/* ============================================
   Twilight Route — shared design system
   Songwriting curriculum hub + lesson pages
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&family=VT323&family=Inter:wght@400;500;600&display=swap');

:root {
  /* === sky / night palette === */
  --sky-deep: #1A1230;         /* darkest night, top of sky */
  --sky-dusk: #2A1F3D;         /* main dusty purple */
  --sky-glow: #5A3A6F;         /* pink-purple horizon streak */
  --sky-ember: #C26A8A;        /* warm horizon pink */

  /* === ground === */
  --grass-deep: #1A3D3A;       /* deep teal-green */
  --grass-near: #245555;       /* nearer grass */
  --road: #4A3D2A;             /* warm brown winding path */
  --road-edge: #2E2618;        /* darker road edges */

  /* === streetlamp === */
  --lamp-on: #FFE08A;          /* warm yellow glow */
  --lamp-halo: rgba(255, 224, 138, 0.45);
  --lamp-halo-soft: rgba(255, 224, 138, 0.12);
  --lamp-off: #3A3530;         /* unlit lamp body */
  --lamp-post: #1F1A14;        /* dark post */

  /* === text === */
  --text: #E8DCC8;             /* warm cream */
  --text-dim: #8A7E6A;         /* muted */
  --text-bright: #FFF4DC;      /* highlight */

  /* === accents === */
  --neon-pink: #FF6B9D;        /* signs, hovers */
  --neon-cyan: #6BD5FF;        /* secondary accent */
  --completed: #9DFF6B;        /* completed lesson green-yellow */

  /* === shadow / depth === */
  --shadow: #0A0518;
  --vignette: rgba(10, 5, 24, 0.6);
}

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

html, body {
  background: var(--sky-deep);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* === retro pixel text utility === */
.pixel {
  font-family: 'Press Start 2P', monospace;
  letter-spacing: 0.04em;
  line-height: 1.4;
}

.mono {
  font-family: 'VT323', 'JetBrains Mono', ui-monospace, monospace;
  font-size: 1.15em;
  letter-spacing: 0.02em;
}

/* === CRT scanlines overlay (apply to body or wrapper) === */
.crt-scanlines::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 2px,
    rgba(0, 0, 0, 0.15) 3px,
    transparent 4px
  );
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: multiply;
}

/* === film grain overlay === */
.crt-grain::after {
  content: '';
  position: fixed;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.18 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  pointer-events: none;
  z-index: 9998;
  opacity: 0.55;
  mix-blend-mode: overlay;
  animation: grain 1.6s steps(4) infinite;
}
@keyframes grain {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(-2%, 1%); }
  50%  { transform: translate(1%, -1%); }
  75%  { transform: translate(-1%, 2%); }
  100% { transform: translate(0, 0); }
}

/* === vignette === */
.vignette::before {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 40%, var(--vignette) 100%);
  pointer-events: none;
  z-index: 9997;
}

/* === streetlamp shared sprite === */
.lamp {
  position: relative;
  display: inline-block;
  cursor: pointer;
  transition: transform 120ms ease-out;
}
.lamp:hover { transform: translateY(-2px); }

.lamp-post {
  width: 4px;
  height: 36px;
  background: var(--lamp-post);
  margin: 0 auto;
}
.lamp-head {
  width: 20px;
  height: 14px;
  background: var(--lamp-off);
  border-radius: 4px 4px 2px 2px;
  margin: 0 auto -2px;
  transition: background 200ms ease-out, box-shadow 300ms ease-out;
  position: relative;
}
.lamp.lit .lamp-head {
  background: var(--lamp-on);
  box-shadow:
    0 0 8px var(--lamp-on),
    0 0 24px var(--lamp-halo),
    0 0 48px var(--lamp-halo-soft);
  animation: lamp-flicker 4s ease-in-out infinite;
}
.lamp.lit::before {
  content: '';
  position: absolute;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle at center, var(--lamp-halo-soft) 0%, transparent 70%);
  top: -40px;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  z-index: -1;
}
.lamp.completed .lamp-head {
  background: var(--completed);
  box-shadow: 0 0 8px var(--completed), 0 0 24px rgba(157, 255, 107, 0.4);
}

@keyframes lamp-flicker {
  0%, 92%, 100% { opacity: 1; }
  93% { opacity: 0.7; }
  94% { opacity: 1; }
  95% { opacity: 0.85; }
  96% { opacity: 1; }
}

/* === hover-flicker (used when previewing on hub) === */
.lamp.previewing .lamp-head {
  background: var(--lamp-on);
  box-shadow: 0 0 8px var(--lamp-on), 0 0 24px var(--lamp-halo);
  animation: lamp-flicker 0.8s ease-in-out infinite;
}

/* === pixel sign === */
.sign {
  display: inline-block;
  background: #6B4E2E;
  border: 2px solid #3D2A14;
  color: var(--text-bright);
  padding: 6px 12px;
  font-family: 'Press Start 2P', monospace;
  font-size: 8px;
  letter-spacing: 0.05em;
  box-shadow: 0 2px 0 #3D2A14, 3px 3px 0 var(--shadow);
  transform: rotate(-2deg);
}
.sign.right { transform: rotate(2deg); }

/* === lesson-page chrome === */
.page-bg {
  position: fixed;
  inset: 0;
  background: linear-gradient(
    180deg,
    var(--sky-deep) 0%,
    var(--sky-dusk) 35%,
    var(--sky-glow) 60%,
    var(--sky-ember) 75%,
    var(--grass-deep) 85%,
    var(--grass-near) 100%
  );
  z-index: -2;
}

.page-stars {
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 20% 18%, #fff 50%, transparent),
    radial-gradient(1px 1px at 70% 12%, #fff 50%, transparent),
    radial-gradient(1px 1px at 45% 25%, #fff 50%, transparent),
    radial-gradient(2px 2px at 85% 20%, #fff 50%, transparent),
    radial-gradient(1px 1px at 10% 35%, #fff 50%, transparent),
    radial-gradient(1px 1px at 55% 8%, #fff 50%, transparent),
    radial-gradient(1px 1px at 90% 5%, #fff 50%, transparent),
    radial-gradient(1px 1px at 30% 30%, #fff 50%, transparent);
  background-size: 100% 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.7;
  animation: twinkle 6s ease-in-out infinite;
}
@keyframes twinkle {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 0.5; }
}

/* === lesson card === */
.lesson-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
  position: relative;
}

.lesson-card {
  background: rgba(26, 18, 48, 0.85);
  border: 1px solid var(--sky-glow);
  border-radius: 6px;
  padding: 40px 36px;
  backdrop-filter: blur(6px);
  box-shadow:
    0 0 0 1px rgba(255, 224, 138, 0.08) inset,
    0 8px 32px var(--shadow);
}

.lesson-meta {
  font-family: 'Press Start 2P', monospace;
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--neon-pink);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.lesson-title {
  font-family: 'Press Start 2P', monospace;
  font-size: 22px;
  line-height: 1.4;
  color: var(--text-bright);
  margin-bottom: 36px;
  text-shadow: 2px 2px 0 var(--shadow);
}

.lesson-section-h {
  font-family: 'Press Start 2P', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--lamp-on);
  text-transform: uppercase;
  margin: 36px 0 14px;
  border-bottom: 1px dashed var(--sky-glow);
  padding-bottom: 8px;
}

.lesson-card p {
  margin-bottom: 14px;
  color: var(--text);
}

.lesson-card ul, .lesson-card ol {
  margin: 8px 0 16px 20px;
}

.lesson-card li { margin-bottom: 6px; }

.lesson-card code {
  font-family: 'VT323', monospace;
  font-size: 1.15em;
  background: rgba(255, 107, 157, 0.12);
  color: var(--neon-pink);
  padding: 1px 6px;
  border-radius: 2px;
}

.lesson-card table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.92em;
}
.lesson-card th, .lesson-card td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid rgba(255, 224, 138, 0.12);
}
.lesson-card th {
  font-family: 'Press Start 2P', monospace;
  font-size: 8px;
  color: var(--neon-pink);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.listen {
  background: rgba(90, 58, 111, 0.25);
  border-left: 3px solid var(--lamp-on);
  padding: 18px 20px;
  margin: 18px 0 24px;
  border-radius: 0 4px 4px 0;
}
.listen .label {
  font-family: 'Press Start 2P', monospace;
  font-size: 8px;
  color: var(--lamp-on);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.listen .song {
  color: var(--text-dim);
  font-style: italic;
  font-size: 0.92em;
  margin: 6px 0 10px;
}
.listen audio { width: 100%; margin: 4px 0; }

/* lesson page nav */
.lesson-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px dashed var(--sky-glow);
}
.lesson-nav a {
  font-family: 'Press Start 2P', monospace;
  font-size: 9px;
  letter-spacing: 0.08em;
  color: var(--neon-cyan);
  text-decoration: none;
  text-transform: uppercase;
  transition: color 150ms ease-out;
}
.lesson-nav a:hover { color: var(--text-bright); }

.complete-btn {
  display: inline-block;
  font-family: 'Press Start 2P', monospace;
  font-size: 10px;
  letter-spacing: 0.05em;
  padding: 12px 20px;
  background: var(--sky-glow);
  color: var(--text-bright);
  border: 2px solid var(--lamp-on);
  border-radius: 4px;
  cursor: pointer;
  text-transform: uppercase;
  transition: all 150ms ease-out;
}
.complete-btn:hover {
  background: var(--lamp-on);
  color: var(--sky-deep);
  transform: translate(-1px, -1px);
  box-shadow: 2px 2px 0 var(--shadow);
}
.complete-btn.done {
  background: var(--completed);
  color: var(--sky-deep);
  border-color: var(--completed);
}

/* return-to-hub link */
.return-home {
  display: inline-block;
  font-family: 'Press Start 2P', monospace;
  font-size: 9px;
  color: var(--neon-pink);
  text-decoration: none;
  margin-bottom: 32px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.return-home:hover { color: var(--lamp-on); }