/* ============================================
   imseankim.com Design Tools — Global Styles
   ============================================ */

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

/* Custom Properties */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-card: #141414;
  --bg-input: #1a1a1a;
  --bg-hover: #222222;
  --border: #222222;
  --border-light: #333333;
  --border-hover: #555555;
  --text-primary: #ffffff;
  --text-secondary: #aaaaaa;
  --text-muted: #666666;
  --text-dim: #444444;
  --accent: #4facfe;
  --accent-hover: #3a9aee;
  --danger: #ff5555;
  --success: #43e97b;
  --font-sans: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow: 0 10px 30px rgba(0,0,0,0.3);
  --shadow-lg: 0 20px 50px rgba(0,0,0,0.5);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* ============ Site Header ============ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,10,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header .logo {
  font-size: 0.95rem;
  font-weight: 300;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.site-header .logo span {
  background: linear-gradient(135deg, #ff6b6b, #feca57, #48dbfb, #ff9ff3, #54a0ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-header nav a {
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.site-header nav a:hover,
.site-header nav a.active {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px;
}

/* ============ Ad Banner ============ */
.ad-banner {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 10px 24px;
  text-align: center;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-banner.bottom {
  border-bottom: none;
  border-top: 1px solid var(--border);
}

.ad-placeholder {
  color: var(--text-dim);
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* ============ Site Footer ============ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 24px;
  text-align: center;
}

.site-footer .footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 15px;
}

.site-footer .footer-links a {
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  transition: var(--transition);
}

.site-footer .footer-links a:hover { color: var(--text-primary); }

.site-footer .copyright {
  color: var(--text-dim);
  font-size: 0.7rem;
  letter-spacing: 1px;
}

/* ============ Tool Layout (3-column with side ads) ============ */
.tool-layout {
  display: grid;
  grid-template-columns: 160px 1fr 160px;
  max-width: 1520px;
  margin: 0 auto;
  min-height: calc(100vh - 56px - 100px);
}

.ad-side {
  padding: 20px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  position: sticky;
  top: 56px;
  height: fit-content;
}

.ad-side .ad-unit {
  width: 140px;
  min-height: 600px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-side .ad-placeholder {
  color: var(--text-dim);
  font-size: 0.55rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  writing-mode: vertical-rl;
}

/* ============ Tool Content ============ */
.tool-content {
  min-height: calc(100vh - 56px - 100px);
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

/* In-content ad */
.ad-inline {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 15px;
  margin: 24px 0;
  text-align: center;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-inline .ad-placeholder {
  color: var(--text-dim);
  font-size: 0.65rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

@media (max-width: 1024px) {
  .tool-layout {
    grid-template-columns: 1fr;
  }
  .ad-side { display: none; }
}


/* ============ Related Tools ============ */
.related-tools {
  padding: 40px 24px;
  border-top: 1px solid var(--border);
}

.related-tools h3 {
  font-size: 0.78rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 20px;
  text-align: center;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  max-width: 900px;
  margin: 0 auto;
}

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 12px;
}

.related-card:hover {
  background: var(--bg-hover);
  border-color: var(--border-light);
  transform: translateY(-2px);
}

.related-card .rc-icon { font-size: 1.3rem; }
.related-card .rc-name {
  color: var(--text-secondary);
  font-size: 0.78rem;
  letter-spacing: 1px;
}

/* ============ Toast ============ */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-hover);
  color: var(--text-primary);
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 0.8rem;
  letter-spacing: 1.5px;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
  border: 1px solid var(--border-light);
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* ============ Buttons ============ */
.btn {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  letter-spacing: 1px;
  transition: var(--transition);
  font-family: var(--font-sans);
}
.btn:hover { background: var(--bg-hover); color: var(--text-primary); border-color: var(--border-hover); }
.btn-primary { background: #1a3a5c; border-color: #2a5a8c; color: #7ab8ff; }
.btn-primary:hover { background: #224a6c; }

/* ============ Responsive ============ */
@media (max-width: 768px) {
  .site-header nav { display: none; }
  .site-header nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 56px; left: 0; right: 0;
    background: rgba(10,10,10,0.98);
    backdrop-filter: blur(20px);
    padding: 15px;
    border-bottom: 1px solid var(--border);
  }
  .hamburger { display: block; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .related-grid { grid-template-columns: 1fr; }
}