/* ==========================================================================
   Antigravity PDF Splitter - Premium Styling & Glassmorphism Design
   ========================================================================== */

/* 1. Global Reset & Variables */
:root {
  --font-sans: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* HSL Tailored Theme Colors (Modern Obsidian/Indigo Scheme) */
  --bg-base: hsl(230 25% 6%);
  --bg-card: rgba(22, 22, 33, 0.65);
  --bg-card-hover: rgba(30, 30, 48, 0.8);
  --border-light: rgba(255, 255, 255, 0.08);
  --border-focus: hsla(250, 85%, 65%, 0.4);
  
  --color-text-primary: hsl(210 20% 98%);
  --color-text-secondary: hsl(215 15% 75%);
  --color-text-muted: hsl(215 10% 50%);
  
  /* Brand Gradients & Accents */
  --primary-glow: linear-gradient(135deg, hsl(250 85% 55%), hsl(275 85% 50%));
  --accent-color: hsl(175 80% 43%);
  --accent-color-hover: hsl(175 85% 38%);
  --error-color: hsl(0 84% 60%);
  --success-color: hsl(142 70% 45%);
  --info-color: hsl(200 80% 50%);
  
  /* UI Layouts */
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --shadow-premium: 0 10px 40px -10px rgba(0, 0, 0, 0.6), 0 1px 1px rgba(255, 255, 255, 0.05) inset;
  --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-micro: all 0.15s ease;
}

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

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

/* 2. Glow Background Decorations */
.background-decorations {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(140px);
  opacity: 0.22;
  mix-blend-mode: screen;
}

.orb-1 {
  top: -10%;
  left: 10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, hsl(250 85% 55%) 0%, transparent 70%);
  animation: floatOrb 25s infinite alternate ease-in-out;
}

.orb-2 {
  bottom: -10%;
  right: 10%;
  width: 45vw;
  height: 45vw;
  background: radial-gradient(circle, hsl(175 80% 43%) 0%, transparent 70%);
  animation: floatOrb 20s infinite alternate-reverse ease-in-out;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(6%, 8%) scale(1.1); }
}

/* 3. Main Dashboard Layout */
.app-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
  min-height: 100vh;
}

.app-header {
  text-align: left;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.header-logo-icon {
  width: 32px;
  height: 32px;
  color: hsl(175 80% 43%);
}

.app-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #fff 40%, hsl(215 15% 75%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

/* Dashboard Grid */
.app-dashboard {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 32px;
  align-items: start;
}

@media (max-width: 1100px) {
  .app-dashboard {
    grid-template-columns: 1fr;
  }
}

/* Premium Dashboard Card Base */
.dashboard-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-premium);
  transition: var(--transition-smooth);
}

.dashboard-card:hover {
  border-color: rgba(255, 255, 255, 0.12);
  background: var(--bg-card-hover);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.01em;
}

.dashboard-controls-panel {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.dashboard-results-panel {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* 4. Dropzone Component */
.dropzone {
  border: 2px dashed rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 36px 20px;
  text-align: center;
  transition: var(--transition-smooth);
  background: rgba(255, 255, 255, 0.01);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.dropzone.dragover {
  border-color: hsl(175 80% 43%);
  background: rgba(27, 230, 196, 0.05);
  transform: scale(1.02);
}

.dropzone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.upload-icon {
  width: 48px;
  height: 48px;
  color: var(--color-text-muted);
  transition: var(--transition-smooth);
}

.dropzone:hover .upload-icon {
  color: hsl(175 80% 43%);
  transform: translateY(-4px);
}

.dropzone-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

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

/* Loaded File Info Card (Inside Dropzone) */
.loaded-file-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-top: 10px;
  text-align: left;
  animation: fadeIn 0.3s ease;
}

.file-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.file-icon {
  width: 32px;
  height: 32px;
  color: hsl(0 84% 60%);
  flex-shrink: 0;
}

.file-details {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.file-name {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.file-badge {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-light);
  padding: 6px 12px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  align-self: flex-start;
  color: hsl(175 80% 43%);
}

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

/* 5. Buttons & Form Styling */
.btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition-micro);
  width: 100%;
}

.btn-primary {
  background: var(--primary-glow);
  color: white;
  box-shadow: 0 4px 15px rgba(114, 46, 209, 0.3);
}

.btn-primary:hover:not(:disabled) {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(114, 46, 209, 0.4);
}

.btn-primary:disabled {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-muted);
  box-shadow: none;
  cursor: not-allowed;
}

.btn-accent {
  background: var(--accent-color);
  color: hsl(230 25% 6%);
  box-shadow: 0 4px 15px rgba(27, 230, 196, 0.2);
}

.btn-accent:hover:not(:disabled) {
  background: var(--accent-color-hover);
  transform: translateY(-1px);
}

.btn-accent:disabled {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-muted);
  box-shadow: none;
  cursor: not-allowed;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-light);
  color: var(--color-text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
}

.btn-icon {
  width: 18px;
  height: 18px;
}

.actions-wrapper {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Form Settings Input */
.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-text-primary);
}

.input-helper {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.form-group input {
  width: 100%;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: white;
  transition: var(--transition-micro);
}

.form-group input:focus {
  outline: none;
  border-color: hsl(250 85% 65%);
  box-shadow: 0 0 0 3px rgba(114, 46, 209, 0.2);
}

/* 6. Real-Time Progress Bar Component */
.progress-details {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.progress-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.progress-percent {
  font-size: 0.95rem;
  font-weight: 700;
  color: hsl(175 80% 43%);
}

.progress-bar-container {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, hsl(250 85% 55%), hsl(175 80% 43%));
  border-radius: 50px;
  transition: width 0.15s ease-out;
  position: relative;
}

/* 7. Explorer Style Table */
.explorer-card {
  display: flex;
  flex-direction: column;
  max-height: 520px;
}

.explorer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.explorer-stats {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.explorer-stats strong {
  color: hsl(175 80% 43%);
  font-size: 0.9rem;
}

.explorer-table-container {
  flex-grow: 1;
  overflow-y: auto;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.15);
  scrollbar-gutter: stable;
}

/* Custom Scrollbar for Explorer Table */
.explorer-table-container::-webkit-scrollbar {
  width: 8px;
}

.explorer-table-container::-webkit-scrollbar-track {
  background: transparent;
}

.explorer-table-container::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

.explorer-table-container::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

.explorer-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

.explorer-table th, 
.explorer-table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.explorer-table th {
  background: rgba(18, 18, 24, 0.9);
  color: var(--color-text-secondary);
  font-weight: 600;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
}

.col-checkbox { width: 46px; text-align: center; }
.col-name { width: 50%; }
.col-type { width: 15%; }
.col-size { width: 15%; }
.col-action { width: 15%; text-align: right; }

.explorer-table tbody tr {
  transition: var(--transition-micro);
}

.explorer-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

/* Explorer File Rows */
.explorer-file-cell {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.pdf-icon-svg {
  width: 20px;
  height: 20px;
  color: hsl(0 84% 60%);
  flex-shrink: 0;
}

.explorer-filename-link {
  color: var(--color-text-primary);
  text-decoration: none;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: var(--transition-micro);
}

.explorer-filename-link:hover {
  color: hsl(175 80% 43%);
  text-decoration: underline;
}

.explorer-type-text {
  color: var(--color-text-muted);
}

.explorer-size-text {
  color: var(--color-text-secondary);
  font-family: monospace;
}

/* Action button inside row */
.btn-row-download {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: var(--transition-micro);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-row-download:hover {
  color: hsl(175 80% 43%);
  background: rgba(27, 230, 196, 0.08);
  transform: scale(1.1);
}

.btn-row-download svg {
  width: 18px;
  height: 18px;
}

/* Empty State Styling */
.empty-state {
  text-align: center;
  padding: 60px 20px !important;
  color: var(--color-text-muted);
}

.empty-icon {
  width: 48px;
  height: 48px;
  color: rgba(255, 255, 255, 0.06);
  margin-bottom: 12px;
}

.empty-state p {
  font-size: 0.8rem;
  max-width: 320px;
  margin: 0 auto;
  line-height: 1.5;
}

/* 8. Footer */
.app-footer {
  text-align: center;
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
}

.app-footer p {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Custom Checkbox Design */
.checkbox-container {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  font-size: 0.85rem;
  font-weight: 500;
}

.checkbox-container input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.3);
  cursor: pointer;
  position: relative;
  transition: var(--transition-micro);
  padding: 0;
  margin: 0;
  display: inline-block;
  flex-shrink: 0;
}

.checkbox-container input[type="checkbox"]:checked {
  background: var(--accent-color);
  border-color: var(--accent-color);
}

.checkbox-container input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 9px;
  border: solid hsl(230 25% 6%);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.checkbox-label {
  color: var(--color-text-primary);
  transition: var(--transition-micro);
}

.checkbox-container:hover input[type="checkbox"] {
  border-color: var(--accent-color);
}

/* Row checkbox cell centering */
.col-checkbox-cell {
  text-align: center;
  vertical-align: middle;
  padding: 14px 16px;
}

.row-checkbox-container {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 18px;
  height: 18px;
  margin: 0 auto;
  padding: 0;
}