/* ═══════════════════════════════════════════════════════════════
   SERPENT // NEON ARCADE  —  styles.css
   Aesthetic: Deep-void cyberpunk neon arcade
   ═══════════════════════════════════════════════════════════════ */

/* ─── CSS Variables ──────────────────────────────────────────── */
:root {
  --bg:          #040608;
  --bg-panel:    rgba(8, 14, 22, 0.82);
  --border:      rgba(0, 255, 204, 0.18);
  --border-glow: rgba(0, 255, 204, 0.55);
  --cyan:        #00ffcc;
  --magenta:     #ff2d78;
  --yellow:      #ffe600;
  --dim:         rgba(255, 255, 255, 0.38);
  --text:        #e8f4f0;
  --font-head:   'Orbitron', 'Courier New', monospace;
  --font-mono:   'Share Tech Mono', 'Courier New', monospace;
  --radius:      10px;
  --transition:  0.18s ease;
}

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

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  -webkit-font-smoothing: antialiased;
}

/* ─── Scanlines atmosphere overlay ──────────────────────────── */
.scanlines {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 3px,
    rgba(0, 0, 0, 0.07) 3px,
    rgba(0, 0, 0, 0.07) 4px
  );
  mix-blend-mode: multiply;
}

/* ─── App Layout ─────────────────────────────────────────────── */
#app {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100vw;
  height: 100vh;
  gap: 0;
}

/* ─── HUD ────────────────────────────────────────────────────── */
#hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(520px, 94vw);
  padding: 8px 16px;
  margin-bottom: 8px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  flex-shrink: 0;
}

.hud-block { display: flex; flex-direction: column; align-items: flex-start; gap: 1px; }
.hud-right { align-items: flex-end; }
.hud-center { align-items: center; }

.hud-label {
  font-family: var(--font-head);
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--dim);
}
.hud-value {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan);
  text-shadow: 0 0 12px var(--cyan);
  letter-spacing: 0.05em;
  min-width: 3ch;
  transition: color 0.2s;
}

#mode-badge {
  font-family: var(--font-head);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--magenta);
  text-shadow: 0 0 10px var(--magenta);
  padding: 3px 10px;
  border: 1px solid rgba(255, 45, 120, 0.35);
  border-radius: 4px;
  background: rgba(255, 45, 120, 0.08);
}

/* ─── Canvas Wrap & Shake ────────────────────────────────────── */
#canvas-wrap {
  position: relative;
  flex-shrink: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow:
    0 0 0 1px var(--border),
    0 0 30px rgba(0, 255, 204, 0.08),
    0 0 80px rgba(0, 255, 204, 0.04);
}

#game-canvas {
  display: block;
  background: #070d12;
}

/* Screen-shake keyframe — JS adds class 'shake' to #canvas-wrap */
@keyframes shake {
  0%   { transform: translate(0, 0) rotate(0deg); }
  15%  { transform: translate(-7px, 4px) rotate(-1.2deg); }
  30%  { transform: translate(6px, -5px) rotate(1deg); }
  45%  { transform: translate(-5px, 6px) rotate(-0.8deg); }
  60%  { transform: translate(5px, -3px) rotate(0.6deg); }
  75%  { transform: translate(-3px, 3px) rotate(-0.4deg); }
  90%  { transform: translate(2px, -2px) rotate(0.2deg); }
  100% { transform: translate(0, 0) rotate(0deg); }
}
#canvas-wrap.shake { animation: shake 0.52s cubic-bezier(.36,.07,.19,.97) both; }

/* ─── Pause icon button ──────────────────────────────────────── */
#btn-pause-icon {
  position: fixed;
  top: 14px; right: 14px;
  z-index: 200;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--cyan);
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(10px);
}
#btn-pause-icon:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 14px rgba(0,255,204,0.3);
}
#btn-pause-icon svg { width: 16px; height: 16px; }

/* ─── Overlays (Start, Pause, Game Over) ────────────────────── */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  background: rgba(4, 6, 8, 0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: fadeIn 0.22s ease;
}
.overlay.hidden { display: none; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* Glassmorphism panel */
.overlay-glass {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 32px 36px;
  background: rgba(8, 16, 24, 0.88);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow:
    0 0 0 1px rgba(0,255,204,0.06),
    0 8px 60px rgba(0,0,0,0.7),
    inset 0 1px 0 rgba(255,255,255,0.06);
  max-width: min(440px, 92vw);
  width: 100%;
}

/* ─── Start Screen ───────────────────────────────────────────── */
.start-glass { gap: 16px; padding: 28px 32px; }

.logo-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  margin-bottom: 4px;
}
.logo-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--dim);
}
.logo-main {
  font-family: var(--font-head);
  font-size: clamp(38px, 8vw, 58px);
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-shadow:
    0 0 20px var(--cyan),
    0 0 60px rgba(0,255,204,0.35),
    0 0 120px rgba(0,255,204,0.12);
  line-height: 1;
}
.logo-ver {
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(0,255,204,0.4);
  letter-spacing: 0.2em;
}

/* Setting rows */
.setting-row {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.setting-label {
  font-family: var(--font-head);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--dim);
  min-width: 80px;
  flex-shrink: 0;
}

/* Swatch color buttons */
.swatch-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}
.swatch {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  outline: none;
  flex-shrink: 0;
}
.swatch:hover, .swatch.active {
  border-color: #fff;
  box-shadow: 0 0 10px currentColor, 0 0 20px currentColor;
  transform: scale(1.15);
}
.swatch-custom {
  background: rgba(255,255,255,0.12);
  border-color: var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  color: var(--dim);
  cursor: pointer;
  position: relative;
}
.swatch-custom input[type="color"] {
  position: absolute; inset: 0;
  opacity: 0; cursor: pointer;
  width: 100%; height: 100%;
}
.swatch-custom:hover { border-color: var(--cyan); color: var(--cyan); }

/* Segmented buttons */
.seg-group, .toggle-wrap, .mode-group {
  display: flex;
  gap: 4px;
}
.seg {
  font-family: var(--font-head);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.15em;
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--dim);
  cursor: pointer;
  transition: all var(--transition);
  outline: none;
}
.seg:hover { border-color: var(--cyan); color: var(--cyan); }
.seg.active {
  background: rgba(0,255,204,0.12);
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 10px rgba(0,255,204,0.2);
}

.mode-desc {
  font-size: 11px;
  color: var(--dim);
  text-align: center;
  min-height: 1.4em;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  transition: color 0.2s;
}

.hint-text {
  font-size: 10px;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.2);
  font-family: var(--font-mono);
}

/* ─── Neon Buttons ───────────────────────────────────────────── */
.neon-btn {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.22em;
  padding: 12px 28px;
  background: rgba(0,255,204,0.1);
  border: 1px solid var(--cyan);
  border-radius: var(--radius);
  color: var(--cyan);
  text-shadow: 0 0 10px var(--cyan);
  box-shadow: 0 0 20px rgba(0,255,204,0.15), inset 0 0 20px rgba(0,255,204,0.04);
  cursor: pointer;
  transition: all var(--transition);
  outline: none;
}
.neon-btn:hover {
  background: rgba(0,255,204,0.2);
  box-shadow: 0 0 30px rgba(0,255,204,0.3), inset 0 0 30px rgba(0,255,204,0.08);
  transform: translateY(-1px);
}
.neon-btn:active { transform: translateY(1px); }
.neon-btn-lg { padding: 14px 40px; font-size: 14px; margin-top: 4px; }
.neon-btn-secondary {
  border-color: var(--magenta);
  color: var(--magenta);
  background: rgba(255,45,120,0.08);
  text-shadow: 0 0 10px var(--magenta);
  box-shadow: 0 0 20px rgba(255,45,120,0.12), inset 0 0 20px rgba(255,45,120,0.04);
}
.neon-btn-secondary:hover {
  background: rgba(255,45,120,0.18);
  box-shadow: 0 0 30px rgba(255,45,120,0.28), inset 0 0 30px rgba(255,45,120,0.08);
}

/* ─── Pause overlay ──────────────────────────────────────────── */
.overlay-title {
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 900;
  letter-spacing: 0.25em;
  color: var(--cyan);
  text-shadow: 0 0 20px var(--cyan);
}
.overlay-hint {
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.08em;
}
.overlay-hint kbd {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 3px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 11px;
}

/* ─── Game Over screen ───────────────────────────────────────── */
.go-glass { gap: 14px; }

.go-title {
  font-family: var(--font-head);
  font-size: clamp(28px, 7vw, 42px);
  font-weight: 900;
  letter-spacing: 0.2em;
  color: var(--magenta);
  text-shadow: 0 0 20px var(--magenta), 0 0 60px rgba(255,45,120,0.3);
  animation: flicker 1.8s ease-in-out infinite alternate;
}
@keyframes flicker {
  0%, 90% { opacity: 1; }
  92% { opacity: 0.6; }
  94% { opacity: 1; }
  97% { opacity: 0.7; }
  100% { opacity: 1; }
}

.go-score-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.go-label {
  font-family: var(--font-head);
  font-size: 9px;
  letter-spacing: 0.25em;
  color: var(--dim);
}
.go-score {
  font-family: var(--font-head);
  font-size: 40px;
  font-weight: 900;
  color: var(--cyan);
  text-shadow: 0 0 16px var(--cyan);
  letter-spacing: 0.05em;
}
.go-best { color: var(--yellow); text-shadow: 0 0 16px var(--yellow); font-size: 28px; }

.go-btn-row { display: flex; gap: 12px; margin-top: 4px; }

/* ─── Desktop-only (grid size hidden on mobile) ──────────────── */
@media (max-width: 600px) {
  .desktop-only { display: none !important; }
}

/* ─── Mobile D-Pad ───────────────────────────────────────────── */
#dpad {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  touch-action: none;
}
#dpad.hidden { display: none; }

.dpad-row { display: flex; gap: 4px; align-items: center; }
.dpad-mid { justify-content: center; }

.dpad-btn {
  width: 56px; height: 56px;
  background: rgba(0, 255, 204, 0.08);
  border: 1px solid rgba(0, 255, 204, 0.35);
  border-radius: 10px;
  color: var(--cyan);
  font-size: 22px;
  cursor: pointer;
  outline: none;
  transition: all 0.1s;
  display: flex; align-items: center; justify-content: center;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  backdrop-filter: blur(6px);
}
.dpad-btn:active {
  background: rgba(0, 255, 204, 0.25);
  box-shadow: 0 0 16px rgba(0,255,204,0.4);
  transform: scale(0.93);
}
.dpad-center-btn {
  background: transparent;
  border-color: rgba(0,255,204,0.08);
  color: rgba(0,255,204,0.15);
  font-size: 14px;
  cursor: default;
}

/* ─── Mobile canvas / layout adaptations ────────────────────── */
@media (max-width: 600px) {
  #canvas-wrap {
    border-radius: 4px;
    box-shadow: none;
  }
  #hud { width: 98vw; padding: 6px 12px; }
  .hud-value { font-size: 18px; }
  .start-glass, .go-glass, .overlay-glass {
    padding: 22px 18px;
    border-radius: 14px;
    gap: 13px;
  }
  .logo-main { font-size: 36px; }
  .setting-row { flex-direction: column; align-items: flex-start; gap: 6px; }
  .seg { padding: 8px 12px; font-size: 9px; }
  .mode-group { flex-wrap: wrap; }
}

/* ─── Portal dimension themes (class on canvas-wrap) ────────── */
#canvas-wrap.dim-1 { box-shadow: 0 0 0 1px rgba(255,45,120,0.4), 0 0 40px rgba(255,45,120,0.12); }
#canvas-wrap.dim-2 { box-shadow: 0 0 0 1px rgba(255,230,0,0.4), 0 0 40px rgba(255,230,0,0.12); }
#canvas-wrap.dim-3 { box-shadow: 0 0 0 1px rgba(124,58,237,0.5), 0 0 40px rgba(124,58,237,0.14); }

/* ─── Subtle star/noise background ──────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(ellipse at 20% 30%, rgba(0,255,204,0.03) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 70%, rgba(255,45,120,0.03) 0%, transparent 60%),
    radial-gradient(ellipse at 50% 50%, rgba(0,0,0,0) 0%, rgba(4,6,8,0.6) 100%);
  pointer-events: none;
  z-index: 0;
}
#app { position: relative; z-index: 1; }