:root {
  /* Theme Variables - Dark (Default) */
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --sidebar-bg: #020617;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --primary: #38bdf8;
  --primary-hover: #0ea5e9;
  --accent: #818cf8;
  --success: #10b981;
  --danger: #ef4444;
  --border: #334155;

  /* Layout Variables */
  --sidebar-width: 260px;
  --transition-speed: 0.3s;
}

[data-theme="light"] {
  --bg-color: #f1f5f9;
  --card-bg: #ffffff;
  --sidebar-bg: #f8fafc;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --primary: #0ea5e9;
  --primary-hover: #0284c7;
  --accent: #6366f1;
  --border: #cbd5e1;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family:
    "Inter",
    -apple-system,
    sans-serif;
}

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

.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 24px;
  position: fixed;
  height: 100vh;
  transition: width var(--transition-speed), padding var(--transition-speed);
  z-index: 1000;
}

.sidebar.collapsed {
  --sidebar-width: 80px;
  padding: 24px 16px;
}


.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 48px;
}

.logo h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 1px;
  white-space: nowrap;
  overflow: hidden;
  transition: opacity var(--transition-speed);
}

.sidebar.collapsed .logo h1 {
  opacity: 0;
  width: 0;
}

.sidebar.collapsed .logo {
  justify-content: center;
}


nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-grow: 1;
}

nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  text-decoration: none;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: all 0.2s;
  white-space: nowrap;
}

.sidebar.collapsed nav a {
  padding: 12px;
  justify-content: center;
}

.sidebar.collapsed nav a span:not(.icon) {
  display: none;
}

nav a:hover,
nav a.active {
  background-color: var(--card-bg);
  color: var(--primary);
}


.sidebar-footer {
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* Content */
.sidebar.collapsed + .content {
    margin-left: 80px;
}

.content {
  margin-left: var(--sidebar-width);
  flex-grow: 1;
  padding: 40px;
  max-width: 1400px;
  transition: margin-left var(--transition-speed);
}


header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 40px;
}

.header-info h2 {
  font-size: 1.8rem;
  margin-bottom: 4px;
}

.header-info p {
  color: var(--text-secondary);
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--success);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

.dot {
  width: 8px;
  height: 8px;
  background-color: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--success);
  animation: pulse 2s infinite;
}

/* Cards */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.metric-card h3 {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.drift-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
}

.charts-area {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
  gap: 32px;
}

.chart-card h3 {
  margin-bottom: 24px;
}

.canvas-container {
  position: relative;
  height: 350px;
}

/* Buttons */
.btn-primary {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

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

.btn-secondary {
  background-color: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 10px 20px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background-color: var(--border);
}

.btn-sync {
  width: 100%;
  background: linear-gradient(135deg, var(--accent), var(--primary));
  color: white;
  border: none;
  padding: 12px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform 0.2s;
}

.btn-sync:hover {
  transform: translateY(-2px);
}

.sidebar.collapsed .btn-sync {
  padding: 12px 0;
}

.sidebar.collapsed .btn-sync span:not(.icon) {
  display: none;
}

/* Toggle Buttons */
.toggle-sidebar-btn {
  position: absolute;
  top: 24px;
  right: -12px;
  width: 24px;
  height: 24px;
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  z-index: 1001;
  transition: transform var(--transition-speed);
}

.sidebar.collapsed .toggle-sidebar-btn {
  transform: rotate(180deg);
}

.theme-toggle-container {
  margin-top: 16px;
  display: flex;
  justify-content: center;
}

.btn-theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  justify-content: center;
  transition: all 0.2s;
}

.sidebar.collapsed .btn-theme-toggle span:not(.icon) {
  display: none;
}

.btn-theme-toggle:hover {
  background-color: var(--card-bg);
}


/* Upload Section */
.upload-card {
  border: 2px dashed var(--border);
  text-align: center;
  padding: 60px;
  transition: all 0.3s;
}

.upload-card.drag-over {
  border-color: var(--primary);
  background-color: rgba(56, 189, 248, 0.05);
}

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

.upload-icon {
  font-size: 3rem;
}

/* Results Table */
.results-card {
  margin-top: 32px;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  text-align: left;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  font-weight: 600;
}

td {
  padding: 12px;
  border-bottom: 1px solid var(--border);
}

tr:last-child td {
  border-bottom: none;
}

@keyframes pulse {
  0% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
  100% {
    opacity: 1;
  }
}