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

:root {
  --bg:       #0a0a18;
  --surface:  #13132a;
  --border:   rgba(255,255,255,0.1);
  --text:     #e0e0f0;
  --muted:    #7070a0;
  --accent:   #cc44ff;
  --accent2:  #44aaff;
  --danger:   #ff4466;
  --success:  #44ffbb;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Courier New', Courier, monospace;
  font-size: 15px;
  overflow-x: hidden;
}

/* ── Nav ─────────────────────────────────────────────────────────────────── */
#nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  height: 48px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-logo {
  font-size: 1rem;
  font-weight: bold;
  color: var(--accent);
  letter-spacing: 2px;
  flex-shrink: 0;
}

.nav-links { display: flex; gap: 4px; }
.nav-links button {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  transition: border-color 0.15s;
}
.nav-links button:hover { border-color: var(--accent); color: var(--accent); }

.nav-user   { margin-left: auto; color: var(--muted); font-size: 13px; }
.nav-logout { color: var(--muted); font-size: 13px; text-decoration: none; }
.nav-logout:hover { color: var(--danger); }

/* ── Screens ─────────────────────────────────────────────────────────────── */
.screen {
  min-height: calc(100vh - 48px);
  padding: 20px 16px;
}

.screen.centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  text-align: center;
}

.screen-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.screen-header h2 { font-size: 1.1rem; letter-spacing: 1px; color: var(--accent); }

/* ── Login ───────────────────────────────────────────────────────────────── */
.logo-title {
  font-size: 2.5rem;
  letter-spacing: 6px;
  color: var(--accent);
  text-shadow: 0 0 30px var(--accent);
}
.subtitle { color: var(--muted); letter-spacing: 2px; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  font-weight: bold;
  letter-spacing: 1px;
  text-decoration: none;
  transition: opacity 0.15s, transform 0.1s;
}
.btn:hover { opacity: 0.85; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary   { background: var(--accent);  color: #fff; }
.btn-secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn-back      { background: none; border: none; color: var(--muted); cursor: pointer; font-family: inherit; font-size: 13px; align-self: flex-start; margin-bottom: 8px; }
.btn-back:hover { color: var(--text); }

/* ── Song list ───────────────────────────────────────────────────────────── */
#search-input {
  margin-left: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
  padding: 6px 12px;
  width: 200px;
}
#search-input:focus { outline: none; border-color: var(--accent2); }

.song-list { display: flex; flex-direction: column; gap: 8px; max-width: 700px; margin: 0 auto; }

.pack-header {
  margin-top: 20px;
  padding: 4px 0 6px;
  font-size: 11px;
  font-weight: bold;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
}
.pack-header:first-child { margin-top: 4px; }

.song-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.song-card:hover { border-color: var(--accent); background: #1a1a38; }

.song-title  { font-size: 1rem; font-weight: bold; }
.song-artist { color: var(--muted); font-size: 13px; margin-top: 2px; }
.song-meta   { margin-top: 6px; font-size: 12px; color: var(--muted); display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }

/* Difficulty badges */
.diff { display: inline-block; padding: 2px 7px; border-radius: 4px; font-size: 11px; font-weight: bold; }
.diff-beginner  { background: #333; color: #aaa; }
.diff-basic     { background: #1a5c1a; color: #44ff44; }
.diff-difficult { background: #5c3800; color: #ffaa00; }
.diff-expert    { background: #5c1a1a; color: #ff4444; }
.diff-challenge { background: #3a006a; color: #cc44ff; }

.empty { color: var(--muted); text-align: center; padding: 40px 0; }

/* ── Difficulty select ───────────────────────────────────────────────────── */
.artist    { color: var(--muted); }
.bpm-label { color: var(--muted); font-size: 13px; }

.diff-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin: 16px 0;
}

.diff-btn {
  padding: 14px 28px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 15px;
  font-weight: bold;
  letter-spacing: 1px;
  transition: opacity 0.15s, transform 0.1s;
}
.diff-btn:hover { opacity: 0.85; transform: scale(1.04); }

.diff-btn.diff-beginner  { background: #333; color: #ccc; }
.diff-btn.diff-basic     { background: #1a5c1a; color: #88ff88; }
.diff-btn.diff-difficult { background: #5c3800; color: #ffcc44; }
.diff-btn.diff-expert    { background: #5c1a1a; color: #ff6666; }
.diff-btn.diff-challenge { background: #3a006a; color: #cc66ff; }

.mode-row { margin-top: 12px; }

/* ── Game screen ─────────────────────────────────────────────────────────── */
.game-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px;
  background: #080812;
  min-height: calc(100vh - 48px);
}

#game-canvas {
  display: block;
  background: #0a0a18;
  image-rendering: pixelated;
}

.key-legend {
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 2px;
}

/* ── Results ─────────────────────────────────────────────────────────────── */
#screen-results { position: relative; overflow: hidden; gap: 12px; }

@keyframes gradeIn {
  from { transform: scale(0.2) rotate(-8deg); opacity: 0; }
  to   { transform: scale(1)   rotate(0deg);  opacity: 1; }
}
@keyframes gradePulse {
  0%, 100% { text-shadow: 0 0 40px currentColor; }
  50%       { text-shadow: 0 0 90px currentColor, 0 0 150px currentColor; }
}
@keyframes fadeUp {
  from { transform: translateY(18px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.result-grade {
  font-size: 6rem;
  font-weight: bold;
  letter-spacing: 6px;
  text-shadow: 0 0 40px currentColor;
  animation: gradeIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
.result-grade.grade-pulse {
  animation: gradeIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both,
             gradePulse 2.5s 0.6s ease-in-out infinite;
}

.result-status {
  font-size: 1rem;
  letter-spacing: 4px;
  animation: fadeUp 0.4s 0.35s ease both;
}
.result-status.is-pfc     { color: #fff; text-shadow: 0 0 18px var(--accent), 0 0 36px var(--accent2); }
.result-status.is-fc      { color: #ffdd00; text-shadow: 0 0 18px #ffdd00; }
.result-status.is-cleared { color: var(--accent2); }
.result-status.is-failed  { color: var(--danger); }

.result-score {
  font-size: 3rem;
  font-weight: bold;
  letter-spacing: 3px;
  animation: fadeUp 0.4s 0.55s ease both;
}
.result-pb {
  color: #ffdd00;
  font-size: 12px;
  min-height: 18px;
  letter-spacing: 2px;
  animation: fadeUp 0.4s 0.7s ease both;
}
.result-meta {
  color: var(--muted);
  font-size: 13px;
  animation: fadeUp 0.4s 0.82s ease both;
}
.result-breakdown {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  animation: fadeUp 0.4s 0.95s ease both;
}
.judge-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 6px 12px;
  border-radius: 6px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  min-width: 50px;
}
.judge-chip .jlabel { font-size: 9px; letter-spacing: 1px; opacity: 0.65; }
.judge-chip .jcount { font-size: 16px; font-weight: bold; }

.result-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 4px;
  animation: fadeUp 0.4s 1.1s ease both;
}
.btn-large { padding: 13px 32px; font-size: 15px; }

/* ── Lobby ───────────────────────────────────────────────────────────────── */
.room-list { display: flex; flex-direction: column; gap: 8px; max-width: 600px; margin: 0 auto 24px; }

.room-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  cursor: pointer;
  transition: border-color 0.15s;
}
.room-card:hover { border-color: var(--accent2); }
.room-card .players { color: var(--accent2); }

.lobby-create { max-width: 600px; margin: 0 auto; text-align: center; padding: 24px; border: 1px dashed var(--border); border-radius: 8px; }
.lobby-create h3 { margin-bottom: 8px; color: var(--accent); }
.lobby-create p  { color: var(--muted); margin-bottom: 12px; font-size: 13px; }

.room-info    { color: var(--accent2); letter-spacing: 1px; margin-bottom: 12px; }
.room-players { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.room-players li { color: var(--text); font-size: 1rem; }
.room-actions { display: flex; gap: 12px; }

/* ── Versus result ───────────────────────────────────────────────────────── */
.versus-scores { display: flex; align-items: center; gap: 32px; }
.versus-label  { color: var(--muted); font-size: 13px; margin-bottom: 4px; }
.versus-vs     { font-size: 1.5rem; color: var(--muted); }

/* ── Settings ────────────────────────────────────────────────────────────── */
.setting-row {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 20px;
  width: 100%;
  max-width: 400px;
}
.setting-row label { width: 120px; color: var(--muted); font-size: 13px; }
.setting-row input[type=range] { flex: 1; accent-color: var(--accent); }
.setting-note { color: var(--muted); font-size: 13px; }

/* ── Spinner ─────────────────────────────────────────────────────────────── */
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }