/* ============================================================================ */

/* ============================================================================ */
/* Modal Styles */
/* ============================================================================ */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: var(--blur-md);
  -webkit-backdrop-filter: var(--blur-md);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: var(--z-index-modal);
  animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--color-bg-glass-strong);
  backdrop-filter: var(--blur-lg);
  -webkit-backdrop-filter: var(--blur-lg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  border: 1px solid var(--color-border-glass);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow: hidden;
  animation: modalSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.modal-header {
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-md);
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0;
}

.close-button {
  font-size: var(--font-size-3xl);
  color: var(--color-text-light);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.close-button:hover {
  color: var(--color-text-primary);
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-body p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: var(--line-height-relaxed);
}

.modal-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.modal-link {
  display: block;
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
  border-radius: var(--radius-md);
  text-align: center;
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  transition: all var(--transition-normal);
  border: 2px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.modal-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal-link:hover::before {
  opacity: 1;
}

.modal-link:hover {
  color: var(--color-bg-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
  border-color: transparent;
}

.modal-link span {
  position: relative;
  z-index: 1;
}

.modal-footer {
  border-top: 1px solid var(--color-border-light);
  padding-top: var(--spacing-md);
  text-align: center;
}

.dont-show-again {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  cursor: pointer;
}

.dont-show-again input {
  cursor: pointer;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ============================================================================ */

/* CSS Custom Properties (Variables) */
:root {
  /* Color Palette - Modernized */
  --color-primary: #0066ff;
  --color-primary-light: #3385ff;
  --color-primary-dark: #0052cc;
  --color-primary-darker: #003d99;
  --color-accent: #7c3aed;
  --color-accent-light: #a78bfa;
  --color-success: #10b981;
  --color-success-light: #34d399;
  --color-success-dark: #059669;
  --color-error: #ef4444;
  --color-error-light: #f87171;
  --color-warning: #f59e0b;

  /* Text Colors */
  --color-text-primary: #0f172a;
  --color-text-secondary: #334155;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-text-lighter: #cbd5e1;
  --color-text-lightest: #e2e8f0;

  /* Background Colors - Modernized with transparency support */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-bg-glass: rgba(255, 255, 255, 0.7);
  --color-bg-glass-strong: rgba(255, 255, 255, 0.85);
  --color-bg-gradient-start: #f0f9ff;
  --color-bg-gradient-mid: #e0f2fe;
  --color-bg-gradient-end: #ddd6fe;

  /* Border Colors */
  --color-border-light: #e2e8f0;
  --color-border-medium: #cbd5e1;
  --color-border-glass: rgba(255, 255, 255, 0.3);
  --color-border-error: #fecaca;

  /* Error/Success Background Colors */
  --color-bg-error: #fee2e2;
  --color-bg-error-border: #fecaca;
  --color-error-text: #dc2626;
  --color-bg-success: #d1fae5;
  --color-bg-success-border: #a7f3d0;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 2.5rem;
  --spacing-3xl: 3rem;

  /* Border Radius - More rounded for modern feel */
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --radius-full: 50%;

  /* Shadows - Enhanced with layered shadows */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07),
    0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 20px -3px rgba(0, 0, 0, 0.08),
    0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 35px -5px rgba(0, 0, 0, 0.1),
    0 10px 15px -5px rgba(0, 0, 0, 0.05);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  --shadow-focus: 0 0 0 3px rgba(0, 102, 255, 0.15);
  --shadow-focus-accent: 0 0 0 3px rgba(124, 58, 237, 0.15);
  --shadow-platform-detected: 0 0 0 3px rgba(16, 185, 129, 0.2);
  --shadow-platform-error: 0 0 0 3px rgba(239, 68, 68, 0.2);
  --shadow-glow-primary: 0 0 20px rgba(0, 102, 255, 0.2);
  --shadow-glow-success: 0 0 20px rgba(16, 185, 129, 0.2);

  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
    "Oxygen", "Ubuntu", "Cantarell", sans-serif;
  --font-family-mono: "SF Mono", "Monaco", "Menlo", "Ubuntu Mono", "Consolas", monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.75rem;
  --font-size-3xl: 2.25rem;
  --font-size-4xl: 3rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.75;
  --line-height-tight: 1.25;

  /* Transitions - Smoother animations */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* Z-index */
  --z-index-dropdown: 1000;
  --z-index-modal: 1050;
  --z-index-tooltip: 1100;

  /* Blur effects */
  --blur-sm: blur(4px);
  --blur-md: blur(8px);
  --blur-lg: blur(12px);
  --blur-xl: blur(16px);
}

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

body {
  font-family: var(--font-family-primary);
  line-height: var(--line-height-base);
  color: var(--color-text-secondary);
  background: linear-gradient(
    135deg,
    var(--color-bg-gradient-start) 0%,
    var(--color-bg-gradient-mid) 50%,
    var(--color-bg-gradient-end) 100%
  );
  background-size: 200% 200%;
  animation: gradientShift 15s ease infinite;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Animated gradient background */
@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

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

/* Container and Layout */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
}

/* ============================================================================
   Header Section
   ============================================================================ */
.header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  animation: fadeInDown 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-accent) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
  line-height: var(--line-height-tight);
}

.subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
  font-weight: var(--font-weight-medium);
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================================
   Converter Section
   ============================================================================ */
.converter-section {
  background: var(--color-bg-glass-strong);
  backdrop-filter: var(--blur-lg);
  -webkit-backdrop-filter: var(--blur-lg);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-2xl);
  border: 1px solid var(--color-border-glass);
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: stretch;
  animation: fadeInUp 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  transition: all var(--transition-normal);
}

.converter-section:hover {
  box-shadow: var(--shadow-2xl), var(--shadow-glow-primary);
  transform: translateY(-2px);
}

/* Initial state centering styles */
.converter-section:not(.has-content) {
  text-align: center;
}

.converter-section:not(.has-content) .input-group {
  margin-bottom: var(--spacing-lg);
  text-align: left;
}

.converter-section:not(.has-content) .platform-status {
  margin-bottom: 0;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* Input Groups */
.input-group {
  margin-bottom: var(--spacing-lg);
  animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.03em;
  transition: color var(--transition-fast);
}

.input {
  width: 100%;
  padding: 1rem var(--spacing-lg);
  border: 2px solid var(--color-border-light);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  transition: all var(--transition-normal);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  box-shadow: var(--shadow-sm);
}

.input::placeholder {
  color: var(--color-text-light);
  font-weight: var(--font-weight-normal);
}

.input:hover {
  border-color: var(--color-border-medium);
  box-shadow: var(--shadow-md);
}

.input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-bg-primary);
  box-shadow: var(--shadow-focus), var(--shadow-md);
  transform: translateY(-1px);
}

.input.error {
  border-color: var(--color-error);
  background: var(--color-bg-error);
}

.input.error:focus {
  box-shadow: var(--shadow-platform-error), var(--shadow-md);
}

.input.output {
  background: var(--color-bg-secondary);
  font-family: var(--font-family-mono);
  font-size: 0.9rem;
  color: var(--color-primary);
  cursor: text;
  user-select: all;
}

.input.output:hover {
  background: var(--color-bg-tertiary);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ============================================================================
   Platform Detection Status
   ============================================================================ */
.platform-status {
  margin-bottom: var(--spacing-xl);
  text-align: center;
  animation: fadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.platform-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-lg);
  background: var(--color-bg-secondary);
  transition: all var(--transition-normal);
  font-weight: var(--font-weight-medium);
}

.platform-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background: var(--color-border-medium);
  transition: all var(--transition-normal);
  position: relative;
}

.platform-dot::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-full);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.platform-dot.detected {
  background: var(--color-success);
  box-shadow: var(--shadow-platform-detected), var(--shadow-glow-success);
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.platform-dot.detected::before {
  background: var(--color-success);
  opacity: 0.3;
  animation: ping 1.5s cubic-bezier(0, 0, 0.2, 1) infinite;
}

.platform-dot.error {
  background: var(--color-error);
  box-shadow: var(--shadow-platform-error);
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

@keyframes ping {
  0% {
    transform: scale(1);
    opacity: 0.3;
  }
  75%, 100% {
    transform: scale(2);
    opacity: 0;
  }
}

/* ============================================================================
   Output Components
   ============================================================================ */
.output-container {
  display: flex;
  gap: var(--spacing-sm);
}

.output-container .input {
  flex: 1;
}

.copy-btn {
  padding: 1rem var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-dark) 100%);
  color: var(--color-bg-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.copy-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.2) 100%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.copy-btn:hover {
  background: linear-gradient(135deg, var(--color-success-light) 0%, var(--color-success) 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow-success);
}

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

.copy-btn:active {
  transform: translateY(-1px);
}

.copy-btn.copied {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  animation: successBounce var(--transition-bounce);
}

.copy-icon {
  font-size: var(--font-size-base);
  transition: transform var(--transition-fast);
}

.copy-btn:hover .copy-icon {
  transform: scale(1.1);
}

@keyframes successBounce {
  0%, 100% {
    transform: translateY(-2px) scale(1);
  }
  50% {
    transform: translateY(-2px) scale(1.05);
  }
}

/* ============================================================================
   Result and Error States
   ============================================================================ */

/* Result Section */
.result-section {
  animation: slideIn var(--transition-normal) ease-out;
}

.result-section.hidden {
  display: none !important;
  height: 0;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

/* Error Message */
.error-message {
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-bg-error) 0%, rgba(254, 226, 226, 0.7) 100%);
  color: var(--color-error-text);
  border: 2px solid var(--color-error-light);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  font-weight: var(--font-weight-medium);
  box-shadow: var(--shadow-md);
  animation: shakeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.error-message::before {
  content: '⚠️';
  margin-right: var(--spacing-sm);
}

.error-message.hidden {
  display: none !important;
  height: 0;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

@keyframes shakeIn {
  0% {
    opacity: 0;
    transform: translateX(-10px);
  }
  50% {
    transform: translateX(5px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ============================================================================
   Footer Section
   ============================================================================ */
.footer {
  margin-top: var(--spacing-3xl);
  text-align: center;
}

.footer-content {
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border-light);
}

.footer-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.footer-links {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.footer-note {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.footer-copyright {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--spacing-sm);
  opacity: 0.9;
}

.footer-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-primary-darker);
  text-decoration: underline;
}

.footer-author-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  transition: all var(--transition-normal);
  position: relative;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-accent) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
}

.footer-author-link:hover {
  transform: translateY(-1px);
  background-position: 100% 50%;
  filter: brightness(1.2);
}

.footer-author-link:active {
  transform: translateY(0);
}

/* ============================================================================
   Animations
   ============================================================================ */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================================
   Responsive Design
   ============================================================================ */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-md) 0.75rem;
  }

  .title {
    font-size: var(--font-size-3xl);
  }

  .subtitle {
    font-size: var(--font-size-base);
  }

  .converter-section {
    padding: var(--spacing-lg);
  }

  .output-container {
    flex-direction: column;
  }

  .copy-btn {
    align-self: flex-start;
  }
}

@media (max-width: 480px) {
  .title {
    font-size: var(--font-size-2xl);
  }

  .converter-section {
    padding: var(--spacing-md);
    margin: 0 var(--spacing-sm);
  }
}