/* ==========================================================================
   NeedConvert - State of the Art Design System (Modern CSS)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Vibrant Brand Colors */
  --primary: #e84118;
  --primary-hover: #c23616;
  --primary-light: #ff7979;
  --primary-subtle: rgba(232, 65, 24, 0.08);
  --primary-glow: rgba(232, 65, 24, 0.28);
  --primary-gradient: linear-gradient(135deg, #ff4757 0%, #e84118 100%);
  --primary-gradient-subtle: linear-gradient(135deg, rgba(255, 71, 87, 0.08) 0%, rgba(232, 65, 24, 0.15) 100%);
  
  --secondary: #2f3640;
  --accent: #10b981;
  --accent-glow: rgba(16, 185, 129, 0.25);
  --warning: #f59e0b;
  --info: #00a8ff;
  --purple: #8b5cf6;

  /* Light Theme (Default) */
  --bg-main: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --bg-subtle: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border-color: #e2e8f0;
  --border-focus: rgba(232, 65, 24, 0.4);
  --border-subtle: #f1f5f9;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 6px 16px -2px rgba(0, 0, 0, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 16px 32px -4px rgba(0, 0, 0, 0.1), 0 6px 12px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 25px rgba(232, 65, 24, 0.35);

  /* Layout & Geometry */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* Transitions */
  --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);
}

[data-theme="dark"] {
  --bg-main: #0b0f19;
  --bg-surface: #111827;
  --bg-card: #151c2c;
  --bg-card-hover: #1e293b;
  --bg-nav: rgba(15, 23, 42, 0.88);
  --bg-subtle: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  --border-color: #1e293b;
  --border-focus: rgba(255, 71, 87, 0.5);
  --border-subtle: #151c2c;

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 20px -2px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 36px -4px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
  --shadow-glow: 0 0 35px rgba(255, 71, 87, 0.35);
  --primary-subtle: rgba(255, 71, 87, 0.12);
}

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

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  font-size: 1rem;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

main {
  flex: 1;
}

code, pre, .font-mono {
  font-family: 'JetBrains Mono', monospace;
}

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-sm {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}

.container-lg {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Glassmorphism Classes */
.glass-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-card:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

/* Navigation Bar */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.nav-logo-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
  background: var(--primary-subtle);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Dropdown Menu */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 8px;
  min-width: 240px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  z-index: 1100;
  list-style: none;
}

.dropdown.open .dropdown-menu,
.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-main);
  border-radius: var(--radius-xs);
  transition: background var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--primary-subtle);
  color: var(--primary);
}

.dropdown-divider {
  height: 1px;
  background: var(--border-color);
  margin: 6px 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-card-hover);
  border-color: var(--primary);
  transform: translateY(-1px);
}

.btn-outline-primary {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline-primary:hover:not(:disabled) {
  background: var(--primary-gradient);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn-accent {
  background: var(--accent);
  color: #fff;
}

.btn-accent:hover:not(:disabled) {
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.08rem;
  border-radius: var(--radius-lg);
}

.btn-icon {
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
}

.badge-primary {
  background: var(--primary-subtle);
  color: var(--primary);
  border: 1px solid rgba(232, 65, 24, 0.2);
}

.badge-accent {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.12);
  color: var(--warning);
}

.badge-purple {
  background: rgba(139, 92, 246, 0.12);
  color: var(--purple);
}

/* Hero Section */
.hero {
  padding: 72px 0 48px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 36px;
  font-weight: 400;
}

/* Search Bar Component */
.search-wrapper {
  max-width: 640px;
  margin: 0 auto 32px;
  position: relative;
}

.search-input-box {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 8px 12px 8px 22px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.search-input-box:focus-within {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 1.05rem;
  color: var(--text-main);
  outline: none;
  font-family: inherit;
}

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

.search-shortcut {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  padding: 4px 8px;
  border-radius: var(--radius-xs);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  font-family: monospace;
}

/* Tool Filter Tabs */
.filter-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter-tab-btn {
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-tab-btn:hover {
  color: var(--text-main);
  border-color: var(--primary);
}

.filter-tab-btn.active {
  background: var(--primary-gradient);
  color: #ffffff;
  border-color: transparent;
  box-shadow: var(--shadow-md);
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 24px;
  margin-bottom: 64px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
  text-decoration: none;
  color: inherit;
}

.tool-card:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.tool-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 18px;
}

.tool-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--primary-subtle);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.tool-card:hover .tool-icon-wrapper {
  background: var(--primary-gradient);
  color: #ffffff;
  transform: scale(1.08) rotate(-4deg);
  box-shadow: var(--shadow-glow);
}

.tool-card-title {
  font-size: 1.22rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.tool-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 20px;
  flex: 1;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-light);
  font-weight: 500;
}

.tool-card-action {
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: transform var(--transition-fast);
}

.tool-card:hover .tool-card-action {
  transform: translateX(4px);
}

/* Feature Highlights */
.features-section {
  padding: 64px 0;
  border-top: 1px solid var(--border-color);
  background: var(--bg-surface);
}

.section-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 48px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.feature-box {
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.feature-box:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--primary-subtle);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

/* Interactive Dropzone */
.dropzone-box {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-xl);
  background: var(--bg-card);
  padding: 56px 24px;
  text-align: center;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-normal);
  overflow: hidden;
}

.dropzone-box:hover, .dropzone-box.dragover {
  border-color: var(--primary);
  background: var(--primary-subtle);
  transform: scale(1.005);
}

.dropzone-icon-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--primary-subtle);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  transition: transform var(--transition-fast);
}

.dropzone-box:hover .dropzone-icon-circle {
  transform: scale(1.1) rotate(-6deg);
}

.file-preview-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.file-preview-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 14px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
}

.file-preview-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Converter Interactive Cards */
.converter-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-lg);
  margin-bottom: 40px;
}

.converter-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: center;
}

.swap-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-subtle);
  color: var(--primary);
  border: 1px solid rgba(232, 65, 24, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.swap-btn:hover {
  background: var(--primary-gradient);
  color: #fff;
  transform: rotate(180deg);
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 1rem;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  outline: none;
  font-family: inherit;
  transition: all var(--transition-fast);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-subtle);
  background: var(--bg-card);
}

select.form-control {
  cursor: pointer;
}

/* Flash Alerts */
.alert {
  padding: 14px 20px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.95rem;
  font-weight: 500;
}

.alert-success {
  background: rgba(16, 185, 129, 0.12);
  color: #065f46;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

[data-theme="dark"] .alert-success {
  color: #34d399;
}

.alert-danger {
  background: rgba(239, 68, 68, 0.12);
  color: #991b1b;
  border: 1px solid rgba(239, 68, 68, 0.25);
}

[data-theme="dark"] .alert-danger {
  color: #f87171;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.12);
  color: #92400e;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: none;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 300px;
  max-width: 420px;
  color: var(--text-main);
  pointer-events: auto;
  animation: slideInRight 0.3s forwards cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(50px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Footer */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 64px 0 32px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-top: 12px;
  max-width: 340px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 18px;
  color: var(--text-main);
}

.footer-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  font-size: 0.88rem;
  color: var(--text-light);
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-title { font-size: 2.5rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .converter-row { grid-template-columns: 1fr; }
  .swap-btn { margin: 0 auto; }
}

@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .nav-links { display: none; }
  .tools-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}

/* SVG icon utility */
.icon {
  width: 22px;
  height: 22px;
  stroke-width: 2;
  flex-shrink: 0;
}

.icon-sm { width: 16px; height: 16px; }
.icon-lg { width: 32px; height: 32px; }
.icon-xl { width: 44px; height: 44px; }