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

/* --- CUSTOM PROPERTIES / SYSTEM TOKENS --- */
:root {
  /* Color Palette */
  --bg-base: #080c16;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-card-hover: rgba(31, 41, 55, 0.8);
  --border-color: rgba(255, 255, 255, 0.06);
  --border-color-focus: rgba(6, 182, 212, 0.5);
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  /* Accent Colors & Gradients */
  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --accent-gradient-hover: linear-gradient(135deg, #0891b2 0%, #2563eb 100%);
  --accent-glow: rgba(6, 182, 212, 0.2);
  --accent-glow-hover: rgba(6, 182, 212, 0.35);
  
  --danger: #ef4444;
  --danger-glow: rgba(239, 68, 68, 0.15);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.2);

  /* Layout & Shadows */
  --max-width: 800px;
  --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --inset-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.2);
  
  /* Transitions */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* --- BASE & RESETS --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  background-image: 
    radial-gradient(at 0% 0%, rgba(6, 182, 212, 0.08) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(59, 130, 246, 0.08) 0px, transparent 50%);
  background-attachment: fixed;
}

h1, h2, h3, h4 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --- CONTAINER & LAYOUT --- */
.app-container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0 2rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.brand-logo {
  width: 2.25rem;
  height: 2.25rem;
  background: var(--accent-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px var(--accent-glow);
  transition: var(--transition-bounce);
}

.brand-wrapper:hover .brand-logo {
  transform: rotate(10deg) scale(1.05);
  box-shadow: 0 0 20px var(--accent-glow-hover);
}

.brand-logo svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: #fff;
}

.brand-title {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.btn-nav-back {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  padding: 0.5rem 0.85rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-nav-back:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateX(-3px);
}

.btn-nav-back svg {
  width: 1rem;
  height: 1rem;
  stroke: currentColor;
  stroke-width: 2;
  transition: var(--transition-smooth);
}

/* App Content Area */
#app-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* --- DASHBOARD / HUB HOME --- */
.welcome-section {
  text-align: center;
  margin-bottom: 2.5rem;
}

.welcome-title {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.welcome-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 400;
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 1.75rem;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition-bounce);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: var(--transition-smooth);
}

.tool-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.12);
  background: var(--bg-card-hover);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.5);
}

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

.tool-icon-wrapper {
  width: 3rem;
  height: 3rem;
  border-radius: 12px;
  background: rgba(6, 182, 212, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  transition: var(--transition-smooth);
}

.tool-card:hover .tool-icon-wrapper {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 0 15px var(--accent-glow);
}

.tool-icon-wrapper svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: currentColor;
}

.tool-card-info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.tool-card-title {
  font-size: 1.25rem;
  color: var(--text-primary);
  font-weight: 600;
}

.tool-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.tool-card-arrow {
  margin-top: auto;
  align-self: flex-end;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.85rem;
  font-weight: 600;
  opacity: 0.8;
  transition: var(--transition-smooth);
}

.tool-card:hover .tool-card-arrow {
  opacity: 1;
  transform: translateX(4px);
}

/* --- TOOL COMMON CONTAINER --- */
.tool-view-wrapper {
  animation: fadeIn 0.4s ease-out;
}

.tool-title-section {
  margin-bottom: 1.75rem;
}

.tool-title-header {
  font-size: 1.85rem;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.tool-title-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
}

.floating-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-xl);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  margin-bottom: 2rem;
}

/* --- FORM STYLING --- */
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 500px) {
  .form-grid-col-2 {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
}

.input-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.input-field {
  width: 100%;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius-md);
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-primary);
  box-shadow: var(--inset-shadow);
  transition: var(--transition-smooth);
}

.input-field:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px var(--accent-glow), var(--inset-shadow);
  background: rgba(0, 0, 0, 0.35);
}

.input-field.is-invalid {
  border-color: var(--danger);
}

.input-field.is-invalid:focus {
  box-shadow: 0 0 0 3px var(--danger-glow), var(--inset-shadow);
}

/* Chrome/Safari number arrows removal */
.input-field[type=number]::-webkit-inner-spin-button, 
.input-field[type=number]::-webkit-outer-spin-button { 
  -webkit-appearance: none; 
  margin: 0; 
}
/* Firefox number arrows removal */
.input-field[type=number] {
  -moz-appearance: textfield;
}

/* Custom premium switch toggle */
.switch-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  margin-bottom: 1.5rem;
  transition: var(--transition-smooth);
}

.switch-group:focus-within {
  border-color: rgba(255, 255, 255, 0.15);
}

.switch-label-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.switch-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.switch-desc {
  font-size: 0.775rem;
  color: var(--text-muted);
}

.switch {
  position: relative;
  display: inline-block;
  width: 2.75rem;
  height: 1.5rem;
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #374151;
  transition: .3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 1.15rem;
  width: 1.15rem;
  left: 0.18rem;
  bottom: 0.18rem;
  background-color: #fff;
  transition: .3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

input:checked + .slider {
  background: var(--accent-gradient);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.3);
}

input:checked + .slider:before {
  transform: translateX(1.22rem);
}

/* Button Call-to-action */
.btn-generate {
  width: 100%;
  background: var(--accent-gradient);
  border: none;
  padding: 1rem;
  border-radius: var(--border-radius-md);
  color: #fff;
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  box-shadow: 0 4px 15px var(--accent-glow);
  transition: var(--transition-bounce);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
}

.btn-generate:hover {
  background: var(--accent-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-glow-hover);
}

.btn-generate:active {
  transform: scale(0.98);
}

.btn-generate svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

/* Error message block */
.error-message {
  font-size: 0.8rem;
  color: var(--danger);
  margin-top: 0.25rem;
  font-weight: 500;
  display: none;
  animation: slideDown 0.2s ease-out;
}

.error-message.show {
  display: block;
}

/* --- RESULTS SECTION --- */
.results-section {
  margin-top: 2rem;
  animation: fadeIn 0.4s ease-out;
}

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

.results-title {
  font-size: 1.25rem;
  color: var(--text-primary);
}

.btn-secondary {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  padding: 0.45rem 0.8rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

.btn-secondary svg {
  width: 0.9rem;
  height: 0.9rem;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.results-stack {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.result-card-item {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.result-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.result-badge-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.25rem 0.6rem;
  border-radius: 30px;
  letter-spacing: 0.05em;
}

.number-badges-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.number-badge {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  font-family: 'Outfit', monospace;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  transition: var(--transition-smooth);
  animation: popIn 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.2) both;
}

.number-badge:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-cyan);
}

/* --- FOOTER --- */
.app-footer {
  text-align: center;
  padding: 2.5rem 0 1rem 0;
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  font-size: 0.825rem;
  color: var(--text-muted);
}

.app-footer a:hover {
  color: var(--accent-cyan);
}

/* --- TOAST WIDGET --- */
.toast-container {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  pointer-events: none;
}

.toast {
  background: rgba(17, 24, 39, 0.9);
  border: 1px solid var(--accent-cyan);
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  color: #fff;
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5), 0 0 10px var(--accent-glow);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  backdrop-filter: blur(8px);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.3);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-icon {
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
}

.toast-icon svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
}

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

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}