/* tou.tools — shared site chrome (header + footer)
   Used by every public page. Edits here apply sitewide.
   Markup must remain identical across pages — see CLAUDE.md. */

:root {
  --white:    #ffffff;
  --gray-50:  #fafafa;
  --gray-100: #f4f4f5;
  --gray-200: #e4e4e7;
  --gray-300: #d4d4d8;
  --gray-400: #a1a1aa;
  --gray-500: #71717a;
  --gray-600: #52525b;
  --gray-700: #3f3f46;
  --gray-800: #27272a;
  --gray-900: #18181b;
  --black:    #0a0a0b;

  --font-display: 'DM Sans', sans-serif;
  --font-body:    'DM Sans', sans-serif;
  --font-mono:    'DM Sans', sans-serif;

  --nav-h:   80px;
  --pad-x:   24px;
  --max-w:   1160px;
  --r-sm:    6px;
  --r-md:    12px;
  --r-lg:    20px;
  --section: 104px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
a  { color: inherit; text-decoration: none; }
ul { list-style: none; }
img, svg { display: block; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-weight: 500;
  cursor: pointer;
  border: none;
  background: none;
  text-decoration: none;
  transition: background 0.14s, color 0.14s, border-color 0.14s, box-shadow 0.14s;
  white-space: nowrap;
}
.btn-dark {
  background: var(--black);
  color: var(--white);
  padding: 10px 20px;
  font-size: 14px;
  border-radius: var(--r-sm);
}
.btn-dark:hover { background: var(--gray-800); }

.btn-dark-lg {
  background: var(--black);
  color: var(--white);
  padding: 14px 28px;
  font-size: 15px;
  border-radius: var(--r-sm);
  letter-spacing: -0.01em;
}
.btn-dark-lg:hover { background: var(--gray-800); }

/* ─── HEADER ──────────────────────────────────────────────────────────── */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 200;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.site-header.is-scrolled {
  border-bottom-color: var(--gray-200);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.04);
}
.site-header .container { height: 100%; }

.nav {
  min-height: var(--nav-h);
  height: 100%;
  display: flex;
  align-items: center;
  gap: 0;
}
.nav-logo {
  color: var(--black);
  margin-right: auto;
  display: inline-flex;
  align-items: center;
}
.nav-logo svg {
  width: 50px;
  height: 50px;
  display: block;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav-links li { display: flex; align-items: center; }
.nav-links a {
  font-size: 16px;
  font-weight: 500;
  color: var(--gray-800);
  line-height: 1;
  transition: color 0.14s;
}
.nav-links a:hover { color: var(--black); }
.nav-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: 48px;
}
.nav-auth {
  font-size: 16px;
  font-weight: 500;
  color: var(--gray-800);
  line-height: 1;
  transition: color 0.14s;
}
.nav-auth:hover { color: var(--black); }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--gray-800);
  border-radius: 2px;
  transition: transform 0.22s ease, opacity 0.18s ease;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--gray-200);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
}
.nav-mobile.is-open { display: block; }
.nav-mobile ul {
  display: flex;
  flex-direction: column;
  padding: 8px 0;
}
.nav-mobile li + li { border-top: 1px solid var(--gray-200); }
.nav-mobile ul a {
  display: block;
  padding: 16px var(--pad-x);
  font-size: 17px;
  font-weight: 500;
  color: var(--gray-800);
}
.nav-mobile ul a:active { background: var(--gray-100); }
.nav-mobile-cta {
  padding: 16px var(--pad-x) 20px;
  border-top: 1px solid var(--gray-200);
}
.nav-mobile-cta .btn {
  display: flex;
  justify-content: center;
  width: 100%;
}

/* ─── FOOTER ──────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--gray-200);
  padding: 36px 0;
  background: var(--white);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-logo {
  color: var(--black);
  display: inline-flex;
  align-items: center;
}
.footer-logo svg {
  width: 40px;
  height: 40px;
  display: block;
}
.footer-links {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}
.footer-links a {
  font-size: 13px;
  color: var(--gray-400);
  transition: color 0.14s;
}
.footer-links a:hover { color: var(--black); }
.footer-copy {
  font-size: 12px;
  color: var(--gray-400);
}

/* ─── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-auth { display: none; }
  .nav-toggle { display: flex; }
  .nav-actions { gap: 12px; margin-left: auto; }
  .nav-actions .btn-dark { display: none; }
}