/* learn.thisisthenext.com — Apple dark mode personal learning site */

:root {
  --bg: #000000;
  --bg-elevated: #1c1c1e;
  --bg-card: #2c2c2e;
  --bg-card-hover: #3a3a3c;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.15);

  --text: #ffffff;
  --text-muted: #98989d;
  --text-dim: #6e6e73;

  --accent: #0a84ff;
  --accent-bright: #409cff;
  --accent-deep: #0058a8;
  --accent-bg: rgba(10, 132, 255, 0.12);
  --accent-border: rgba(10, 132, 255, 0.3);

  --good: #30d158;
  --bad: #ff453a;
  --warn: #ff9f0a;
  --purple: #bf5af2;

  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Roboto Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, sans-serif;
}

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

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

::selection { background: var(--accent); color: var(--text); }

/* Subtle dot grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

a { color: var(--accent-bright); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============================================
   Auth gate overlay
   ============================================ */

#authOverlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  transition: opacity 0.3s, visibility 0.3s;
}

#authOverlay.auth-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.auth-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3rem;
  width: min(420px, 90vw);
  text-align: center;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
}

.auth-card h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
  letter-spacing: -0.025em;
}

.auth-card .subtitle {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.auth-card form { display: flex; flex-direction: column; gap: 0.75rem; }

.auth-card input {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  transition: border-color 0.2s, background 0.2s;
}

.auth-card input::placeholder { color: var(--text-dim); }
.auth-card input:focus { outline: none; border-color: var(--accent); background: var(--bg-card-hover); }

.auth-card button {
  background: var(--accent);
  color: var(--text);
  border: none;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.05s;
  margin-top: 0.25rem;
}

.auth-card button:hover { background: var(--accent-bright); }
.auth-card button:active { transform: scale(0.98); }
.auth-card .error { color: var(--bad); font-size: 0.9rem; min-height: 1.25rem; }

/* ============================================
   Top bar
   ============================================ */

.top-bar {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 100;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-size: 0.9rem;
  color: var(--text);
  font-weight: 500;
  letter-spacing: -0.005em;
}

.brand a { color: var(--text); text-decoration: none; }
.brand .accent { color: var(--accent-bright); }
.brand .sep { color: var(--text-dim); margin: 0 0.5rem; }
.brand .muted { color: var(--text-muted); font-size: 0.85rem; }

.brand-right {
  font-size: 0.78rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.brand-right a { color: var(--text-dim); }
.brand-right a:hover { color: var(--accent-bright); text-decoration: none; }

/* ============================================
   Landing page
   ============================================ */

.landing-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 4rem 1.5rem 4rem;
  position: relative;
  z-index: 1;
}

.landing-inner .tagline {
  color: var(--accent-bright);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 0.65rem;
  text-align: center;
  font-weight: 600;
}

.landing-inner h1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  text-align: center;
  margin-bottom: 1rem;
}

.landing-inner .subtitle {
  color: var(--text-muted);
  text-align: center;
  margin: 0 auto 3.5rem;
  font-size: 1.05rem;
  line-height: 1.55;
  max-width: 60ch;
}

.season-block {
  margin-bottom: 3rem;
}

.season-block h2 {
  font-size: 1.5rem;
  margin-bottom: 0.35rem;
  letter-spacing: -0.015em;
}

.season-block .season-blurb {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  max-width: 65ch;
  line-height: 1.55;
}

.episode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}

.episode-tile {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem;
  color: var(--text);
  transition: border-color 0.2s, transform 0.15s, background 0.2s;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-decoration: none;
}

.episode-tile:hover {
  border-color: var(--accent-border);
  background: linear-gradient(135deg, var(--bg-elevated), var(--accent-bg));
  transform: translateY(-2px);
  text-decoration: none;
}

.episode-tile .ep-number {
  color: var(--accent-bright);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.episode-tile h3 {
  color: var(--text);
  font-size: 1.2rem;
  margin: 0;
  letter-spacing: -0.015em;
  font-weight: 600;
}

.episode-tile p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0;
  line-height: 1.5;
}

.episode-tile .ep-meta {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

.episode-tile .ep-meta span {
  background: var(--bg-card);
  color: var(--text-dim);
  font-size: 0.7rem;
  padding: 0.2rem 0.55rem;
  border-radius: 5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.episode-tile .ep-meta span.has-audio { color: var(--accent-bright); background: var(--accent-bg); }
.episode-tile .ep-meta span.has-demo { color: var(--good); background: rgba(48, 209, 88, 0.12); }
.episode-tile .ep-meta span.has-handson { color: var(--purple); background: rgba(191, 90, 242, 0.12); }

.coming-soon {
  background: var(--bg-card);
  border: 1px dashed var(--border-strong);
  border-radius: 14px;
  padding: 2rem;
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.55;
}

.coming-soon strong { color: var(--text-muted); }

/* ============================================
   Episode page
   ============================================ */

.episode-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 4rem 1.5rem 4rem;
  position: relative;
  z-index: 1;
}

.episode-header {
  margin-bottom: 2rem;
}

.eyebrow {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-bright);
  font-weight: 600;
  margin-bottom: 0.85rem;
}

.episode-header h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin: 0.5rem 0;
  letter-spacing: -0.025em;
  line-height: 1.15;
  font-weight: 700;
}

.episode-description {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-top: 0.65rem;
}

/* Sticky audio player */
.episode-player {
  position: sticky;
  top: 64px;
  z-index: 50;
  background: rgba(28, 28, 30, 0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
}

.ep-playpause {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s, transform 0.05s;
  font-family: var(--sans);
}

.ep-playpause:hover { background: var(--accent-bright); }
.ep-playpause:active { transform: scale(0.96); }

.ep-time {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.ep-scrub {
  flex: 1;
  height: 6px;
  background: var(--bg-card);
  border-radius: 3px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.ep-scrub-fill {
  height: 100%;
  background: var(--accent);
  width: 0;
  border-radius: 3px;
  transition: width 0.15s linear;
}

.ep-speed {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.5rem;
  font-family: var(--sans);
  font-size: 0.82rem;
  cursor: pointer;
  flex-shrink: 0;
}

.ep-speed:focus { outline: none; border-color: var(--accent); }

/* Transcript */
.transcript-panel {
  color: var(--text);
  line-height: 1.7;
  font-size: 1.05rem;
}

.transcript-panel h1,
.transcript-panel h2,
.transcript-panel h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  letter-spacing: -0.015em;
}

.transcript-panel h2 { font-size: 1.5rem; color: var(--accent-bright); }
.transcript-panel h3 { font-size: 1.2rem; color: var(--text); }

.transcript-paragraph {
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0 0 1.15rem;
  color: var(--text);
  cursor: pointer;
  padding: 0.4rem 0.65rem;
  margin-left: -0.65rem;
  margin-right: -0.65rem;
  border-radius: 8px;
  transition: background 0.2s;
  border-left: 3px solid transparent;
}

.transcript-paragraph:hover { background: var(--bg-card); }

.transcript-paragraph.active {
  background: var(--accent-bg);
  border-left-color: var(--accent);
}

.transcript-panel ul, .transcript-panel ol {
  margin: 0 0 1.15rem 1.5rem;
  padding: 0;
}

.transcript-panel li {
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0.35rem 0;
}

.transcript-panel strong { color: var(--text); font-weight: 600; }
.transcript-panel em { color: var(--accent-bright); font-style: italic; }
.transcript-panel a { color: var(--accent-bright); }

.transcript-panel code {
  background: var(--bg-card);
  color: var(--accent-bright);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  border: 1px solid var(--border);
  font-family: var(--mono);
}

.transcript-panel blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1.25rem;
  margin: 1rem 0;
  color: var(--text-muted);
  font-style: italic;
}

/* Demo + handson sections */
.demo-section,
.handson-section {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.demo-section h2,
.handson-section h2 {
  font-size: 1.65rem;
  margin-bottom: 0.5rem;
  letter-spacing: -0.015em;
}

.demo-section .muted,
.handson-section .muted {
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.demo-frame {
  width: 100%;
  height: 600px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-elevated);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.handson-content {
  color: var(--text);
  line-height: 1.65;
  font-size: 1.05rem;
}

.handson-content h3 {
  color: var(--accent-bright);
  font-size: 1.2rem;
  margin: 1.5rem 0 0.5rem;
}

.handson-content code {
  background: var(--bg-card);
  color: var(--accent-bright);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  border: 1px solid var(--border);
  font-family: var(--mono);
}

.handson-content pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1rem 0;
}

.handson-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
}

.episode-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.episode-nav a {
  color: var(--accent-bright);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.65rem 1rem;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  transition: border-color 0.2s, background 0.2s;
  max-width: 45%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.episode-nav a:hover {
  border-color: var(--accent-border);
  background: var(--accent-bg);
  text-decoration: none;
}

.error {
  color: var(--bad);
  padding: 1rem;
  background: rgba(255, 69, 58, 0.1);
  border: 1px solid rgba(255, 69, 58, 0.3);
  border-radius: 8px;
}

.muted { color: var(--text-muted); }

/* Responsive */
@media (max-width: 640px) {
  .landing-inner, .episode-page { padding: 3rem 1rem 3rem; }
  .episode-player { flex-wrap: wrap; gap: 0.5rem; padding: 0.65rem 0.75rem; }
  .ep-scrub { order: 5; flex-basis: 100%; }
  .demo-frame { height: 480px; }
  .episode-grid { grid-template-columns: 1fr; }
  .top-bar { padding: 0 1rem; }
}