/* Design tokens and shared primitives.
   Page-specific rules live in playlists.css / graph.css. */

:root {
  --bg:            #121212;
  --bg-elevated:   #181818;
  --bg-hover:      #232323;
  --border:        #2a2a2a;
  --text:          #f5f5f5;
  --text-muted:    #a7a7a7;
  --accent:        #1db954;
  --accent-hover:  #1ed760;
  --danger:        #e2564a;
  --radius:        8px;
  --radius-lg:     14px;
  --topbar-height: 60px;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

/* The UA sheet gives [hidden] `display: none`, but any later rule carrying its
   own display silently wins -- `.btn { display: inline-flex }` is why a hidden
   "Load more" button rendered anyway. */
[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------------------------------------------------------------- topbar */

.topbar {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  /* `space-between` leaves nothing between the brand and the nav once the two
     grow wide enough to meet -- measured on a 375px viewport they ended up
     touching at the same x. This guarantees a gutter instead. */
  gap: 1rem;
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  /* The bar is a fixed 60px, so a wrapped brand does not grow it -- the second
     line overflows. A two-word name wraps at 320px without this. */
  white-space: nowrap;
}

.topbar__mark {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(29, 185, 84, 0.18);
  /* A fixed width is still shrinkable in flex; without this the dot ovals out
     once the bar is tight. */
  flex: 0 0 auto;
}

.topbar__nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 0 0 auto;
}

.topbar__link { color: var(--text-muted); font-size: 0.9rem; white-space: nowrap; }
.topbar__link:hover { color: var(--text); }

/* Phones. The three items in this bar need ~343px of content box at the
   desktop sizes and a 375px screen only offers 327, so reclaim the difference
   from padding and type rather than letting anything collide. */
@media (max-width: 700px) {
  .topbar { padding: 0 0.875rem; }
  .topbar__brand { font-size: 0.9rem; gap: 0.5rem; }
  .topbar__nav { gap: 0.625rem; }
}

/* Below ~360px even that is not enough for brand + login + Source. Source is
   the one that goes: it is a convenience link to the repo, whereas the login
   button is the page's only call to action. */
@media (max-width: 360px) {
  .topbar__link { display: none; }
}

.topbar__user {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.topbar__avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}

/* ---------------------------------------------------------------- layout */

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.page--centered {
  min-height: calc(100vh - var(--topbar-height));
  display: grid;
  place-items: center;
  text-align: center;
}

/* ------------------------------------------------------------------ hero */

.hero { max-width: 640px; }

.hero__status {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent);
  margin: 0;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
}

.hero__title--sm { font-size: 1.8rem; }

.hero__subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0 0 2rem;
}

.hero__points {
  list-style: none;
  padding: 0;
  margin: 2.5rem 0 0;
  text-align: left;
  display: grid;
  gap: 0.75rem;
}

.hero__points li {
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-muted);
}

.hero__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.hero__note {
  margin-top: 2.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  opacity: 0.75;
}

/* --------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.6rem 1.25rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s, opacity 0.15s;
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn--primary { background: var(--accent); color: #05240f; }
.btn--primary:hover:not(:disabled) { background: var(--accent-hover); }

.btn--ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-muted);
}
.btn--ghost:hover:not(:disabled) { border-color: var(--text-muted); color: var(--text); }

.btn--sm { padding: 0.4rem 0.9rem; font-size: 0.85rem; }
.btn--lg { padding: 0.85rem 2rem; font-size: 1.05rem; }

/* --------------------------------------------------------------- inputs */

.search { display: block; }

.search input {
  width: 100%;
  max-width: 340px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font: inherit;
  padding: 0.55rem 1rem;
}

.search input::placeholder { color: var(--text-muted); }
.search input:focus { outline: none; border-color: var(--accent); }
.search--sm input { max-width: 200px; padding: 0.35rem 0.85rem; font-size: 0.85rem; }

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.toggle input { accent-color: var(--accent); cursor: pointer; }

/* -------------------------------------------------------- flash / status */

.flashes {
  max-width: 1200px;
  margin: 1rem auto 0;
  padding: 0 1.5rem;
  display: grid;
  gap: 0.5rem;
}

.flash {
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  font-size: 0.9rem;
}

.flash--error { border-color: var(--danger); color: #ffb3ac; }
.flash--info  { border-color: var(--accent); }

.status {
  color: var(--text-muted);
  font-size: 0.9rem;
  min-height: 1.5rem;
  margin-bottom: 1rem;
}

.status--error { color: #ffb3ac; }

/* ---------------------------------------------------------- section head */

.section-head { margin-bottom: 2rem; }

.section-head__title {
  font-size: 2rem;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
}

.section-head__subtitle {
  color: var(--text-muted);
  margin: 0 0 1.25rem;
  max-width: 60ch;
}

/* --------------------------------------------------------------- loader */

.loader {
  display: grid;
  place-items: center;
  gap: 0.75rem;
  text-align: center;
  padding: 4rem 1.5rem;
}

.loader__spinner {
  width: 34px;
  height: 34px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loader__text { margin: 0; font-weight: 600; }
.loader__hint { margin: 0; font-size: 0.82rem; color: var(--text-muted); max-width: 42ch; }

@media (prefers-reduced-motion: reduce) {
  .loader__spinner { animation-duration: 3s; }
  .btn:active { transform: none; }
}