/* ==========================================================================
   InvoiceFlow — Premium Core Design System
   Color Palette: #080A0F, #0E1118, #121722, #171C28
   Accents: Electric Blue (#2563EB), Cyan (#06B6D4), Violet (#7C3AED)
   ========================================================================== */

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

:root {
  /* Surface & Backgrounds */
  --bg-main: #080A0F;
  --bg-secondary: #0E1118;
  --card-bg: #121722;
  --card-elevated: #171C28;
  --card-hover: #1C2333;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(37, 99, 235, 0.5);
  --border-glow: rgba(99, 102, 241, 0.25);

  /* Accents & Gradients */
  --accent-primary: #2563EB;
  --accent-secondary: #7C3AED;
  --accent-cyan: #06B6D4;
  --accent-gradient: linear-gradient(135deg, #2563EB 0%, #7C3AED 100%);
  --accent-gradient-cyan: linear-gradient(135deg, #06B6D4 0%, #2563EB 100%);
  --accent-glow: 0 0 25px rgba(37, 99, 235, 0.35);
  --violet-glow: 0 0 25px rgba(124, 58, 237, 0.35);

  /* Status Colors */
  --emerald: #10B981;
  --emerald-bg: rgba(16, 185, 129, 0.12);
  --emerald-border: rgba(16, 185, 129, 0.3);
  --amber: #F59E0B;
  --amber-bg: rgba(245, 158, 11, 0.12);
  --amber-border: rgba(245, 158, 11, 0.3);
  --red: #EF4444;
  --red-bg: rgba(239, 68, 68, 0.12);
  --red-border: rgba(239, 68, 68, 0.3);
  --blue: #3B82F6;
  --blue-bg: rgba(59, 130, 246, 0.12);
  --blue-border: rgba(59, 130, 246, 0.3);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --text-main: #F5F7FA;
  --text-secondary: #CBD5E1;
  --text-muted: #8B95A7;
  --text-dim: #525C6E;

  /* Shadows & Glass */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 30px rgba(37, 99, 235, 0.2);
  --glass-bg: rgba(18, 23, 34, 0.75);
  --glass-backdrop: blur(16px);

  /* 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);

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
}

/* ==========================================================================
   Base Reset & Globals
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  background-color: var(--bg-main);
  color: var(--text-main);
  position: relative;
  overflow-x: hidden;
}

/* Subtle background grid pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* Glowing ambient blobs */
.ambient-glow-1 {
  position: fixed;
  top: -100px;
  left: 20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, rgba(37, 99, 235, 0) 70%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: floatSlow 18s ease-in-out infinite alternate;
}

.ambient-glow-2 {
  position: fixed;
  bottom: 5%;
  right: 15%;
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.12) 0%, rgba(124, 58, 237, 0) 70%);
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
  animation: floatSlow 22s ease-in-out infinite alternate-reverse;
}

@keyframes floatSlow {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.08); }
  100% { transform: translate(-20px, 30px) scale(0.95); }
}

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

img, svg {
  display: block;
  max-width: 100%;
}

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

/* ==========================================================================
   Typography Utilities
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, #FFFFFF 20%, #93C5FD 70%, #C4B5FD 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.925rem;
  transition: all var(--transition-normal);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  user-select: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(37, 99, 235, 0.55);
}

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

.btn-secondary {
  background: var(--card-elevated);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--card-hover);
  border-color: rgba(255, 255, 255, 0.18);
  transform: translateY(-2px);
  color: #FFFFFF;
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-focus);
  color: #FFFFFF;
}

.btn-success {
  background: var(--emerald-bg);
  color: var(--emerald);
  border: 1px solid var(--emerald-border);
}

.btn-success-solid {
  background: linear-gradient(135deg, #10B981, #059669) !important;
  color: #FFFFFF !important;
  border: 1px solid #10B981 !important;
  font-weight: 700 !important;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.btn-success-solid:hover {
  background: #059669 !important;
  color: #FFFFFF !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
}

.btn-warning-solid {
  background: #D97706 !important;
  color: #FFFFFF !important;
  border: 1px solid #D97706 !important;
  font-weight: 700 !important;
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.35);
}

.btn-warning-solid:hover {
  background: #B45309 !important;
  color: #FFFFFF !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(217, 119, 6, 0.5);
}

.btn-danger {
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid var(--red-border);
}

.btn-danger:hover {
  background: var(--red);
  color: #FFFFFF;
  box-shadow: 0 0 16px rgba(239, 68, 68, 0.4);
}

.btn-danger-solid {
  background: linear-gradient(135deg, #EF4444, #DC2626) !important;
  color: #FFFFFF !important;
  border: 1px solid #EF4444 !important;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.4);
}

.btn-danger-solid:hover {
  background: linear-gradient(135deg, #DC2626, #B91C1C) !important;
  color: #FFFFFF !important;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.6);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.825rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 12px 24px;
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

@keyframes btn-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.btn-spinner {
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(255, 255, 255, 0.3);
  border-top-color: #FFFFFF;
  border-radius: 50%;
  animation: btn-spin 0.75s linear infinite;
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
}

.btn-icon-only {
  padding: 8px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
}

.btn-icon-only:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.06);
}

/* ==========================================================================
   Badges & Pills
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.badge-pending {
  background: var(--amber-bg);
  color: var(--amber);
  border: 1px solid var(--amber-border);
}
.badge-pending .badge-dot {
  background: var(--amber);
  box-shadow: 0 0 8px var(--amber);
}

.badge-approved {
  background: var(--emerald-bg);
  color: var(--emerald);
  border: 1px solid var(--emerald-border);
}
.badge-approved .badge-dot {
  background: var(--emerald);
  box-shadow: 0 0 8px var(--emerald);
}

.badge-rejected {
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid var(--red-border);
}
.badge-rejected .badge-dot {
  background: var(--red);
  box-shadow: 0 0 8px var(--red);
}

.badge-primary {
  background: rgba(37, 99, 235, 0.15);
  color: #93C5FD;
  border: 1px solid rgba(37, 99, 235, 0.35);
}

.badge-optional {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.7rem;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  text-transform: none;
}

/* ==========================================================================
   Card Styles & Glass Containers
   ========================================================================== */

.card {
  background: var(--card-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition-normal);
  position: relative;
}

.card-elevated {
  background: var(--card-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.card-glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.card-interactive:hover {
  border-color: rgba(255, 255, 255, 0.16);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 0 25px rgba(37, 99, 235, 0.08);
}

/* ==========================================================================
   Forms & Inputs
   ========================================================================== */

.form-group {
  margin-bottom: 20px;
  position: relative;
}

.form-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background: var(--card-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-control:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.form-control:focus {
  background: #141A26;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.form-control::placeholder {
  color: var(--text-dim);
}

textarea.form-control {
  resize: vertical;
  min-height: 90px;
}

.input-prefix-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  font-weight: 600;
  pointer-events: none;
}

.input-prefix-wrapper .form-control {
  padding-left: 36px;
}

.input-icon-btn {
  position: absolute;
  right: 12px;
  color: var(--text-muted);
  cursor: pointer;
}

.input-icon-btn:hover {
  color: var(--text-main);
}

.form-error {
  color: var(--red);
  font-size: 0.8rem;
  margin-top: 5px;
  display: none;
}

.form-group.has-error .form-control {
  border-color: var(--red);
}

.form-group.has-error .form-error {
  display: block;
}

/* ==========================================================================
   Modals
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(4, 6, 11, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

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

.modal-dialog {
  background: var(--card-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  max-width: 560px;
  width: 100%;
  max-height: calc(100vh - 32px);
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 35px rgba(37, 99, 235, 0.15);
  transform: scale(0.94) translateY(10px);
  transition: transform var(--transition-normal);
  overflow: hidden;
  position: relative;
}

.modal-backdrop.active .modal-dialog {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-body {
  padding: 22px;
  overflow-y: auto;
  flex: 1;
  -webkit-overflow-scrolling: touch;
}

.modal-footer {
  padding: 16px 22px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  background: var(--bg-secondary);
  flex-shrink: 0;
  flex-wrap: wrap;
}

/* ==========================================================================
   Toast Notification System
   ========================================================================== */

#toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: calc(100vw - 32px);
  pointer-events: none;
}

@media (max-width: 480px) {
  #toast-container {
    top: 12px;
    right: 12px;
    left: 12px;
    max-width: calc(100vw - 24px);
  }
}

.toast {
  background: var(--card-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  transform: translateX(120%);
  opacity: 0;
  transition: all var(--transition-normal);
}

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

.toast-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  margin-top: 1px;
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 2px;
}

.toast-message {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.toast-close {
  color: var(--text-dim);
  cursor: pointer;
  padding: 2px;
}

.toast-close:hover {
  color: var(--text-main);
}

.toast.success {
  border-left: 3px solid var(--emerald);
}
.toast.success .toast-icon {
  color: var(--emerald);
}

.toast.warning {
  border-left: 3px solid var(--amber);
}
.toast.warning .toast-icon {
  color: var(--amber);
}

.toast.error {
  border-left: 3px solid var(--red);
}
.toast.error .toast-icon {
  color: var(--red);
}

.toast.info {
  border-left: 3px solid var(--blue);
}
.toast.info .toast-icon {
  color: var(--blue);
}

/* ==========================================================================
   Security & Enterprise Compliance Banner
   ========================================================================== */

.security-compliance-banner,
.prototype-disclaimer {
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  font-size: 0.78rem;
  color: #93C5FD;
  display: flex;
  align-items: center;
  gap: 10px;
  line-height: 1.45;
}

.security-compliance-banner svg,
.prototype-disclaimer svg {
  flex-shrink: 0;
  color: #60A5FA;
}

.form-actions-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
}

/* ==========================================================================
   Custom Scrollbars
   ========================================================================== */

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Accessibility: reduce motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}