/* Mob-Lab - 個人開発スタジオ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #f8f8f8;
  --fg: #0f0f0f;
  --muted: #5c5c5c;
  --border: #e5e5e5;
  --surface: #ffffff;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.06);
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", Meiryo, sans-serif;
  background: linear-gradient(180deg, var(--bg) 0%, #f0f0f0 100%);
  color: var(--fg);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  max-width: 560px;
  margin: 0 auto;
  padding: 5rem 1.5rem 6rem;
  width: 100%;
}

header {
  padding: 0 0 2.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--fg);
  display: inline-block;
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
}

.logo:hover {
  opacity: 0.6;
  transform: translateX(2px);
}

.logo:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 4px;
}

section {
  margin-bottom: 0.5rem;
}

section:last-of-type {
  margin-bottom: 0;
}

h2 {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

ul {
  list-style: none;
}

li {
  margin-bottom: 0.5rem;
}

li:last-child {
  margin-bottom: 0;
}

.item-link {
  display: block;
  padding: 1rem 1.25rem;
  background: var(--surface);
  color: var(--fg);
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: all 0.3s var(--ease);
}

.item-link:hover {
  border-color: var(--fg);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.item-link:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

.item-link[href="#"] {
  cursor: default;
  opacity: 0.85;
}

.item-link[href="#"]:hover {
  transform: none;
  border-color: var(--border);
  box-shadow: var(--shadow);
}

.item-link span {
  color: var(--muted);
  font-size: 0.875rem;
}

.item-link:hover span {
  color: var(--muted);
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

footer {
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  letter-spacing: 0.05em;
}