/* ── Day 13 · Interactive DNA Helix ──────────────────────── */

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

:root {
  --bg: #050510;
  --cyan: #00d4ff;
  --cyan-dim: rgba(0, 212, 255, 0.3);
  --text: #e8edf3;
  --text-muted: rgba(232, 237, 243, 0.45);
  --glass: rgba(10, 18, 40, 0.65);
  --glass-border: rgba(0, 212, 255, 0.12);
  --a-color: #4a9eff;
  --t-color: #ffd54f;
  --g-color: #ff5252;
  --c-color: #69f0ae;
}

body {
  font-family: "Syne", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── Canvas ─────────────────────────────────────────────── */
#dna-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* ── Corner Label ───────────────────────────────────────── */
.corner-label {
  position: fixed;
  top: 1.5rem;
  right: 1.8rem;
  font-family: "Space Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--text-muted);
  z-index: 10;
  pointer-events: none;
}

/* ── Title Overlay ──────────────────────────────────────── */
.title-overlay {
  position: fixed;
  top: 2rem;
  left: 2.4rem;
  z-index: 10;
  pointer-events: none;
}

.eyebrow {
  font-family: "Space Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 0.6rem;
}

.title-overlay h1 {
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: var(--text);
}

.subtitle {
  font-family: "Space Mono", monospace;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.8rem;
  letter-spacing: 0.04em;
}

/* ── Info Panel ─────────────────────────────────────────── */
.info-panel {
  position: fixed;
  top: 50%;
  right: 2rem;
  transform: translateY(-50%);
  width: 260px;
  padding: 1.6rem;
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  z-index: 30;
  transition: opacity 0.35s, transform 0.35s;
}

.info-panel.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-50%) translateX(20px);
}

.info-close {
  position: absolute;
  top: 0.8rem;
  right: 0.9rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.3rem;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}

.info-close:hover {
  color: var(--text);
}

.info-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--glass-border);
}

.info-badge {
  font-family: "Space Mono", monospace;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.info-pos {
  font-family: "Space Mono", monospace;
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

.info-body {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.info-label {
  font-family: "Space Mono", monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}

.info-value {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}

/* ── Sequence Bar ──────────────────────────────────────── */
.sequence-bar {
  position: fixed;
  bottom: 5.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 3px;
  z-index: 20;
  padding: 6px 12px;
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
}

.seq-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  opacity: 0.5;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.2s, box-shadow 0.2s;
}

.seq-dot:hover {
  opacity: 0.85;
  transform: scale(1.3);
}

.seq-dot.active {
  opacity: 1;
  transform: scale(1.5);
  box-shadow: 0 0 8px currentColor;
}

/* ── Controls Bar ───────────────────────────────────────── */
.controls-bar {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.5rem;
  z-index: 20;
}

.ctrl-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.ctrl-btn:hover {
  color: var(--cyan);
  border-color: var(--cyan-dim);
}

.ctrl-btn.active {
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.2);
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .title-overlay {
    top: 1.2rem;
    left: 1.4rem;
  }

  .title-overlay h1 {
    font-size: 1.5rem;
  }

  .corner-label {
    top: 1rem;
    right: 1.2rem;
  }

  .info-panel {
    top: auto;
    bottom: 0;
    right: 0;
    left: 0;
    width: 100%;
    transform: none;
    border-radius: 16px 16px 0 0;
    max-height: 40vh;
    overflow-y: auto;
  }

  .info-panel.hidden {
    transform: translateY(20px);
  }

  .sequence-bar {
    bottom: 5rem;
    gap: 2px;
    padding: 5px 8px;
    max-width: 90vw;
    overflow-x: auto;
  }

  .seq-dot {
    width: 6px;
    height: 6px;
    flex-shrink: 0;
  }

  .controls-bar {
    bottom: 1.2rem;
  }

  .ctrl-btn {
    width: 38px;
    height: 38px;
  }
}

@media (max-width: 480px) {
  .title-overlay h1 {
    font-size: 1.2rem;
  }

  .subtitle {
    font-size: 0.6rem;
  }
}

/* ── Reduced Motion ─────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .info-panel,
  .ctrl-btn,
  .seq-dot {
    transition: none;
  }
}