/* SEO Lab — shared theme, nav, footer, FAQ, toast, modal, buttons */
/* Used by all new tools; existing 3 tools keep inline CSS until refactored. */

:root {
  --bg: #0a0a0f;
  --bg-2: #12121a;
  --bg-card: #16161f;
  --border: #25252f;
  --text: #f5f5f7;
  --text-dim: #9999a8;
  --accent: #7c5cff;
  --accent-2: #00d4ff;
  --green: #4ade80;
  --danger: #ff5c7c;
  --warning: #fbbf24;
}

[data-theme=light] {
  --bg: #fff;
  --bg-2: #f7f7fa;
  --bg-card: #fff;
  --border: #e5e5ea;
  --text: #0a0a0f;
  --text-dim: #5a5a6a;
  --accent: #5a3fff;
  --accent-2: #0099cc;
  --green: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Nav */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, .85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
[data-theme=light] nav { background: rgba(255, 255, 255, .85); }

.nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 13px;
}

.nav-links {
  display: flex;
  gap: 18px;
  align-items: center;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}
.nav-links a:hover { color: var(--text); }

.theme-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 5px 9px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 13px;
}

/* Page header */
.page-header {
  max-width: 1400px;
  margin: 0 auto;
  padding: 32px 24px 16px;
}

.crumb {
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 8px;
}
.crumb a { color: var(--text-dim); text-decoration: none; }
.crumb a:hover { color: var(--text); }

.page-header h1 {
  font-size: 32px;
  letter-spacing: -1px;
  font-weight: 800;
  margin-bottom: 8px;
}

.page-header p {
  color: var(--text-dim);
  font-size: 16px;
  max-width: 780px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  text-decoration: none;
  transition: all .15s;
  font-family: inherit;
}

.btn-sm { padding: 6px 12px; font-size: 12px; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  border: none;
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(124, 92, 255, .4);
}

.btn-ghost { border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--text-dim); }

.btn-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 18px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--green);
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  opacity: 0;
  transition: all .3s;
  pointer-events: none;
  z-index: 200;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: var(--danger); }

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 300;
  animation: fadeIn .15s ease-out;
}
.modal-backdrop.show { display: flex; }

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  max-width: 420px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .4);
  animation: modalIn .2s cubic-bezier(.16, 1, .3, 1);
}
.modal-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; letter-spacing: -.2px; }
.modal-card p { color: var(--text-dim); font-size: 14px; margin-bottom: 20px; line-height: 1.55; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes modalIn {
  from { transform: translateY(-12px) scale(.97); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}

/* FAQ */
.faq {
  max-width: 1400px;
  margin: 40px auto 0;
  padding: 0 24px;
}

.faq-title {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 18px;
  letter-spacing: -.5px;
}

details {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: border-color .15s;
}
details[open] { border-color: var(--accent); }

summary {
  font-weight: 600;
  font-size: 15px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text);
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+";
  color: var(--text-dim);
  font-size: 22px;
  font-weight: 300;
  line-height: 1;
}
details[open] summary::after { content: "−"; }

details > p, details > ul, details > ol {
  margin-top: 10px;
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.65;
}
details > ul, details > ol { padding-left: 20px; }
details a { color: var(--accent); text-decoration: none; }
details a:hover { text-decoration: underline; }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 30px 24px;
  margin-top: 40px;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--text-dim);
  font-size: 13px;
}

.footer-inner a {
  color: var(--text-dim);
  text-decoration: none;
  margin-left: 18px;
}
.footer-inner a:hover { color: var(--text); }

.footer-tools {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
  font-size: 12px;
}

/* Mobile */
@media (max-width: 600px) {
  .nav-inner { padding: 12px 16px; }
  .nav-links { gap: 12px; }
  .page-header { padding: 24px 16px 12px; }
  .page-header h1 { font-size: 26px; }
  .page-header p { font-size: 14px; }
  .faq { padding: 0 16px; }
  footer { padding: 24px 16px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-inner a { margin-left: 0; margin-right: 14px; }
}