/* Nightcore Tracker public page. Mobile first; desktop enhancements at 48rem+. */

:root {
  --bg: #06071a;
  --bg-2: #0b0d2a;
  --panel: rgba(18, 20, 56, 0.78);
  --panel-solid: #12143a;
  --line: rgba(160, 150, 255, 0.18);
  --text: #eceeff;
  --muted: #a3a8d6;
  --violet: #a35cff;
  --cyan: #29e0ff;
  --red: #ff3d6e;
  --gold: #ffd166;
  --radius: 18px;
  /* Tablet/desktop reserve a gutter for the fixed vertical credit tab.
     On mobile the credit sits after the footer and needs no side gutter. */
  --credit-width: 2.25rem;
  --credit-gutter: calc(var(--credit-width) + 0.35rem + env(safe-area-inset-right, 0px));
  --credit-space: calc(1.5rem + env(safe-area-inset-bottom, 0px));
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  color-scheme: dark;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(60rem 40rem at 85% -10%, rgba(163, 92, 255, 0.22), transparent 60%),
    radial-gradient(50rem 30rem at -10% 30%, rgba(41, 224, 255, 0.12), transparent 60%),
    radial-gradient(40rem 30rem at 110% 80%, rgba(255, 61, 110, 0.12), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
  background-attachment: fixed;
  color: var(--text);
  font: 400 1rem/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "Noto Sans", "Noto Sans JP", sans-serif;
  padding-right: var(--credit-gutter);
  padding-left: env(safe-area-inset-left, 0px);
  padding-bottom: var(--credit-space);
}

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

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 20;
  padding: 0.5rem 1rem;
  background: var(--panel-solid);
  border: 1px solid var(--cyan);
  border-radius: 999px;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

.collection-warning {
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--gold);
  background: var(--panel-solid);
  color: var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* --- Header ----------------------------------------------------------- */

.masthead {
  position: relative;
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 0.75rem;
}

.masthead-inner {
  position: relative;
  z-index: 1;
}

.eyebrow {
  margin: 0;
  color: var(--cyan);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.logo {
  margin: 0.15rem 0 0.35rem;
  font-size: clamp(2rem, 9vw, 3.75rem);
  line-height: 1;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--violet);
  text-shadow: 0 0 18px rgba(163, 92, 255, 0.75), 0 0 42px rgba(163, 92, 255, 0.35);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.meta time {
  color: var(--text);
  font-weight: 600;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.35rem 0 0.6rem;
}

.site-nav a {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(18, 20, 56, 0.6);
  color: var(--text);
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover {
  border-color: var(--cyan);
}

.site-nav a[aria-current="page"] {
  border-color: var(--cyan);
  background: rgba(41, 224, 255, 0.14);
}

.date-picker {
  margin-top: 0.9rem;
}

.date-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.4rem;
  max-width: 32rem;
}

.date-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.05rem;
  min-height: 3.25rem;
  padding: 0.4rem 0.25rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(18, 20, 56, 0.6);
  color: var(--text);
  font: inherit;
  font-size: 0.8125rem;
  line-height: 1.2;
  cursor: pointer;
  touch-action: manipulation;
  transition: border-color 0.2s, background-color 0.2s, box-shadow 0.2s;
}

.date-btn-day {
  color: var(--muted);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.date-btn-date {
  font-weight: 700;
}

.date-btn-note {
  font-size: 0.625rem;
  color: var(--muted);
}

.date-btn[aria-pressed="true"] {
  border-color: var(--cyan);
  background: rgba(41, 224, 255, 0.14);
  box-shadow: 0 0 0 1px var(--cyan), 0 0 18px rgba(41, 224, 255, 0.35);
}

.date-btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.45;
  border-style: dashed;
}

.date-btn[aria-busy="true"] {
  cursor: progress;
}

/* --- Character artwork slots ------------------------------------------ */
/* Placeholders until authorized artwork exists. Replace the background with
   the optimized cutout (for example assets/crimson-host.webp). */

.art-slot {
  pointer-events: none;
  background: url("host-slot.svg") center / contain no-repeat;
  opacity: 0.55;
}

.art-slot--host {
  display: none;
  position: absolute;
  right: 0.5rem;
  top: 0.5rem;
  width: 6.5rem;
  height: 6.5rem;
}

/* Only show the host slot once there is room beside the title. */
@media (min-width: 36rem) {
  .art-slot--host {
    display: block;
  }
}

.art-slot--side,
.art-slot--closing {
  display: none;
}

/* --- Boards and cards --------------------------------------------------- */

main {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1rem;
  transition: opacity 0.18s var(--ease);
}

main.is-swapping {
  opacity: 0.25;
}

.board {
  position: relative;
  margin: 1.25rem 0 2.5rem;
}

.board-head h2,
.closing h2 {
  margin: 0;
  font-size: clamp(1.5rem, 6vw, 2.25rem);
  line-height: 1.1;
}

.board--songs h2 {
  color: var(--text);
  text-shadow: 0 0 16px rgba(255, 61, 110, 0.55);
}

.board--channels h2 {
  text-shadow: 0 0 16px rgba(41, 224, 255, 0.55);
}

.board--growth h2,
.board--rising h2 {
  text-shadow: 0 0 16px rgba(163, 92, 255, 0.6);
}

.board-note {
  margin: 0.25rem 0 0.9rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.card {
  --accent: var(--violet);
  position: relative;
  display: grid;
  grid-template-columns: 7.5rem minmax(0, 1fr);
  gap: 0.75rem;
  align-items: start;
  min-width: 0;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.cards--songs .card {
  --accent: var(--red);
}

.cards--channels .card {
  --accent: var(--cyan);
  grid-template-columns: 4.25rem minmax(0, 1fr);
}

/* Rising channels share the channel layout; violet marks percentage charts. */
.cards--rising .card {
  --accent: var(--violet);
}

.card-thumb {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 12px;
  background: #000;
}

.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar {
  display: block;
  width: 4.25rem;
  height: 4.25rem;
  border-radius: 50%;
  overflow: hidden;
  background: var(--panel-solid);
  box-shadow: 0 0 0 2px var(--accent), 0 0 18px rgba(41, 224, 255, 0.35);
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-fallback {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--cyan);
}

.rank {
  position: absolute;
  left: -0.35rem;
  top: -0.6rem;
  min-width: 2.1rem;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: 800;
  font-size: 1rem;
  text-align: center;
  text-shadow: 0 0 10px var(--accent);
  box-shadow: 0 0 14px rgba(0, 0, 0, 0.5);
}

.card-body {
  min-width: 0;
}

.card-title {
  margin: 0;
  font-size: 0.975rem;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.card-title a {
  text-decoration: none;
}

.card-title a:hover {
  text-decoration: underline;
}

.card-sub {
  margin: 0.15rem 0 0.4rem;
  color: var(--muted);
  font-size: 0.8125rem;
  overflow-wrap: anywhere;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.9rem;
  margin: 0;
}

.stat {
  min-width: 0;
}

.stat dt {
  color: var(--muted);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.stat dd {
  margin: 0;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stat--accent dd {
  color: var(--accent);
  text-shadow: 0 0 12px var(--accent);
}

.move {
  position: absolute;
  right: 0.6rem;
  top: 0.6rem;
  margin: 0;
  padding: 0.05rem 0.45rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
}

.move--up {
  color: #5dffb0;
}

.move--down {
  color: var(--red);
}

.move--new {
  color: var(--bg);
  background: var(--gold);
}

.move--entry {
  color: var(--bg);
  background: var(--cyan);
}

.card-body .card-title {
  padding-right: 2.75rem;
}

/* The leading breakout song gets a larger composition and is visible on load. */
.card--lead {
  grid-template-columns: minmax(0, 1fr);
  padding: 0.9rem;
  border-color: rgba(255, 61, 110, 0.55);
  box-shadow: 0 0 0 1px rgba(255, 61, 110, 0.35), 0 18px 50px rgba(255, 61, 110, 0.18),
    0 12px 40px rgba(0, 0, 0, 0.45);
}

.card--lead .rank {
  font-size: 1.5rem;
  min-width: 3rem;
}

.card--lead .card-title {
  font-size: 1.25rem;
}

.card--lead .stat dd {
  font-size: 1.15rem;
}

.empty {
  color: var(--muted);
  font-style: italic;
}

/* Reserved, disabled advertisement slot: fixed height avoids layout shifts. */
.ad-slot {
  min-height: 6.5rem;
  margin: 0 0 2rem;
  border: 1px dashed rgba(160, 150, 255, 0.12);
  border-radius: var(--radius);
}

/* --- Closing ------------------------------------------------------------ */

.closing {
  position: relative;
  margin: 2rem 0 1rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 13, 42, 0.8);
}

.closing h3 {
  margin: 1.25rem 0 0.4rem;
  color: var(--cyan);
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.closing p {
  color: var(--muted);
  font-size: 0.9rem;
}

.summary {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
}

.summary li {
  margin: 0.2rem 0;
  overflow-wrap: anywhere;
}

.coverage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem 1rem;
  margin: 0;
}

.coverage dt {
  color: var(--muted);
  font-size: 0.75rem;
}

.coverage dd {
  margin: 0;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.fine {
  font-size: 0.8rem;
  overflow-wrap: anywhere;
}

.fine code {
  font-size: 0.75rem;
  color: var(--text);
}

.site-footer {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1rem 1rem 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  margin-top: 0.25rem;
}

.footer-links a {
  display: inline-block;
  padding: 0.35rem 0;
  color: var(--text);
}

/* --- Legal pages ---------------------------------------------------------- */

.legal {
  max-width: 48rem;
}

.legal .closing a,
.legal-page .eyebrow a {
  color: var(--cyan);
}

.legal .closing h2 {
  margin-bottom: 0.25rem;
}

/* --- ESR credit ----------------------------------------------------------- */

.esr-credit {
  position: fixed;
  right: env(safe-area-inset-right, 0px);
  bottom: max(0.75rem, env(safe-area-inset-bottom, 0px));
  z-index: 10;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  box-sizing: border-box;
  width: var(--credit-width);
  min-height: 7.5rem;
  padding: 0.75rem 0;
  /* Reads bottom to top; the rotation keeps the tab hugging the right edge. */
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  border: 1px solid rgba(255, 61, 110, 0.6);
  border-left-width: 0;
  border-radius: 0 12px 12px 0;
  background: rgba(6, 7, 26, 0.92);
  color: var(--text);
  font-size: 0.8125rem;
  line-height: 1;
  white-space: nowrap;
  text-decoration: none;
  box-shadow: 0 0 18px rgba(255, 61, 110, 0.35);
}

.esr-credit strong {
  color: var(--red);
  text-shadow: 0 0 10px rgba(255, 61, 110, 0.8);
}

.esr-credit:hover {
  border-color: var(--red);
}

.esr-credit:focus-visible {
  /* Drawn inside so the focus ring is not clipped by the viewport edge. */
  outline: 3px solid var(--cyan);
  outline-offset: -4px;
  border-radius: 0 12px 12px 0;
}

/* Mobile cards use the full content width with balanced side padding.
   Keep the credit in normal flow so it cannot cover cards or controls. */
@media (max-width: 47.999rem) {
  body {
    padding-right: env(safe-area-inset-right, 0px);
  }

  .esr-credit {
    position: static;
    display: flex;
    width: fit-content;
    max-width: calc(100% - 2rem);
    min-height: 2.75rem;
    margin: 1rem auto 0;
    padding: 0.65rem 1rem;
    writing-mode: horizontal-tb;
    transform: none;
    border-left-width: 1px;
    border-radius: 999px;
  }

  .esr-credit:focus-visible {
    border-radius: 999px;
  }
}

/* --- Entrance animation (enabled by app.js only) ------------------------ */

.reveal-pending {
  opacity: 0;
  transform: translate3d(0, 1.5rem, 0) scale(0.98);
}

.reveal-in {
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
  transition-delay: calc(min(var(--i, 0), 6) * 55ms);
}

/* --- Desktop -------------------------------------------------------------- */

@media (min-width: 48rem) {
  .masthead {
    padding: 2rem 1.5rem 1rem;
  }

  main {
    padding: 0 1.5rem;
  }

  .art-slot--host {
    width: 11rem;
    height: 11rem;
    right: 1.5rem;
    top: 0.75rem;
  }

  .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem 1.5rem;
  }

  /* Alternate depth: even cards float lower with a softer shadow. */
  .cards > .card:nth-child(even) {
    translate: 0 1.25rem;
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.45);
  }

  .cards > .card--lead {
    grid-column: 1 / -1;
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: center;
    gap: 1.25rem;
    padding: 1.25rem;
  }

  /* Breakout songs open with the full-width lead card, so its zigzag shifts. */
  .cards--growth > .card:nth-child(even) {
    translate: none;
  }

  .cards--growth > .card:nth-child(odd):not(.card--lead) {
    translate: 0 1.25rem;
  }

  .card--lead .card-title {
    font-size: 1.6rem;
  }

  .card {
    grid-template-columns: 9rem minmax(0, 1fr);
  }

  .board--channels {
    padding-right: 0;
  }

  .art-slot--side {
    display: block;
    position: absolute;
    right: -1rem;
    top: -3.5rem;
    width: 8rem;
    height: 8rem;
  }

  .art-slot--closing {
    display: block;
    position: absolute;
    right: 1rem;
    bottom: 1rem;
    width: 7rem;
    height: 7rem;
    opacity: 0.3;
  }

  .closing {
    padding: 1.75rem 2rem;
  }

  .closing-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 2rem;
  }

  .coverage {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 72rem) {
  /* Wide screens: mirror the credit gutter so the centred content stays
     centred; the right side keeps the full reservation. */
  body {
    padding-left: calc(var(--credit-width) + 0.35rem + env(safe-area-inset-left, 0px));
  }

  .cards--channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .cards--channels > .card:nth-child(even) {
    translate: none;
  }

  .cards--channels > .card:nth-child(3n + 2) {
    translate: 0 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }

  .reveal-pending {
    opacity: 1;
    transform: none;
  }
}