/* Custom Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --font-sans: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Premium Color Palette (Sleek Dark Theme) */
  --bg-dark: #0a0c10;
  --bg-card: rgba(18, 22, 30, 0.6);
  --bg-card-hover: rgba(26, 32, 44, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.5); /* Indigo glow */
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  /* Branding Accents */
  --primary: #6366f1; /* Indigo */
  --primary-hover: #4f46e5;
  --secondary: #ec4899; /* Pink */
  
  /* Gradient Sets */
  --gradient-accent: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0) 100%);
  --gradient-glow: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 60%);

  /* Theme-specific Component Backgrounds */
  --bg-input: rgba(10, 12, 16, 0.6);
  --bg-btn-sec: rgba(255, 255, 255, 0.04);
  --bg-btn-sec-hover: rgba(255, 255, 255, 0.08);
  --bg-pre-output: rgba(10, 12, 16, 0.8);
  --bg-nav-btn-hover: rgba(255, 255, 255, 0.03);
  --border-nav-btn-hover: rgba(255, 255, 255, 0.04);
  --bg-mobile-drawer: rgba(10, 12, 16, 0.95);
  --bg-navbar: rgba(10, 12, 16, 0.75);
  --bg-footer: rgba(10, 12, 16, 0.4);
  --bg-toast: rgba(18, 22, 30, 0.95);
  --border-color-hover: rgba(255, 255, 255, 0.12);

  /* System States */
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  
  --max-width: 1200px;
}

/* Light Theme Overrides */
body.light-theme {
  --bg-dark: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.7);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --border-color: rgba(15, 23, 42, 0.08);
  --border-focus: rgba(99, 102, 241, 0.6);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --gradient-card: linear-gradient(180deg, rgba(0, 0, 0, 0.01) 0%, rgba(0, 0, 0, 0) 100%);
  --gradient-glow: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.06) 0%, transparent 60%);

  --bg-input: rgba(255, 255, 255, 0.9);
  --bg-btn-sec: rgba(15, 23, 42, 0.04);
  --bg-btn-sec-hover: rgba(15, 23, 42, 0.08);
  --bg-pre-output: rgba(255, 255, 255, 0.95);
  --bg-nav-btn-hover: rgba(15, 23, 42, 0.02);
  --border-nav-btn-hover: rgba(15, 23, 42, 0.04);
  --bg-mobile-drawer: rgba(241, 245, 249, 0.98);
  --bg-navbar: rgba(255, 255, 255, 0.8);
  --bg-footer: rgba(255, 255, 255, 0.5);
  --bg-toast: rgba(255, 255, 255, 0.95);
  --border-color-hover: rgba(15, 23, 42, 0.15);
}

/* Reset & Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* Decorative Background Glows */
body::before {
  content: '';
  position: absolute;
  top: -10%;
  right: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

body::after {
  content: '';
  position: absolute;
  bottom: -10%;
  left: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.05) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

/* App Layout Container */
.app-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: 100vh;
}

/* Sticky Top Navigation Header */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  background: var(--bg-navbar);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-fast);
}

.navbar-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
}

.logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Desktop Horizontal Nav Links */
.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-button {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.9rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.nav-button svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  opacity: 0.7;
  transition: transform var(--transition-fast);
}

.nav-button:hover {
  color: var(--text-primary);
  background: var(--bg-nav-btn-hover);
  border-color: var(--border-nav-btn-hover);
}

.nav-button.active {
  color: var(--text-primary);
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.2);
  box-shadow: inset 0 0 10px rgba(99, 102, 241, 0.05);
}

.nav-button.active svg {
  color: var(--primary);
  opacity: 1;
}

/* Burger / Mobile Toggle Button */
.burger-menu {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  z-index: 1100;
}

.burger-menu svg {
  width: 24px;
  height: 24px;
}

/* Mobile Nav Drawer overlay */
.mobile-nav-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  height: 0; /* Animated dynamically */
  background: var(--bg-mobile-drawer);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
  z-index: 999;
  transition: height var(--transition-normal);
}

.mobile-nav-drawer.open {
  height: 280px;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  padding: 1.5rem 2rem;
  gap: 0.75rem;
  list-style: none;
}

/* Workspace Main Shell */
.workspace {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
}

/* Page Intro/Title Section */
.workspace-header {
  margin-bottom: 2rem;
  text-align: left;
}

.title-section h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 0.35rem;
}

.title-section p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Top Ads banner container (horizontal) */
.sponsor-slot-top {
  width: 100%;
  height: 90px;
  margin: 0 auto 2.5rem auto;
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.sponsor-slot-top::before {
  content: 'SPONSOR SLOT';
  position: absolute;
  top: 6px;
  left: 10px;
  font-size: 0.6rem;
  font-weight: 700;
  opacity: 0.5;
}

/* Tool Views */
.tool-view {
  display: none;
  animation: fadeIn var(--transition-normal) forwards;
  flex-direction: column;
  gap: 2.5rem;
}

.tool-view.active {
  display: flex;
}

/* Glassmorphic Cards */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color var(--transition-normal);
}

.card:hover {
  border-color: var(--border-color-hover);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Inputs, Textareas, Controls */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  width: 100%;
}

.input-row {
  display: flex;
  gap: 1rem;
  width: 100%;
}

.input-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.textarea-field {
  width: 100%;
  height: 230px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 1rem;
  resize: vertical;
  outline: none;
  transition: all var(--transition-fast);
}

.textarea-field:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--border-focus);
}

.input-field {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 0.8rem 1rem;
  outline: none;
  transition: all var(--transition-fast);
}

.input-field:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--border-focus);
}

/* Buttons styling */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--gradient-accent);
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.25);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
}

.btn-secondary {
  background: var(--bg-btn-sec);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--bg-btn-sec-hover);
}

/* Layout Panels */
.panel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 968px) {
  .panel-grid {
    grid-template-columns: 1fr;
  }
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

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

.btn-icon {
  background: var(--bg-btn-sec);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  color: var(--text-primary);
  background: var(--bg-btn-sec-hover);
}

.pre-output {
  width: 100%;
  height: 230px;
  background: var(--bg-pre-output);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-all;
}

.pre-output.error {
  border-color: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
  background: rgba(239, 68, 68, 0.05);
}

/* Gradient specific layout */
.gradient-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
}

@media (max-width: 968px) {
  .gradient-grid {
    grid-template-columns: 1fr;
  }
}

.gradient-preview-box {
  width: 100%;
  height: 280px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: flex-end;
  padding: 1rem;
}

.gradient-preview-info {
  background: rgba(10, 12, 16, 0.7);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  color: white;
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

.gradient-control-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.color-picker-row {
  display: flex;
  gap: 1rem;
}

.color-input-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(10, 12, 16, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.75rem;
}

.color-dot {
  -webkit-appearance: none;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: transparent;
}

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

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

.color-text-input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  width: 100%;
  outline: none;
}

.slider-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.range-slider {
  flex: 1;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.1);
  height: 6px;
  border-radius: 3px;
  outline: none;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.slider-val {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  min-width: 40px;
  text-align: right;
}

/* QR Code */
.qr-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.qr-output-container {
  width: 240px;
  height: 240px;
  background: white;
  border-radius: var(--radius-md);
  padding: 1rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-output-container canvas, .qr-output-container img {
  width: 100% !important;
  height: 100% !important;
}

.qr-placeholder {
  color: #6b7280;
  font-size: 0.85rem;
  text-align: center;
}

/* Pixel to REM */
.converter-grid {
  display: grid;
  grid-template-columns: 1fr 120px 1fr;
  align-items: center;
  gap: 1.5rem;
}.converter-arrow {
  text-align: center;
  font-size: 1.5rem;
  color: var(--primary);
}

/* Image Compressor & Optimizer */
.drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: rgba(255, 255, 255, 0.01);
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.04);
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

@media (max-width: 768px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

.preview-card {
  background: rgba(10, 12, 16, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
}

.preview-img {
  max-width: 100%;
  max-height: 250px;
  border-radius: var(--radius-sm);
  margin-top: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
  object-fit: contain;
  background: repeating-conic-gradient(rgba(0,0,0,0.2) 0% 25%, rgba(255,255,255,0.05) 0% 50%) 0 / 16px 16px;
}

.reduction-badge {
  background: var(--success);
  color: white;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.8rem;
  margin-left: 0.5rem;
  display: inline-block;
}

/* ==========================================
     SEO BLOG / EDUCATIONAL ARTICLE STYLING
   ========================================== */
.seo-guide-section {
  border-top: 1px solid var(--border-color);
  margin-top: 3.5rem;
  padding-top: 3rem;
}

.seo-article {
  max-width: 850px;
  margin: 0 auto;
}

.seo-article h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.seo-article h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: white;
}

.seo-article p {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.seo-article ul {
  list-style-type: none;
  margin-bottom: 1.5rem;
}

.seo-article li {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  padding-left: 1.25rem;
  position: relative;
}

.seo-article li::before {
  content: "•";
  color: var(--primary);
  font-weight: bold;
  position: absolute;
  left: 0;
  top: 0;
}

.seo-article code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  color: var(--secondary);
}

.seo-callout {
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-left: 4px solid var(--primary);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}

.seo-callout p {
  margin-bottom: 0;
  color: var(--text-primary);
  font-weight: 500;
}

/* Footer layout */
.app-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 2rem;
  text-align: center;
  background: var(--bg-footer);
  backdrop-filter: blur(10px);
}

.app-footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.app-footer p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.app-footer-links {
  display: flex;
  gap: 1.5rem;
}

.app-footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Toast Notification overlay */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 2000;
}

.toast {
  background: var(--bg-toast);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  transform: translateY(100px);
  opacity: 0;
  animation: slideUp var(--transition-normal) forwards;
  min-width: 250px;
}

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

.toast-message { font-size: 0.9rem; font-weight: 500; }
.toast-icon { width: 18px; height: 18px; display: flex; align-items: center; }

/* Global helper classes */
.mt-4 { margin-top: 1rem; }
.w-full { width: 100%; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  to { transform: translateY(0); opacity: 1; }
}

/* Multi-column layout with side ad sidebars */
.main-layout-wrapper {
  display: grid;
  grid-template-columns: 160px 1fr 160px;
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  align-items: start;
}

.sponsor-panel-left, .sponsor-panel-right {
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sponsor-box-vertical {
  background: rgba(10, 12, 16, 0.4);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
}

/* Bottom banner ads */
.sponsor-slot-bottom {
  background: rgba(10, 12, 16, 0.4);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 2rem auto;
  max-width: 728px;
  width: 100%;
  box-sizing: border-box;
}

@media (max-width: 1200px) {
  .main-layout-wrapper {
    grid-template-columns: 1fr;
  }
  .sponsor-panel-left, .sponsor-panel-right {
    display: none;
  }
}

/* Mobile responsive media queries */
@media (max-width: 768px) {
  .navbar-container {
    padding: 0 1.5rem;
  }
  
  .nav-links {
    display: none; /* Hidden, shown in mobile drawer */
  }
  
  .burger-menu {
    display: block;
  }
  
  .workspace {
    padding: 1.5rem;
  }
  
  .workspace-header h1 {
    font-size: 1.6rem;
  }
  
  .converter-grid {
    grid-template-columns: 1fr;
    justify-items: center;
  }
  
  .converter-arrow {
    transform: rotate(90deg);
    margin: 0.5rem 0;
  }
  
  .app-footer-content {
    flex-direction: column;
    text-align: center;
  }
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-left: 1rem;
}

.theme-toggle-btn:hover {
  background: var(--bg-btn-sec-hover);
  border-color: rgba(99, 102, 241, 0.3);
}

.theme-toggle-btn svg {
  fill: currentColor;
  transition: transform var(--transition-normal);
}

.theme-toggle-btn:hover svg {
  transform: rotate(15deg);
}

/* Hide and show icons based on theme */
body.light-theme .theme-toggle-btn .sun-icon {
  display: none;
}
body.light-theme .theme-toggle-btn .moon-icon {
  display: block;
}
body:not(.light-theme) .theme-toggle-btn .sun-icon {
  display: block;
}
body:not(.light-theme) .theme-toggle-btn .moon-icon {
  display: none;
}