/* =====================================================================
   BASE — design tokens, reset, shared layout
   ===================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@600;700;800&family=Rajdhani:wght@500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* --- color: dark GD-inspired base with a neon spike gradient --- */
  --bg-void:      #07080d;
  --bg-base:      #0b0d14;
  --bg-surface:   #12151f;
  --bg-surface-2: #191d2b;
  --line:         #262b3d;
  --line-soft:    #1b1f2e;

  --text-hi:      #eef0f7;
  --text-mid:     #aab0c4;
  --text-dim:     #6d7286;

  --cyan:         #3ef2d8;
  --violet:       #8a6bff;
  --magenta:      #ff4fb8;
  --gold:         #ffcf4a;

  /* difficulty tiers, cool -> hot as requirement % rises */
  --tier-1: #3ef2d8; /* easy demon territory */
  --tier-2: #5a9dff;
  --tier-3: #8a6bff;
  --tier-4: #c060ff;
  --tier-5: #ff4fb8;
  --tier-6: #ff5a5a; /* top-of-list extreme */

  --spike-gradient: linear-gradient(120deg, var(--cyan), var(--violet) 45%, var(--magenta) 85%);

  --radius: 3px;
  --cut: 14px; /* corner-cut size for the "spike" card shape */

  --shadow-card: 0 1px 0 rgba(255,255,255,0.02) inset, 0 12px 24px -16px rgba(0,0,0,0.6);
}

* { box-sizing: border-box; }
html { color-scheme: dark; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg-base);
  background-image:
    radial-gradient(1200px 600px at 12% -10%, rgba(138,107,255,0.10), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(62,242,216,0.08), transparent 55%);
  color: var(--text-hi);
  font-family: 'Inter', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

h1, h2, h3, .num {
  font-family: 'Rajdhani', 'Inter', sans-serif;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0;
}

.mono { font-family: 'JetBrains Mono', monospace; }

a { color: inherit; text-decoration: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

img { max-width: 100%; display: block; }

::selection { background: var(--violet); color: #05060a; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* --- reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* =====================================================================
   SITE HEADER
   ===================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px clamp(16px, 4vw, 40px);
  background: rgba(10, 11, 17, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 30px;
  height: 30px;
  background: var(--spike-gradient);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  flex-shrink: 0;
}

.brand-text {
  font-family: 'Orbitron', sans-serif;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.1;
}

.brand-text span {
  display: block;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-top: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text-mid);
  background: var(--bg-surface);
  transition: color .15s, border-color .15s;
}
.icon-btn:hover { color: var(--text-hi); border-color: var(--text-dim); }

/* =====================================================================
   SHARED: page shell / states
   ===================================================================== */

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px clamp(16px, 4vw, 40px) 80px;
}

.state-banner {
  border: 1px solid var(--line);
  background: var(--bg-surface);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 13px;
  color: var(--text-mid);
  margin-bottom: 16px;
}
.state-banner.error { border-color: #5c2233; color: #ffb4c6; background: #1a0f14; }
.state-banner a { color: var(--cyan); text-decoration: underline; text-underline-offset: 2px; }

.skeleton {
  background: linear-gradient(100deg, var(--bg-surface) 30%, var(--bg-surface-2) 50%, var(--bg-surface) 70%);
  background-size: 200% 100%;
  animation: shimmer 1.3s infinite;
  border-radius: var(--radius);
}
@keyframes shimmer { to { background-position: -200% 0; } }

.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  border: 1px solid var(--line);
  color: var(--text-mid);
  background: var(--bg-surface-2);
}

/* =====================================================================
   MODAL (YouTube key entry)
   ===================================================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(4,5,9,0.72);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

.modal-box {
  width: 100%;
  max-width: 420px;
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 24px 60px -20px rgba(0,0,0,0.7);
}

.modal-box h3 {
  font-family: 'Rajdhani', sans-serif;
  font-size: 18px;
  margin-bottom: 8px;
}

.modal-box p {
  font-size: 12.5px;
  color: var(--text-mid);
  line-height: 1.6;
  margin: 0 0 14px;
}
.modal-box p a { color: var(--cyan); text-decoration: underline; text-underline-offset: 2px; }

.modal-box input {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-surface-2);
  color: var(--text-hi);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  margin-bottom: 14px;
}
.modal-box input:focus { outline: 2px solid var(--cyan); outline-offset: 1px; }

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.btn-primary, .btn-ghost {
  padding: 9px 16px;
  border-radius: var(--radius);
  font-size: 12.5px;
  font-weight: 600;
}
.btn-primary { background: var(--cyan); color: var(--bg-void); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { color: var(--text-mid); border: 1px solid var(--line); }
.btn-ghost:hover { color: var(--text-hi); }

.footer-note {
  text-align: center;
  color: var(--text-dim);
  font-size: 11.5px;
  padding: 40px 20px 10px;
  line-height: 1.7;
}
.footer-note a { color: var(--text-mid); text-decoration: underline; text-underline-offset: 2px; }