common.css

:root {
  --ink: #1a1a2e;
  --muted: #596174;
  --paper: #fffefc;
  --paper-soft: #f7f4ef;
  --accent: #c44536;
  --accent-soft: rgba(196, 69, 54, 0.09);
  --line: rgba(26, 26, 46, 0.12);
  --nav-bg: rgba(255, 254, 252, 0.88);
  --shadow: 0 18px 50px rgba(36, 28, 48, 0.10);
  --container: 1080px;
}

[data-theme="dark"] {
  --ink: #f0edf4;
  --muted: #b5afbf;
  --paper: #171622;
  --paper-soft: #211f2c;
  --accent: #ec8676;
  --accent-soft: rgba(236, 134, 118, 0.10);
  --line: rgba(255, 255, 255, 0.13);
  --nav-bg: rgba(23, 22, 34, 0.88);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(760px 360px at 14% 0%, var(--accent-soft), transparent 68%),
    var(--paper);
  font-family: "Work Sans", system-ui, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 1000;
  padding: 9px 14px;
  border-radius: 6px;
  color: var(--paper);
  background: var(--ink);
  transform: translateY(-150%);
  transition: transform 0.18s ease;
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  border-bottom: 1px solid var(--line);
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.nav-inner {
  width: min(var(--container), calc(100% - 48px));
  min-height: 70px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.logo {
  color: var(--ink);
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.18rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.logo:hover { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 22px; }

.nav-links a {
  position: relative;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active { color: var(--accent); }

.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -8px;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  transform: translateX(-50%);
}

.theme-toggle,
.menu-toggle {
  border: 1px solid var(--line);
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}

.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  font-size: 1rem;
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: rotate(-10deg);
}

.theme-toggle:active { transform: rotate(0) scale(0.96); }
.menu-toggle { display: none; width: 42px; height: 38px; border-radius: 8px; padding: 9px; }
.menu-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--ink); transition: transform 0.2s ease, opacity 0.2s ease; }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.menu-toggle:active { transform: scale(0.96); }

footer {
  padding: 34px 24px 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
  font-size: 0.78rem;
}

@media (max-width: 860px) {
  .nav-inner { width: min(100% - 36px, var(--container)); }
  .menu-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 22px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    box-shadow: var(--shadow);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 4px; font-size: 1rem; }
  .nav-links a.active::after { left: 4px; bottom: 7px; transform: none; }
  .theme-toggle { margin-top: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.001ms !important; animation-duration: 0.001ms !important; }
}