/* ==========================================================================
   Global design tokens
   ========================================================================== */

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

:root {
  --accent: #196eff;

  --bg: #ffffff;
  --surface: #fafafa;
  --surface-2: #f2f5fb;
  --ink: #111111;
  --ink-2: #3f4652;
  --ink-3: #7b8492;
  --rule: #dedede;
  --rule-strong: #111111;
  --row-hover: #f7f9ff;
  --blue-soft: #eef4ff;
  --blue-line: #c4d8ff;

  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Newsreader", Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;

  --frame-width: 820px;
  --radius-sm: 8px;
  --radius-pill: 999px;
}

:root[data-theme="dark"] {
  --bg: #0d0d0d;
  --surface: #151515;
  --surface-2: #1d212a;
  --ink: #f4f7fb;
  --ink-2: #c1c9d6;
  --ink-3: #8791a1;
  --rule: #2d2d2d;
  --rule-strong: #595f6b;
  --row-hover: #111827;
  --blue-soft: rgba(25, 110, 255, 0.14);
  --blue-line: rgba(25, 110, 255, 0.45);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration-color: rgba(25, 110, 255, 0.45);
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--accent);
}

button {
  font: inherit;
}

svg {
  display: block;
}

::selection {
  background: var(--accent);
  color: #ffffff;
}

/* ==========================================================================
   Shared utilities
   ========================================================================== */

.site-frame {
  width: min(100%, var(--frame-width));
  min-height: 100vh;
  margin: 0 auto;
  border-left: 1px solid var(--rule-strong);
  border-right: 1px solid var(--rule-strong);
  /* overflow: hidden; */
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 1rem;
  z-index: 1000;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

.hide-sm {
  display: inline-flex;
}

/* ==========================================================================
   Topbar and mobile menu
   ========================================================================== */

.topbar {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--rule-strong);
  background: var(--bg);
}

.brand {
  width: max-content;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.brand-avatar {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  object-fit: cover;
  background: var(--surface-2);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.topbar-link {
  color: var(--ink);
  font-size: 0.86rem;
  font-weight: 650;
  text-decoration: none;
}

.topbar-link:hover {
  color: var(--accent);
  text-decoration: underline;
}

.icon-button {
  width: 2.35rem;
  height: 2.35rem;
  display: inline-grid;
  place-items: center;
  border: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.icon-button:hover {
  color: var(--accent);
}

.icon-button svg {
  width: 1.45rem;
  height: 1.45rem;
  fill: currentColor;
}

.theme-icon-moon,
:root[data-theme="dark"] .theme-icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-icon-moon {
  display: block;
}

.menu-toggle {
  display: none;
}

.menu-close-icon,
body.menu-open .menu-open-icon {
  display: none;
}

body.menu-open .menu-close-icon {
  display: block;
}

.mobile-menu {
  display: none;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  display: grid;
  gap: 0.4rem;
  padding: 1.6rem 0.75rem 1.3rem;
}

.site-footer p {
  color: var(--ink-3);
  font-size: 0.82rem;
}

.site-footer strong {
  color: var(--ink);
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.footer-small {
  padding-top: 0.55rem;
  border-top: 1px solid var(--rule);
}

/* ==========================================================================
   Responsive (shared chrome)
   ========================================================================== */

@media (max-width: 810px) {
  .site-frame {
    border-left: 0;
    border-right: 0;
  }

  .hide-sm {
    display: none;
  }

  .menu-toggle {
    display: inline-grid;
  }

  .topbar {
    position: sticky;
    top: 0;
    z-index: 50;
  }

  .mobile-menu {
    position: sticky;
    top: 3.65rem;
    z-index: 45;
    display: none;
    padding: 0.7rem;
    border-bottom: 1px solid var(--rule-strong);
    background: var(--bg);
  }

  body.menu-open .mobile-menu {
    display: grid;
    gap: 0.45rem;
  }

  .mobile-menu a {
    display: block;
    padding: 0.8rem 0.85rem;
    border: 1px solid var(--rule);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--ink);
    font-size: 0.93rem;
    font-weight: 650;
    text-decoration: none;
  }

  .mobile-menu a:hover {
    color: var(--accent);
    border-color: var(--blue-line);
  }

  .brand-avatar {
    display: none;
  }

  /* avatar effect */
  .show-on-scroll {
    display: block;
  }

  .topbar-actions {
    gap: 0.1rem;
  }
}

@media (max-width: 420px) {
  html {
    font-size: 15px;
  }

  .brand span {
    max-width: 9.5rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}