/* 1s.xyz home styles */

/* ---- Theme variables ---- */
:root {
  --bg: #ffffff; --fg: #1a1a2e; --accent: #0f3460;
  --accent-light: #edf2f8; --muted: #64748b;
  --border: #e2e8f0; --card-bg: #f8fafc;
  --shadow: rgba(0,0,0,0.06);
}
@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    --bg: #0f172a; --fg: #e2e8f0; --accent: #60a5fa;
    --accent-light: #1e293b; --muted: #94a3b8;
    --border: #334155; --card-bg: #1e293b;
    --shadow: rgba(0,0,0,0.2);
  }
}
html[data-theme="dark"] {
  --bg: #0f172a; --fg: #e2e8f0; --accent: #60a5fa;
  --accent-light: #1e293b; --muted: #94a3b8;
  --border: #334155; --card-bg: #1e293b;
  --shadow: rgba(0,0,0,0.2);
}

/* ---- Base ---- */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif;
  background: var(--bg); color: var(--fg); line-height: 1.7;
}
.container { max-width: 920px; margin: 0 auto; padding: 0 1.5rem; }

/* ---- Header ---- */
.site-header {
  display: flex; align-items: center;
  padding: 1rem 1.5rem; max-width: 920px; margin: 0 auto;
}
.site-logo {
  font-weight: 800; font-size: 1.15rem; color: var(--accent);
  text-decoration: none; letter-spacing: -0.03em;
}
.site-nav { display: flex; gap: 1.5rem; margin-left: 2rem; }
.site-nav a {
  color: var(--muted); text-decoration: none;
  font-size: 0.85rem; font-weight: 500;
}
.site-nav a:hover { color: var(--accent); }
.header-spacer { flex: 1; }
.theme-toggle {
  background: none; border: 1px solid var(--border);
  color: var(--fg); padding: 0.3rem 0.6rem; border-radius: 4px;
  cursor: pointer; font-size: 0.8rem;
}
.theme-toggle::after { content: "🌙"; }
html[data-theme="dark"] .theme-toggle::after { content: "☀️"; }
.theme-toggle:hover { background: var(--card-bg); }

/* ---- Hero ---- */
.hero {
  text-align: center; padding: 5rem 1.5rem 4rem;
  max-width: 680px; margin: 0 auto;
}
.hero h1 {
  font-size: 2.2rem; font-weight: 800;
  letter-spacing: -0.02em; margin-bottom: 1rem;
}
.hero p {
  font-size: 1rem; color: var(--muted);
  line-height: 1.8; margin-bottom: 2rem;
}
.hero-cta { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  display: inline-block; padding: 0.7rem 1.5rem;
  background: var(--accent); color: #fff; border-radius: 6px;
  text-decoration: none; font-size: 0.9rem; font-weight: 600;
  transition: opacity 0.15s;
}
.btn-primary:hover { opacity: 0.85; }
.btn-secondary {
  display: inline-block; padding: 0.7rem 1.5rem;
  background: transparent; color: var(--accent);
  border: 1px solid var(--border); border-radius: 6px;
  text-decoration: none; font-size: 0.9rem;
  transition: border-color 0.15s;
}
.btn-secondary:hover { border-color: var(--accent); }

/* ---- Sections ---- */
section { padding: 3rem 0; }
section h2 {
  font-size: 1.25rem; margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}
.section-label {
  font-size: 0.7rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--accent); display: block; margin-bottom: 0.8rem;
}

/* ---- Featured ---- */
.featured-card {
  background: var(--accent-light); border: 1px solid var(--border);
  border-radius: 12px; padding: 2rem;
}
.featured-card h2 { font-size: 1.35rem; margin-bottom: 0.6rem; }
.featured-card p {
  color: var(--muted); margin-bottom: 1.5rem; line-height: 1.7;
  font-size: 0.95rem;
}

/* ---- Card grid ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}
.card {
  display: block; background: var(--card-bg);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 1.5rem; text-decoration: none; color: var(--fg);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px var(--shadow);
}
.card h3 {
  font-size: 1rem; margin-bottom: 0.4rem; color: var(--accent);
}
.card p {
  font-size: 0.82rem; color: var(--muted); line-height: 1.6;
}
.card .card-link {
  display: inline-block; margin-top: 0.7rem;
  font-size: 0.82rem; color: var(--accent); text-decoration: none;
}
.card .card-link:hover { text-decoration: underline; }

/* ---- About ---- */
.about p {
  color: var(--muted); max-width: 600px; line-height: 1.8;
  font-size: 0.95rem;
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0; margin-top: 2rem;
}
.footer-links { display: flex; gap: 1.5rem; margin-bottom: 0.8rem; }
.footer-links a {
  color: var(--muted); text-decoration: none; font-size: 0.82rem;
}
.footer-links a:hover { color: var(--accent); }
.footer-copy { font-size: 0.75rem; color: var(--muted); opacity: 0.6; }

/* ---- Mobile ---- */
@media (max-width: 640px) {
  .hero { padding: 3rem 1.5rem 2.5rem; }
  .hero h1 { font-size: 1.7rem; }
  .site-nav { gap: 1rem; margin-left: 1rem; }
  .site-nav a { font-size: 0.8rem; }
  .card-grid { grid-template-columns: 1fr; }
}
@media (max-width: 420px) {
  .site-nav { display: none; }
}