:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #38bdf8;
  --accent-hover: #0ea5e9;
  --accent-glow: rgba(56, 189, 248, 0.15);
  --border: #334155;
  --danger: #ef4444;
  --success: #10b981;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  overflow: hidden;
}

/* Authentication Page */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100vw;
  height: 100vh;
  background: radial-gradient(circle at 50% 20%, #1e293b 0%, #0f172a 80%);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: rgba(30, 41, 59, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  border-radius: 14px;
  margin-bottom: 1rem;
  box-shadow: 0 8px 16px var(--accent-glow);
}

.auth-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.auth-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 0.35rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: #0f172a;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: all 0.2s ease;
}

.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.btn-primary {
  width: 100%;
  padding: 0.85rem;
  background: var(--accent);
  color: #0f172a;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-primary:active {
  transform: scale(0.99);
}

.auth-footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 1.25rem;
  line-height: 1.5;
}

/* Main Dashboard Layout */
.app-container {
  display: flex;
  width: 100vw;
  height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 270px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  border-bottom: 1px solid var(--border);
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-text h1 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-text span {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-nav {
  padding: 1.25rem 0.75rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.15s ease;
  cursor: pointer;
}

.nav-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.nav-item.active {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  font-weight: 600;
}

.sidebar-quota {
  padding: 1.25rem;
  border-top: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.4);
}

.quota-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.progress-track {
  width: 100%;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #38bdf8, #818cf8);
  border-radius: 999px;
}

.quota-meta {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Main Content Area */
.main-wrapper {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  overflow: hidden;
}

.topbar {
  height: 65px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background: var(--bg-secondary);
}

.search-box {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.85rem;
  width: 320px;
}

.search-box input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.875rem;
  width: 100%;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  transition: all 0.15s ease;
}

.btn-action:hover {
  background: #475569;
}

.btn-action.accent {
  background: var(--accent);
  color: #0f172a;
  border: none;
}

.btn-action.accent:hover {
  background: var(--accent-hover);
}

.btn-benchmark {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border-color: rgba(16, 185, 129, 0.3);
}

.btn-benchmark:hover {
  background: rgba(16, 185, 129, 0.25);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-left: 1rem;
  border-left: 1px solid var(--border);
}

.avatar {
  width: 34px;
  height: 34px;
  background: #6366f1;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

/* Content view */
.content-body {
  flex-grow: 1;
  padding: 2rem;
  overflow-y: auto;
  position: relative;
}

.content-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.breadcrumbs span.current {
  color: var(--text-primary);
  font-weight: 600;
}

.view-controls {
  display: flex;
  gap: 0.5rem;
}

.icon-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.45rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.icon-btn:hover, .icon-btn.active {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

/* File Table */
.file-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.file-table th {
  padding: 0.75rem 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.file-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid rgba(51, 65, 85, 0.4);
  font-size: 0.9rem;
  color: var(--text-secondary);
  vertical-align: middle;
}

.file-row:hover td {
  background: rgba(30, 41, 59, 0.6);
  color: var(--text-primary);
}

.file-name-cell {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--text-primary);
  font-weight: 500;
  cursor: pointer;
}

.file-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.file-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  justify-content: flex-end;
}

.action-link {
  color: var(--text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.3rem;
  border-radius: 4px;
}

.action-link:hover {
  color: var(--accent);
  background: var(--bg-tertiary);
}

.action-link.delete:hover {
  color: var(--danger);
}

/* Upload Dropzone Overlay */
.dropzone-overlay {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(4px);
  border: 2px dashed var(--accent);
  border-radius: var(--radius-md);
  z-index: 50;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.dropzone-overlay.active {
  display: flex;
}

/* Transfer Toast / Modal */
.transfer-panel {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 360px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.6);
  z-index: 100;
  display: none;
  overflow: hidden;
}

.transfer-header {
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 600;
}

.transfer-body {
  padding: 1rem;
}

.transfer-file-title {
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.transfer-stats {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

/* Notification banner */
.alert-banner {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  margin-bottom: 1rem;
  display: none;
}

.alert-banner.error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  display: block;
}

.alert-banner.success {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
  display: block;
}