/* ============================================================
   base.css — shared design system for every nostalgia radio site
   Themes override the tokens in :root via their own theme.css.
   ============================================================ */

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

html,
body {
  height: 100%;
}

body {
  margin: 0;
  /* The page background lives here, NOT on .stage — .stage sits above
     .scene, so an opaque background there would hide every theme's art. */
  background: var(--bg-gradient, none), var(--bg);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow: hidden;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a {
  color: inherit;
}

/* ---------- stage ---------------------------------------------------- */

.stage {
  position: relative;
  min-height: 100dvh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 0;
  padding: clamp(16px, 4vw, 40px);
  background: transparent;
}

/* grain + vignette sit above the scene, below the content */
.stage::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  opacity: var(--grain-opacity, 0.05);
  background-image: var(--grain-url);
  background-size: 180px 180px;
  mix-blend-mode: var(--grain-blend, overlay);
}

.stage::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  /* Kept light — the vignette sits above .scene, and most themes park their
     art at the edges, which a heavy vignette swallows. */
  background: var(--vignette, radial-gradient(125% 105% at 50% 40%, transparent 55%, rgba(0, 0, 0, 0.42) 100%));
}

/* ---------- scene (theme-specific decoration) ------------------------ */

.scene {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.scene svg {
  display: block;
}

/* ---------- header --------------------------------------------------- */

.masthead {
  position: relative;
  z-index: 4;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.sign {
  font-family: var(--font-display);
  font-size: clamp(26px, 6vw, 48px);
  line-height: 1;
  letter-spacing: var(--sign-tracking, 0.01em);
  color: var(--sign-ink, var(--accent));
  text-transform: var(--sign-case, none);
  text-shadow: var(--sign-shadow, none);
  margin: 0;
}

.sign small {
  display: block;
  font-family: var(--font-body);
  font-size: clamp(10px, 2.4vw, 13px);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-top: 8px;
  text-shadow: none;
}

.masthead-links {
  display: flex;
  gap: 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.masthead-links a {
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
}

.masthead-links a:hover {
  color: var(--accent);
  border-bottom-color: currentColor;
}

/* ---------- now playing card ----------------------------------------- */

.center {
  position: relative;
  z-index: 4;
  display: grid;
  place-items: center;
  padding: 16px 0;
  min-height: 0; /* let the card shrink inside the grid row instead of clipping */
}

.card {
  width: min(420px, 100%);
  background: var(--surface);
  border: var(--card-border, 1px solid var(--line));
  border-radius: var(--card-radius, 4px);
  box-shadow: var(--card-shadow, 0 24px 60px rgba(0, 0, 0, 0.45));
  padding: clamp(16px, 4vw, 24px);
  backdrop-filter: var(--card-blur, none);
  text-align: center;
}

.art {
  position: relative;
  aspect-ratio: 1;
  /* Square, but capped by viewport height so the transport never gets
     pushed below the fold on short/landscape screens. */
  width: min(100%, 34dvh);
  margin: 0 auto;
  border-radius: var(--art-radius, 2px);
  overflow: hidden;
  background: var(--art-bg, rgba(0, 0, 0, 0.3));
  border: var(--art-border, 1px solid var(--line));
  display: grid;
  place-items: center;
}

.art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: var(--art-filter, none);
}

/* hqdefault fallback is a 4:3 frame with ~12.5% black bars baked into the top
   and bottom. Zoom just past them so the square crop shows only picture. */
.art img.art--letterboxed {
  transform: scale(1.35);
}

.art-fallback {
  font-family: var(--font-display);
  font-size: clamp(40px, 12vw, 72px);
  color: var(--accent);
  opacity: 0.4;
}

.track {
  margin-top: 16px;
  min-height: 56px;
}

.track-title {
  font-family: var(--font-display);
  font-size: clamp(19px, 4.6vw, 25px);
  line-height: 1.2;
  margin: 0;
  color: var(--ink);
}

.track-meta {
  margin: 6px 0 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

/* ---------- ticker ---------------------------------------------------- */

.ticker {
  margin-top: 12px;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 6px 0;
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent-2, var(--ink-dim));
  white-space: nowrap;
}

.ticker span {
  display: inline-block;
  padding-left: 100%;
  animation: ticker-scroll 18s linear infinite;
}

@keyframes ticker-scroll {
  to {
    transform: translateX(-100%);
  }
}

/* ---------- transport ------------------------------------------------- */

.transport {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
}

.tbtn {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--ink);
  border: 1px solid var(--line);
  transition: transform 0.12s ease, background 0.2s ease, color 0.2s ease;
}

.tbtn:hover {
  background: var(--accent);
  color: var(--on-accent, #000);
  border-color: transparent;
}

.tbtn:active {
  transform: scale(0.92);
}

.tbtn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.tbtn--main {
  width: 58px;
  height: 58px;
  background: var(--accent);
  color: var(--on-accent, #000);
  border-color: transparent;
}

.tbtn--main svg {
  width: 24px;
  height: 24px;
}

.tbtn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.volume {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-dim);
}

.volume svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
  flex: none;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  border-radius: 2px;
  background: var(--line);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 13px;
  height: 13px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

/* ---------- footer ---------------------------------------------------- */

.footer {
  position: relative;
  z-index: 4;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.footer a {
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.footer a:hover {
  color: var(--accent);
}

/* ---------- tap-to-play gate ------------------------------------------ */

.gate {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  background: var(--gate-bg, rgba(0, 0, 0, 0.82));
  backdrop-filter: blur(6px);
  text-align: center;
  padding: 24px;
  transition: opacity 0.45s ease, visibility 0.45s ease;
}

.gate[hidden] {
  display: grid;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.gate-inner {
  max-width: 420px;
}

.gate h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 8vw, 46px);
  margin: 0 0 12px;
  color: var(--accent);
  line-height: 1.05;
}

.gate p {
  margin: 0 0 28px;
  color: var(--ink-dim);
  font-size: 14px;
  line-height: 1.6;
}

.gate-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent, #000);
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 700;
  animation: gate-pulse 2.4s ease-in-out infinite;
}

.gate-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

@keyframes gate-pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.045);
  }
}

/* ---------- status / missing-id notice -------------------------------- */

.status {
  margin-top: 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
  min-height: 16px;
}

.status a {
  color: var(--accent);
}

/* hidden YouTube iframe host */
#yt-host {
  position: fixed;
  width: 1px;
  height: 1px;
  left: -9999px;
  top: 0;
  opacity: 0;
  pointer-events: none;
}

/* ---------- motion helpers -------------------------------------------- */

.spin {
  transform-box: fill-box;
  transform-origin: center;
  animation: spin 3.6s linear infinite;
}

.sway {
  transform-box: fill-box;
  transform-origin: top center;
  animation: sway 4.2s ease-in-out infinite;
}

.flicker {
  animation: flicker 5.5s steps(1, end) infinite;
}

.paused .spin,
.paused .sway {
  animation-play-state: paused;
}

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

@keyframes sway {
  0%, 100% {
    transform: rotate(-6deg);
  }
  50% {
    transform: rotate(6deg);
  }
}

@keyframes flicker {
  0%, 42%, 46%, 78%, 100% {
    opacity: 1;
  }
  44%, 80% {
    opacity: 0.35;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .ticker span {
    padding-left: 0;
  }
}

/* ---------- small screens --------------------------------------------- */

@media (max-width: 520px) {
  .masthead {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .footer {
    justify-content: center;
    text-align: center;
  }
}

@media (max-height: 700px) {
  .art {
    width: min(100%, 30dvh);
  }
  .ticker {
    display: none;
  }
}