:root {
  /* ---- Dark theme (default) ---- */
  --bg: #121212;
  --fg: #e0e0e0;
  --border: #333;
  --logo: #e0e0e0;
  --toggle-border: #666;
  --toggle-border-hover: #aaa;
  --hero-btn: #ddd;
  --quote-p: #bbb;
  --quote-span: #888;
  --card: #ddd;
  --card-border: #444;
  --toc-li: #222;
  --code: #222;
  --link: #3b82f6;
}

.light-mode {
  /* ---- Light theme (override) ---- */
  --bg: #ffffff;
  --fg: #222222;
  --border: #dddddd;
  --logo: #333333;
  --toggle-border: #999;
  --toggle-border-hover: #666;
  --hero-btn: #222;
  --quote-p: #555;
  --quote-span: #666;
  --card: #333;
  --card-border: #d5d5d5;
  --toc-li: #eee;
  --code: #f2f2f2;
  --link: #3b82f6;
}



/* ========== Reset & base ========== */
*,
*::before,
*::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "Noto Sans JP", "Roboto", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  background: var(--bg);
  color: var(--fg);
}

a { text-decoration: none; color: inherit; }
.stackedit__right a {text-decoration: underline; color: var(--link); }
.stackedit__right a:hover {text-decoration: none; }

blockquote {
  color: var(--quote-p);
  border-left: 4px solid var(--border);
}

code, pre { background: var(--code) !important; }



/* ========== ナビゲーションバー ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 auto;
  padding: 0.8rem 1.5rem;
}

.logo {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.8rem;
  color: var(--logo);
  transition: color .3s ease, transform .3s ease;
}

.nav-icons { display: flex; align-items: center; gap: 1rem; }

.icon {
  width: 24px; height: 24px;
  vertical-align: text-bottom;
  transition: transform .3s ease, opacity .3s ease;
}
.icon:hover { transform: scale(1.15); opacity: .8; }

@media (max-width: 400px) {
  .nav-icons a { font-size: .85rem; }
  .logo { font-size: 1.5rem; }
  .nav-icons { gap: .6rem; }
  .icon { width: 20px; height: 20px; }
}



/* ========== Layout padding ========== */
body { padding-top: 60px; }



/* ========== TOC ========== */
.stackedit__left  { padding-top: 80px; border-right: 1px solid var(--border); }
.stackedit__right { padding-top: 60px; }
.stackedit__toc ul li:hover { background: var(--toc-li) !important; }

h1::before,
h2::before,
h3::before,
h4::before,
h5::before,
h6::before {
  content: "";
  display: block;
  height: 90px;
  margin-top: -90px;
  visibility: hidden;
}



/* ========== テーマトグル ========== */
.dark-toggle {
  width: 46px; height: 26px;
  border-radius: 13px;
  border: 1px solid var(--toggle-border);
  background: var(--fg);
  cursor: pointer;
  position: relative;
  transition: background .3s ease, border-color .3s ease;
}
.dark-toggle::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #000;
  transition: transform .3s ease, background .3s ease;
}
.dark-toggle:hover { border-color: var(--toggle-border-hover); }

.light-mode .dark-toggle::after {
  transform: translateX(20px);
  background: #fff;
}



/* ========== home page ========== */
body.homepage { padding-top: 0; overflow-x: hidden; }

.hero {
  padding-top: 10vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 80vh;
  text-align: center;
  background: var(--bg);
}

.hero-logo {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(5rem, 10vw, 10rem);
  font-weight: 700;
  margin: 0;
  letter-spacing: -.02em;
}

.hero-tagline { font-size: clamp(1.1rem, 2vw, 1.6rem); margin: 1.2rem 0 2rem; }

.hero-cta { display: flex; gap: 1.2rem; flex-wrap: wrap; justify-content: center; }

.btn {
  color: var(--hero-btn);
  padding: .9rem 2.2rem;
  border-radius: 20px;
  border: 1px solid var(--hero-btn);
  font-size: 1rem;
  transition: all .3s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 12px 20px rgba(255,255,255,.1); }
.light-mode .btn:hover { transform: translateY(-2px); box-shadow: 0 12px 20px rgba(0,0,0,.1); }

.quote {
  padding: 2rem 1rem;
  font-family: "Space Grotesk", sans-serif;
  font-style: italic;
  font-size: .95rem;
  text-align: center;
  color: var(--quote-p);
}
.quote span { font-size: .9rem; color: var(--quote-span); }
.quote blockquote { border-left: none !important; padding-left: 0 !important; margin: 0; }



/* ========== Article Page ========== */
.card {
  display: flex;
  align-items: center;
  padding: 1rem 1.25rem;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  color: var(--card);
  background: var(--bg);
  font-weight: 600;
  -webkit-tap-highlight-color: transparent;
  transition: background .25s ease, border-color .25s ease, box-shadow .25s ease, transform .15s ease;
}
.card::after {
  content: '';
  width: .65rem; height: .65rem;
  margin-left: auto;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg) translateX(0);
  opacity: .6;
  transition: transform .2s ease, opacity .2s ease;
}
.card:hover { opacity: 1; transform: translateX(2vw); }
.card:hover::after { transform: rotate(-45deg); opacity: 1; }
.card:focus { outline: none; }
.card:focus-visible { box-shadow: 0 0 0 3px rgba(13,111,253,.6); }

.light-mode .card:hover { box-shadow: 0 4px 12px rgba(0,0,0,.15); }

.card-title { margin: 0; font-size: 1rem; line-height: 1.4; }

.status-bar {
  position: fixed; bottom: 0; left: 0; right: 0;
  height: 28px; padding: 0 12px;
  font-family: "Space Grotesk", "Noto Sans JP", monospace;
  font-size: .85rem; line-height: 28px;
  background: var(--bg);
  color: var(--fg);
  border-top: 1px solid var(--border);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  text-align: center; z-index: 900;
}

body { padding-bottom: 28px; }

.card h3 { font-size: 1rem; font-weight: 500; }



/* ========== font util ========== */
.font-title { font-family: "Space Grotesk", sans-serif; }



/* ========== Code block with copy button ========== */
.code-container {
  position: relative;
  margin: 1.2em 0;
}

.copy-button {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--fg);
  color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.75rem;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 500;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.3s ease, background-color 0.2s ease, transform 0.1s ease;
  z-index: 10;
  user-select: none;
  -webkit-user-select: none;
}
.copy-button:hover {
  opacity: 1;
  transform: scale(1.05);
}
.copy-button:active {
  transform: scale(0.95);
}
.copy-button.copied {
  background: #22c55e;
  color: white;
  border-color: #22c55e;
}
.copy-button:focus {
  outline: none;
}
.copy-button:focus-visible {
  box-shadow: 0 0 0 2px var(--link);
}
.copy-button:focus:not(:focus-visible) {
  box-shadow: none;
}

.code-container pre {
  margin: 0;
  position: relative;
  padding-right: 70px;
}

@media (max-width: 768px) {
  .copy-button {
    top: 4px;
    right: 4px;
    padding: 3px 6px;
    font-size: 0.7rem;
  }
  
  .code-container pre {
    padding-right: 60px;
  }
}

.code-container code, 
.code-container pre { 
  background: var(--code) !important; 
}

.light-mode .copy-button {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}
.light-mode .copy-button:hover,
.light-mode .copy-button:focus-visible {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}