/* OpenTelemetry Koans — Shared Styles */

:root {
  --bg-primary: #0a0e14;
  --bg-secondary: rgba(22, 27, 34, 0.55);
  --bg-tertiary: rgba(28, 33, 40, 0.4);
  --bg-glass: rgba(22, 27, 34, 0.45);
  --bg-glass-hover: rgba(30, 37, 46, 0.6);
  --border: rgba(48, 54, 61, 0.4);
  --border-subtle: rgba(48, 54, 61, 0.2);
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --text-muted: rgba(139, 148, 158, 0.5);
  --accent-blue: #58a6ff;
  --accent-green: #3fb950;
  --accent-orange: #d29922;
  --accent-red: #f85149;
  --accent-purple: #bc8cff;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-inset: rgba(0, 0, 0, 0.12) 0px -24px 36px 0px inset,
                  rgba(0, 0, 0, 0.08) 0px -48px 60px 0px inset;
  --shadow-glow: 0 0 40px rgba(0, 0, 0, 0.3);
  --blur: 12px;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.7;
  min-height: 100vh;
}

/* Page layout */
.koan-page {
  max-width: 880px;
  margin: 0 auto;
  padding: 4rem 2.5rem 50vh;
}

/* Koan number and navigation */
.koan-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 3rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.koan-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.koan-nav {
  display: flex;
  gap: 1.25rem;
}

.koan-nav a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.25em 0.5em;
  border-radius: 0.5em;
  transition: all 0.3s var(--ease-spring);
}

.koan-nav a:hover {
  color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.08);
}

/* The zen text */
.koan-text {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.9;
  max-width: 600px;
  margin: 0 auto 3rem;
  text-align: center;
  letter-spacing: 0.01em;
}

/* Koan title */
.koan-title {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 300;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

/* Interactive area */
.koan-interactive {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--border);
  border-radius: 1em;
  padding: 2rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-inset);
  transition: background 0.4s var(--ease-smooth),
              box-shadow 0.4s var(--ease-smooth);
}

/* Progress bar */
.koan-progress {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: transparent;
  z-index: 50;
}

.koan-progress-fill {
  height: 100%;
  background: var(--accent-green);
  opacity: 0.6;
  box-shadow: 0 0 8px rgba(63, 185, 80, 0.3);
  transition: width 0.6s var(--ease-smooth);
}

/* Buttons */
.koan-btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.5em 1.25em;
  border: 1px solid var(--border);
  border-radius: 0.5em;
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.3s var(--ease-spring);
  letter-spacing: 0.02em;
}

.koan-btn:hover {
  border-color: rgba(88, 166, 255, 0.3);
  color: var(--accent-blue);
  background: var(--bg-glass-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.koan-btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.koan-btn--primary {
  background: rgba(88, 166, 255, 0.15);
  border-color: rgba(88, 166, 255, 0.3);
  color: var(--accent-blue);
}

.koan-btn--primary:hover {
  background: rgba(88, 166, 255, 0.25);
  border-color: rgba(88, 166, 255, 0.5);
  color: #79c0ff;
}

/* Hint text */
.koan-hint {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 1.5rem;
  letter-spacing: 0.02em;
}

/* Completion state */
.koan-complete {
  text-align: center;
  padding: 2rem;
}

.koan-complete-text {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  color: var(--accent-green);
  margin-bottom: 1rem;
  opacity: 0.85;
}

/* Mobile gate — desktop only */
.mobile-gate {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg-primary);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}

.mobile-gate-icon {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  opacity: 0.5;
}

.mobile-gate-title {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}

.mobile-gate-text {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-secondary);
  max-width: 320px;
  line-height: 1.7;
}

/* Music toggle */
.music-toggle {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  z-index: 100;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background: var(--bg-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  opacity: 0.3;
  transition: all 0.3s var(--ease-spring);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  line-height: 1;
}

.music-toggle:hover {
  opacity: 0.7;
  transform: scale(1.1);
  border-color: var(--border);
}

.music-toggle.music-on {
  opacity: 0.5;
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .mobile-gate {
    display: flex;
  }
}