:root {
  --bg-primary: #0a0f1d;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(31, 41, 55, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(56, 189, 248, 0.3);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-sky: #38bdf8;
  --accent-purple: #8b5cf6;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  --accent-amber: #f59e0b;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.25);
}

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

body {
  font-family: var(--font-family);
  background: radial-gradient(circle at 50% 0%, #172554 0%, var(--bg-primary) 70%);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-card);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
}

.brand-icon svg {
  width: 26px;
  height: 26px;
  stroke: white;
}

.brand-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, #ffffff, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 12px;
  color: var(--accent-sky);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.user-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-green);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  text-decoration: none;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-sky));
  color: white;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-turbo {
  background: linear-gradient(135deg, #0284c7, #06b6d4);
  color: white;
  box-shadow: 0 4px 14px rgba(6, 182, 212, 0.35);
}

.btn-turbo:hover {
  filter: brightness(1.15);
  box-shadow: 0 4px 20px rgba(6, 182, 212, 0.5);
  transform: translateY(-1px);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-main);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: var(--accent-red);
  color: white;
}

/* Storage & Stats Banner */
.stats-banner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-val {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
}

.stat-sub {
  font-size: 12px;
  color: var(--accent-sky);
}

/* Transfer Controls / Settings */
.controls-bar {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.controls-group {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.control-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
}

.control-item label {
  font-weight: 600;
  color: var(--text-main);
}

.select-custom {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  outline: none;
  cursor: pointer;
  transition: border-color 0.2s;
}

.select-custom:focus {
  border-color: var(--accent-sky);
}

.select-custom option {
  background: var(--bg-secondary);
  color: var(--text-main);
}

/* Upload Drop Zone */
.dropzone {
  border: 2px dashed rgba(56, 189, 248, 0.35);
  background: rgba(17, 24, 39, 0.6);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 40px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s ease;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent-sky);
  background: rgba(14, 165, 233, 0.1);
  box-shadow: 0 0 30px rgba(56, 189, 248, 0.25);
  transform: translateY(-2px);
}

.dropzone-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: rgba(56, 189, 248, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-sky);
}

.dropzone-icon svg {
  width: 34px;
  height: 34px;
  stroke: var(--accent-sky);
}

.dropzone-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-main);
}

.dropzone-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto 16px;
}

.file-input {
  display: none;
}

/* Active Transfers Section */
.transfers-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.transfer-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s;
}

.transfer-card.active {
  border-color: var(--accent-sky);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
}

.transfer-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
  gap: 12px;
}

.transfer-file-info {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.transfer-badge-type {
  font-size: 11px;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

.transfer-badge-type.upload {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
}

.transfer-badge-type.download {
  background: rgba(6, 182, 212, 0.2);
  color: #22d3ee;
}

.transfer-name {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 450px;
}

.transfer-meta {
  font-size: 12px;
  color: var(--text-muted);
}

.transfer-speed-box {
  text-align: right;
  flex-shrink: 0;
}

.speed-metric {
  font-size: 18px;
  font-weight: 800;
  color: var(--accent-sky);
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: flex-end;
}

.speed-sub {
  font-size: 12px;
  color: var(--text-muted);
}

/* Progress bar */
.progress-track {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 12px;
  position: relative;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #0284c7, #06b6d4, #38bdf8);
  border-radius: var(--radius-full);
  transition: width 0.15s ease-out;
  position: relative;
}

.progress-fill.active::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.4) 50%,
    rgba(255, 255, 255, 0) 100%
  );
  animation: shine 1.2s infinite;
}

@keyframes shine {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Chunk visualizer grid */
.chunk-map {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  padding: 8px;
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-sm);
  max-height: 80px;
  overflow-y: auto;
  margin-top: 10px;
}

.chunk-block {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.08);
  transition: background-color 0.15s;
}

.chunk-block.active {
  background: var(--accent-sky);
  box-shadow: 0 0 6px var(--accent-sky);
  animation: pulse 0.8s infinite alternate;
}

.chunk-block.done {
  background: var(--accent-green);
}

@keyframes pulse {
  0% { opacity: 0.6; }
  100% { opacity: 1; }
}

/* Files Table */
.files-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.files-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.files-title {
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.files-count-badge {
  font-size: 12px;
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  color: var(--text-muted);
}

.search-input {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  width: 220px;
  outline: none;
}

.search-input:focus {
  border-color: var(--accent-sky);
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.files-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.files-table th {
  padding: 12px 20px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.15);
}

.files-table td {
  padding: 14px 20px;
  font-size: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

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

.file-name-cell {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
}

.file-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-sky);
  flex-shrink: 0;
}

.file-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: flex-end;
}

.empty-state {
  padding: 60px 20px;
  text-align: center;
  color: var(--text-dim);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  stroke: var(--text-dim);
  margin-bottom: 12px;
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  max-width: 550px;
  width: 100%;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
  position: relative;
}

.modal-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.modal-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 16px;
}

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

.form-input {
  width: 100%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  outline: none;
}

.form-input:focus {
  border-color: var(--accent-sky);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 24px;
}

.code-box {
  background: #090d16;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-family: Consolas, Monaco, monospace;
  font-size: 12px;
  color: #38bdf8;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin-bottom: 12px;
}

.copy-btn {
  font-size: 11px;
  float: right;
  margin-top: -4px;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 2000;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.6);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn 0.25s ease;
}

.toast.success {
  border-left: 4px solid var(--accent-green);
}

.toast.error {
  border-left: 4px solid var(--accent-red);
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Breadcrumbs Navigation */
.breadcrumbs-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 12px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 14px;
}

.breadcrumb-link {
  color: var(--accent-sky);
  text-decoration: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}

.breadcrumb-link:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--text-dim);
  font-size: 12px;
}

.breadcrumb-current {
  color: var(--text-main);
  font-weight: 600;
}

.folder-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: rgba(245, 158, 11, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fbbf24;
  flex-shrink: 0;
}

.folder-row {
  cursor: pointer;
}

.folder-row:hover td {
  background: rgba(245, 158, 11, 0.05) !important;
}

.folder-row .file-name-cell span {
  color: #fde68a;
  font-weight: 600;
}

@media (max-width: 768px) {
  .header {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }
  .header-right {
    justify-content: space-between;
  }
  .controls-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .controls-group {
    justify-content: space-between;
  }
}