@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ==========================================================
   DESIGN TOKENS - LIGHT & DARK THEMES (Linear / Stripe inspired)
   ========================================================== */
:root {
  /* Font Family */
  --font-sans: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  /* Colors - Default Dark Mode (Deep Slate & Vibrant Violet/Indigo) */
  --bg-app: #080c14;
  --bg-surface: #0f1623;
  --bg-surface-elevated: #162032;
  --bg-surface-hover: #1e2b42;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-default: rgba(255, 255, 255, 0.14);
  --border-focus: #6366f1;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-disabled: #475569;

  /* Brand Accents */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-surface: rgba(99, 102, 241, 0.12);
  --primary-border: rgba(99, 102, 241, 0.35);

  --accent-cyan: #06b6d4;
  --accent-cyan-surface: rgba(6, 182, 212, 0.12);
  --accent-purple: #a855f7;
  --accent-purple-surface: rgba(168, 85, 247, 0.12);

  /* Functional Status Colors */
  --success: #10b981;
  --success-surface: rgba(16, 185, 129, 0.12);
  --success-border: rgba(16, 185, 129, 0.3);
  --warning: #f59e0b;
  --warning-surface: rgba(245, 158, 11, 0.12);
  --warning-border: rgba(245, 158, 11, 0.3);
  --danger: #ef4444;
  --danger-surface: rgba(239, 68, 68, 0.12);
  --danger-border: rgba(239, 68, 68, 0.3);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 28px -4px rgba(0, 0, 0, 0.5), 0 4px 8px -2px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 24px -2px rgba(99, 102, 241, 0.35);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --radius-full: 9999px;
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --bg-surface-hover: #e2e8f0;
  --border-subtle: #e2e8f0;
  --border-default: #cbd5e1;
  --border-focus: #4f46e5;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  --text-disabled: #94a3b8;

  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-surface: rgba(79, 70, 229, 0.08);
  --primary-border: rgba(79, 70, 229, 0.25);

  --accent-cyan: #0891b2;
  --accent-cyan-surface: rgba(8, 145, 178, 0.08);
  --accent-purple: #9333ea;
  --accent-purple-surface: rgba(147, 51, 234, 0.08);

  --success: #059669;
  --success-surface: rgba(5, 150, 105, 0.08);
  --success-border: rgba(5, 150, 105, 0.25);
  --warning: #d97706;
  --warning-surface: rgba(217, 119, 6, 0.08);
  --warning-border: rgba(217, 119, 6, 0.25);
  --danger: #dc2626;
  --danger-surface: rgba(220, 38, 38, 0.08);
  --danger-border: rgba(220, 38, 38, 0.25);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 20px -2px rgba(79, 70, 229, 0.2);
}

/* ==========================================================
   BASE & TYPOGRAPHY
   ========================================================== */
* {
  box-sizing: border-box;
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-app);
  color: var(--text-primary);
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.6;
  transition: background-color 0.25s ease, color 0.25s ease;
}

code, .font-mono {
  font-family: var(--font-mono);
}

/* ==========================================================
   COMPONENTS DESIGN SYSTEM
   ========================================================== */

/* Glass / Card Container */
.app-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.app-card-elevated {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.app-card:hover {
  border-color: var(--border-default);
}

/* Stepper Component */
.stepper-item {
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}

.stepper-circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  transition: all 0.3s ease;
}

.stepper-circle.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 0 0 4px var(--primary-surface), var(--shadow-glow);
}

.stepper-circle.completed {
  background: var(--success);
  color: #ffffff;
}

.stepper-circle.inactive {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-tertiary);
}

.stepper-line {
  height: 2px;
  flex: 1;
  background: var(--border-subtle);
  transition: background 0.3s ease;
}

.stepper-line.completed {
  background: var(--success);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  white-space: nowrap;
}

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

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.45);
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-default);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.btn-danger {
  background: var(--danger-surface);
  color: var(--danger);
  border-color: var(--danger-border);
}

.btn-danger:hover {
  background: var(--danger);
  color: #ffffff;
}

/* Form Controls & Inputs */
.form-input {
  width: 100%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  color: var(--text-primary);
  font-size: 14px;
  transition: all 0.15s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--primary-surface);
}

.form-input::placeholder {
  color: var(--text-tertiary);
}

.form-input.is-invalid {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px var(--danger-surface);
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
}

.badge-success {
  background: var(--success-surface);
  color: var(--success);
  border: 1px solid var(--success-border);
}

.badge-warning {
  background: var(--warning-surface);
  color: var(--warning);
  border: 1px solid var(--warning-border);
}

.badge-danger {
  background: var(--danger-surface);
  color: var(--danger);
  border: 1px solid var(--danger-border);
}

.badge-primary {
  background: var(--primary-surface);
  color: var(--primary);
  border: 1px solid var(--primary-border);
}

.badge-neutral {
  background: var(--bg-surface-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

/* Segmented Control (Tabs) */
.segmented-control {
  display: flex;
  background: var(--bg-surface-elevated);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.segmented-btn {
  flex: 1;
  text-align: center;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  border: none;
  background: transparent;
}

.segmented-btn.active {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

/* Tooltip Custom Helper */
.tooltip-trigger {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: help;
}

.tooltip-trigger:hover .tooltip-content {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.tooltip-content {
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  line-height: 1.4;
  white-space: nowrap;
  box-shadow: var(--shadow-md);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: all 0.15s ease;
  z-index: 100;
}

/* Drawer / Slide-over */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
}

.drawer-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.drawer-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 520px;
  background: var(--bg-surface);
  border-left: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-lg);
  z-index: 999;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.drawer-backdrop.open .drawer-panel {
  transform: translateX(0);
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 480px;
  transform: scale(0.96);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}

.modal-backdrop.open .modal-content {
  transform: scale(1);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 0.9; }
}

.pulse-glow {
  animation: pulseGlow 3s infinite ease-in-out;
}