/* AniBT Error Pages — unified type + calm card
   Shared by error pages and challenge pages. */

:root {
  color-scheme: dark;

  /* Wallpaper */
  --bg-image: url("https://i.anibt.net/image-host/2026/08/05/MpQeLHJ/image-MpQeLHJ.webp");

  /* Palette — aligned with AniBT brand */
  --pink: #ff6b9d;
  --pink-hover: #ff7fab;
  --text: #f5f5f7;
  --text-2: rgba(245, 245, 247, 0.78);
  --text-3: rgba(245, 245, 247, 0.52);
  --line: rgba(255, 255, 255, 0.1);
  --line-strong: rgba(255, 255, 255, 0.16);
  --surface: rgba(18, 14, 26, 0.72);
  --surface-solid: rgba(16, 12, 22, 0.92);
  --surface-soft: rgba(255, 255, 255, 0.06);
  --shadow:
    0 28px 64px rgba(0, 0, 0, 0.42),
    0 2px 8px rgba(0, 0, 0, 0.22);

  /* Type stack: one family for UI, mono only for IDs */
  --font:
    "PingFang SC", "Hiragino Sans GB", "Noto Sans SC",
    -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    system-ui, sans-serif;
  --font-display:
    "PingFang SC", "Hiragino Sans GB", "Noto Sans SC",
    -apple-system, BlinkMacSystemFont, "SF Pro Display",
    system-ui, sans-serif;
  --mono:
    ui-monospace, "SF Mono", "JetBrains Mono", SFMono-Regular,
    Menlo, Consolas, monospace;

  /* Type scale */
  --fs-code: clamp(2.5rem, 8vw, 3.25rem);
  --fs-title: 1.1875rem;   /* 19px */
  --fs-body: 0.9375rem;    /* 15px */
  --fs-ui: 0.875rem;       /* 14px */
  --fs-meta: 0.75rem;      /* 12px */
  --fs-tiny: 0.6875rem;    /* 11px */

  --lh-tight: 1.2;
  --lh-title: 1.35;
  --lh-body: 1.65;
  --tracking-title: -0.02em;
  --tracking-code: -0.035em;

  /* Layout */
  --card-w: min(24.5rem, calc(100vw - 2rem));
  --card-pad-x: 1.75rem;
  --card-pad-y: 1.85rem;
  --radius: 20px;
  --radius-sm: 12px;
  --gap: 0.75rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text);
  background: #0a0810;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* —— Stage —— */
.stage {
  position: relative;
  isolation: isolate;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding:
    max(1.5rem, env(safe-area-inset-top))
    1rem
    max(1.5rem, env(safe-area-inset-bottom));
  overflow: hidden;
}

/* Wallpaper */
.bg {
  position: fixed;
  inset: -5%;
  z-index: -3;
  background-color: #120e18;
  background-image: var(--bg-image);
  background-size: cover;
  background-position: center;
  animation: bg-drift 48s ease-in-out infinite alternate;
  will-change: transform;
}

@keyframes bg-drift {
  from { transform: scale(1.04) translate3d(0, 0, 0); }
  to { transform: scale(1.09) translate3d(-1%, -0.6%, 0); }
}

.bg-fx {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  overflow: hidden;
}

.bg-fx::before {
  content: "";
  position: absolute;
  inset: -15%;
  background:
    radial-gradient(ellipse 48% 38% at 28% 28%, rgba(255, 120, 170, 0.14), transparent 58%),
    radial-gradient(ellipse 42% 34% at 78% 68%, rgba(110, 170, 255, 0.1), transparent 52%);
  animation: glow-shift 22s ease-in-out infinite alternate;
}

.bg-fx::after {
  content: "";
  position: absolute;
  top: -40%;
  left: -30%;
  width: 50%;
  height: 180%;
  background: linear-gradient(
    105deg,
    transparent 40%,
    rgba(255, 255, 255, 0.045) 50%,
    transparent 60%
  );
  transform: rotate(10deg);
  animation: sheen 16s ease-in-out infinite;
}

@keyframes glow-shift {
  from { transform: translate3d(0, 0, 0); opacity: 0.8; }
  to { transform: translate3d(3%, -2%, 0); opacity: 1; }
}

@keyframes sheen {
  0%, 100% { transform: translate3d(-10%, 0, 0) rotate(10deg); opacity: 0.25; }
  50% { transform: translate3d(70%, 0, 0) rotate(10deg); opacity: 0.55; }
}

.veil {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 68% 58% at 50% 48%, rgba(0, 0, 0, 0.18) 0%, rgba(0, 0, 0, 0.48) 100%),
    linear-gradient(180deg, rgba(6, 4, 12, 0.32) 0%, transparent 30%, transparent 70%, rgba(6, 4, 12, 0.4) 100%);
}

/* —— Card —— */
.card {
  position: relative;
  width: var(--card-w);
  padding: var(--card-pad-y) var(--card-pad-x) 1.4rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow);
  backdrop-filter: blur(32px) saturate(1.2);
  -webkit-backdrop-filter: blur(32px) saturate(1.2);
  text-align: center;
  animation: card-in 0.55s var(--ease) both;
}

.card::before {
  content: "";
  position: absolute;
  left: 14%;
  right: 14%;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.28), transparent);
  pointer-events: none;
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Status code */
.code {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-code);
  font-weight: 300;
  letter-spacing: var(--tracking-code);
  line-height: 1;
  color: #fff;
  font-variant-numeric: tabular-nums;
}

/* Accent rule */
.accent {
  width: 1.5rem;
  height: 2px;
  margin: 0.9rem auto 0;
  border-radius: 1px;
  background: var(--pink);
  opacity: 0.95;
}

/* Title */
.title {
  margin: 0.9rem 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-title);
  font-weight: 600;
  letter-spacing: var(--tracking-title);
  line-height: var(--lh-title);
  color: #fff;
  text-wrap: balance;
}

/* Body / lead */
.lead {
  margin: 0.45rem auto 0;
  max-width: 20rem;
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: var(--lh-body);
  color: var(--text-2);
  text-wrap: pretty;
}

/* Meta row */
.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
  margin-top: 1.15rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  max-width: 100%;
  min-height: 1.7rem;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-size: var(--fs-meta);
  line-height: 1.3;
  color: var(--text-2);
  background: var(--surface-soft);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: background 0.15s ease;
}

.chip:hover {
  background: rgba(255, 255, 255, 0.1);
}

.chip-label {
  color: var(--text-3);
  font-weight: 500;
  flex-shrink: 0;
}

.chip .mono {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 450;
  letter-spacing: -0.01em;
  color: rgba(255, 255, 255, 0.9);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 11.5rem;
}

/* Actions */
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  justify-content: center;
  margin-top: 1.2rem;
}

.btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  padding: 0.55rem 1.25rem;
  border-radius: 999px;
  font-family: var(--font);
  font-size: var(--fs-ui);
  font-weight: 600;
  letter-spacing: 0;
  line-height: 1;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    transform 0.15s var(--ease),
    box-shadow 0.15s ease;
}

.btn:focus-visible {
  outline: 2px solid rgba(255, 107, 157, 0.55);
  outline-offset: 2px;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  color: #fff;
  background: var(--pink);
  box-shadow: 0 8px 20px rgba(255, 107, 157, 0.28);
}

.btn-primary:hover {
  background: var(--pink-hover);
}

.btn-secondary {
  color: var(--text);
  background: var(--surface-soft);
  border: 1px solid var(--line-strong);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* Diagnostics */
.diag {
  margin-top: 1.05rem;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.26);
  border: 1px solid var(--line);
  text-align: left;
  overflow: hidden;
}

.diag > summary {
  list-style: none;
  cursor: pointer;
  user-select: none;
  padding: 0.7rem 0.9rem;
  font-size: var(--fs-meta);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text-2);
  line-height: 1.3;
}

.diag > summary::-webkit-details-marker {
  display: none;
}

.diag > summary::after {
  content: "展开";
  float: right;
  color: var(--text-3);
  font-weight: 500;
}

.diag[open] > summary::after {
  content: "收起";
}

.diag-body {
  padding: 0 0.9rem 0.9rem;
  border-top: 1px solid var(--line);
}

.token-slot,
.token-slot :is(h1, h2, h3, h4, p, div, span, li, td, th) {
  font-family: var(--font) !important;
  color: var(--text-2);
  font-size: var(--fs-ui) !important;
  line-height: var(--lh-body) !important;
}

.token-slot :is(h1, h2, h3, h4) {
  color: #fff !important;
  font-weight: 600 !important;
  font-size: var(--fs-body) !important;
  letter-spacing: var(--tracking-title);
  margin: 0.35rem 0;
  line-height: var(--lh-title) !important;
}

.token-slot a {
  color: #ffb6d0;
}

.token-slot code,
.token-slot pre {
  font-family: var(--mono) !important;
  font-size: var(--fs-meta) !important;
}

/* Challenge slot (shared base) */
.challenge-slot {
  margin-top: 1.15rem;
  padding: 1rem 0.85rem;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.22);
  border: 1px solid var(--line);
  display: block;
  width: 100%;
  min-height: 7rem;
  overflow: visible;
  text-align: center;
}

.challenge-slot iframe,
.challenge-slot > div {
  margin-left: auto !important;
  margin-right: auto !important;
  max-width: 100%;
}

.hint {
  margin: 0.7rem 0 0;
  font-size: var(--fs-tiny);
  line-height: 1.5;
  color: var(--text-3);
  letter-spacing: 0.01em;
}

.foot {
  margin: 1.05rem 0 0;
  font-size: var(--fs-tiny);
  line-height: 1.4;
  color: var(--text-3);
  letter-spacing: 0.02em;
}

.foot a {
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.15s ease;
}

.foot a:hover {
  color: #fff;
}

/* —— Challenge-safe overrides ——
   Keep type/spacing identical; only drop transforms/blur that break widgets. */
body.is-challenge .card {
  background: var(--surface-solid);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  animation: none;
  transform: none;
  overflow: visible;
}

body.is-challenge .chip {
  cursor: default;
}

body.is-challenge .chip:hover {
  background: var(--surface-soft);
}

body.is-challenge .meta {
  /* same border rhythm as error pages for visual unity */
  margin-top: 1rem;
  padding-top: 0.95rem;
}

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: max(1.1rem, env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(120%);
  z-index: 20;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  font-family: var(--font);
  font-size: var(--fs-meta);
  font-weight: 500;
  line-height: 1.3;
  color: #fff;
  background: rgba(16, 12, 22, 0.9);
  border: 1px solid var(--line-strong);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  transition: transform 0.3s var(--ease), opacity 0.25s ease;
  pointer-events: none;
}

.toast.is-show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Gallery index */
.gallery {
  width: min(100%, 52rem);
  z-index: 1;
}

.gallery-head {
  width: var(--card-w);
  margin: 0 auto 1.35rem;
}

.gallery-head .title,
.gallery-head .lead {
  max-width: none;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14.75rem, 1fr));
  gap: 0.65rem;
}

.tile {
  display: block;
  padding: 1rem 1.05rem;
  border-radius: 14px;
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.22);
  transition: transform 0.18s var(--ease), background 0.15s ease, border-color 0.15s ease;
}

.tile:hover {
  transform: translateY(-2px);
  background: rgba(22, 16, 30, 0.72);
  border-color: var(--line-strong);
}

.tile-code {
  display: block;
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 0.35rem;
  line-height: 1.3;
}

.tile-title {
  display: block;
  font-family: var(--font-display);
  font-size: var(--fs-ui);
  font-weight: 600;
  letter-spacing: var(--tracking-title);
  color: #fff;
  line-height: var(--lh-title);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tile-desc {
  display: block;
  margin-top: 0.25rem;
  font-size: var(--fs-meta);
  line-height: 1.45;
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (prefers-reduced-motion: reduce) {
  .bg,
  .bg-fx::before,
  .bg-fx::after,
  .card {
    animation: none !important;
  }

  .btn,
  .tile,
  .toast {
    transition: none !important;
  }
}

@media (max-width: 420px) {
  :root {
    --card-pad-x: 1.35rem;
    --card-pad-y: 1.55rem;
    --fs-title: 1.125rem;
  }

  .actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}