/*
 * currents.css — site chrome and game styling for The Currents Game.
 * Built on the gamekit design tokens (--gk-*) defined in gamekit.css. The
 * site is dark by design: the deep-water palette below overrides the gamekit
 * neutrals in BOTH color schemes, so the game always plays on a dark board
 * with the indigo current accent (#6875f7 family). Mobile-first; the board
 * fits a 390×844 viewport with no horizontal overflow.
 */

/* ----- deep-water reskin (dark in both schemes) ----- */

:root {
  color-scheme: dark;

  --gk-accent: #6875f7;
  --gk-accent-strong: #8a94ff;
  --gk-accent-contrast: #0b0f24;
  --gk-accent-soft: #23294f;

  --gk-bg: #0b0f24;
  --gk-surface: #131938;
  --gk-surface-2: #1a2147;
  --gk-ink: #e6e9fb;
  --gk-ink-soft: #a3abd6;
  --gk-line: #262e59;
  --gk-line-strong: #37406f;

  --gk-danger: #f0716c;
  --gk-warn: #f2b705;
  --gk-ok: #4cc38a;

  --gk-shadow-sm: 0 1px 2px rgba(3, 5, 18, 0.5);
  --gk-shadow: 0 1px 2px rgba(3, 5, 18, 0.4), 0 6px 20px rgba(3, 5, 18, 0.5);
  --gk-shadow-lg: 0 24px 60px rgba(2, 4, 14, 0.65);
}

@media (prefers-color-scheme: dark) {
  :root {
    --gk-accent: #6875f7;
    --gk-accent-strong: #8a94ff;
    --gk-accent-contrast: #0b0f24;
    --gk-accent-soft: #23294f;

    --gk-bg: #0b0f24;
    --gk-surface: #131938;
    --gk-surface-2: #1a2147;
    --gk-ink: #e6e9fb;
    --gk-ink-soft: #a3abd6;
    --gk-line: #262e59;
    --gk-line-strong: #37406f;
  }
}

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

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

body {
  margin: 0;
  font-family: var(--gk-font-sans);
  font-size: var(--gk-fs-md);
  line-height: 1.55;
  color: var(--gk-ink);
  background: var(--gk-bg);
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

h1,
h2,
h3 {
  font-family: var(--gk-font-display);
  line-height: 1.2;
  color: var(--gk-ink);
}

h1 {
  font-size: var(--gk-fs-2xl);
  margin: 0 0 var(--gk-space-3);
}

h2 {
  font-size: var(--gk-fs-xl);
  margin: var(--gk-space-6) 0 var(--gk-space-3);
}

a {
  color: var(--gk-accent-strong);
}

a:hover {
  color: var(--gk-ink);
}

main {
  flex: 1 0 auto;
  width: 100%;
}

.wrap {
  width: 100%;
  max-width: var(--gk-maxw);
  margin: 0 auto;
  padding-left: max(var(--gk-space-4), env(safe-area-inset-left));
  padding-right: max(var(--gk-space-4), env(safe-area-inset-right));
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--gk-accent);
  color: var(--gk-accent-contrast);
  padding: var(--gk-space-2) var(--gk-space-4);
  border-radius: var(--gk-radius-sm);
  z-index: 100;
}

.skip-link:focus {
  left: var(--gk-space-3);
  top: var(--gk-space-3);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--gk-space-2);
  min-height: var(--gk-tap);
  padding: 0 var(--gk-space-5);
  border-radius: var(--gk-radius-pill);
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--gk-transition), border-color var(--gk-transition), color var(--gk-transition);
}

.btn-primary {
  background: var(--gk-accent);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--gk-accent-strong);
  color: var(--gk-accent-contrast);
}

.btn-ghost {
  background: var(--gk-surface);
  border-color: var(--gk-line-strong);
  color: var(--gk-ink);
}

.btn-ghost:hover {
  background: var(--gk-surface-2);
  color: var(--gk-ink);
}

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

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

.site-header {
  background: var(--gk-surface);
  border-bottom: 1px solid var(--gk-line);
  position: sticky;
  top: 0;
  z-index: 40;
  padding-top: env(safe-area-inset-top);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--gk-space-3);
  min-height: 60px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--gk-space-2);
  text-decoration: none;
  color: var(--gk-ink);
  font-family: var(--gk-font-display);
  font-weight: 700;
  margin-right: auto;
}

.brand:hover {
  color: var(--gk-ink);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--gk-radius-sm);
  background: var(--gk-accent);
  color: #ffffff;
  font-weight: 800;
}

.brand-name {
  font-size: var(--gk-fs-lg);
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: var(--gk-tap);
  height: var(--gk-tap);
  padding: 0 10px;
  background: transparent;
  border: 1px solid var(--gk-line-strong);
  border-radius: var(--gk-radius-sm);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--gk-ink);
  border-radius: 2px;
}

.site-nav {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: var(--gk-space-1);
  padding-bottom: var(--gk-space-3);
}

.site-nav.open {
  display: flex;
}

.site-nav a {
  padding: var(--gk-space-3);
  border-radius: var(--gk-radius-sm);
  text-decoration: none;
  color: var(--gk-ink);
  font-weight: 600;
}

.site-nav a:hover {
  background: var(--gk-surface-2);
}

.site-nav a.active {
  color: var(--gk-accent-strong);
}

.header-account {
  margin-left: auto;
}

.header-account[hidden] {
  display: none;
}

@media (min-width: 820px) {
  .nav-toggle {
    display: none;
  }
  .site-nav {
    display: flex;
    flex-direction: row;
    width: auto;
    align-items: center;
    gap: var(--gk-space-1);
    padding-bottom: 0;
  }
  .header-account {
    margin-left: var(--gk-space-3);
  }
}

/* ----- sections ----- */

.hero {
  padding: var(--gk-space-7) 0 var(--gk-space-4);
  text-align: center;
}

.hero-sub {
  color: var(--gk-ink-soft);
  font-size: var(--gk-fs-lg);
  max-width: 62ch;
  margin: 0 auto;
}

.copy-section {
  padding: var(--gk-space-5) 0 var(--gk-space-6);
  max-width: 78ch;
}

.copy-section p {
  color: var(--gk-ink);
}

.cta-line {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gk-space-3);
  margin: var(--gk-space-4) 0;
}

.feature-list,
.howto-steps,
.rank-list,
.tip-list {
  padding-left: var(--gk-space-5);
}

.feature-list li,
.howto-steps li,
.rank-list li,
.tip-list li {
  margin: var(--gk-space-2) 0;
}

.disclaimer {
  background: var(--gk-surface-2);
  border-left: 3px solid var(--gk-accent);
  padding: var(--gk-space-3) var(--gk-space-4);
  border-radius: var(--gk-radius-sm);
  color: var(--gk-ink-soft);
  font-size: var(--gk-fs-sm);
}

/* ----- FAQ ----- */

.faq-item {
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius);
  padding: var(--gk-space-3) var(--gk-space-4);
  margin: var(--gk-space-3) 0;
  background: var(--gk-surface);
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  font-family: var(--gk-font-display);
}

.faq-answer {
  color: var(--gk-ink-soft);
  margin-top: var(--gk-space-2);
}

/* ----- comparison table ----- */

.compare-wrap {
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--gk-space-3) 0;
  min-width: 480px;
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--gk-line);
  padding: var(--gk-space-3);
  text-align: left;
  vertical-align: top;
}

.compare-table thead th {
  background: var(--gk-surface-2);
  font-family: var(--gk-font-display);
}

.compare-table th[scope="row"] {
  font-weight: 600;
}

/* ----- archive + library lists ----- */

.archive-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--gk-space-2);
}

.archive-list a {
  display: block;
  padding: var(--gk-space-3);
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius-sm);
  background: var(--gk-surface);
  text-decoration: none;
  text-align: center;
  color: var(--gk-ink);
}

.archive-list a:hover {
  border-color: var(--gk-accent);
  color: var(--gk-accent-strong);
}

.lib-grid {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(64px, 1fr));
  gap: var(--gk-space-2);
}

.lib-grid a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--gk-tap);
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius-sm);
  background: var(--gk-surface);
  text-decoration: none;
  color: var(--gk-ink);
  font-weight: 600;
}

.lib-grid a:hover {
  border-color: var(--gk-accent);
  color: var(--gk-accent-strong);
}

.archive-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gk-space-2);
  margin-top: var(--gk-space-4);
  align-items: center;
}

/* ----- play sections ----- */

.play-section {
  padding: var(--gk-space-5) 0 var(--gk-space-6);
}

.play-head {
  text-align: center;
  max-width: 64ch;
  margin: 0 auto var(--gk-space-4);
}

.play-intro {
  color: var(--gk-ink-soft);
}

.play-switch {
  text-align: center;
  margin-top: var(--gk-space-4);
}

/* ----- board shell ----- */

.currents {
  max-width: 560px;
  margin: 0 auto;
  background: var(--gk-surface);
  border: 1px solid var(--gk-line);
  border-radius: var(--gk-radius-lg);
  box-shadow: var(--gk-shadow);
  padding: var(--gk-space-4);
}

.cur-toolbar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--gk-space-3);
  margin-bottom: var(--gk-space-4);
}

.cur-stats {
  display: flex;
  gap: var(--gk-space-4);
  flex-wrap: wrap;
  justify-content: center;
}

.cur-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.cur-stat-label {
  font-size: var(--gk-fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gk-ink-soft);
}

.cur-stat-val {
  font-family: var(--gk-font-display);
  font-size: var(--gk-fs-lg);
  font-variant-numeric: tabular-nums;
}

.cur-boardwrap {
  background: var(--gk-surface-2);
  border-radius: var(--gk-radius);
  padding: var(--gk-space-3);
}

.cur-board {
  max-width: 480px;
  margin: 0 auto;
}

.cur-board svg {
  display: block;
  width: 100%;
  height: auto;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  border-radius: var(--gk-radius-sm);
}

.cur-board.shake {
  animation: cur-shake 0.4s ease;
}

/* ----- board pieces (SVG) ----- */

.cur-cell {
  fill: #10142e;
  stroke: var(--gk-line);
  stroke-width: 1.5;
  transition: fill var(--gk-transition);
}

.cur-cell.visited {
  fill: #2a3372;
}

.cur-cell.blocked {
  animation: cur-blocked 0.45s ease;
}

.cur-path {
  stroke: var(--gk-accent);
  stroke-width: 34;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.92;
  pointer-events: none;
}

.cur-path.astray {
  animation: cur-astray 0.7s ease;
}

.cur-startcap {
  fill: var(--gk-accent);
  pointer-events: none;
}

.cur-head {
  fill: #ffffff;
  stroke: var(--gk-accent);
  stroke-width: 6;
  pointer-events: none;
}

.cur-gate {
  fill: #0b0f24;
  stroke: var(--gk-line-strong);
  stroke-width: 4;
  pointer-events: none;
}

.cur-gate--start {
  stroke: var(--gk-warn);
}

.cur-gate--end {
  stroke: #ffffff;
}

.cur-gate.done {
  fill: var(--gk-accent);
  stroke: var(--gk-accent-strong);
}

.cur-gate.next {
  stroke: var(--gk-warn);
  animation: cur-gate-pulse 1.8s ease-in-out infinite;
}

.cur-gate.pulse {
  animation: cur-gate-pulse 0.9s ease-in-out 2;
}

.cur-gatenum {
  fill: #ffffff;
  font-family: var(--gk-font-display);
  font-size: 34px;
  font-weight: 700;
  pointer-events: none;
}

.cur-hintmark {
  fill: none;
  stroke: var(--gk-warn);
  stroke-width: 6;
  stroke-dasharray: 10 8;
  pointer-events: none;
  animation: cur-hint-spin 2.4s linear infinite;
  transform-box: fill-box;
  transform-origin: center;
}

/* ----- actions + message ----- */

.cur-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gk-space-2);
  justify-content: center;
  margin-top: var(--gk-space-4);
}

.cur-hint-btn.cooldown {
  opacity: 0.55;
  cursor: default;
}

.cur-message {
  text-align: center;
  min-height: 1.5em;
  margin: var(--gk-space-3) 0 0;
  color: var(--gk-ink-soft);
  font-size: var(--gk-fs-sm);
}

.cur-noscript {
  color: var(--gk-ink-soft);
  text-align: center;
}

/* ----- win overlay ----- */

.cur-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--gk-space-4);
  background: rgba(4, 6, 20, 0.66);
  z-index: 60;
}

.cur-overlay[hidden] {
  display: none;
}

.cur-overlay-card {
  background: var(--gk-surface);
  border-radius: var(--gk-radius-lg);
  box-shadow: var(--gk-shadow-lg);
  padding: var(--gk-space-6);
  max-width: 440px;
  width: 100%;
  text-align: center;
  max-height: calc(100dvh - 2 * var(--gk-space-4));
  overflow-y: auto;
}

.cur-overlay-close {
  position: sticky;
  top: calc(-1 * var(--gk-space-6));
  float: right;
  margin: calc(-1 * var(--gk-space-6)) calc(-1 * var(--gk-space-6)) 0 0;
  border: 0;
  background: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--gk-ink-soft);
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  z-index: 1;
}

/* Three staggered wave bars — the win cheer. */
.cur-cheer {
  display: flex;
  gap: var(--gk-space-2);
  justify-content: center;
  align-items: flex-end;
  height: 34px;
  margin-bottom: var(--gk-space-2);
}

.cur-cheer span {
  display: block;
  width: 12px;
  height: 22px;
  border-radius: var(--gk-radius-pill);
  background: var(--gk-accent);
  animation: cur-cheer-bob 1.1s ease-in-out infinite;
}

.cur-cheer span:nth-child(2) {
  animation-delay: 0.15s;
  background: var(--gk-warn);
}

.cur-cheer span:nth-child(3) {
  animation-delay: 0.3s;
  background: var(--gk-accent-strong);
}

.cur-overlay-sub {
  color: var(--gk-ink-soft);
}

.cur-overlay-stats {
  display: flex;
  justify-content: center;
  gap: var(--gk-space-5);
  margin: var(--gk-space-4) 0;
  flex-wrap: wrap;
}

.cur-overlay-stats div {
  display: flex;
  flex-direction: column;
}

.cur-overlay-stats dt {
  font-size: var(--gk-fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gk-ink-soft);
}

.cur-overlay-stats dd {
  margin: 0;
  font-family: var(--gk-font-display);
  font-size: var(--gk-fs-lg);
  font-variant-numeric: tabular-nums;
}

.cur-overlay-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gk-space-2);
  justify-content: center;
  margin-top: var(--gk-space-4);
}

.cur-share-status {
  color: var(--gk-ink-soft);
  font-size: var(--gk-fs-sm);
  min-height: 1.2em;
}

/* ----- leaderboard panel + page ----- */

.cur-lb-panel {
  margin-top: var(--gk-space-4);
  text-align: left;
}

.cur-lb-title {
  font-size: var(--gk-fs-lg);
  margin: 0 0 var(--gk-space-2);
}

.cur-lb-signin {
  color: var(--gk-ink-soft);
  font-size: var(--gk-fs-sm);
}

.lb-page {
  margin-top: var(--gk-space-4);
}

.lb-controls {
  margin-bottom: var(--gk-space-4);
}

.lb-date-label {
  display: inline-flex;
  flex-direction: column;
  gap: var(--gk-space-1);
  font-size: var(--gk-fs-sm);
  color: var(--gk-ink-soft);
}

.lb-date {
  min-height: var(--gk-tap);
  padding: 0 var(--gk-space-3);
  border: 1px solid var(--gk-line-strong);
  border-radius: var(--gk-radius-sm);
  background: var(--gk-surface);
  color: var(--gk-ink);
  font: inherit;
}

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

.site-footer {
  flex-shrink: 0;
  background: var(--gk-surface);
  border-top: 1px solid var(--gk-line);
  margin-top: var(--gk-space-7);
  padding: var(--gk-space-6) 0 calc(var(--gk-space-6) + env(safe-area-inset-bottom));
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--gk-space-5);
}

.footer-col h2 {
  font-size: var(--gk-fs-md);
  margin: 0 0 var(--gk-space-2);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin: var(--gk-space-1) 0;
}

.footer-col a {
  color: var(--gk-ink-soft);
  text-decoration: none;
}

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

.footer-note {
  margin-top: var(--gk-space-5);
  color: var(--gk-ink-soft);
  font-size: var(--gk-fs-sm);
}

.error-page {
  text-align: center;
}

/* ----- animations ----- */

@keyframes cur-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

@keyframes cur-blocked {
  0% { fill: var(--gk-danger); }
  100% { fill: #10142e; }
}

@keyframes cur-astray {
  0%, 100% { stroke: var(--gk-accent); }
  30%, 70% { stroke: var(--gk-danger); }
}

@keyframes cur-gate-pulse {
  0%, 100% { stroke-width: 4; }
  50% { stroke-width: 8; }
}

@keyframes cur-hint-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes cur-cheer-bob {
  0%, 100% { height: 14px; }
  50% { height: 30px; }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ----- fullscreen board layout (currents-specific) -----
 * The generic fullscreen shell lives in gamekit.css. .currents and
 * .cur-boardwrap carry data-gk-fs-fit; the board scales to the available
 * height so the whole grid stays visible. */
html.gk-fullscreen .currents { display: flex; flex-direction: column; flex: 1; min-height: 0; max-width: none; }
html.gk-fullscreen .cur-boardwrap { flex: 1; min-height: 0; display: flex; align-items: center; justify-content: center; }
html.gk-fullscreen .cur-board { width: 100%; max-width: min(92vw, calc((100dvh - 220px) * 0.875)); }
html.gk-fullscreen .play-section > *:not(.currents) { display: none; }
html.gk-fullscreen.gk-fs-tight .cur-toolbar { margin-bottom: var(--gk-space-2); }
html.gk-fullscreen.gk-fs-tight .cur-stat-val { font-size: var(--gk-fs-md); }
html.gk-fullscreen.gk-fs-tight .cur-boardwrap { padding: var(--gk-space-2); }
html.gk-fullscreen.gk-fs-tight .cur-actions .btn { min-height: 34px; padding: 4px 14px; font-size: var(--gk-fs-sm); }
html.gk-fullscreen.gk-fs-tight .currents { padding: var(--gk-space-3); }