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

:root {
  --bg-0: #07070d;
  --bg-1: #0f0f1a;
  --accent-1: #4af;
  --accent-2: #a78bfa;
  --accent-3: #f472b6;
  --danger: #f87171;
  --text: #e2e8f0;
  --text-dim: rgba(255, 255, 255, 0.55);
  --text-faint: rgba(255, 255, 255, 0.3);
  --panel: rgba(10, 12, 24, 0.55);
  --panel-border: rgba(255, 255, 255, 0.08);
}

html, body {
  background: radial-gradient(ellipse at top, #14142a 0%, var(--bg-0) 60%);
  color: var(--text);
  font-family: var(--font-family, system-ui, -apple-system, "Segoe UI", sans-serif);
  transition: background 0.4s ease;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
  height: 100dvh; /* dynamic viewport height — accounts for mobile browser chrome */
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
  touch-action: none;
}

#fullscreen-btn {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top, 0px));
  right: calc(64px + env(safe-area-inset-right, 0px));
  z-index: 15;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, background 0.15s ease;
}
#fullscreen-btn:hover { transform: scale(1.08); background: rgba(255, 255, 255, 0.1); }
#fullscreen-btn:active { transform: scale(0.94); }

/* ============================================================
   Beat pulse — DOM icons/buttons breathe in time with the hype
   track (140 BPM ≈ 0.4286s/beat). Purely visual, CSS-driven so it
   stays lightweight; the canvas entities pulse from the real audio
   clock instead (see renderer.js setPulse / audio.js getPulse).
   ============================================================ */
@keyframes pulse-beat {
  0% { transform: scale(1); }
  15% { transform: scale(1.07); }
  100% { transform: scale(1); }
}
.pulse-beat {
  animation: pulse-beat 0.4286s ease-out infinite;
}
/* Skill nodes are centered on their x/y via `transform: translate(-50%,-50%)`
   (see .skill-node below). The shared pulse-beat keyframes only set `scale(...)`,
   which — since it's the same CSS property — replaces that translate entirely
   while animating, snapping the node off-center. Give skill nodes their own
   keyframes that keep the centering translate in every frame. */
@keyframes pulse-beat-node {
  0% { transform: translate(-50%, -50%) scale(1); }
  15% { transform: translate(-50%, -50%) scale(1.07); }
  100% { transform: translate(-50%, -50%) scale(1); }
}
.skill-node.pulse-beat {
  animation-name: pulse-beat-node;
}
.hud-pill.pulse-beat { animation-duration: 0.4286s; }

#mute-btn {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top, 0px));
  right: calc(16px + env(safe-area-inset-right, 0px));
  z-index: 15;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, background 0.15s ease;
}
#mute-btn:hover { transform: scale(1.08); background: rgba(255, 255, 255, 0.1); }
#mute-btn:active { transform: scale(0.94); }

/* FPS toggle button — sits left of the fullscreen button. */
#fps-btn {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top, 0px));
  right: calc(112px + env(safe-area-inset-right, 0px));
  z-index: 15;
  height: 40px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: rgba(226, 232, 240, 0.7);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}
#fps-btn:hover { transform: scale(1.08); background: rgba(255, 255, 255, 0.1); }
#fps-btn:active { transform: scale(0.94); }
#fps-btn.active { color: #4ade80; border-color: rgba(74, 222, 128, 0.5); }

/* FPS meter readout — fixed top-left, monospace, color-coded by frame rate. */
#fps-meter {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top, 0px));
  left: calc(16px + env(safe-area-inset-left, 0px));
  z-index: 30;
  padding: 5px 10px;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: rgba(3, 4, 14, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: #4ade80;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
#fps-meter.fps-warn { color: #fbbf24; }
#fps-meter.fps-bad { color: #f87171; }
#fps-meter.hidden { display: none; }

canvas {
  display: block;
  background: var(--bg-1);
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  border-radius: 0;
  box-shadow: none;
}
/* Canvas size (width/height in px) is set dynamically in engine.js to fill
   the viewport while preserving the game's aspect ratio — see resizeCanvas(). */

/* ============================================================
   HUD — top-row pills overlaid on canvas
   ============================================================ */
#hud {
  position: fixed;
  top: calc(16px + env(safe-area-inset-top, 0px));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  z-index: 5;
  pointer-events: none;
  max-width: calc(100vw - 24px);
}
#hud.hidden { display: none; }

.hud-pill {
  background: var(--panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}
.hud-pill span {
  color: #fff;
  margin-left: 6px;
  font-variant-numeric: tabular-nums;
}

/* Combo pill — gold accent, only shown while a perfect-hit streak is active. */
.hud-pill.hud-combo {
  border-color: rgba(250, 204, 21, 0.5);
  color: #facc15;
  box-shadow: 0 0 16px rgba(250, 204, 21, 0.25);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.hud-pill.hud-combo span { color: #fde68a; }

/* Charges up over the last 5 hits before a 30-combo nova milestone (30, 60,
   90, ...) so the payoff feels earned/telegraphed instead of a surprise. */
.hud-pill.hud-combo.combo-charging {
  border-color: rgba(232, 121, 249, 0.85);
  color: #f5d0fe;
  animation: comboChargingPulse 0.35s ease-in-out infinite;
}
.hud-pill.hud-combo.combo-charging span { color: #fff; }
@keyframes comboChargingPulse {
  0%, 100% { box-shadow: 0 0 18px rgba(232, 121, 249, 0.55), 0 0 34px rgba(232, 121, 249, 0.25); transform: scale(1); }
  50% { box-shadow: 0 0 32px rgba(232, 121, 249, 0.9), 0 0 60px rgba(232, 121, 249, 0.5); transform: scale(1.08); }
}

/* Bullet-time badge — big, center-top, unmissable while slow-mo is active. */
#bullet-time-badge {
  position: fixed;
  top: calc(72px + env(safe-area-inset-top, 0px));
  left: 50%;
  transform: translateX(-50%) scale(1);
  z-index: 6;
  pointer-events: none;
  padding: 8px 22px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #e0f2fe;
  background: rgba(6, 12, 28, 0.55);
  border: 1px solid rgba(125, 211, 252, 0.65);
  border-radius: 999px;
  box-shadow: 0 0 28px rgba(56, 189, 248, 0.55), 0 0 60px rgba(56, 189, 248, 0.25);
  text-shadow: 0 0 10px rgba(125, 211, 252, 0.9);
  opacity: 1;
  transition: opacity 0.18s ease, transform 0.18s ease;
  animation: bulletTimePulse 0.55s ease-in-out infinite;
}
#bullet-time-badge span { color: #fde68a; text-shadow: 0 0 10px rgba(253, 230, 138, 0.9); }
#bullet-time-badge.hidden { opacity: 0; transform: translateX(-50%) scale(0.85); }
@keyframes bulletTimePulse {
  0%, 100% { box-shadow: 0 0 28px rgba(56, 189, 248, 0.55), 0 0 60px rgba(56, 189, 248, 0.25); }
  50% { box-shadow: 0 0 40px rgba(56, 189, 248, 0.85), 0 0 90px rgba(56, 189, 248, 0.4); }
}

/* ============================================================
   Overlay — menu / pause / game-over screens
   ============================================================ */
#overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  background: radial-gradient(ellipse at center, rgba(10, 10, 30, 0.78) 0%, rgba(0, 0, 0, 0.92) 100%);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: opacity 0.25s ease;
}
#overlay.hidden { opacity: 0; pointer-events: none; }

.overlay-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 40px 56px;
  text-align: center;
  max-width: 92vw;
  max-height: 90vh;
  overflow-y: auto;
  animation: overlay-rise 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes overlay-rise {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

#overlay h1 {
  font-size: clamp(32px, 9vw, 56px);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent-1) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 24px rgba(167, 139, 250, 0.35));
}

#overlay[data-screen="gameover"] h1 {
  background: linear-gradient(135deg, var(--danger) 0%, var(--accent-3) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  filter: drop-shadow(0 0 24px rgba(248, 113, 113, 0.4));
}

#overlay p {
  font-size: 16px;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

.overlay-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 24px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--panel-border);
  margin: 8px 0;
}
.overlay-stat span {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-faint);
}
.overlay-stat strong {
  font-size: 32px;
  font-weight: 800;
  color: #fff;
  font-variant-numeric: tabular-nums;
}

#overlay-highscore {
  font-size: 13px;
  color: var(--text-faint);
  letter-spacing: 0.08em;
}

#primary-btn {
  margin-top: 8px;
  padding: 14px 44px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: #fff;
  cursor: pointer;
  box-shadow:
    0 0 30px rgba(74, 175, 255, 0.35),
    0 6px 24px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}
#primary-btn:hover {
  transform: translateY(-2px);
  box-shadow:
    0 0 40px rgba(74, 175, 255, 0.55),
    0 10px 30px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  filter: brightness(1.08);
}
#primary-btn:active { transform: translateY(0) scale(0.98); }

.overlay-hint {
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

#overlay[data-screen="paused"] .overlay-card { animation: none; }
#overlay[data-screen="paused"] #overlay-stat,
#overlay[data-screen="paused"] #overlay-highscore,
#overlay[data-screen="paused"] #skills-btn { display: none !important; }

#skills-btn, #skins-btn {
  padding: 10px 32px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
#skills-btn:hover, #skins-btn:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
/* ============================================================
   Skins — DOM overlay, palette picker
   ============================================================ */
#skins {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at center, rgba(10, 10, 30, 0.85) 0%, rgba(0, 0, 0, 0.95) 100%);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: opacity 0.25s ease;
}
#skins.hidden { opacity: 0; pointer-events: none; }

.skins-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 28px 32px;
  width: min(720px, 94vw);
  max-height: 86vh;
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  animation: overlay-rise 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.skins-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.skins-header h2 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, var(--accent-1) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
#skins-close {
  padding: 8px 18px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
  cursor: pointer;
}
#skins-close:hover { background: rgba(255, 255, 255, 0.1); color: #fff; }

.skins-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.skin-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: 16px 18px;
  border-radius: 14px;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: var(--text);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.skin-card:hover { transform: translateY(-2px); border-color: var(--accent-1); }
.skin-card-active {
  border-color: var(--accent-1);
  background: linear-gradient(135deg, rgba(74, 175, 255, 0.12), rgba(167, 139, 250, 0.12));
  box-shadow: 0 0 24px rgba(74, 175, 255, 0.2);
}

.skin-swatch-row { display: flex; gap: 6px; }
.skin-swatch-dot {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.skin-card-name { font-size: 15px; font-weight: 800; color: #fff; }
.skin-card-desc { font-size: 12px; color: var(--text-dim); line-height: 1.4; }
.skin-card-badge {
  margin-top: 4px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-1);
}
.skin-card-active .skin-card-badge { color: #4ade80; }

.skins-hint {
  font-size: 12px;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  text-align: center;
}

@media (max-width: 700px) {
  .skins-panel { padding: 20px 16px; max-height: 80vh; }
  .skins-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   Skill Tree — DOM overlay, branching node graph
   ============================================================ */
#skill-tree {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at center, rgba(10, 10, 30, 0.85) 0%, rgba(0, 0, 0, 0.95) 100%);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: opacity 0.25s ease;
}
#skill-tree.hidden { opacity: 0; pointer-events: none; }

.skill-tree-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 28px 32px;
  width: min(1120px, 96vw);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  animation: overlay-rise 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.skill-tree-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.skill-tree-header h2 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, var(--accent-1) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.skill-points-pill {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.skill-points-pill span {
  color: #4ade80;
  margin-left: 6px;
  font-variant-numeric: tabular-nums;
}
#skill-tree-close, #skill-tree-reset {
  padding: 8px 18px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
  cursor: pointer;
}
#skill-tree-close:hover { background: rgba(255, 255, 255, 0.1); color: #fff; }
#skill-tree-reset {
  border-color: rgba(248, 113, 113, 0.35);
  color: var(--danger);
}
#skill-tree-reset:hover:not(:disabled) {
  background: rgba(248, 113, 113, 0.12);
  border-color: var(--danger);
  color: #fff;
}
#skill-tree-reset:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

#reset-confirm {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(3, 3, 10, 0.7);
  backdrop-filter: blur(4px);
  transition: opacity 0.2s ease;
}
#reset-confirm.hidden { opacity: 0; pointer-events: none; }
.reset-confirm-card {
  width: min(360px, 92vw);
  padding: 26px 28px;
  border-radius: 14px;
  border: 1px solid rgba(248, 113, 113, 0.35);
  background: linear-gradient(160deg, rgba(20, 20, 34, 0.98), rgba(10, 10, 18, 0.98));
  box-shadow: 0 0 40px rgba(248, 113, 113, 0.12), 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: overlay-rise 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.reset-confirm-card h3 {
  font-size: 18px;
  font-weight: 800;
  color: var(--danger);
  margin-bottom: 10px;
}
.reset-confirm-card p {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.5;
  margin-bottom: 20px;
}
.reset-confirm-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}
.reset-confirm-actions button {
  padding: 9px 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
}
#reset-confirm-cancel:hover { background: rgba(255, 255, 255, 0.1); color: #fff; }
#reset-confirm-ok {
  border-color: var(--danger);
  background: rgba(248, 113, 113, 0.14);
  color: #fff;
}
#reset-confirm-ok:hover { background: var(--danger); }
.skill-tree-canvas {
  position: relative;
  width: 100%;
  height: 780px;
  overflow-x: auto;
  overflow-y: hidden;
}
/* Content is wider than the visible panel on narrow viewports (4 columns +
   capstone/ultimate) — give lines/grid an explicit width so the canvas can
   scroll horizontally instead of clipping nodes off-screen. */
#skill-tree-lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 1050px;
  height: 100%;
}
.skill-line {
  stroke: rgba(255, 255, 255, 0.12);
  stroke-width: 2;
}
.skill-line-active {
  stroke: var(--accent-1);
  stroke-width: 2.5;
  filter: drop-shadow(0 0 4px rgba(74, 175, 255, 0.6));
}
#skill-tree-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 1050px;
  height: 100%;
}

.skill-node {
  position: absolute;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 148px;
  padding: 12px 10px;
  border-radius: 12px;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.skill-node:hover { transform: translate(-50%, -50%) scale(1.05); }

.skill-node-name {
  font-size: 13px;
  font-weight: 700;
  color: #fff;
}
.skill-node-cost {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.skill-locked {
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed var(--panel-border);
  cursor: not-allowed;
}
.skill-locked .skill-node-cost { color: var(--text-faint); }
.skill-locked:hover { transform: translate(-50%, -50%); }

.skill-unlockable {
  background: rgba(74, 175, 255, 0.08);
  border: 1px solid var(--accent-1);
  box-shadow: 0 0 20px rgba(74, 175, 255, 0.25);
}
.skill-unlockable .skill-node-cost { color: var(--accent-1); }

.skill-owned {
  background: linear-gradient(135deg, rgba(74, 175, 255, 0.25), rgba(167, 139, 250, 0.25));
  border: 1px solid var(--accent-2);
  box-shadow: 0 0 20px rgba(167, 139, 250, 0.3);
}
.skill-owned .skill-node-cost { color: #4ade80; }

.skill-tree-hint {
  font-size: 12px;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  text-align: center;
}

/* Themed hover/focus tooltip — fixed-position, appended to the overlay root
   so it's never clipped by the scrollable skill-tree-canvas. */
.skill-tooltip {
  position: fixed;
  z-index: 30;
  width: 240px;
  padding: 12px 14px;
  background: rgba(12, 12, 22, 0.97);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.55);
  opacity: 0;
  transform: translateY(4px);
  pointer-events: none;
  transition: opacity 0.12s ease, transform 0.12s ease;
}
.skill-tooltip.skill-tooltip-below { transform: translateY(-4px); }
.skill-tooltip.visible { opacity: 1; transform: translateY(0); }

.skill-tooltip-name {
  font-size: 14px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 2px;
}
.skill-tooltip-meta {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-1);
  margin-bottom: 8px;
}
.skill-tooltip-desc {
  font-size: 12px;
  line-height: 1.45;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.skill-tooltip-reqs {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-bottom: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--panel-border);
}
.skill-tooltip-req {
  font-size: 11px;
  line-height: 1.3;
}
.skill-tooltip-req.req-met { color: #4ade80; }
.skill-tooltip-req.req-unmet { color: var(--text-faint); }
.skill-tooltip-status {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding-top: 8px;
  border-top: 1px solid var(--panel-border);
}
.skill-tooltip-status.status-owned { color: #4ade80; }
.skill-tooltip-status.status-ready { color: var(--accent-1); }
.skill-tooltip-status.status-locked { color: var(--text-faint); }

@media (max-width: 700px), (max-height: 480px) {
  .overlay-card { padding: 28px 24px; gap: 10px; }
  #primary-btn, #skills-btn { padding: 12px 32px; font-size: 13px; }
  .overlay-hint { font-size: 10px; }
  .hud-pill { padding: 6px 12px; font-size: 11px; }
  #mute-btn, #fullscreen-btn { width: 34px; height: 34px; font-size: 14px; }
  #fullscreen-btn { right: calc(54px + env(safe-area-inset-right, 0px)); }
}

@media (max-width: 700px) {
  .skill-tree-panel { padding: 20px 16px; }
  .skill-tree-canvas { height: 640px; }
  .skill-tooltip { width: 200px; }
}