:root {
  /* Premium Dynamic Theme - Light by Default */
  --bg-color: #f0f4f8;
  --text-main: #0f172a;
  --text-muted: #475569;
  --surface: rgba(255, 255, 255, 0.75);
  --surface-border: rgba(148, 163, 184, 0.25);
  --surface-hover: rgba(255, 255, 255, 0.95);
  
  --accent: #0f766e;
  --accent-hover: #115e59;
  --accent-glow: rgba(15, 118, 110, 0.25);
  --accent-secondary: #6d28d9;
  
  --danger: #ef4444;
  --danger-hover: #dc2626;

  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-family: 'Outfit', system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --surface: rgba(30, 41, 59, 0.65);
    --surface-border: rgba(255, 255, 255, 0.08);
    --surface-hover: rgba(51, 65, 85, 0.85);
    
    --accent: #14b8a6;
    --accent-hover: #0d9488;
    --accent-glow: rgba(20, 184, 166, 0.4);
    --accent-secondary: #8b5cf6;
    
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  }
}

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

body {
  font-family: var(--font-family);
  color: var(--text-main);
  background-color: var(--bg-color);
  background-image: 
    radial-gradient(circle at 0% 0%, rgba(20, 184, 166, 0.15), transparent 40%),
    radial-gradient(circle at 100% 100%, rgba(139, 92, 246, 0.15), transparent 40%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 40px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 16px;
  z-index: 1000;
  background: var(--accent);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-lg);
  transition: left var(--transition);
  touch-action: manipulation;
}

.skip-link:focus {
  left: 16px;
}

.app-header {
  max-width: 1200px;
  margin: 32px auto 24px;
  padding: 0 24px;
  display: flex;
  gap: 16px;
  align-items: center;
  animation: slideDown 0.6s ease-out backwards;
}

.app-header img {
  border-radius: var(--radius-md);
  box-shadow: 0 0 15px var(--accent-glow);
  transition: transform var(--transition);
}

.app-header img:hover {
  transform: rotate(-10deg) scale(1.1);
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-main), var(--text-muted));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  margin-bottom: 4px;
}

h2 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-main);
}

p {
  color: var(--text-muted);
}

.app-header p {
  font-size: 1.05rem;
  font-weight: 400;
}

.chip {
  margin-left: auto;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--accent);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
  animation: fadeIn 0.8s ease-out backwards;
}

/* Main Layout */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  gap: 24px;
}

/* Glassmorphism Panels */
.panel {
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 4vw, 32px);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  animation: slideUp 0.6s ease-out backwards;
}

.panel:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Badge styling */

.hero-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: white;
  margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.2);
}

.expandable-panel summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  outline: none;
}
.expandable-panel summary::-webkit-details-marker {
  display: none;
}
.expandable-panel summary h2 {
  margin-bottom: 0;
}
.expandable-panel summary .chevron {
  display: block;
  width: 10px;
  height: 10px;
  border-right: 3px solid var(--accent);
  border-bottom: 3px solid var(--accent);
  transform: rotate(45deg);
  transition: transform var(--transition);
  margin-right: 8px;
}
.expandable-panel[open] summary .chevron {
  transform: rotate(225deg);
  margin-top: 4px;
}
.expandable-panel .panel-content {
  margin-top: 20px;
  border-top: 1px solid var(--surface-border);
  padding-top: 20px;
  animation: fadeIn 0.4s ease-out;
}

/* Stagger Animations */
.panel:nth-child(1) { animation-delay: 0.1s; }
.panel:nth-child(2) { animation-delay: 0.2s; }
.panel:nth-child(3) { animation-delay: 0.3s; }
.panel:nth-child(4) { animation-delay: 0.4s; }
.panel:nth-child(5) { animation-delay: 0.5s; }
.panel:nth-child(6) { animation-delay: 0.6s; }
.panel:nth-child(7) { animation-delay: 0.7s; }

.panel-lead {
  font-size: 1.05rem;
  margin-bottom: 20px;
}

.inline-help {
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.guide-list {
  padding-left: 24px;
  display: grid;
  gap: 12px;
}

.guide-list li {
  color: var(--text-main);
  font-weight: 500;
}

.guide-list li::marker {
  color: var(--accent);
  font-weight: 700;
}

/* Grid Layouts */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.split-three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* Form Controls */
label {
  display: block;
  font-weight: 600;
  margin: 16px 0 6px;
  color: var(--text-main);
}

input,
textarea,
select,
button {
  font-family: inherit;
  font-size: 1rem;
}

button,
a,
summary,
input,
textarea,
select {
  touch-action: manipulation;
}

input,
textarea,
select {
  width: 100%;
  background: var(--surface);
  color: var(--text-main);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  transition: all var(--transition);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.5;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: var(--surface-hover);
}

/* Buttons */
.row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: end;
}

.actions {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

button {
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: #fff;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition);
  box-shadow: 0 4px 12px var(--accent-glow);
  position: relative;
  overflow: hidden;
}

button::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
  transition: left 0.5s ease;
}

button:hover::after {
  left: 100%;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--accent-glow);
}

button:active {
  transform: translateY(0);
}

button.secondary {
  background: var(--surface);
  color: var(--text-main);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-sm);
}

button.secondary:hover {
  background: var(--surface-hover);
  border-color: var(--text-muted);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Lists */
.item-list {
  margin-top: 16px;
  padding-left: 0;
  list-style: none;
  max-height: 200px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  scroll-padding: 8px;
}

.item-list li {
  background: var(--surface-border);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  border-left: 4px solid var(--accent);
  animation: slideIn 0.3s ease-out backwards;
}

/* Status Elements */
.status {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--accent);
  min-height: 1.5em;
  font-weight: 500;
}

.global-status {
  text-align: center;
  font-size: 1rem;
  padding: 12px;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--surface-border);
  margin-top: 24px;
}

.global-status:empty {
  display: none;
}

.import-row {
  margin-top: 16px;
}

.print-brief {
  display: none;
  padding: 40px;
  background: #fff;
  color: #000;
  border-radius: var(--radius-md);
}

.print-brief h2,
.print-brief h3 {
  margin-top: 20px;
  color: #000;
}

.print-brief ul {
  padding-left: 20px;
}

footer {
  max-width: 1200px;
  margin: 40px auto 20px;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-10px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.4);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(148, 163, 184, 0.6);
}

/* Responsive */
@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;
  }
}

@media (max-width: 992px) {
  .split, .split-three {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .app-header {
    flex-wrap: wrap;
    margin-top: 16px;
    padding: 0 16px;
  }
  
  .chip {
    margin-left: 0;
    margin-top: 8px;
  }
  
  main {
    padding: 0 16px;
    gap: 16px;
  }
  
  .panel {
    padding: 24px 16px;
  }
  
  .row {
    grid-template-columns: 1fr;
    display: grid;
  }
  
  .actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  button {
    width: 100%;
    justify-content: center;
  }
  
  footer {
    padding: 0 16px;
  }
}

@media print {
  body {
    background: #fff !important;
    color: #000 !important;
    padding: 0 !important;
  }
  
  .app-header, .panel, .global-status, footer, .skip-link {
    display: none !important;
  }
  
  main {
    display: block;
    max-width: none;
    padding: 0;
    margin: 0;
  }
  
  .print-brief {
    display: block;
    padding: 0;
    border: none;
    box-shadow: none;
  }
}