/* Ultimate Converter - Modern Design System */

/* CSS Reset */
* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */
:root {
  /* Colors - Primary Palette */
  --color-primary-50: #f0f9ff;
  --color-primary-100: #e0f2fe;
  --color-primary-200: #bae6fd;
  --color-primary-300: #7dd3fc;
  --color-primary-400: #38bdf8;
  --color-primary-500: #0ea5e9;
  --color-primary-600: #0284c7;
  --color-primary-700: #0369a1;
  --color-primary-800: #075985;
  --color-primary-900: #0c4a6e;
  --color-primary-950: #082f49;

  /* Colors - Accent Palette */
  --color-accent-50: #fdf4ff;
  --color-accent-100: #fae8ff;
  --color-accent-200: #f5d0fe;
  --color-accent-300: #f0abfc;
  --color-accent-400: #e879f9;
  --color-accent-500: #d946ef;
  --color-accent-600: #c026d3;
  --color-accent-700: #a21caf;
  --color-accent-800: #86198f;
  --color-accent-900: #701a75;

  /* Colors - Neutral Palette */
  --color-neutral-0: #ffffff;
  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;
  --color-neutral-950: #020617;

  /* Colors - Semantic */
  --color-success-50: #ecfdf5;
  --color-success-500: #10b981;
  --color-success-600: #059669;

  --color-warning-50: #fffbeb;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;

  --color-error-50: #fef2f2;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;

  /* Typography */
  --font-family-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --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-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.25);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-backdrop: blur(16px) saturate(180%);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 600ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ========================================
   Base Styles & Typography
   ======================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family-body);
  font-weight: 400;
  color: var(--color-neutral-800);
  background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--color-accent-50) 100%);
  min-height: 100vh;
  position: relative;
  width: 100%;
  overflow-x: hidden;
}

/* Background Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(circle at 25% 25%, rgba(14, 165, 233, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(217, 70, 239, 0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* Typography Scale */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-family-display);
  font-weight: 700;
  line-height: var(--leading-tight);
  margin: 0;
  letter-spacing: -0.025em;
}

h1 {
  font-size: var(--text-6xl);
  background: linear-gradient(135deg, var(--color-primary-600), var(--color-accent-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 900;
  letter-spacing: -0.025em;
}

@media (max-width: 768px) {
  h1 {
    font-size: var(--text-4xl);
  }
}

h2 {
  font-size: var(--text-3xl);
  color: var(--color-neutral-800);
}

h3 {
  font-size: var(--text-xl);
  color: var(--color-neutral-700);
  font-weight: 600;
}

p {
  margin: 0;
  line-height: var(--leading-normal);
}

/* ========================================
   Layout Components
   ======================================== */

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-cols-1 {
  grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (min-width: 640px) {
  .sm\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sm\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .md\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .md\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .lg\:grid-cols-5 {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* ========================================
   Card Components
   ======================================== */

.card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(16px);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2xl);
  border-color: rgba(14, 165, 233, 0.3);
}

.card:hover::before {
  opacity: 1;
}

.card-content {
  padding: var(--space-6);
}

/* Glass Card Variant */
.card-glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-backdrop);
}

/* Tool Card Specific */
.tool-card {
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.tool-card .tool-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-primary-100), var(--color-accent-100));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  transition: all var(--transition-normal);
  overflow: hidden;
  position: relative;
}

.tool-card .tool-icon::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-accent-500));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.tool-card:hover .tool-icon::before {
  opacity: 1;
}

.tool-card .tool-icon img {
  width: 32px;
  height: 32px;
  position: relative;
  z-index: 1;
  filter: brightness(0.8);
  transition: all var(--transition-normal);
}

.tool-card:hover .tool-icon img {
  filter: brightness(1) contrast(1.1);
  transform: scale(1.05);
}

.tool-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-neutral-800);
  margin-bottom: var(--space-2);
  transition: color var(--transition-normal);
}

.tool-card:hover .tool-title {
  color: var(--color-primary-600);
}

.tool-description {
  font-size: var(--text-sm);
  color: var(--color-neutral-600);
  line-height: var(--leading-relaxed);
}

.tool-category {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--color-neutral-100);
  color: var(--color-neutral-600);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  margin-top: var(--space-3);
  transition: all var(--transition-normal);
}

.tool-card:hover .tool-category {
  background: var(--color-primary-100);
  color: var(--color-primary-700);
}

/* ========================================
   Button Components
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-family-display);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, rgba(255, 255, 255, 0.1), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.btn:hover::before {
  opacity: 1;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* Button Variants */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-700));
  color: white;
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
}

.btn-secondary {
  background: var(--color-neutral-0);
  color: var(--color-neutral-700);
  border: 1px solid var(--color-neutral-200);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--color-neutral-50);
  border-color: var(--color-neutral-300);
  transform: translateY(-1px);
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent-500), var(--color-accent-600));
  color: white;
  box-shadow: var(--shadow-lg);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--color-accent-400), var(--color-accent-500));
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

/* ========================================
   Form Components
   ======================================== */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-neutral-700);
}

.form-input,
.form-select,
.form-textarea {
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-family-body);
  font-size: var(--text-base);
  border: 2px solid var(--color-neutral-200);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.95);
  transition: all var(--transition-normal);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
  transform: translateY(-1px);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: var(--color-neutral-300);
}

/* File Input Styling */
.form-file {
  position: relative;
  display: block;
  width: 100%;
}

.form-file input[type="file"] {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.form-file-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-6);
  border: 2px dashed var(--color-neutral-300);
  border-radius: var(--radius-xl);
  background: var(--color-neutral-50);
  transition: all var(--transition-normal);
  cursor: pointer;
  text-align: center;
}

.form-file:hover .form-file-label,
.form-file.dragover .form-file-label {
  border-color: var(--color-primary-500);
  background: var(--color-primary-50);
  transform: scale(1.02);
}

.form-file-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-3);
  opacity: 0.6;
}

.form-file-text {
  font-weight: 600;
  color: var(--color-neutral-700);
  margin-bottom: var(--space-1);
}

.form-file-subtext {
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
}

/* ========================================
   Header & Navigation
   ======================================== */

.header {
  position: sticky;
  top: 0;
  background: transparent;
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  z-index: 50;
  transition: all var(--transition-normal);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: inherit;
  font-weight: 700;
  font-size: var(--text-xl);
  transition: all var(--transition-normal);
}

.logo:hover {
  transform: scale(1.05);
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary-600), var(--color-accent-600));
  padding: var(--space-2);
  transition: all var(--transition-normal);
}

.logo:hover .logo-icon {
  transform: rotate(5deg) scale(1.1);
}

/* ========================================
   Progress & Loading States
   ======================================== */

.progress-container {
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-6);
  margin-top: var(--space-6);
}

.progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.progress-title {
  font-weight: 600;
  color: var(--color-neutral-800);
}

.progress-status {
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
  font-weight: 500;
}

.progress-bar-container {
  width: 100%;
  height: 12px;
  background: var(--color-neutral-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-accent-500));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  position: relative;
}

.progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% {
    left: -100%;
  }

  100% {
    left: 100%;
  }
}

/* Download Box */
.download-box {
  margin-top: var(--space-4);
  padding: var(--space-4);
  background: var(--color-success-50);
  border: 1px solid var(--color-success-200);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.download-link {
  color: var(--color-success-600);
  font-weight: 600;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: all var(--transition-normal);
}

.download-link:hover {
  color: var(--color-success-700);
  transform: translateX(2px);
}

/* ========================================
   Alert & Error States
   ======================================== */

.alert {
  padding: var(--space-4);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: start;
  gap: var(--space-3);
  border: 1px solid;
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.alert-success {
  background: var(--color-success-50);
  border-color: var(--color-success-200);
  color: var(--color-success-800);
}

.alert-warning {
  background: var(--color-warning-50);
  border-color: var(--color-warning-200);
  color: var(--color-warning-800);
}

.alert-error {
  background: var(--color-error-50);
  border-color: var(--color-error-200);
  color: var(--color-error-800);
}

/* ========================================
   Animations & Micro-interactions
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease-out;
}

.animate-scale-in {
  animation: scaleIn 0.3s ease-out;
}

.animate-slide-in-right {
  animation: slideInRight 0.4s ease-out;
}

/* Stagger children animations */
.stagger-children>* {
  animation-delay: calc(var(--stagger-delay, 0) * 100ms);
}

/* Hover lift effect */
.hover-lift {
  transition: transform var(--transition-normal);
}

.hover-lift:hover {
  transform: translateY(-2px);
}

/* ========================================
   Mobile Optimizations
   ======================================== */

@media (max-width: 640px) {
  :root {
    --space-6: 1rem;
    --space-8: 1.5rem;
  }

  .container {
    padding: 0 var(--space-4);
  }

  h1 {
    font-size: var(--text-6xl);
  }

  h2 {
    font-size: var(--text-2xl);
  }

  .tool-card .tool-icon {
    width: 48px;
    height: 48px;
  }

  .tool-card .tool-icon img {
    width: 28px;
    height: 28px;
  }

  .btn {
    padding: var(--space-3) var(--space-5);
  }
}

/* ========================================
   Dark Mode Support (Future Enhancement)
   ======================================== */

@media (prefers-color-scheme: dark) {
  /* Dark mode styles can be added here */
}

/* ========================================
   Accessibility Enhancements
   ======================================== */

/* Focus visibility */
.focus\:ring:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.5);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .card {
    border: 2px solid var(--color-neutral-800);
  }

  .btn-primary {
    background: var(--color-neutral-900);
  }
}

/* ========================================
   Tailwind CSS Customizations & Overrides
   ======================================== */

/* Override Tailwind defaults to match our design system */
.border-primary-500 {
  border-color: var(--color-primary-500) !important;
}

.bg-primary-50 {
  background-color: var(--color-primary-50) !important;
}

.bg-primary-100 {
  background-color: var(--color-primary-100) !important;
}

.text-primary-600 {
  color: var(--color-primary-600) !important;
}

.text-primary-700 {
  color: var(--color-primary-700) !important;
}

/* Ensure consistent spacing and typography */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* Force our design system over Tailwind where needed */
.card {
  background: rgba(255, 255, 255, 0.9) !important;
  border-radius: var(--radius-2xl) !important;
  box-shadow: var(--shadow-lg) !important;
  border: 1px solid rgba(255, 255, 255, 0.2) !important;
  backdrop-filter: blur(16px) !important;
}