/* ==========================================================================
   LAYOUT.CSS — Page Structure & Responsive Layout
   ========================================================================== */

/* ==========================================================================
   Site Header
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(11, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

[data-theme="light"] .site-header {
  background-color: rgba(255, 255, 255, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  gap: var(--space-4);
}

/* ── Logo ──────────────────────────────────────────────────────────────── */

.header-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.header-logo img {
  height: 38px;
  width: auto;
}

.header-logo .logo-dark {
  display: block;
}

.header-logo .logo-light {
  display: none;
}

[data-theme="light"] .header-logo .logo-dark {
  display: none;
}

[data-theme="light"] .header-logo .logo-light {
  display: block;
}

/* ── Desktop Navigation ────────────────────────────────────────────────── */

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
  list-style: none;
}

.nav-item > button {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--transition-fast), background-color var(--transition-fast);
  white-space: nowrap;
}

.nav-item:hover > button,
.nav-item.active > button {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.dropdown-arrow {
  transition: transform var(--transition-fast);
}

.nav-item:hover .dropdown-arrow {
  transform: rotate(180deg);
}

/* ── Nav Dropdown ──────────────────────────────────────────────────────── */

.nav-dropdown,
.nav-dropdown li {
  list-style: none;
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 240px;
  padding: var(--space-2);
  margin: 0;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 100;
}

.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: inherit;
  transition: background-color var(--transition-fast);
}

.nav-dropdown-item:hover {
  background-color: var(--bg-tertiary);
}

.nav-dropdown-item-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.nav-dropdown-item-desc {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  line-height: 1.4;
}

/* ── Header Actions ────────────────────────────────────────────────────── */

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* ── Header Search ─────────────────────────────────────────────────────── */

.header-search {
  position: relative;
  display: flex;
  align-items: center;
}

.search-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-toggle:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.search-panel {
  display: none;
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  min-width: 320px;
  padding: var(--space-3);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 200;
}

.search-panel.active {
  display: block;
}

.search-panel .search-input {
  width: 100%;
  height: 40px;
  padding: var(--space-2) var(--space-3);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  outline: none;
}

.search-panel .search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.search-panel .search-input::placeholder {
  color: var(--text-tertiary);
}

.search-results {
  max-height: 360px;
  overflow-y: auto;
  margin-top: var(--space-2);
}

.search-results:empty {
  display: none;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.search-result-item:hover,
.search-result-item.highlighted {
  background-color: var(--bg-tertiary);
}

.search-result-name {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.search-result-category {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  margin-left: auto;
}

/* ── Theme Toggle ──────────────────────────────────────────────────────── */

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.theme-toggle .icon-sun {
  display: none;
}

.theme-toggle .icon-moon {
  display: block;
}

[data-theme="light"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="light"] .theme-toggle .icon-moon {
  display: none;
}

/* ── Mobile Menu Toggle ────────────────────────────────────────────────── */

.mobile-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Show hamburger by default, hide X */
.mobile-menu-toggle .icon-hamburger {
  display: block;
}

.mobile-menu-toggle .icon-close {
  display: none;
}

/* When menu is open: show X, hide hamburger */
.mobile-menu-toggle.active .icon-hamburger {
  display: none;
}

.mobile-menu-toggle.active .icon-close {
  display: block;
}

/* ==========================================================================
   Mobile Navigation
   ========================================================================== */

.mobile-nav {
  width: 85%;
  max-width: 360px;
  height: 100%;
  background-color: var(--bg-primary);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-4);
}

.mobile-search {
  margin-bottom: var(--space-4);
}

.mobile-search .search-input {
  width: 100%;
  height: 44px;
  padding: var(--space-2) var(--space-3);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  outline: none;
}

.mobile-search .search-input:focus {
  border-color: var(--border-focus);
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 var(--container-padding);
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-nav-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
  font-size: var(--text-xl);
  transition: all var(--transition-fast);
}

.mobile-nav-close:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.mobile-nav-body {
  padding: var(--space-4);
}

/* Mobile nav lists */
.mobile-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Category accordions */
.mobile-nav-category {
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-nav-category-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-4);
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.mobile-nav-category-toggle:hover {
  background-color: var(--bg-tertiary);
}

.mobile-nav-category-toggle .chevron {
  transition: transform var(--transition-fast);
  color: var(--text-tertiary);
}

.mobile-nav-category.open .chevron {
  transform: rotate(180deg);
}

.mobile-nav-links {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0 var(--space-4) var(--space-4);
}

.mobile-nav-category.open .mobile-nav-links {
  display: block;
}

.mobile-nav-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Mobile nav overlay backdrop */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 998;
  background-color: rgba(0, 0, 0, 0.5);
}

.mobile-nav-overlay.active {
  display: flex;
}

/* ==========================================================================
   Hero Section (Homepage)
   ========================================================================== */

.hero {
  text-align: center;
  padding: var(--space-16) 0 var(--space-12);
}

.hero h1 {
  font-size: var(--text-4xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-3);
}

.hero .tagline {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 600px;
  margin: 0 auto;
}

.hero-search {
  max-width: 600px;
  margin: var(--space-8) auto 0;
}

.hero-search .input-wrapper {
  position: relative;
}

.hero-search .search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
  z-index: 1;
}

.hero-search .input-field {
  padding-left: calc(var(--space-4) + 18px + var(--space-3));
}

/* ==========================================================================
   IP Widget (Homepage)
   ========================================================================== */

.ip-widget {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  max-width: 680px;
  margin: var(--space-8) auto;
  padding: var(--space-4) var(--space-6);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.ip-widget-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

.ip-widget-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
}

.ip-widget-address {
  font-family: var(--font-mono);
  font-size: clamp(var(--text-base), 2.5vw, var(--text-xl));
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-all;
}

.ip-widget-location {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.ip-widget-actions {
  display: flex;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* ==========================================================================
   Recently Used Tools (Homepage)
   ========================================================================== */

.recent-tools {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  margin-bottom: var(--space-6);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.recent-tools:empty {
  display: none;
}

.recent-tools-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  white-space: nowrap;
  flex-shrink: 0;
}

.recent-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.recent-chip:hover {
  background-color: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--accent-blue);
}

/* ==========================================================================
   Tool Page Layout
   ========================================================================== */

.tool-page {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-8);
  align-items: start;
}

.tool-page-main {
  min-width: 0;
}

.tool-page-sidebar {
  position: sticky;
  top: calc(64px + var(--space-4));
}

/* ── Breadcrumbs ───────────────────────────────────────────────────────── */

.breadcrumb {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

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

.breadcrumb a:hover {
  color: var(--text-primary);
}

.breadcrumb-separator {
  color: var(--text-tertiary);
  font-size: var(--text-xs);
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 500;
}

/* ── Tool Header ───────────────────────────────────────────────────────── */

.tool-header {
  margin-bottom: var(--space-6);
}

.tool-header h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-2);
}

.tool-header-description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Tool Input Area ───────────────────────────────────────────────────── */

.tool-input-area {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.tool-input-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ── Tool Results ──────────────────────────────────────────────────────── */

.tool-results {
  margin-top: var(--space-6);
}

.tool-results:empty {
  display: none;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-12) 0 var(--space-8);
  margin-top: var(--space-16);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 300px;
}

.footer-brand img {
  height: 28px;
  width: auto;
}

.footer-brand-tagline {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  line-height: 1.5;
}

.footer-nav {
  display: flex;
  gap: var(--space-12);
}

.footer-nav-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-nav-title {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: var(--space-1);
}

.footer-nav-link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-nav-link:hover {
  color: var(--text-primary);
}

/* Privacy notice */
.footer-privacy {
  font-size: var(--text-sm);
  font-style: italic;
  color: var(--text-tertiary);
  line-height: 1.6;
  max-width: 680px;
  margin: 0 auto var(--space-6);
  text-align: center;
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

/* Copyright */
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.footer-bottom a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ==========================================================================
   Page Content
   ========================================================================== */

.page-content {
  min-height: calc(100vh - 64px - 200px);
  padding-top: var(--space-8);
}

/* ==========================================================================
   Static Pages (About, Privacy, Terms, Support)
   ========================================================================== */

.static-page {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-12) var(--container-padding) var(--space-16);
}

.static-page h1 {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  color: var(--text-primary);
}

.static-page h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--text-primary);
}

.static-page h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.static-page p {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.static-page ul {
  margin: 0 0 var(--space-4) var(--space-6);
  padding: 0;
  color: var(--text-secondary);
}

.static-page ul li {
  font-size: var(--text-base);
  line-height: 1.7;
  margin-bottom: var(--space-2);
}

.static-page a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.static-page-section {
  margin-bottom: var(--space-10);
}

.static-page-section:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Responsive Layout
   ========================================================================== */

/* ── Desktop large (1440px+) ───────────────────────────────────────────── */

@media (min-width: 1440px) {
  .hero {
    padding: var(--space-16) 0 var(--space-16);
  }

  .hero h1 {
    font-size: 3rem;
  }

  .category-section {
    margin-top: var(--space-12);
  }
}

/* ── Tablet / Small Desktop (1024px and below) ─────────────────────────── */

@media (max-width: 1024px) {
  /* Header: hide desktop nav, show mobile toggle */
  .header-nav {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
    order: -1;
  }

  /* Center the logo on tablet/mobile */
  .header-inner {
    position: relative;
  }

  .header-logo {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
  }

  /* Tool page: single column */
  .tool-page {
    grid-template-columns: 1fr;
  }

  .tool-page-sidebar {
    position: static;
  }

  /* Footer stacks */
  .footer-top {
    flex-direction: column;
    gap: var(--space-6);
  }

  .footer-brand {
    max-width: none;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: var(--space-8);
  }
}

/* ── Mobile (640px and below) ──────────────────────────────────────────── */

@media (max-width: 640px) {
  /* Header */
  .header-inner {
    height: 56px;
  }

  .header-search {
    display: none;
  }

  /* Scale logo down slightly on small screens */
  .header-logo img {
    height: 30px;
  }

  /* Hero */
  .hero {
    padding: var(--space-10) 0 var(--space-8);
  }

  .hero h1 {
    font-size: var(--text-3xl);
  }

  .hero .tagline {
    font-size: var(--text-base);
  }

  /* IP Widget stacks */
  .ip-widget {
    flex-direction: column;
    text-align: center;
  }

  .ip-widget-actions {
    width: 100%;
    justify-content: center;
  }

  /* Tool page spacing */
  .tool-header h1 {
    font-size: var(--text-2xl);
  }

  .tool-input-area {
    padding: var(--space-4);
  }

  .results-panel {
    padding: var(--space-4);
  }

  .results-meta {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  /* Footer */
  .footer-nav {
    flex-direction: column;
    gap: var(--space-6);
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--space-2);
  }

  .footer-privacy {
    font-size: var(--text-xs);
  }
}