/* ==========================================================================
   600IQ - Master Theme & Layout Stylesheet
   Designed for Vercel-inspired Minimalist Aesthetics & High Performance
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design System Tokens & CSS Variables
   -------------------------------------------------------------------------- */
:root {
  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;

  /* Colors (Light Theme Defaults) */
  --bg-canvas: #ffffff;
  --bg-canvas-soft: #fafafa;
  --bg-canvas-soft-2: #f5f5f5;
  --bg-card: #ffffff;
  --bg-card-hover: #fafafa;

  --text-primary: #171717;
  --text-secondary: #525252;
  --text-muted: #888888;

  --border-color: #ebebeb;
  --border-hover: #b5b5b5;
  --border-strong: #171717;

  --accent-primary: #171717;
  --accent-text: #ffffff;
  --accent-blue: #0070f3;
  --accent-blue-soft: rgba(0, 112, 243, 0.08);
  --accent-cyan: #50e3c2;
  --accent-violet: #7928ca;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px rgba(0, 112, 243, 0.15);

  --header-bg: rgba(255, 255, 255, 0.82);
  --badge-bg: #f5f5f5;
  --badge-text: #404040;

  --input-bg: #ffffff;
  --input-border: #e5e5e5;
  --input-placeholder: #9ca3af;

  --mesh-opacity: 0.07;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Overrides */
html[data-theme="dark"] {
  --bg-canvas: #0a0a0a;
  --bg-canvas-soft: #121212;
  --bg-canvas-soft-2: #181818;
  --bg-card: #141414;
  --bg-card-hover: #1f1f1f;

  --text-primary: #f5f5f5;
  --text-secondary: #a3a3a3;
  --text-muted: #737373;

  --border-color: #262626;
  --border-hover: #454545;
  --border-strong: #ffffff;

  --accent-primary: #ffffff;
  --accent-text: #0a0a0a;
  --accent-blue: #0070f3;
  --accent-blue-soft: rgba(0, 112, 243, 0.18);
  --accent-cyan: #50e3c2;
  --accent-violet: #a855f7;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 30px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 25px rgba(0, 112, 243, 0.25);

  --header-bg: rgba(10, 10, 10, 0.82);
  --badge-bg: #222222;
  --badge-text: #d4d4d4;

  --input-bg: #141414;
  --input-border: #262626;
  --input-placeholder: #525252;

  --mesh-opacity: 0.12;
}

/* --------------------------------------------------------------------------
   2. Reset & Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button, input {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

/* Accessible Focus States */
:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: var(--accent-text);
  border: 1px solid var(--accent-primary);
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--bg-canvas-soft);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-canvas-soft-2);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
}

.btn-md {
  padding: 0.5rem 1.15rem;
  font-size: 0.875rem;
}

.btn-sm {
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
}

/* Badges */
.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   3. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  background: var(--text-primary);
  color: var(--bg-canvas);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.5px;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

.logo-number {
  font-weight: 800;
}

.logo-letters {
  color: var(--accent-blue);
  margin-left: 2px;
}

.desktop-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.4rem 0.9rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background-color: var(--bg-canvas-soft-2);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background-color: var(--bg-canvas-soft);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-canvas-soft-2);
}

.sun-icon {
  display: block;
}
.moon-icon {
  display: none;
}

html[data-theme="dark"] .sun-icon {
  display: none;
}
html[data-theme="dark"] .moon-icon {
  display: block;
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-canvas-soft);
  color: var(--text-primary);
}

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

.mobile-menu-btn.active .hamburger-icon {
  display: none;
}

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

.mobile-nav-drawer {
  display: none;
  background-color: var(--bg-canvas);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1.5rem;
}

.mobile-nav-drawer.open {
  display: block;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-nav-link {
  display: block;
  padding: 0.6rem 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
  border-radius: var(--radius-md);
}

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

/* --------------------------------------------------------------------------
   4. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  padding: 5rem 0 3.5rem 0;
  text-align: center;
  overflow: hidden;
}

.hero-mesh-bg {
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 1400px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,112,243,0.18) 0%, rgba(121,40,202,0.12) 40%, rgba(0,0,0,0) 70%);
  pointer-events: none;
  opacity: var(--mesh-opacity);
  filter: blur(60px);
}

.hero-container {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  background-color: var(--badge-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--badge-text);
  margin-bottom: 1.5rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   5. Search Section
   -------------------------------------------------------------------------- */
.search-section {
  padding: 1rem 0 2.5rem 0;
  position: sticky;
  top: 64px;
  z-index: 90;
}

.search-box-wrapper {
  max-width: 720px;
  margin: 0 auto;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-full);
  padding: 0.4rem 0.6rem 0.4rem 1.2rem;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.search-box:focus-within {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px var(--accent-blue-soft), var(--shadow-lg);
}

.search-icon {
  color: var(--text-muted);
  flex-shrink: 0;
  margin-right: 0.75rem;
}

.search-input {
  width: 100%;
  height: 44px;
  background: transparent;
  color: var(--text-primary);
  font-size: 1rem;
}

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

.search-clear-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  margin-right: 0.5rem;
}

.search-clear-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-canvas-soft-2);
}

.search-clear-btn.visible {
  display: flex;
}

.search-shortcut {
  flex-shrink: 0;
  padding: 0.2rem 0.5rem;
  background-color: var(--bg-canvas-soft-2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  user-select: none;
}

.search-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 720px;
  margin: 0.75rem auto 0 auto;
  padding: 0 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.active-filter-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0.6rem;
  background-color: var(--accent-blue-soft);
  color: var(--accent-blue);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
}

.active-filter-badge button {
  color: inherit;
  font-size: 0.85rem;
}

/* --------------------------------------------------------------------------
   6. Sections & Cards
   -------------------------------------------------------------------------- */
.section {
  padding: 3rem 0;
}

.section-header {
  margin-bottom: 2rem;
}

.flex-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
}

.section-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-blue);
  margin-bottom: 0.4rem;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

/* Tool Card */
.tool-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: all var(--transition-fast);

  text-decoration: none;
}

.tool-card:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.tool-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.tool-icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background-color: var(--bg-canvas-soft-2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1.35rem;
  flex-shrink: 0;
}

.tool-category-tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  background-color: var(--badge-bg);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
}

.tool-card-body {
  flex-grow: 1;
}

.tool-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.tool-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 1.25rem;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.open-tool-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-blue);
}

.tool-card:hover .open-tool-link svg {
  transform: translateX(3px);
}

.open-tool-link svg {
  transition: transform var(--transition-fast);
}

/* --------------------------------------------------------------------------
   7. Categories Section
   -------------------------------------------------------------------------- */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.category-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.category-card:hover, .category-card.active {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.category-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.category-icon {
  font-size: 1.25rem;
}

.category-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.category-count {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  background-color: var(--badge-bg);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
}

/* Category Filter Pills */
.category-pills-wrapper {
  margin-bottom: 1.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  -webkit-overflow-scrolling: touch;
}

.category-pills {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: nowrap;
}

.pill-btn {
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  background-color: var(--bg-canvas-soft);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.pill-btn:hover {
  background-color: var(--bg-canvas-soft-2);
  color: var(--text-primary);
}

.pill-btn.active {
  background-color: var(--accent-primary);
  color: var(--accent-text);
  border-color: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   8. Empty State & About Section
   -------------------------------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: 4rem 1.5rem;
  background-color: var(--bg-canvas-soft);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 540px;
  margin: 2rem auto;
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.empty-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.empty-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* About Card */
.about-card {
  background-color: var(--bg-canvas-soft);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.about-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.about-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 800px;
  margin-bottom: 2rem;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.feature-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.4rem;
}

.feature-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.feature-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   9. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-canvas-soft);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem 0;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  gap: 3rem;
  flex-wrap: wrap;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border-color);
}

.footer-brand {
  max-width: 320px;
}

.footer-tagline {
  margin-top: 0.85rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.footer-links-group {
  display: flex;
  gap: 4rem;
  flex-wrap: wrap;
}

.footer-heading {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  font-size: 0.825rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.6rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
}

.status-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #10b981;
}

/* --------------------------------------------------------------------------
   10. Responsiveness Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero-section {
    padding: 3.5rem 0 2.5rem 0;
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .categories-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }

  .footer-container {
    flex-direction: column;
    gap: 2rem;
  }

  .footer-links-group {
    gap: 2.5rem;
  }
}