/* =====================================================================
   SEO Tools Hub — PHP Edition
   Premium dark theme with glassmorphism accents.
   ===================================================================== */

:root {
  --primary: #0ea5e9;
  --primary-2: #8b5cf6;
  --accent: #22d3ee;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;
  --bg: #0b1120;
  --bg-2: #0f172a;
  --surface: #111c33;
  --surface-2: #1e293b;
  --surface-3: #243559;
  --border: rgba(255,255,255,.08);
  --border-strong: rgba(255,255,255,.16);
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  --shadow: 0 12px 32px rgba(0,0,0,.35);
  --radius: .9rem;
  --gradient-hero: radial-gradient(ellipse at 20% 0%, rgba(14,165,233,.18), transparent 55%),
                    radial-gradient(ellipse at 80% 30%, rgba(139,92,246,.16), transparent 50%);
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-2: #ffffff;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --surface-3: #e2e8f0;
  --border: rgba(15,23,42,.08);
  --border-strong: rgba(15,23,42,.15);
  --text: #0f172a;
  --text-muted: #475569;
  --text-faint: #64748b;
  --shadow: 0 12px 32px rgba(15,23,42,.10);
  --gradient-hero: radial-gradient(ellipse at 20% 0%, rgba(14,165,233,.10), transparent 55%),
                    radial-gradient(ellipse at 80% 30%, rgba(139,92,246,.08), transparent 50%);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  font-size: 16px;
  line-height: 1.55;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }

img, svg { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.2; color: var(--text); margin: 0 0 1rem; }
h1 { font-size: clamp(2rem, 5vw, 3.6rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); letter-spacing: -0.01em; }
h3 { font-size: 1.3rem; }
p  { margin: 0 0 1rem; color: var(--text-muted); }

.container { width: min(1200px, 92%); margin: 0 auto; }
.container-narrow { width: min(760px, 92%); margin: 0 auto; }
.text-center { text-align: center; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(11,17,32,.8);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 1rem;
}
.logo { display: flex; align-items: center; gap: .75rem; color: inherit; }
.logo-icon { font-size: 1.5rem; }
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-text strong { font-size: 1rem; }
.logo-text small { font-size: .7rem; color: var(--text-muted); }
.main-nav { display: flex; gap: 1.5rem; }
.main-nav a { color: var(--text-muted); font-size: .9rem; }
.main-nav a:hover { color: var(--text); }
@media (max-width: 768px) { .main-nav { display: none; } }

/* Hero */
.hero {
  position: relative;
  padding: 4rem 0 3rem;
  text-align: center;
  background: var(--gradient-hero);
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.5rem;
}
.hero-sub { max-width: 700px; margin: 0 auto 2rem; font-size: 1.1rem; }
.badge {
  display: inline-block; padding: .35rem .9rem;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 999px; font-size: .75rem; font-weight: 500;
  margin-bottom: 1.5rem;
}
.badge-info { background: rgba(14,165,233,.1); color: var(--primary); border-color: rgba(14,165,233,.3); }

/* Search form */
.search-form {
  display: flex; gap: .5rem; max-width: 600px; margin: 0 auto;
}
.search-form input {
  flex: 1; padding: 1rem 1.25rem;
  background: var(--surface); border: 2px solid var(--border-strong);
  border-radius: 1rem; color: var(--text); font-size: 1rem;
}
.search-form input:focus { outline: none; border-color: var(--primary); }
.search-form button {
  padding: 0 1.5rem; background: var(--primary); color: white;
  border: none; border-radius: 1rem; font-weight: 600; cursor: pointer;
}
.search-form button:hover { background: var(--accent); }

/* Stats */
.stats-strip { padding: 2rem 0; background: var(--bg-2); border-bottom: 1px solid var(--border); }
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem;
}
.stat { text-align: center; }
.stat-icon { font-size: 1.5rem; margin-bottom: .25rem; }
.stat-value { font-size: 1.75rem; font-weight: 800; color: var(--text); }
.stat-label { font-size: .8rem; color: var(--text-muted); }
@media (max-width: 768px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

/* Sections */
.section { padding: 3rem 0; }
.tools-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 2rem; }

/* Category filter */
.cat-filter { display: flex; flex-wrap: wrap; gap: .5rem; justify-content: center; }
.cat-chip {
  padding: .5rem 1rem; background: var(--surface-2); color: var(--text-muted);
  border-radius: 999px; font-size: .85rem; transition: all .2s;
  border: 1px solid transparent;
}
.cat-chip:hover { background: var(--surface-3); color: var(--text); }
.cat-chip.active { background: var(--primary); color: white; }

/* Tools grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}
.tool-card {
  display: block; padding: 1.5rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); color: inherit;
  transition: all .2s;
}
.tool-card:hover {
  border-color: rgba(14,165,233,.4);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.tool-icon {
  width: 40px; height: 40px; margin-bottom: .75rem;
  background: linear-gradient(135deg, rgba(14,165,233,.1), rgba(139,92,246,.1));
  border-radius: .6rem;
  display: flex; align-items: center; justify-content: center;
  color: var(--primary);
}
.tool-icon svg { width: 20px; height: 20px; }
.tool-card h3 { font-size: .95rem; margin-bottom: .35rem; }
.tool-card p { font-size: .8rem; color: var(--text-muted); margin-bottom: .75rem; line-height: 1.4; }
.tool-cat {
  display: inline-block; padding: .2rem .5rem;
  background: var(--surface-3); border-radius: .3rem;
  font-size: .65rem; color: var(--text-muted);
}

/* Features */
.features-section { background: var(--bg-2); }
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem;
}
.feature {
  padding: 1.5rem; background: var(--surface);
  border-radius: var(--radius); border: 1px solid var(--border);
}
.feature-icon { font-size: 2rem; margin-bottom: 1rem; }
.feature h3 { font-size: 1.1rem; margin-bottom: .5rem; }
.feature p { font-size: .9rem; }
@media (max-width: 768px) { .features-grid { grid-template-columns: 1fr; } }

/* Empty state */
.empty-state { text-align: center; padding: 5rem 0; }
.empty-icon { font-size: 4rem; margin-bottom: 1rem; }

/* Tool page */
.tool-hero {
  padding: 2.5rem 0 1.5rem;
  background: var(--gradient-hero);
  border-bottom: 1px solid var(--border);
}
.tool-header { display: flex; align-items: flex-start; gap: 1rem; margin-bottom: 1rem; }
.tool-icon-lg {
  width: 56px; height: 56px; flex-shrink: 0;
  background: linear-gradient(135deg, rgba(14,165,233,.1), rgba(139,92,246,.1));
  border-radius: .8rem;
  display: flex; align-items: center; justify-content: center;
  color: var(--primary);
}
.tool-icon-lg svg { width: 28px; height: 28px; }
.tool-hero h1 { font-size: 1.75rem; margin-bottom: .5rem; }
.tool-hero p { margin-bottom: .75rem; }
.back-link { font-size: .85rem; color: var(--text-muted); }

/* Forms */
.tool-form {
  background: var(--surface); padding: 1.5rem;
  border-radius: var(--radius); border: 1px solid var(--border);
}
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: .85rem; font-weight: 500; margin-bottom: .35rem; color: var(--text); }
.form-group input[type="text"],
.form-group input[type="url"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group input[type="date"],
.form-group input[type="datetime-local"],
.form-group textarea,
.form-group select {
  width: 100%; padding: .65rem .85rem;
  background: var(--bg); border: 1px solid var(--border-strong);
  border-radius: .5rem; color: var(--text); font-size: .9rem;
  font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--primary);
}
.form-group textarea { font-family: 'Courier New', monospace; resize: vertical; min-height: 80px; }
.form-check { margin-bottom: .75rem; }
.form-check label { display: flex; align-items: center; gap: .5rem; font-size: .85rem; cursor: pointer; }
.form-check input[type="checkbox"] { width: 16px; height: 16px; }
.form-actions { margin-top: 1.25rem; }
.checkbox-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: .5rem; }
.checkbox-item { display: flex; align-items: center; gap: .5rem; padding: .5rem; border: 1px solid var(--border); border-radius: .4rem; cursor: pointer; font-size: .85rem; }
.checkbox-item input { margin: 0; }
.checkbox-item:hover { background: var(--surface-2); }

/* Buttons */
.btn {
  display: inline-block; padding: .6rem 1.25rem;
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border-strong); border-radius: .5rem;
  font-size: .9rem; font-weight: 500; cursor: pointer;
  transition: all .2s; text-decoration: none;
}
.btn:hover { background: var(--surface-3); }
.btn-primary { background: var(--primary); color: white; border-color: var(--primary); }
.btn-primary:hover { background: var(--accent); }
.btn-sm { padding: .3rem .6rem; font-size: .8rem; }

/* Grid helpers */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }
.grid-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: .5rem; }
@media (max-width: 600px) { .grid-2, .grid-3, .grid-5 { grid-template-columns: 1fr; } }

/* Color picker */
.color-input-row { display: flex; gap: .5rem; align-items: center; }
.color-input-row input[type="color"] { width: 60px; height: 40px; padding: 0; border: 1px solid var(--border-strong); border-radius: .4rem; cursor: pointer; background: transparent; }

/* FAQ / Breadcrumb rows */
.faq-row, .bc-row, .hreflang-row { display: flex; gap: .5rem; margin-bottom: .5rem; }
.faq-row input, .bc-row input, .hreflang-row input { padding: .5rem; background: var(--bg); border: 1px solid var(--border-strong); border-radius: .4rem; color: var(--text); font-size: .85rem; }

/* Cron */
.cron-field { text-align: center; font-family: monospace; }
.cron-presets { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.cron-presets button { padding: .35rem .75rem; font-size: .75rem; background: var(--surface-2); border: 1px solid var(--border); border-radius: .4rem; color: var(--text-muted); cursor: pointer; }
.cron-presets button:hover { background: var(--surface-3); color: var(--text); }

/* Result area */
.tool-result-area { margin-top: 1.5rem; }
.tool-error-area { margin-top: 1rem; }
.result-box {
  background: var(--surface); padding: 1.25rem;
  border-radius: var(--radius); border: 1px solid var(--border);
  margin-bottom: 1rem;
}
.result-box h4 {
  display: flex; align-items: center; justify-content: space-between;
  font-size: .9rem; margin-bottom: .75rem;
}
.result-box pre {
  background: var(--bg); padding: 1rem; border-radius: .5rem;
  overflow-x: auto; font-size: .8rem; line-height: 1.5;
  white-space: pre-wrap; word-break: break-all;
  font-family: 'Courier New', monospace; color: var(--text);
  max-height: 400px; overflow-y: auto;
}
.stats-row { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: .75rem; margin-bottom: 1rem; }
.stat-card {
  background: var(--bg); padding: .75rem; border-radius: .5rem;
  border: 1px solid var(--border);
}
.stat-card-label { font-size: .7rem; color: var(--text-muted); text-transform: uppercase; }
.stat-card-value { font-size: 1.25rem; font-weight: 700; margin-top: .25rem; }
.stat-card-hint { font-size: .7rem; color: var(--text-faint); margin-top: .15rem; }

/* Progress bar */
.progress-bar { height: 8px; background: var(--surface-2); border-radius: 4px; overflow: hidden; margin: .5rem 0; }
.progress-bar-fill { height: 100%; background: var(--primary); transition: width .3s; }

/* Alert boxes */
.alert { padding: .75rem 1rem; border-radius: .5rem; margin-bottom: 1rem; font-size: .9rem; }
.alert-error { background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.3); color: #fca5a5; }
.alert-success { background: rgba(16,185,129,.1); border: 1px solid rgba(16,185,129,.3); color: #6ee7b7; }
.alert-warning { background: rgba(245,158,11,.1); border: 1px solid rgba(245,158,11,.3); color: #fcd34d; }

/* Loading */
.loading { display: inline-block; width: 16px; height: 16px; border: 2px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* SERP preview */
.serp-preview { background: white; padding: 1rem; border-radius: .5rem; color: #1a0dab; }
.serp-preview .serp-url { font-size: .8rem; color: #006621; }
.serp-preview .serp-title { font-size: 1.1rem; color: #1a0dab; margin: .25rem 0; cursor: pointer; }
.serp-preview .serp-title:hover { text-decoration: underline; }
.serp-preview .serp-desc { font-size: .85rem; color: #545454; }

/* Footer */
.site-footer {
  margin-top: auto;
  background: var(--bg-2); border-top: 1px solid var(--border);
  padding: 3rem 0 1.5rem;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; margin-bottom: 2rem; }
.footer-brand p { font-size: .85rem; max-width: 400px; }
.footer-cats h4 { font-size: .9rem; margin-bottom: .75rem; }
.footer-cats ul { list-style: none; padding: 0; margin: 0; }
.footer-cats li { margin-bottom: .35rem; }
.footer-cats a { font-size: .85rem; color: var(--text-muted); }
.footer-cats a:hover { color: var(--text); }
.footer-bottom { text-align: center; font-size: .8rem; color: var(--text-faint); padding-top: 1.5rem; border-top: 1px solid var(--border); }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; } }

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--surface-3); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

/* Mobile navigation and touch-friendly layout */
.mobile-menu-toggle { display:none; border:1px solid var(--border-strong); background:var(--surface); color:var(--text); border-radius:.65rem; min-width:44px; min-height:44px; font-size:1.25rem; cursor:pointer; }
@media (max-width: 768px) {
  .header-inner { min-height:64px; height:auto; padding:10px 0; position:relative; }
  .mobile-menu-toggle { display:inline-flex; align-items:center; justify-content:center; margin-left:auto; }
  .main-nav { display:none; position:absolute; top:100%; left:0; right:0; padding:.6rem; background:var(--surface); border:1px solid var(--border); border-radius:0 0 .8rem .8rem; box-shadow:var(--shadow); flex-direction:column; gap:.15rem; }
  .main-nav.is-open { display:flex; }
  .main-nav a { padding:.8rem .9rem; border-radius:.55rem; font-size:.95rem; }
  .main-nav a:hover { background:var(--surface-2); }
  .container { width:min(94%, 1200px); }
  .hero { padding:2.5rem 0 2rem; }
  .search-form { flex-direction:column; }
  .search-form button { min-height:48px; }
  .tools-header { align-items:flex-start; gap:1rem; flex-direction:column; }
  .tools-grid { grid-template-columns:1fr; }
  .tool-card { padding:1.2rem; }
  .tool-header { flex-direction:column; }
  .tool-form { padding:1rem; }
  .form-group input, .form-group textarea, .form-group select { font-size:16px; min-height:46px; }
  .form-group textarea { min-height:120px; }
}
@media (max-width: 480px) {
  .stats-grid { gap:.7rem; }
  .stat { padding:.4rem; }
  .stat-value { font-size:1.4rem; }
  .section { padding:2rem 0; }
  h1 { font-size:clamp(1.8rem, 10vw, 2.5rem); }
}

/* Public information pages */
.content-card { background:var(--surface); border:1px solid var(--border); border-radius:1rem; padding:clamp(1.2rem,3vw,2rem); box-shadow:var(--shadow); }
.legal-container { max-width:980px; }
.page-hero { text-align:center; margin-bottom:2rem; }
.page-hero h1 { margin:.75rem 0 .5rem; }
.legal-content { line-height:1.75; }
.legal-content section + section { margin-top:2rem; padding-top:1.5rem; border-top:1px solid var(--border); }
.legal-content h2 { margin-bottom:.65rem; }
.legal-content a, .contact-card a { color:var(--primary); text-decoration:underline; text-underline-offset:2px; }
.legal-content ul { padding-left:1.25rem; }
.contact-grid { display:grid; grid-template-columns:minmax(0,2fr) minmax(260px,1fr); gap:1.25rem; }
.contact-form { display:grid; gap:1rem; margin-top:1.25rem; }
.contact-form label { display:grid; gap:.4rem; font-weight:600; font-size:.9rem; }
.contact-form input, .contact-form textarea { width:100%; box-sizing:border-box; padding:.8rem .9rem; border:1px solid var(--border-strong); border-radius:.6rem; background:var(--bg); color:var(--text); font:inherit; }
.contact-form textarea { resize:vertical; }
.contact-card p + p { margin-top:1.4rem; }
.footer-links { display:flex; flex-wrap:wrap; justify-content:center; gap:.65rem 1.2rem; padding:1rem 0; }
.footer-links a { font-size:.8rem; color:var(--text-muted); }
.footer-links a:hover { color:var(--text); }
.site-header { position:relative; z-index:1000; }
.mobile-menu-toggle { position:relative; z-index:1002; flex-shrink:0; }
@media (max-width: 900px) {
  .header-inner { min-height:64px; height:auto; padding:10px 0; position:relative; }
  .mobile-menu-toggle { display:inline-flex; align-items:center; justify-content:center; margin-left:auto; }
  .main-nav { display:none !important; position:absolute; top:100%; left:0; right:0; width:auto; box-sizing:border-box; padding:.6rem; background:var(--surface); border:1px solid var(--border); border-radius:0 0 .8rem .8rem; box-shadow:var(--shadow); flex-direction:column; gap:.15rem; z-index:1001; }
  .main-nav.is-open { display:flex !important; }
  .main-nav a { display:block; width:100%; box-sizing:border-box; padding:.85rem .9rem; border-radius:.55rem; font-size:.95rem; }
  .main-nav a:hover, .main-nav a:focus-visible { background:var(--surface-2); }
  .contact-grid { grid-template-columns:1fr; }
}
@media (max-width: 600px) {
  .logo-text small { display:none; }
  .logo-text strong { font-size:.95rem; }
  .footer-links { justify-content:flex-start; }
}