@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap");

:root {
  --bg: #f4f7f4;
  --bg-soft: #eff5f0;
  --panel: #ffffff;
  --ink: #132119;
  --muted: #4e5f53;
  --line: #ced7cf;
  --line-strong: #afbcaf;
  --accent: #145a32;
  --accent-soft: #e5f3ea;
  --warn: #b05b16;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.35rem;
  --space-6: 1.85rem;

  --content-max: 1060px;
  --measure-max: 68ch;

  --shadow-1: 0 8px 24px rgba(19, 33, 25, 0.06);
  --shadow-2: 0 18px 44px rgba(19, 33, 25, 0.12);
}

:root[data-theme="dark"] {
  --bg: #0f1613;
  --bg-soft: #15201a;
  --panel: #17211c;
  --ink: #e6f0ea;
  --muted: #aec1b5;
  --line: #2a3a32;
  --line-strong: #3a5146;
  --accent: #60bf88;
  --accent-soft: #183325;
  --warn: #f0b067;

  --shadow-1: 0 10px 28px rgba(0, 0, 0, 0.28);
  --shadow-2: 0 18px 48px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 85% -10%, color-mix(in srgb, var(--accent) 18%, transparent) 0%, transparent 35%),
    radial-gradient(circle at 5% 20%, color-mix(in srgb, var(--warn) 12%, transparent) 0%, transparent 35%),
    var(--bg);
}

html.auth-pending main.page {
  visibility: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
}

.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-right: var(--space-4);
}

.brand small {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 500;
  letter-spacing: 0.03em;
}

.brand.active {
  color: var(--accent);
}

.brand.active small {
  color: color-mix(in srgb, var(--accent) 72%, var(--muted));
}

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) var(--space-6);
}

.page-flow > * {
  width: min(100%, var(--content-max));
  margin-inline: auto;
}

.page-flow > * + * {
  margin-top: var(--space-5);
}

.page-flow > .section-head + section {
  margin-top: var(--space-3);
}

.icon-btn {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 84%, var(--bg-soft));
  border-radius: 10px;
  padding: 0.38rem 0.58rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.79rem;
  color: var(--ink);
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease;
}

.icon-btn:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
}

.mobile-only {
  display: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin-right: auto;
}

.nav-link {
  padding: 0.48rem 0.72rem;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 600;
  transition: all 140ms ease;
}

.nav-link:hover {
  color: var(--ink);
  border-color: var(--line);
  background: color-mix(in srgb, var(--panel) 92%, var(--bg-soft));
}

.nav-link.active {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
  background: var(--accent-soft);
  font-weight: 700;
}

.utility-tools {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.utility-btn {
  font-size: 0.82rem;
  padding: 0.34rem 0.52rem;
  opacity: 0.72;
}

.utility-btn:hover {
  opacity: 1;
}

.mobile-nav {
  max-width: 1180px;
  margin: 0 auto;
  max-height: 0;
  overflow: hidden;
  transition: max-height 180ms ease;
}

.mobile-nav-panel {
  margin: 0 var(--space-4) var(--space-4);
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  display: grid;
  gap: var(--space-1);
}

.topbar.mobile-open .mobile-nav {
  max-height: 360px;
}

.hero,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

.hero {
  padding: clamp(1.1rem, 2.5vw, 2rem);
}

.hero h1,
.hero h2,
.hero h3 {
  margin: 0;
  line-height: 1.1;
}

.hero > h1 {
  margin-top: var(--space-2) !important;
  font-size: clamp(1.42rem, 3.3vw, 2.5rem);
}

.hero p,
.panel p,
p {
  color: var(--muted);
  line-height: 1.62;
  max-width: var(--measure-max);
}

.label {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
  border-radius: 999px;
  padding: 0.18rem 0.52rem;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.btn {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.56rem 0.82rem;
  background: color-mix(in srgb, var(--panel) 86%, var(--bg-soft));
  font-weight: 600;
}

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

.grid {
  display: grid;
  gap: var(--space-4);
}

.grid.two {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid.three {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.split {
  display: grid;
  grid-template-columns: 1.1fr 1.2fr 0.9fr;
  gap: var(--space-4);
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
  padding: 0.95rem;
  box-shadow: 0 1px 0 color-mix(in srgb, var(--bg-soft) 80%, transparent);
}

.card h3,
.card h4 {
  margin: 0 0 0.45rem;
}

.card p + p {
  margin-top: var(--space-2);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.chip {
  border-radius: 999px;
  border: 1px solid var(--line);
  padding: 0.18rem 0.5rem;
  font-size: 0.77rem;
  color: var(--muted);
}

.section-title {
  margin: 0;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin: 0;
}

.mono {
  font-family: "IBM Plex Mono", monospace;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.table th,
.table td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  padding: 0.55rem 0.45rem;
}

.table th {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.tabs {
  display: flex;
  gap: 0.42rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
}

.tab-btn.active {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.tab-panel[hidden] {
  display: none;
}

.replay-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.board {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(8, minmax(20px, 1fr));
  gap: 4px;
  margin-top: 0.35rem;
}

.cell {
  aspect-ratio: 1/1;
  border-radius: 6px;
  border: 1px solid color-mix(in srgb, var(--line) 88%, transparent);
  background: color-mix(in srgb, var(--bg-soft) 78%, var(--panel));
}

.cell.snake {
  background: #2f8a4f;
  border-color: #2f8a4f;
}

.cell.food {
  background: #c6651a;
  border-color: #c6651a;
}

.cell.risk-low {
  background: #f0f6e7;
}

.cell.risk-mid {
  background: #ffe9c8;
}

.cell.risk-high {
  background: #ffd6d3;
}

:root[data-theme="dark"] .cell.risk-low {
  background: #254029;
}

:root[data-theme="dark"] .cell.risk-mid {
  background: #5a4723;
}

:root[data-theme="dark"] .cell.risk-high {
  background: #603432;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.45rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.14rem 0.45rem;
  font-size: 0.74rem;
  color: var(--muted);
}

.swatch {
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 3px;
  border: 1px solid color-mix(in srgb, var(--line) 80%, transparent);
}

.timeline {
  margin-top: 0.5rem;
}

.timeline input[type="range"] {
  width: 100%;
}

.status-strip {
  position: sticky;
  bottom: 0.4rem;
  border: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--accent) 74%, #122219);
  color: #f5fff8;
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-size: 0.82rem;
  display: inline-flex;
  gap: 0.55rem;
  margin-top: 0.7rem;
}

.palette {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
}

.palette.open {
  display: block;
}

.palette-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 23, 20, 0.44);
}

.palette-panel {
  position: relative;
  width: min(92vw, 460px);
  margin: 11vh auto 0;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
  padding: 0.75rem;
  display: grid;
  gap: 0.35rem;
}

.palette-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.2rem 0.25rem 0.4rem;
}

.palette-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.48rem 0.58rem;
  background: color-mix(in srgb, var(--panel) 92%, var(--bg-soft));
}

.palette-item:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
  background: color-mix(in srgb, var(--accent-soft) 75%, var(--panel));
}

.reveal {
  opacity: 0;
  transform: translateY(7px);
  transition: opacity 240ms ease, transform 240ms ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }

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

@media (max-width: 980px) {
  .split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .desktop-nav {
    display: none;
  }

  .mobile-only {
    display: inline-flex;
  }

  .topbar-inner {
    gap: var(--space-2);
  }

  .utility-tools {
    gap: 0.35rem;
  }

  .page {
    padding: 0.95rem 0.75rem 1.3rem;
  }

  .hero {
    padding: 0.95rem;
  }

  .card {
    padding: 0.8rem;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .brand small {
    font-size: 0.66rem;
  }
}



.panel {
  padding: var(--space-4);
}

.split-equal {
  grid-template-columns: 1fr 1fr 1fr;
}

.split-lab {
  grid-template-columns: 0.95fr 1.35fr 0.9fr;
}

.soft-block {
  background: color-mix(in srgb, var(--panel) 88%, var(--bg-soft));
}

.min-h-220 {
  min-height: 220px;
}

.mt-3 {
  margin-top: var(--space-3);
}

.subnav-row {
  margin-top: var(--space-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 84%, transparent);
  background: color-mix(in srgb, var(--panel) 86%, var(--bg-soft));
}

.subnav {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.35rem var(--space-4);
  display: flex;
  align-items: center;
  gap: 0.2rem;
  flex-wrap: wrap;
}

.subnav-link {
  padding: 0.5rem 0.75rem;
  border-radius: 0;
  border: 0;
  border-bottom: 1px solid transparent;
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 400;
  opacity: 0.82;
}

.subnav-link:hover {
  border-bottom-color: color-mix(in srgb, var(--line) 70%, transparent);
  color: var(--ink);
  opacity: 1;
}

.subnav-link.active {
  color: var(--ink);
  border-bottom-color: color-mix(in srgb, var(--line-strong) 92%, transparent);
  background: transparent;
  font-weight: 500;
  opacity: 1;
}

.user-menu {
  position: relative;
}

.user-menu summary {
  list-style: none;
}

.user-menu summary::-webkit-details-marker {
  display: none;
}

.user-menu-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 0.35rem);
  min-width: 170px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
  padding: 0.35rem;
  box-shadow: var(--shadow-2);
  display: grid;
  gap: 0.15rem;
  z-index: 40;
}

.user-menu-panel a {
  padding: 0.38rem 0.5rem;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.84rem;
}

.user-menu-panel a:hover {
  background: color-mix(in srgb, var(--panel) 85%, var(--bg-soft));
  color: var(--ink);
}