/* === branding.tools Design System === */
/* Light mode - Professional & Trustworthy */

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

:root {
  /* Backgrounds */
  --bg-body: #FFFFFF;
  --bg-surface: #F7F8FA;
  --bg-card: #FFFFFF;
  --bg-input: #FFFFFF;
  --bg-hover: #F0F1F3;

  /* Borders */
  --border: rgba(0,0,0,0.08);
  --border-hover: rgba(0,0,0,0.15);
  --border-focus: rgba(58,87,252,0.5);

  /* Text - WCAG AA compliant on white (#FFF) */
  --text-primary: #1a1a2e;      /* ~15.4:1 */
  --text-secondary: #4b5563;    /* ~7.2:1 */
  --text-muted: #6b7280;        /* ~4.6:1 */

  /* Accent - Ahrefs Orange + Blue */
  --accent-orange: #FF8D00;
  --accent-blue: #3A57FC;
  --accent-gradient: linear-gradient(135deg, var(--accent-orange), #FF7524);
  --accent-glow: rgba(0,0,0,0.06);

  /* Semantic */
  --success: #16a34a;
  --warning: #d97706;
  --error: #dc2626;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 50px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);

  /* Layout */
  --max-width: 1200px;
  --nav-height: 64px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* --- Typography --- */
h1 { font-size: 2.5rem; font-weight: 800; line-height: 1.2; letter-spacing: -0.02em; color: var(--text-primary); }
h2 { font-size: 1.5rem; font-weight: 700; line-height: 1.3; color: var(--text-primary); }
h3 { font-size: 1.125rem; font-weight: 600; color: var(--text-primary); }
p { color: var(--text-secondary); }
a { color: var(--accent-blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Layout --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-lg); }
.tool-container { max-width: 800px; margin: 0 auto; padding: 0 var(--space-lg); }

/* --- Navigation --- */
.nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  display: flex; align-items: center;
}
.nav .container {
  display: flex; align-items: center; justify-content: space-between; width: 100%;
}
.nav-logo {
  display: flex; align-items: center; gap: var(--space-sm);
  font-size: 1.125rem; font-weight: 800; color: var(--text-primary);
  text-decoration: none;
}
.nav-logo:hover { text-decoration: none; }
.nav-logo img { border-radius: var(--radius-sm); }
.nav-logo picture { display: flex; flex-shrink: 0; }
.nav-links { display: flex; gap: var(--space-lg); align-items: center; }
.nav-links a { color: var(--text-secondary); font-size: 0.875rem; font-weight: 500; }
.nav-links a:hover { color: var(--text-primary); text-decoration: none; }
.nav-cta {
  background: var(--accent-orange); color: #fff; padding: 8px 20px;
  border-radius: var(--radius-pill); font-weight: 600; font-size: 0.875rem;
  box-shadow: 0 2px 8px rgba(255,141,0,0.25);
}
.nav-cta:hover { opacity: 0.9; text-decoration: none; transform: translateY(-1px); }

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}
.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  padding: 10px 22px; border-radius: var(--radius-pill);
  font-weight: 600; font-size: 0.875rem; cursor: pointer;
  border: none; transition: all 0.15s ease;
}
.btn-primary {
  background: var(--accent-orange); color: #fff;
  box-shadow: 0 2px 8px rgba(255,141,0,0.25);
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(255,141,0,0.3); }
.btn-secondary {
  background: var(--bg-card); color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--border-hover); background: var(--bg-hover); }
.btn-ghost {
  background: transparent; color: var(--text-secondary); padding: 8px 12px;
}
.btn-ghost:hover { color: var(--text-primary); background: var(--bg-hover); border-radius: var(--radius-sm); }

/* --- Forms --- */
input, textarea, select {
  width: 100%; padding: 12px 16px;
  background: var(--bg-input); color: var(--text-primary);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: 0.9375rem; font-family: var(--font-sans);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
input:focus, textarea:focus, select:focus {
  outline: none; border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(58,87,252,0.1);
}
input::placeholder, textarea::placeholder { color: var(--text-muted); }
label {
  display: block; font-size: 0.8125rem; font-weight: 600;
  color: var(--text-secondary); margin-bottom: var(--space-xs);
  text-transform: uppercase; letter-spacing: 0.05em;
}

/* --- Tool Output --- */
.output-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
}
.output-actions {
  display: flex; gap: var(--space-sm); margin-top: var(--space-md);
  flex-wrap: wrap;
}

/* --- Color Swatch --- */
.swatch {
  width: 48px; height: 48px; border-radius: var(--radius-sm);
  border: 2px solid var(--border); cursor: pointer;
  transition: transform 0.15s ease;
  box-shadow: var(--shadow-sm);
}
.swatch:hover { transform: scale(1.1); }

/* --- Wizard Progress Bar --- */
.wizard-bar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: var(--space-sm) 0;
  display: none;
}
.wizard-bar.active { display: block; }
.wizard-bar .container {
  display: flex; align-items: center; justify-content: space-between;
}
.wizard-progress {
  display: flex; gap: var(--space-xs); align-items: center;
}
.wizard-step {
  width: 32px; height: 4px; border-radius: 2px;
  background: #e5e7eb;
}
.wizard-step.done { background: var(--accent-orange); }
.wizard-step.current { background: var(--accent-blue); }

/* --- Continue Building Banner (for organic SEO visitors) --- */
.continue-banner {
  background: #FFF7ED;
  border: 1px solid rgba(255,141,0,0.2);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-xl);
  display: flex; align-items: center; justify-content: space-between;
}

/* --- Tool Grid (for /tools/ page) --- */
.tool-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-decoration: none; color: inherit;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}
.tool-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  text-decoration: none;
}
.tool-card h3 { margin-bottom: var(--space-xs); }
.tool-card p { font-size: 0.875rem; }
.tool-card-icon { font-size: 2rem; margin-bottom: var(--space-md); }

/* --- SEO Content Section --- */
.seo-content {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}
.seo-content h2 { margin-bottom: var(--space-md); }
.seo-content p { margin-bottom: var(--space-md); line-height: 1.7; }
.seo-content ul, .seo-content ol { margin-bottom: var(--space-md); padding-left: var(--space-lg); }
.seo-content li { margin-bottom: var(--space-sm); color: var(--text-secondary); }

/* --- FAQ Section (FAQPage schema target) --- */
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: var(--space-md) 0;
}
.faq-question {
  font-weight: 600; color: var(--text-primary);
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
}
.faq-question::after { content: '+'; font-size: 1.25rem; color: var(--text-muted); transition: transform 0.2s; }
.faq-item.open .faq-question::after { transform: rotate(45deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
  color: var(--text-secondary); line-height: 1.7;
}
.faq-item.open .faq-answer { max-height: 500px; padding-top: var(--space-sm); }

/* --- Related Tools --- */
.related-tools {
  margin-top: var(--space-2xl);
}
.related-tools h2 { margin-bottom: var(--space-lg); }

/* --- Footer --- */
.footer {
  margin-top: var(--space-3xl);
  padding: var(--space-2xl) 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer-links { display: flex; justify-content: center; gap: var(--space-lg); margin-bottom: var(--space-md); }
.footer-links a { color: var(--text-secondary); font-size: 0.8125rem; }
.footer-links a:hover { color: var(--text-primary); }
.footer-copy { color: var(--text-muted); font-size: 0.75rem; }

/* --- Responsive --- */
@media (max-width: 768px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.25rem; }
  .container, .tool-container { padding: 0 var(--space-md); }
  .nav-links { gap: var(--space-md); }
  .tool-grid { grid-template-columns: 1fr; }
  .continue-banner { flex-direction: column; gap: var(--space-sm); text-align: center; }
}

/* --- Utility --- */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.gradient-text { color: var(--accent-orange); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.text-center { text-align: center; }
.hidden { display: none !important; }