/* ==========================================================
   base.css
   全ページ共通のベーススタイル（レイアウト・ヘッダー・ナビ・
   モバイルメニュー・フッター・背景キャンバス）
   色はCSS変数化してあるので、テーマ違い（例: works.css）は
   :root の変数を上書きするだけで対応できます。
   ========================================================== */

:root {
  --bg: #ffffff;
  --fg: #000000;
  --muted: rgba(0, 0, 0, 0.4);
  --menu-bg: rgba(255, 255, 255, 0.98);
}

* {
  box-sizing: border-box;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Courier New', monospace;
  margin: 0;
  overflow-x: hidden;
}

#canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  opacity: 0.65;
}

header {
  position: relative;
  z-index: 10;
  padding: 20px 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

h1 {
  color: var(--fg);
  margin: 0;
  font-size: 2.1em;
  letter-spacing: 2px;
}

.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 32px;
  color: var(--fg);
  cursor: pointer;
  z-index: 100;
  padding: 10px;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 32px;
  align-items: center;
}

nav ul li a {
  color: var(--fg);
  text-decoration: none;
  font-size: 1.2rem;
  padding: 8px 0;
  letter-spacing: 0.4px;
  transition: opacity 0.2s ease;
}

nav ul li a:hover {
  opacity: 0.75;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--menu-bg);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 40px;
  z-index: 99;
  font-size: 1.8em;
  color: var(--fg);
}

.mobile-menu.active {
  display: flex;
}

.mobile-menu a {
  color: var(--fg);
  text-decoration: none;
  transition: opacity 0.25s ease;
}

.mobile-menu a:hover {
  opacity: 0.75;
}

.menu-close {
  position: absolute;
  top: 20px;
  right: 5%;
  background: none;
  border: none;
  font-size: 32px;
  line-height: 1;
  color: var(--fg);
  cursor: pointer;
  padding: 10px;
  z-index: 101;
  transition: opacity 0.25s ease;
}

.menu-close:hover {
  opacity: 0.75;
}

footer {
  text-align: center;
  padding: 40px 0;
  color: var(--muted);
  font-size: 0.9em;
  position: relative;
  z-index: 2;
}

@media (max-width: 768px) {
  .hamburger { display: block; }
  nav ul { display: none; }
}