/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Outfit:wght@400;600;700;800&display=swap');

/* CSS Variables for Premium Design System */
:root {
  --bg-color: #0b0f19;
  --card-bg: rgba(15, 23, 42, 0.65);
  --card-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-primary: #10b981; /* Emerald */
  --accent-secondary: #3b82f6; /* Blue */
  --accent-glow: rgba(16, 185, 129, 0.2);
  --font-title: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-lg: 20px;
  --radius-md: 12px;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  position: relative;
  padding: 2rem 1rem;
}

/* Background Mesh Glow Gradients */
body::before,
body::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.45;
  animation: pulse 10s infinite alternate;
}

body::before {
  background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
  top: -100px;
  right: -50px;
}

body::after {
  background: radial-gradient(circle, var(--accent-secondary) 0%, transparent 70%);
  bottom: -100px;
  left: -50px;
}

@keyframes pulse {
  0% { transform: scale(1) translate(0, 0); }
  100% { transform: scale(1.15) translate(20px, -20px); }
}

/* Main Container Layout */
.container {
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Typography */
h1 {
  font-family: var(--font-title);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  text-align: center;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #ffffff 40%, var(--accent-secondary) 70%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 1.5rem;
}

/* Glassmorphic Card Style */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 
              inset 0 1px 1px rgba(255, 255, 255, 0.05);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-secondary), var(--accent-primary));
  opacity: 0.8;
}

/* Search Input Styling */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.input-label {
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
}

.input-label span {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 400;
}

.url-input-container {
  display: flex;
  position: relative;
}

.url-input {
  width: 100%;
  padding: 1.125rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text-primary);
  background: rgba(15, 23, 42, 0.8);
  border: 1.5px solid var(--card-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: var(--transition-smooth);
  padding-right: 4.5rem;
}

.url-input:focus {
  border-color: var(--accent-secondary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
  background: rgba(15, 23, 42, 0.95);
}

.submit-btn {
  position: absolute;
  right: 6px;
  top: 6px;
  bottom: 6px;
  background: linear-gradient(135deg, var(--accent-secondary) 0%, var(--accent-primary) 100%);
  border: none;
  border-radius: 8px;
  color: #ffffff;
  font-family: var(--font-title);
  font-weight: 700;
  padding: 0 1.25rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-glow);
  filter: brightness(1.1);
}

.submit-btn:active {
  transform: translateY(0);
}

/* Loading Spinner Overlay */
.loading-overlay {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  padding: 2rem 0;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 3px solid rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  border-top-color: var(--accent-primary);
  border-right-color: var(--accent-secondary);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-family: var(--font-title);
  font-weight: 600;
  color: var(--text-secondary);
  animation: pulse-text 1.5s ease-in-out infinite;
}

@keyframes pulse-text {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* Error Message */
.error-box {
  display: none;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.25);
  color: #fca5a5;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.4;
  margin-top: 1rem;
}

/* Model Information Card (Hidden initially) */
.result-card {
  display: none;
  flex-direction: column;
  gap: 1.75rem;
  animation: slide-up 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slide-up {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.model-header {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.model-image-container {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--card-border);
  background: #1e293b;
  flex-shrink: 0;
  position: relative;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.model-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-smooth);
}

.model-image-container:hover .model-image {
  transform: scale(1.06);
}

.model-meta {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.model-title {
  font-family: var(--font-title);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.model-profile {
  font-size: 0.85rem;
  color: var(--accent-secondary);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  align-self: flex-start;
  font-weight: 500;
}

/* Grid for Statistics */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.stat-item {
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: var(--transition-smooth);
}

.stat-item:hover {
  background: rgba(15, 23, 42, 0.6);
  border-color: rgba(255, 255, 255, 0.15);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.stat-value {
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-details {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Slider / Rate Customizer Block */
.calculator-controls {
  border-top: 1px solid var(--card-border);
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.controls-title {
  font-family: var(--font-title);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control-item {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
}

.slider-label {
  color: var(--text-secondary);
}

.slider-val {
  font-family: var(--font-title);
  font-weight: 700;
  color: var(--accent-primary);
}

.custom-range {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 9999px;
  background: #1e293b;
  outline: none;
  transition: var(--transition-smooth);
}

.custom-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--text-primary);
  border: 3px solid var(--accent-primary);
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-glow);
  transition: var(--transition-smooth);
}

.custom-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  background: var(--accent-primary);
  border-color: var(--text-primary);
}

/* Filament Color Swatches */
.filament-section {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.filament-section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.filament-section-title {
  font-family: var(--font-title);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.filament-section-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.filament-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.filament-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.75rem 0.375rem 0.5rem;
  border-radius: 9999px;
  border: 1.5px solid var(--card-border);
  background: rgba(15, 23, 42, 0.5);
  cursor: pointer;
  transition: var(--transition-smooth);
  user-select: none;
}

.filament-pill:hover {
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(15, 23, 42, 0.75);
}

.filament-pill.is-gold {
  border-color: rgba(234, 179, 8, 0.6);
  background: rgba(234, 179, 8, 0.08);
  box-shadow: 0 0 12px rgba(234, 179, 8, 0.1);
}

.filament-swatch {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.15);
  flex-shrink: 0;
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

.filament-info {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.filament-type {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-primary);
}

.filament-weight {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.filament-gold-badge {
  font-size: 0.65rem;
  font-weight: 700;
  color: #eab308;
  background: rgba(234, 179, 8, 0.15);
  border: 1px solid rgba(234, 179, 8, 0.3);
  border-radius: 4px;
  padding: 0.1rem 0.3rem;
  letter-spacing: 0.04em;
  margin-left: 0.15rem;
}

/* Cost Calculation Result Card */
.cost-result-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(59, 130, 246, 0.08) 100%);
  border: 1px dashed rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.05);
}

.cost-label {
  font-family: var(--font-title);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.final-cost {
  font-family: var(--font-title);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--accent-primary);
  text-shadow: 0 0 20px rgba(16, 185, 129, 0.2);
  flex-shrink: 0;
}

/* Calculation breakdown — shown inside the settings modal */
.cost-formula-breakdown {
  display: none;
  background: rgba(16, 185, 129, 0.05);
  border: 1px solid rgba(16, 185, 129, 0.15);
  border-radius: var(--radius-md);
  padding: 0.875rem 1rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.6;
  font-style: italic;
}

.cost-formula-breakdown.has-data {
  display: block;
}

/* Share Button — standalone full-width action */
.share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.875rem 1.5rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-title);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  letter-spacing: 0.01em;
}

.share-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  box-shadow: 0 0 16px rgba(16, 185, 129, 0.1);
  transform: translateY(-1px);
}

.share-btn:active {
  transform: translateY(0);
}

.share-btn.copied {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: rgba(16, 185, 129, 0.06);
}

/* App Header layout */
.app-header {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  padding-right: 3.5rem;
}

.header-main {
  flex-grow: 1;
}

/* Settings Toggle Button */
.settings-btn {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.settings-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
  transform: translateY(-50%) rotate(45deg);
  border-color: var(--accent-secondary);
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.25);
}

/* Settings Modal Drawer */
.settings-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(11, 15, 25, 0.65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  justify-content: center;
  align-items: center;
  padding: 1rem;
}

.settings-modal-content {
  width: 100%;
  max-width: 440px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.05);
  animation: modal-enter 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modal-enter {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.settings-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 0.75rem;
  margin-bottom: 1.25rem;
}

.settings-modal-header h2 {
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 2rem;
  font-weight: 300;
  cursor: pointer;
  line-height: 1;
  transition: var(--transition-smooth);
}

.close-btn:hover {
  color: #ef4444;
}

/* Footer credit */
.footer-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 1rem;
}

/* Mobile responsive adjustments */
@media (max-width: 500px) {
  .app-header {
    padding-right: 0;
    flex-direction: column;
    gap: 1rem;
  }
  .settings-btn {
    position: relative;
    transform: none;
    top: auto;
    right: auto;
    margin: 0 auto;
  }
  .settings-btn:hover {
    transform: rotate(45deg);
  }
  .model-header {
    flex-direction: column;
    text-align: center;
  }
  .model-profile {
    align-self: center;
  }
  .cost-result-box {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  h1 {
    font-size: 1.75rem;
  }
  .card {
    padding: 1.5rem;
  }
  .filament-section-header {
    flex-direction: column;
    gap: 0.15rem;
  }
}