margin-top: 6px; }
.j-perfect { color: var(--accent2); } .j-good { color: var(--accent3); } .j-miss { color: var(--text-dim); }
.result-best { color: var(--accent2); font-weight: 700; text-align: center; }
.result-buttons { display: flex; flex-direction: column; gap: 10px; width: min(300px, 85vw); }

/* ===== エディター ===== */
#screen-editor { background: #08080f; }
.editor-topbar, .editor-toolbar {
  display: flex; align-items: center; gap: 10px; padding: 8px 14px; flex-wrap: wrap;
  border-bottom: 1px solid var(--card-border); background: var(--bg-soft);
}
.editor-input {
  background: rgba(255,255,255,0.06); border: 1px solid var(--card-border); border-radius: 6px;
  color: #fff; padding: 6px 10px; font-size: 13px;
}
#editor-title { width: 140px; } #editor-artist { width: 120px; }
.editor-label { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-dim); }
.editor-num { width: 60px; background: rgba(255,255,255,0.06); border: 1px solid var(--card-border); border-radius: 6px; color: #fff; padding: 4px 6px; }
.editor-audio-file-wrap { display: flex; align-items: center; gap: 8px; }
#editor-note-count { margin-left: auto; }

.editor-timeline-scroll { flex: 1; overflow: auto; position: relative; background: #050508; }
.editor-track-area { position: relative; min-width: 100%; }
.editor-ruler { position: relative; height: 24px; border-bottom: 1px solid var(--card-border); background: var(--bg-soft); }
.ruler-tick { position: absolute; top: 0; bottom: 0; width: 1px; background: rgba(255,255,255,0.15); font-size: 10px; color: var(--text-dim); padding-left: 3px; }
.ruler-tick-minor { background: rgba(255,255,255,0.06); }
.editor-lanes { display: flex; flex-direction: column; }
.editor-lane-row {
  position: relative; height: 64px; border-bottom: 1px solid rgba(255,255,255,0.06); cursor: crosshair;
}
.editor-lane-row:nth-child(1) { --lane-color: var(--lane-color-0); }
.editor-lane-row:nth-child(2) { --lane-color: var(--lane-color-1); }
.editor-lane-row:nth-child(3) { --lane-color: var(--lane-color-2); }
.editor-lane-row:nth-child(4) { --lane-color: var(--lane-color-3); }
.editor-lane-label {
  position: sticky; left: 0; display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; margin: 4px; border-radius: 6px; background: rgba(255,255,255,0.08);
  color: var(--text-dim); font-weight: 900; font-size: 12px; z-index: 2;
}
.editor-note {
  position: absolute; top: 8px; width: 18px; height: 48px; border-radius: 5px;
  background: var(--lane-color); box-shadow: 0 0 8px var(--lane-color); cursor: pointer;
}
.editor-note-selected { outline: 2px solid #fff; }
.editor-note-hold { border-radius: 5px; opacity: 0.85; background: linear-gradient(90deg, var(--lane-color), color-mix(in srgb, var(--lane-color) 60%, transparent)); }
.editor-note-hold-preview { background: rgba(255,255,255,0.25); border: 1px dashed #fff; pointer-events: none; }
.selection-box { position: absolute; border: 1px dashed var(--accent4); background: rgba(77,150,255,0.15); pointer-events: none; z-index: 6; }
.editor-shortcuts-hint { padding: 6px 14px; font-size: 11px; color: var(--text-dim); background: var(--bg-soft); border-bottom: 1px solid var(--card-border); }
.editor-playhead { position: absolute; top: 0; bottom: 0; width: 2px; background: #fff; box-shadow: 0 0 8px #fff; pointer-events: none; z-index: 3; }
.editor-note-info { padding: 10px 16px; border-top: 1px solid var(--card-border); background: var(--bg-soft); font-size: 13px; min-height: 44px; display: flex; align-items: center; gap: 14px; }
.note-info-row { display: flex; gap: 8px; }

/* ===== ヘルプ ===== */
#screen-help { overflow-y: auto; }
.help-content { padding: 0 20px 30px; max-width: 640px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.help-content h3 { margin-bottom: 8px; color: var(--accent4); }
.help-content p { line-height: 1.7; color: #ddd; font-size: 14px; }
kbd { background: rgba(255,255,255,0.1); border: 1px solid var(--card-border); border-radius: 4px; padding: 2px 7px; font-family: monospace; }
.changelog-entry { margin-bottom: 14px; }
.changelog-header { display: flex; gap: 10px; align-items: baseline; margin-bottom: 4px; }
.changelog-version { font-weight: 800; color: var(--accent4); }
.changelog-date { font-size: 12px; color: var(--text-dim); }
.changelog-notes { padding-left: 18px; font-size: 13px; color: #ccc; line-height: 1.6; }

/* ===== レスポンシブ ===== */
@media (max-width: 480px) {
  .logo { font-size: 44px; }
  .lane-key-hint { width: 36px; height: 36px; font-size: 13px; }
  .editor-topbar, .editor-toolbar { padding: 6px 8px; gap: 6px; }
  #editor-title { width: 100px; } #editor-artist { width: 90px; }
}