/* =========================================================
   Seagulls — design system
   Plain CSS, no framework. Coastal palette, light + dark.
   ========================================================= */

:root {
  color-scheme: light dark;

  /* Palette (light) */
  --bg: #f4f8fb;
  --bg-elevated: #ffffff;
  --text: #16232e;
  --muted: #566573;
  --accent: #0d7dc4;      /* sea blue */
  --accent-strong: #075a8f;
  --accent-warm: #e9a13b; /* beak / sand */
  --border: #d8e2ec;
  --shadow: 0 10px 30px rgba(16, 42, 67, 0.10);

  /* Mode accents */
  --land: #7a9a4b;
  --sea: #1c7bb0;
  --air: #6ba8d6;

  /* Type + layout */
  --font-sans: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  --font-display: "Georgia", "Times New Roman", serif;
  --maxw: 1080px;
  --radius: 16px;
  --radius-sm: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1720;
    --bg-elevated: #12212d;
    --text: #e6eef5;
    --muted: #9db0c0;
    --accent: #3ea6e6;
    --accent-strong: #7cc6f2;
    --accent-warm: #f2b757;
    --border: #21323f;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
    --land: #9cbf68;
    --sea: #45a3d8;
    --air: #8fc2e8;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

h1, h2, h3 { line-height: 1.2; font-weight: 700; }
h1 { font-family: var(--font-display); font-size: clamp(2rem, 5vw, 3.4rem); margin: 0 0 .5rem; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); margin: 0 0 .75rem; }
h3 { font-size: 1.2rem; margin: 0 0 .35rem; }
p { margin: 0 0 1rem; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.muted { color: var(--muted); }
.center { text-align: center; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(160%) blur(10px);
  background: color-mix(in srgb, var(--bg-elevated) 82%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 62px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand svg { width: 30px; height: 30px; }
.nav-links { display: flex; gap: .25rem; align-items: center; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: inline-block;
  padding: .45rem .7rem;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  font-size: .95rem;
}
.nav-links a:hover { color: var(--text); background: color-mix(in srgb, var(--accent) 12%, transparent); text-decoration: none; }
.nav-links a.active { color: var(--accent-strong); background: color-mix(in srgb, var(--accent) 16%, transparent); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .4rem .55rem;
  color: var(--text);
  cursor: pointer;
  font-size: 1.1rem;
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }
  .nav-links {
    position: absolute;
    top: 62px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: .5rem 1rem 1rem;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .7rem .6rem; border-radius: var(--radius-sm); }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1200px 400px at 70% -10%, color-mix(in srgb, var(--air) 40%, transparent), transparent),
    linear-gradient(180deg, color-mix(in srgb, var(--sea) 22%, var(--bg)) 0%, var(--bg) 70%);
  border-bottom: 1px solid var(--border);
}
.hero-inner { padding: clamp(3rem, 8vw, 6rem) 0 clamp(2.5rem, 6vw, 4rem); }
.hero .eyebrow {
  text-transform: uppercase;
  letter-spacing: .18em;
  font-size: .78rem;
  font-weight: 700;
  color: var(--accent-strong);
  margin-bottom: .75rem;
}
.hero h1 { max-width: 16ch; }
.hero .lead { font-size: clamp(1.05rem, 2.2vw, 1.35rem); max-width: 60ch; color: var(--muted); }

.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .7rem 1.15rem;
  border-radius: 999px;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 1rem;
  transition: transform .08s ease, box-shadow .2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--accent-strong); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-strong); }

/* ---------- Sections ---------- */
section { padding: clamp(2.5rem, 6vw, 4.5rem) 0; }
.section-head { max-width: 62ch; margin-bottom: 2rem; }
.section-head .kicker {
  text-transform: uppercase; letter-spacing: .16em; font-size: .75rem;
  font-weight: 700; color: var(--accent); margin-bottom: .5rem;
}

/* ---------- Cards / grids ---------- */
.grid { display: grid; gap: 1.25rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 860px) { .grid-3 { grid-template-columns: 1fr; } .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.card .icon { font-size: 2rem; line-height: 1; margin-bottom: .6rem; display: block; }

/* Mode cards get a colored top edge */
.mode-card { border-top: 4px solid var(--accent); }
.mode-card.land { border-top-color: var(--land); }
.mode-card.sea  { border-top-color: var(--sea); }
.mode-card.air  { border-top-color: var(--air); }
.mode-tag {
  display: inline-block; font-size: .72rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .1em; padding: .2rem .55rem; border-radius: 999px; margin-bottom: .6rem;
  background: color-mix(in srgb, var(--accent) 15%, transparent); color: var(--accent-strong);
}
.mode-card.land .mode-tag { background: color-mix(in srgb, var(--land) 20%, transparent); color: var(--land); }
.mode-card.sea  .mode-tag { background: color-mix(in srgb, var(--sea) 18%, transparent); color: var(--sea); }
.mode-card.air  .mode-tag { background: color-mix(in srgb, var(--air) 22%, transparent); color: var(--air); }

/* Stat band */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat { text-align: center; padding: 1rem; }
.stat .num { font-family: var(--font-display); font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; color: var(--accent); }
.stat .label { font-size: .9rem; color: var(--muted); }

/* Comparison table */
.compare { width: 100%; border-collapse: collapse; }
.compare th, .compare td { padding: .8rem 1rem; text-align: left; border-bottom: 1px solid var(--border); }
.compare thead th { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.compare tbody tr:last-child td { border-bottom: none; }
.compare .yes { color: var(--land); font-weight: 700; }
.compare .no { color: var(--muted); }
.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-elevated); }

/* Feature / anatomy list */
.feature-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 1rem; }
.feature-list li { display: flex; gap: .85rem; align-items: flex-start; }
.feature-list .bullet {
  flex: 0 0 auto; width: 2.2rem; height: 2.2rem; border-radius: 50%;
  display: grid; place-items: center; font-size: 1.15rem;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
}

.callout {
  border-left: 4px solid var(--accent-warm);
  background: color-mix(in srgb, var(--accent-warm) 10%, var(--bg-elevated));
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
}

.tag-row { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.pill {
  font-size: .8rem; font-weight: 600; padding: .3rem .7rem; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent-strong);
}

.split { display: grid; grid-template-columns: 1.1fr .9fr; gap: 2rem; align-items: center; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } }

.band { background: var(--bg-elevated); border-block: 1px solid var(--border); }

/* ---------- Game ---------- */
.game-shell { max-width: 860px; margin-inline: auto; }
.game-frame {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: linear-gradient(180deg, #bfe3f5 0%, #d9f0f7 55%, #f3e4bf 55%, #efd89f 100%);
}
@media (prefers-color-scheme: dark) {
  .game-frame { background: linear-gradient(180deg, #24425a 0%, #2b5169 55%, #4a4330 55%, #5a5238 100%); }
}
#game-canvas { display: block; width: 100%; height: auto; touch-action: none; }
.game-hud {
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center;
  margin-bottom: 1rem;
}
.game-hud .score-box { font-weight: 700; }
.game-hud .score-box .num { color: var(--accent); font-size: 1.3rem; }
.game-overlay {
  position: absolute; inset: 0; display: grid; place-items: center; text-align: center;
  background: color-mix(in srgb, #06131d 55%, transparent); color: #fff; padding: 1.5rem;
}
.game-overlay.hidden { display: none; }
.game-overlay h3 { color: #fff; font-size: 1.6rem; }
.game-overlay p { color: #e6eef5; max-width: 34ch; margin-inline: auto; }
.controls-hint { font-size: .85rem; color: var(--muted); margin-top: .75rem; text-align: center; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 2.5rem 0;
  margin-top: 2rem;
}
.footer-grid { display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: space-between; align-items: flex-start; }
.footer-grid .brand { margin-bottom: .5rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem; list-style: none; padding: 0; margin: 0; }
.footer-links a { color: var(--muted); font-weight: 600; }
.footer-note { font-size: .85rem; color: var(--muted); margin-top: 1rem; }

/* ---------- Utilities ---------- */
.mt-0 { margin-top: 0; } .mb-0 { margin-bottom: 0; }
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #fff; padding: .6rem 1rem; border-radius: 0 0 var(--radius-sm) 0; z-index: 100;
}
.skip-link:focus { left: 0; }

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