/**
 * HK Smart Tools — Layout & Structural Styles
 * Glassmorphic sticky header, spacious container rhythm, and executive navy footer
 */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-5);
  padding-right: var(--space-5);
}

.container-narrow {
  max-width: var(--container-narrow);
}

/* Global Header with Frosted Glass */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.85);
  transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  box-shadow: 0 1px 3px 0 rgba(15, 23, 42, 0.03);
}

[data-theme="dark"] .site-header {
  background-color: rgba(15, 23, 42, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 4px 20px 0 rgba(0, 0, 0, 0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: var(--space-4);
}

.brand-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.brand-link:hover {
  text-decoration: none;
  opacity: 0.95;
}

.brand-link svg {
  height: 44px;
  width: auto;
}

/* Header Navigation (Desktop) */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.9rem;
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.nav-link:hover {
  color: var(--primary-600);
  background-color: rgba(37, 99, 235, 0.06);
  text-decoration: none;
}

.nav-link.active {
  color: var(--primary-700);
  background-color: rgba(37, 99, 235, 0.1);
  border-color: rgba(37, 99, 235, 0.15);
  font-weight: 600;
  text-decoration: none;
}

[data-theme="dark"] .nav-link:hover {
  color: var(--accent-400);
  background-color: rgba(59, 130, 246, 0.12);
}

[data-theme="dark"] .nav-link.active {
  color: #ffffff;
  background-color: rgba(59, 130, 246, 0.2);
  border-color: rgba(59, 130, 246, 0.3);
}

/* Header Action Controls */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-xs);
}

.btn-icon:hover {
  background: var(--bg-surface-subtle);
  color: var(--text-primary);
  border-color: var(--border-medium);
  transform: translateY(-1px);
}

.btn-icon svg {
  width: 20px;
  height: 20px;
}

/* Mobile Hamburger Toggle */
.btn-mobile-toggle {
  display: none;
}

@media (max-width: 900px) {
  .nav-desktop {
    display: none;
  }
  .btn-mobile-toggle {
    display: inline-flex;
  }
}

/* Mobile Navigation Drawer */
.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: -340px;
  width: 320px;
  max-width: 85vw;
  height: 100vh;
  background-color: var(--bg-surface);
  border-left: 1px solid var(--border-subtle);
  z-index: 1050;
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  transition: right var(--transition-slow);
  padding: var(--space-6) var(--space-5);
}

.mobile-nav-drawer.open {
  right: 0;
}

.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 19, 41, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1040;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.mobile-nav-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
}

.mobile-nav-links .nav-link {
  font-size: var(--text-base);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-lg);
  width: 100%;
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  padding: var(--space-4) 0;
  margin: 0;
  font-size: var(--text-sm);
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: 0;
  color: var(--text-muted);
}

.breadcrumbs a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--primary-600);
  text-decoration: underline;
}

.breadcrumbs [aria-current="page"] {
  color: var(--text-primary);
  font-weight: 600;
}

.breadcrumb-separator {
  color: var(--border-medium);
  font-size: 0.75rem;
}

/* Page Layout Grids */
.page-main {
  flex: 1 0 auto;
  padding-top: var(--space-4);
  padding-bottom: var(--space-12);
}

.tool-layout-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: var(--space-8);
  align-items: start;
}

@media (max-width: 1024px) {
  .tool-layout-grid {
    grid-template-columns: 1fr;
  }
}

/* Category & Tool Grids */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-6);
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: var(--space-12) 0 var(--space-10);
  text-align: center;
  background-image: var(--gradient-hero-light);
  overflow: hidden;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

.hero-title-accent {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto var(--space-8);
  line-height: 1.6;
}

/* Pre-Footer Call to Action Banner */
.pre-footer-cta {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-2xl);
  padding: var(--space-10) var(--space-6);
  text-align: center;
  color: #ffffff;
  margin: var(--space-12) 0 var(--space-8);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.pre-footer-cta::before {
  content: "";
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.3) 0%, transparent 70%);
  pointer-events: none;
}

.pre-footer-cta-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  margin-bottom: var(--space-2);
  color: #ffffff;
  position: relative;
}

.pre-footer-cta-desc {
  color: #94a3b8;
  font-size: var(--text-base);
  max-width: 560px;
  margin: 0 auto var(--space-6);
  position: relative;
}

/* Ad Placement Architecture (Controlled, non-deceptive placeholders) */
.ad-slot-container {
  display: block;
  margin: var(--space-6) 0;
  padding: var(--space-2);
  background: var(--bg-surface-subtle);
  border: 1px dashed var(--border-medium);
  border-radius: var(--radius-md);
  text-align: center;
  min-height: 90px;
}

.ad-slot-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--space-1);
}

/* Global Executive Footer (Deep Navy Architecture) */
.site-footer {
  background-color: var(--bg-footer);
  border-top: 1px solid var(--border-footer);
  padding-top: var(--space-16);
  padding-bottom: var(--space-8);
  margin-top: auto;
  color: var(--text-footer-secondary);
  position: relative;
  overflow: hidden;
}

/* Subtle atmospheric glow behind footer brand */
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 10%;
  width: 500px;
  height: 300px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2.2fr repeat(3, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-12);
  position: relative;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }
  .footer-brand {
    grid-column: span 2;
  }
}

@media (max-width: 540px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-brand {
    grid-column: span 1;
  }
}

.footer-brand-title {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--text-footer-primary);
  margin-bottom: var(--space-3);
  text-decoration: none;
}

.footer-brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--gradient-primary);
  border-radius: 8px;
  font-size: 13px;
  color: #ffffff;
  font-weight: 800;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.4);
}

.footer-brand-desc {
  font-size: var(--text-sm);
  color: var(--text-footer-secondary);
  line-height: 1.65;
  max-width: 360px;
  margin-bottom: var(--space-4);
}

.footer-privacy-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: #cbd5e1;
}

.footer-heading {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-footer-primary);
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--space-3);
}

.footer-links a {
  color: var(--text-footer-secondary);
  font-size: var(--text-sm);
  text-decoration: none;
  display: inline-block;
  transition: all var(--transition-fast);
}

.footer-links a:hover {
  color: #ffffff;
  transform: translateX(3px);
  text-decoration: none;
}

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-footer);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--text-footer-muted);
  position: relative;
}

.footer-bottom a {
  color: var(--text-footer-secondary);
}

.footer-bottom a:hover {
  color: #ffffff;
}