/* =========================================================
   Battleships Online — shared styles
   Theme: clean ocean/navy, responsive, AA contrast
   ========================================================= */

:root {
  --navy-900: #0b1f33;
  --navy-800: #10293f;
  --navy-700: #17334d;
  --blue-600: #1e6fb8;
  --blue-500: #2b86d9;
  --blue-100: #dbeefc;
  --sand-100: #f4f7fa;
  --white: #ffffff;
  --ink: #1c2733;
  --ink-soft: #4a5a68;
  --hit: #d64545;
  --sunk: #8c2f39;
  --miss: #9fb3c4;
  --ship: #5b7186;
  --radius: 10px;
  --shadow: 0 2px 10px rgba(11, 31, 51, 0.12);
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--sand-100);
  line-height: 1.6;
}

img { max-width: 100%; height: auto; }

/* Accessibility helpers */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--white);
  color: var(--blue-600);
  padding: 0.75rem 1rem;
  z-index: 200;
}
.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

:focus-visible {
  outline: 3px solid var(--blue-500);
  outline-offset: 2px;
}

/* ---------- Header / navigation ---------- */

.site-header {
  background: var(--navy-900);
  color: var(--white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 0.6rem;
  padding-bottom: 0.6rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--white);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.15rem;
}
.brand svg { width: 28px; height: 28px; }

.main-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
}

.main-nav a {
  display: block;
  color: var(--blue-100);
  text-decoration: none;
  padding: 0.5rem 0.85rem;
  border-radius: 6px;
  font-size: 0.97rem;
}
.main-nav a:hover { background: var(--navy-700); color: var(--white); }
.main-nav a[aria-current="page"] {
  background: var(--blue-600);
  color: var(--white);
}

.nav-toggle {
  display: none;
  background: transparent;
  color: var(--white);
  border: 2px solid var(--navy-700);
  border-radius: 6px;
  padding: 0.4rem 0.7rem;
  font-size: 1rem;
  cursor: pointer;
}

@media (max-width: 780px) {
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    width: 100%;
  }
  .main-nav.open { display: block; }
  .main-nav ul {
    flex-direction: column;
    padding-bottom: 0.75rem;
  }
}

/* ---------- Layout ---------- */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

main { padding: 2rem 0 3rem; }

.page-title {
  color: var(--navy-900);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1.2;
  margin: 0 0 0.5rem;
}

.page-subtitle {
  color: var(--ink-soft);
  font-size: 1.1rem;
  margin: 0 0 2rem;
  max-width: 46rem;
}

.section-title {
  color: var(--navy-800);
  font-size: 1.4rem;
  margin: 2.5rem 0 0.75rem;
}

.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}
.card-grid .card { margin-bottom: 0; }

.hero {
  background: linear-gradient(160deg, var(--navy-900), var(--navy-700));
  color: var(--white);
  text-align: center;
  padding: 3.5rem 0;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 0.75rem;
  line-height: 1.15;
}
.hero p {
  font-size: clamp(1.05rem, 2.5vw, 1.3rem);
  color: var(--blue-100);
  max-width: 40rem;
  margin: 0 auto 1.75rem;
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--blue-600);
  color: var(--white);
  text-decoration: none;
  border: none;
  border-radius: var(--radius);
  padding: 0.8rem 1.6rem;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}
.btn:hover { background: var(--blue-500); }
.btn-secondary {
  background: transparent;
  border: 2px solid var(--blue-600);
  color: var(--blue-600);
}
.btn-secondary:hover { background: var(--blue-100); }

/* Tables (fleet info etc.) */
.table-wrap { overflow-x: auto; }
table {
  border-collapse: collapse;
  width: 100%;
  background: var(--white);
}
th, td {
  text-align: left;
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid #e3eaf0;
}
th {
  background: var(--navy-800);
  color: var(--white);
}
tbody tr:nth-child(even) { background: #f6fafd; }

/* Legal / long-form pages */
.legal h2 {
  color: var(--navy-800);
  font-size: 1.25rem;
  margin: 2rem 0 0.5rem;
}
.legal p, .legal li { max-width: 46rem; }
.legal ul { padding-left: 1.4rem; }
.last-updated {
  color: var(--ink-soft);
  font-style: italic;
  margin-bottom: 1.5rem;
}

/* Contact form */
.contact-form label {
  display: block;
  font-weight: 600;
  margin: 1rem 0 0.3rem;
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  max-width: 30rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid #c3d0da;
  border-radius: 6px;
  font: inherit;
}
.contact-form textarea { min-height: 140px; resize: vertical; }

.form-hint { color: var(--ink-soft); font-size: 0.92rem; }

/* ---------- Game page ---------- */

.game-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
@media (min-width: 980px) {
  .game-layout { grid-template-columns: 2fr 1fr; align-items: start; }
}

.boards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.board-panel h2 {
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
  color: var(--navy-800);
  text-align: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(11, 1fr);
  gap: 2px;
  background: var(--navy-800);
  padding: 4px;
  border-radius: var(--radius);
}

.cell {
  aspect-ratio: 1 / 1;
  border: none;
  padding: 0;
  background: var(--blue-100);
  border-radius: 3px;
  cursor: pointer;
  min-width: 0;
  transition: background 0.1s ease;
  position: relative;
  outline-offset: -2px;
}
.cell:focus-visible {
  outline: 3px solid var(--white);
  box-shadow: 0 0 0 3px var(--blue-500);
  z-index: 2;
}

.grid .label {
  background: transparent;
  color: var(--blue-100);
  font-size: clamp(0.55rem, 1.4vw, 0.75rem);
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

.enemy-board:not(.locked) .cell:not([disabled]):hover {
  background: var(--blue-500);
}

.cell.ship { background: var(--ship); }
.cell.hit {
  background: var(--hit);
  position: relative;
}
.cell.miss { background: var(--miss); }
.cell.sunk { background: var(--sunk); }

.cell::after {
  content: "";
  position: absolute;
  inset: 25%;
  border-radius: 50%;
}
.cell.miss::after { background: var(--white); opacity: 0.85; }
.cell.hit::after, .cell.sunk::after {
  content: "✕";
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: clamp(0.6rem, 1.6vw, 0.9rem);
  border-radius: 0;
}

.enemy-board.locked .cell { cursor: default; }
.enemy-board.locked { opacity: 0.75; }

.game-status {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.25rem;
}

#status-message {
  font-size: 1.15rem;
  font-weight: 600;
  min-height: 1.6em;
  margin: 0 0 0.75rem;
}

.fleet-status {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.fleet-status li {
  font-size: 0.82rem;
  background: var(--blue-100);
  color: var(--navy-800);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}
.fleet-status li.sunk {
  background: var(--sunk);
  color: var(--white);
  text-decoration: line-through;
}

.log {
  max-height: 180px;
  overflow-y: auto;
  font-size: 0.88rem;
  color: var(--ink-soft);
  border-top: 1px solid #e3eaf0;
  padding-top: 0.5rem;
}
.log p { margin: 0.15rem 0; }

.game-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1rem; }

.game-over-banner {
  background: var(--navy-900);
  color: var(--white);
  border-radius: var(--radius);
  text-align: center;
  padding: 2rem 1rem;
  margin-bottom: 1.5rem;
}
.game-over-banner.win { background: #14663f; }
.game-over-banner.lose { background: var(--sunk); }
.game-over-banner p { font-size: 1.2rem; margin: 0 0 1rem; }

[hidden] { display: none !important; }

/* Ad placeholders — remove this block when real ad code is added */
.ad-slot { margin: 1.5rem 0; text-align: center; }

/* ---------- Footer ---------- */

.site-footer {
  background: var(--navy-900);
  color: var(--blue-100);
  padding: 2rem 0;
  margin-top: 3rem;
  font-size: 0.92rem;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  margin: 0;
  padding: 0;
}
.footer-links a { color: var(--blue-100); text-decoration: none; }
.footer-links a:hover { color: var(--white); text-decoration: underline; }

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