/*
  FILE: css/styles.css
  PURPOSE: Visual layout and theme for the Sausage Dog game page.
  PARTS:
    - CSS variables (:root): palette inspired by dachshund fur and park grass
    - .game-shell: centered card layout
    - .hud: score and status messaging
    - #game-canvas: bordered playfield with subtle shadow
    - .controls-help: keyboard legend styling
    - .btn-restart: restart button states
  HOW TO TEST THIS FILE:
    1. Open index.html and verify warm brown/cream color scheme.
    2. Narrow viewport (<480px): card padding shrinks, canvas scales to 100% width.
    3. Tab to #restart-btn: focus ring visible (accessibility).
    4. Game over: #status text turns red (.status-line.game-over in JS adds class).
    5. Disable CSS temporarily: page should still work but look unstyled (confirms link works).
*/

:root {
  --bg-park: #7cb342;
  --bg-sky: #87ceeb;
  --card-cream: #fff8e7;
  --fur-brown: #8b4513;
  --fur-dark: #5d2e0c;
  --accent-orange: #e65100;
  --text-dark: #3e2723;
  --canvas-border: #5d4037;
  --shadow: rgba(62, 39, 35, 0.25);
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text-dark);
  background: linear-gradient(180deg, var(--bg-sky) 0%, var(--bg-park) 55%, #558b2f 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.game-shell {
  width: min(100%, 480px);
  background: var(--card-cream);
  border: 4px solid var(--fur-brown);
  border-radius: 20px;
  padding: 1.25rem 1.5rem 1.5rem;
  box-shadow: 0 12px 32px var(--shadow);
}

.game-header h1 {
  margin: 0 0 0.35rem;
  font-size: 1.65rem;
  color: var(--fur-dark);
  text-align: center;
}

.tagline {
  margin: 0;
  text-align: center;
  font-size: 0.95rem;
  opacity: 0.85;
}

.hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 1rem 0 0.75rem;
  font-weight: 600;
}

.score-line span {
  color: var(--accent-orange);
  font-size: 1.2rem;
}

.status-line {
  margin: 0;
  font-size: 0.9rem;
}

.status-line.game-over {
  color: #c62828;
  font-weight: 700;
}

#game-canvas {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
  background: #a5d6a7;
  border: 4px solid var(--canvas-border);
  border-radius: 8px;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.controls-help {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(139, 69, 19, 0.08);
  border-radius: 12px;
  border: 2px dashed var(--fur-brown);
}

.controls-help h2 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.controls-help ul {
  margin: 0;
  padding-left: 1.2rem;
  font-size: 0.9rem;
  line-height: 1.5;
}

kbd {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  border: 1px solid var(--fur-brown);
  border-radius: 4px;
  background: #fff;
  font-size: 0.85em;
  font-family: inherit;
}

.game-footer {
  margin-top: 1rem;
  text-align: center;
}

.btn-restart {
  cursor: pointer;
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1.4rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(180deg, var(--accent-orange), #bf360c);
  box-shadow: 0 4px 0 var(--fur-dark);
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.btn-restart:hover {
  transform: translateY(-1px);
}

.btn-restart:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 var(--fur-dark);
}

.btn-restart:focus-visible {
  outline: 3px solid var(--bg-sky);
  outline-offset: 3px;
}