:root {
  color-scheme: light;
  --studio-mist: #eef4f1;
  --paper-white: #f8faf8;
  --console-ink: #19352e;
  --signal-teal: #2d7f75;
  --cue-amber: #c9a66a;
  --live-coral: #d86a52;
  --muted-ink: #62776f;
  --fine-line: rgba(25, 53, 46, 0.18);
  --strong-line: rgba(25, 53, 46, 0.42);
  --page-width: 1240px;
  --display-face: "Arial Narrow", "Roboto Condensed", "Microsoft YaHei", sans-serif;
  --body-face: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --signal-face: ui-monospace, "Cascadia Mono", "SFMono-Regular", Consolas,
    monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  color: var(--console-ink);
  background: var(--studio-mist);
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  margin: 0;
  color: var(--console-ink);
  background:
    linear-gradient(90deg, transparent 0 72%, rgba(45, 127, 117, 0.035) 72%),
    var(--studio-mist);
  font-family: var(--body-face);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  content: "";
  pointer-events: none;
  background:
    linear-gradient(var(--fine-line) 1px, transparent 1px) 0 0 / 100% 96px,
    radial-gradient(circle at 80% 14%, rgba(45, 127, 117, 0.1), transparent 26%);
  mask-image: linear-gradient(to bottom, black, transparent 72%);
}

[hidden] {
  display: none !important;
}

a {
  color: inherit;
}

:where(a, button):focus-visible {
  outline: 3px solid var(--cue-amber);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 9px 14px;
  border-radius: 999px;
  color: var(--paper-white);
  background: var(--console-ink);
  font-weight: 750;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--fine-line);
  background: rgba(238, 244, 241, 0.92);
  backdrop-filter: blur(16px);
}

.site-header-inner,
.page-shell,
.site-footer {
  width: min(var(--page-width), calc(100% - 64px));
  margin-inline: auto;
}

.site-header-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 74px;
}

.brand {
  display: inline-flex;
  gap: 11px;
  align-items: center;
  justify-self: start;
  text-decoration: none;
}

.brand-mark {
  display: flex;
  gap: 3px;
  align-items: end;
  justify-content: center;
  width: 31px;
  height: 31px;
  padding: 7px;
  border: 1px solid var(--strong-line);
  border-radius: 50%;
}

.brand-mark i {
  display: block;
  width: 2px;
  border-radius: 2px;
  background: var(--signal-teal);
}

.brand-mark i:nth-child(1) {
  height: 7px;
}

.brand-mark i:nth-child(2) {
  height: 14px;
}

.brand-mark i:nth-child(3) {
  height: 10px;
}

.brand-name {
  font-family: var(--signal-face);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.24em;
}

.header-context {
  margin: 0;
  color: var(--muted-ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.quiet-link {
  display: inline-flex;
  gap: 9px;
  align-items: center;
  justify-self: end;
  color: var(--muted-ink);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition:
    color 180ms ease,
    transform 180ms var(--ease-out);
}

.quiet-link:hover {
  color: var(--signal-teal);
  transform: translateX(2px);
}

.page-shell {
  padding: 0 0 96px;
}

.catalog-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(440px, 0.95fr);
  gap: clamp(48px, 8vw, 120px);
  align-items: center;
  min-height: 620px;
  padding: 80px 0 88px;
}

.eyebrow {
  margin: 0 0 17px;
  color: var(--signal-teal);
  font-family: var(--signal-face);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.18em;
  line-height: 1.4;
}

.catalog-hero h1,
.detail-title-block h1 {
  max-width: 820px;
  margin: 0;
  font-family: var(--display-face);
  font-size: clamp(55px, 7vw, 102px);
  font-stretch: condensed;
  font-weight: 800;
  letter-spacing: -0.065em;
  line-height: 0.93;
}

.hero-summary,
.detail-summary {
  max-width: 590px;
  margin: 32px 0 0;
  color: var(--muted-ink);
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.8;
}

.signal-panel {
  align-self: end;
  margin-bottom: 16px;
  border: 1px solid var(--strong-line);
  background: rgba(248, 250, 248, 0.72);
  box-shadow: 18px 18px 0 rgba(45, 127, 117, 0.08);
}

.signal-heading {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  min-height: 49px;
  padding: 0 18px;
  border-bottom: 1px solid var(--fine-line);
  font-family: var(--signal-face);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.signal-code {
  color: var(--muted-ink);
}

.live-dot,
.loading-signal,
.empty-signal {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--live-coral);
  box-shadow: 0 0 0 0 rgba(216, 106, 82, 0.34);
  animation: signal-pulse 2.4s ease-out infinite;
}

.live-dot {
  box-shadow: none;
  animation: none;
}

.signal-rail {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 0;
  padding: 30px 22px 28px;
  list-style: none;
}

.signal-rail::before {
  position: absolute;
  top: 45px;
  right: 17%;
  left: 17%;
  height: 1px;
  content: "";
  background: linear-gradient(90deg, var(--signal-teal), var(--cue-amber));
}

.signal-rail li {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
  text-align: center;
}

.signal-index {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  margin-bottom: 12px;
  border: 1px solid var(--signal-teal);
  border-radius: 50%;
  color: var(--signal-teal);
  background: var(--paper-white);
  font-family: var(--signal-face);
  font-size: 9px;
  font-weight: 800;
}

.signal-rail strong {
  font-family: var(--display-face);
  font-size: 16px;
  letter-spacing: -0.015em;
}

.signal-rail small {
  margin-top: 3px;
  color: var(--muted-ink);
  font-size: 11px;
}

.catalog-section {
  border-top: 2px solid var(--console-ink);
}

.section-heading {
  display: flex;
  gap: 30px;
  align-items: end;
  justify-content: space-between;
  padding: 29px 0 26px;
  border-bottom: 1px solid var(--fine-line);
}

.section-heading .eyebrow,
.steps-heading .eyebrow {
  margin-bottom: 4px;
}

.section-heading h2,
.steps-heading h2 {
  margin: 0;
  font-family: var(--display-face);
  font-size: clamp(31px, 4vw, 48px);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1;
}

.catalog-count {
  margin: 0 0 3px;
  color: var(--muted-ink);
  font-family: var(--signal-face);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.empty-state,
.detail-message {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 22px;
  align-items: start;
  min-height: 180px;
  padding: 43px 0;
  border-bottom: 1px solid var(--fine-line);
}

.empty-signal {
  width: 12px;
  height: 12px;
  margin-top: 8px;
  background: var(--cue-amber);
  animation: none;
}

.empty-state.is-error .empty-signal,
.detail-message.is-error .loading-signal {
  background: var(--live-coral);
  animation: none;
}

.empty-title,
.detail-message p {
  margin: 0;
  font-family: var(--display-face);
  font-size: clamp(23px, 3vw, 34px);
  font-weight: 750;
  letter-spacing: -0.035em;
  line-height: 1.25;
}

.empty-hint {
  margin: 10px 0 0;
  color: var(--muted-ink);
  font-size: 13px;
}

.channel-list {
  border-bottom: 1px solid var(--console-ink);
}

.game-channel {
  display: grid;
  grid-template-columns:
    minmax(280px, 1.7fr) repeat(3, minmax(110px, 0.7fr))
    auto;
  gap: clamp(18px, 3vw, 42px);
  align-items: center;
  min-height: 144px;
  padding: 25px 0;
  border-top: 1px solid var(--fine-line);
  transition:
    padding 220ms var(--ease-out),
    background 180ms ease;
}

.game-channel:first-child {
  border-top: 0;
}

.game-channel:hover {
  padding-right: 16px;
  padding-left: 16px;
  background: rgba(248, 250, 248, 0.62);
}

.channel-heading-row {
  display: flex;
  gap: 14px;
  align-items: center;
}

.channel-heading-row h3 {
  margin: 0;
  font-family: var(--display-face);
  font-size: clamp(23px, 2.5vw, 34px);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.channel-identity p {
  max-width: 480px;
  margin: 9px 0 0;
  color: var(--muted-ink);
  font-size: 13px;
  line-height: 1.55;
}

.status-badge {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  min-height: 22px;
  padding: 2px 8px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-family: var(--signal-face);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.status-available {
  color: var(--signal-teal);
}

.status-preview {
  color: #8b5e27;
}

.channel-signal {
  min-width: 0;
}

.channel-label {
  display: block;
  margin-bottom: 5px;
  color: var(--muted-ink);
  font-family: var(--signal-face);
  font-size: 9px;
  font-weight: 750;
  letter-spacing: 0.12em;
}

.channel-signal strong {
  display: block;
  overflow: hidden;
  font-family: var(--display-face);
  font-size: 14px;
  font-weight: 750;
  line-height: 1.35;
  text-overflow: ellipsis;
}

.channel-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 43px;
  padding: 8px 16px;
  border: 1px solid var(--console-ink);
  color: var(--paper-white);
  background: var(--console-ink);
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
  transition:
    color 180ms ease,
    background 180ms ease,
    transform 180ms var(--ease-out);
}

.channel-link:hover {
  color: var(--console-ink);
  background: var(--cue-amber);
  transform: translateY(-2px);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 27px 0 38px;
  border-top: 1px solid var(--fine-line);
  color: var(--muted-ink);
  font-family: var(--signal-face);
  font-size: 9px;
  letter-spacing: 0.12em;
}

/* Shared game detail shell */
.detail-shell {
  min-height: calc(100dvh - 75px);
  padding-top: 70px;
}

.detail-message {
  min-height: 240px;
  border-top: 2px solid var(--console-ink);
}

.loading-signal {
  margin-top: 10px;
}

.detail-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(390px, 0.9fr);
  gap: clamp(54px, 8vw, 120px);
  align-items: end;
  min-height: 500px;
  padding: 35px 0 70px;
  border-top: 2px solid var(--console-ink);
  border-bottom: 1px solid var(--fine-line);
}

.detail-meta {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 25px;
}

.detail-meta .eyebrow {
  margin: 0;
}

.detail-title-block h1 {
  font-size: clamp(58px, 8vw, 116px);
}

.detail-signal-rail {
  position: relative;
  display: grid;
  gap: 0;
  margin: 0;
  border: 1px solid var(--strong-line);
  background: rgba(248, 250, 248, 0.72);
  box-shadow: 16px 16px 0 rgba(45, 127, 117, 0.08);
}

.detail-signal-rail > div {
  display: grid;
  grid-template-columns: 115px 1fr;
  gap: 18px;
  align-items: baseline;
  min-height: 88px;
  padding: 20px;
  border-top: 1px solid var(--fine-line);
}

.detail-signal-rail > div:first-child {
  border-top: 0;
}

.detail-signal-rail dt,
.detail-signal-rail dd {
  margin: 0;
}

.detail-signal-rail dt {
  color: var(--muted-ink);
  font-family: var(--signal-face);
  font-size: 9px;
  font-weight: 750;
  letter-spacing: 0.07em;
}

.detail-signal-rail dt span {
  display: inline-block;
  width: 32px;
  color: var(--signal-teal);
}

.detail-signal-rail dd {
  font-family: var(--display-face);
  font-size: 20px;
  font-weight: 750;
  letter-spacing: -0.025em;
  line-height: 1.35;
}

.steps-section {
  display: grid;
  grid-template-columns: minmax(220px, 0.65fr) minmax(0, 1.35fr);
  gap: clamp(52px, 8vw, 120px);
  padding: 70px 0 24px;
}

.game-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: game-step;
}

.game-steps li {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 20px;
  align-items: baseline;
  min-height: 83px;
  padding: 18px 0;
  border-top: 1px solid var(--fine-line);
  color: var(--console-ink);
  font-size: clamp(17px, 1.8vw, 22px);
  line-height: 1.5;
  counter-increment: game-step;
}

.game-steps li::before {
  color: var(--signal-teal);
  content: counter(game-step, decimal-leading-zero);
  font-family: var(--signal-face);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.game-steps li:last-child {
  border-bottom: 1px solid var(--fine-line);
}

@keyframes signal-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(216, 106, 82, 0.35);
  }
  55%,
  100% {
    box-shadow: 0 0 0 9px rgba(216, 106, 82, 0);
  }
}

@media (max-width: 1020px) {
  .catalog-hero {
    grid-template-columns: 1fr;
    gap: 58px;
    min-height: 0;
  }

  .hero-copy {
    max-width: 760px;
  }

  .signal-panel {
    width: min(100%, 620px);
    margin-bottom: 0;
  }

  .game-channel {
    grid-template-columns: minmax(260px, 1.4fr) repeat(3, minmax(100px, 0.6fr));
  }

  .channel-link {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .detail-hero {
    grid-template-columns: 1fr;
    gap: 58px;
  }

  .detail-signal-rail {
    width: min(100%, 620px);
  }
}

@media (max-width: 720px) {
  .site-header-inner,
  .page-shell,
  .site-footer {
    width: min(100% - 36px, var(--page-width));
  }

  .site-header-inner {
    grid-template-columns: 1fr auto;
  }

  .header-context {
    display: none;
  }

  .catalog-hero {
    gap: 44px;
    padding: 62px 0 68px;
  }

  .catalog-hero h1,
  .detail-title-block h1 {
    font-size: clamp(48px, 15vw, 76px);
  }

  .hero-summary,
  .detail-summary {
    margin-top: 25px;
  }

  .game-channel {
    grid-template-columns: repeat(3, 1fr);
    gap: 22px 14px;
    padding: 28px 0;
  }

  .channel-identity,
  .channel-link {
    grid-column: 1 / -1;
  }

  .channel-link {
    justify-self: stretch;
  }

  .game-channel:hover {
    padding-right: 0;
    padding-left: 0;
  }

  .detail-shell {
    padding-top: 54px;
  }

  .detail-hero {
    min-height: 0;
    padding-bottom: 56px;
  }

  .steps-section {
    grid-template-columns: 1fr;
    gap: 34px;
    padding-top: 56px;
  }
}

@media (max-width: 480px) {
  .brand-name {
    letter-spacing: 0.18em;
  }

  .quiet-link {
    font-size: 12px;
  }

  .signal-heading {
    grid-template-columns: auto 1fr;
  }

  .signal-code {
    display: none;
  }

  .signal-rail {
    grid-template-columns: 1fr;
    gap: 22px;
    padding: 26px 22px;
  }

  .signal-rail::before {
    top: 42px;
    right: auto;
    bottom: 42px;
    left: 37px;
    width: 1px;
    height: auto;
    background: linear-gradient(var(--signal-teal), var(--cue-amber));
  }

  .signal-rail li {
    display: grid;
    grid-template-columns: 32px 1fr;
    gap: 0 14px;
    align-items: center;
    text-align: left;
  }

  .signal-index {
    grid-row: 1 / 3;
    margin: 0;
  }

  .signal-rail small {
    grid-column: 2;
  }

  .section-heading {
    display: block;
  }

  .catalog-count {
    margin-top: 15px;
  }

  .game-channel {
    grid-template-columns: 1fr;
  }

  .channel-identity,
  .channel-link {
    grid-column: auto;
  }

  .channel-signal {
    display: grid;
    grid-template-columns: 58px 1fr;
    align-items: baseline;
  }

  .channel-label {
    margin: 0;
  }

  .detail-signal-rail > div {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .site-footer {
    display: grid;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* The detail shell stays visually neutral; each immutable v2 stylesheet owns
   its reference-faithful game canvas. */
body.game-page {
  min-width: 320px;
  min-height: 100dvh;
  margin: 0;
  overflow-x: hidden;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", system-ui,
    sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

body.game-page::before {
  display: none;
}

.game-page :where(button, a) {
  letter-spacing: 0;
}

.game-page :where(button, a):focus-visible {
  outline: 3px solid #ffd84d;
  outline-offset: 3px;
}

.game-shell-meta {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.game-main {
  width: 100%;
  min-height: 100dvh;
  margin: 0;
  padding: 0;
}

#game-root {
  min-width: 0;
}

.storage-warning,
.game-noscript {
  position: fixed;
  z-index: 40;
  top: max(10px, env(safe-area-inset-top));
  left: 50%;
  width: min(420px, calc(100% - 24px));
  margin: 0;
  padding: 10px 14px;
  border: 1px solid #f3bc3f;
  border-radius: 6px;
  color: #412600;
  background: #fff4c7;
  box-shadow: 0 8px 28px rgb(0 0 0 / 0.2);
  font-size: 13px;
  font-weight: 800;
  text-align: center;
  transform: translateX(-50%);
}

.game-loading {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 100dvh;
  padding: 32px;
  color: #173c75;
  background: #ddf1ff;
}

.game-loading p {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
}

.game-loading.is-error {
  color: #6d1d24;
  background: #fff0f2;
}

.game-disclaimer {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.game-dialog {
  width: min(620px, calc(100% - 24px));
  max-height: min(84dvh, 760px);
  padding: 0;
  overflow: auto;
  border: 1px solid #1764be;
  border-radius: 8px;
  color: #102a54;
  background: #f8fcff;
  box-shadow: 0 24px 80px rgb(0 0 0 / 0.38);
}

.game-dialog::backdrop {
  background: rgb(8 24 65 / 0.76);
  backdrop-filter: blur(3px);
}

.game-dialog > header {
  padding: 20px 22px 16px;
  border-bottom: 1px solid rgb(23 100 190 / 0.22);
}

.game-dialog > header p {
  margin: 0 0 4px;
  color: #4370a8;
  font-size: 11px;
  font-weight: 800;
}

.game-dialog > header h2 {
  margin: 0;
  font-size: 23px;
  line-height: 1.25;
}

.dialog-content,
.dialog-message {
  margin: 0;
  padding: 20px 22px;
}

.game-dialog form {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  padding: 14px 22px 20px;
  border-top: 1px solid rgb(23 100 190 / 0.22);
}

.game-dialog button {
  min-width: 44px;
  min-height: 44px;
  padding: 9px 18px;
  border: 1px solid #1764be;
  border-radius: 6px;
  color: #102a54;
  background: #fff;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.game-dialog .dialog-confirm {
  color: #fff;
  background: #e84871;
}

.rules-summary,
.rules-note {
  margin: 0;
}

.rules-note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgb(23 100 190 / 0.22);
  font-weight: 700;
}

.rules-list {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding-left: 22px;
}

@media (max-width: 430px) {
  .game-dialog > header,
  .dialog-content,
  .dialog-message {
    padding-right: 18px;
    padding-left: 18px;
  }

  .game-dialog form {
    padding-right: 18px;
    padding-left: 18px;
  }
}