/* ==========================================================================
   CSSCraft – Free CSS Design Toolkit
   Global Stylesheet (main.css)
   ========================================================================== */

:root {
  /* Colors - Light Theme (Default) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-elevated: #ffffff;
  --bg-code: #0f172a;
  
  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;
  --border-focus: #6366f1;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --brand-primary: #6366f1;
  --brand-primary-hover: #4f46e5;
  --brand-primary-light: #eef2ff;
  --brand-secondary: #8b5cf6;
  --brand-accent: #ec4899;
  --brand-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  --brand-glow: rgba(99, 102, 241, 0.25);

  --success: #10b981;
  --success-bg: #ecfdf5;
  --warning: #f59e0b;
  --error: #ef4444;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-colored: 0 10px 25px -5px var(--brand-glow);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Layout */
  --container-max: 1200px;
  --header-height: 72px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

[data-theme="dark"] {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --bg-elevated: #1e293b;
  --bg-code: #050811;

  --border-subtle: #1e293b;
  --border-strong: #334155;
  --border-focus: #818cf8;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --brand-primary: #818cf8;
  --brand-primary-hover: #6366f1;
  --brand-primary-light: rgba(99, 102, 241, 0.15);
  --brand-secondary: #a78bfa;
  --brand-accent: #f472b6;
  --brand-glow: rgba(129, 140, 248, 0.3);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 20px 30px rgba(0, 0, 0, 0.7);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

/* Accessible focus outline */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.site-main {
  flex: 1;
}

/* ==========================================================================
   Navigation Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="dark"] .site-header {
  background: rgba(9, 13, 22, 0.85);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--brand-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 10px var(--brand-glow);
}

.logo-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

.logo-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--brand-primary-light);
  color: var(--brand-primary);
  border: 1px solid var(--border-subtle);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--brand-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--brand-primary);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
  background: var(--brand-primary-light);
}

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

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

/* Mobile Menu Toggle */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

/* Mobile Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 1.5rem;
  flex-direction: column;
  gap: 1.25rem;
  z-index: 99;
  overflow-y: auto;
}

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

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  list-style: none;
}

.mobile-nav-link {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  color: var(--text-secondary);
}

.mobile-nav-link:hover, .mobile-nav-link.active {
  background: var(--brand-primary-light);
  color: var(--brand-primary);
}

/* ==========================================================================
   Buttons & UI Elements
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--brand-primary);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  background: var(--brand-primary-hover);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
  transform: translateY(-1px);
}

.btn-gradient {
  background: var(--brand-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--brand-glow);
}

.btn-gradient:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--brand-glow);
}

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

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--brand-primary);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.8125rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1.0625rem;
  border-radius: var(--radius-lg);
}

.btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.btn-icon:hover {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
}

/* ==========================================================================
   Badges, Pills, Forms
   ========================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--brand-primary-light);
  color: var(--brand-primary);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.form-label {
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.9375rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-primary-light);
}

.form-range {
  width: 100%;
  accent-color: var(--brand-primary);
  cursor: pointer;
  height: 6px;
  background: var(--border-strong);
  border-radius: var(--radius-full);
}

.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.color-input {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  width: 40px;
  height: 40px;
  border: none;
  cursor: pointer;
  background: transparent;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.color-input::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-input::-webkit-color-swatch {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Breadcrumb Navigation
   ========================================================================== */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

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

.breadcrumbs a:hover {
  color: var(--brand-primary);
}

.breadcrumbs-separator {
  color: var(--text-muted);
}

/* ==========================================================================
   Code Output Box
   ========================================================================== */
.code-panel {
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-top: 1.5rem;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-title {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: #94a3b8;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.code-title::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
}

.code-actions {
  display: flex;
  gap: 0.5rem;
}

.code-content {
  padding: 1.25rem;
  max-height: 250px;
  overflow-y: auto;
}

.code-content pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: #e2e8f0;
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.6;
}

/* ==========================================================================
   AdSense Placement Containers (Clean, Disclosive, Ready)
   ========================================================================== */
.ad-slot-wrapper {
  margin: 2.5rem 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.ad-placeholder {
  width: 100%;
  max-width: 728px;
  min-height: 90px;
  background: var(--bg-secondary);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: all var(--transition-fast);
}

.ad-placeholder span {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  font-size: 0.875rem;
  font-weight: 500;
  animation: toastIn 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  max-width: 360px;
}

.toast.toast-success {
  border-left: 4px solid var(--success);
}

.toast.toast-error {
  border-left: 4px solid var(--error);
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes toastOut {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(10px) scale(0.95);
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2rem;
  margin-top: 5rem;
  color: var(--text-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  margin-top: 1rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text-muted);
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}