:root {
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --bg-dark: #0f172a;
  --glass-bg: rgba(30, 41, 59, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --error: #ef4444;
  --success: #22c55e;
}

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

body {
  background: var(--bg-dark);
  background-image: 
    radial-gradient(at 0% 0%, rgba(79, 70, 229, 0.3) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(236, 72, 153, 0.15) 0px, transparent 50%);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

/* --- Login Page --- */
.login-container {
  width: 100%;
  max-width: 420px;
  padding: 40px;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: fadeIn 0.6s ease-out;
}

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

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-header h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.login-header p {
  color: var(--text-muted);
  font-size: 14px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input {
  width: 100%;
  padding: 14px 16px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: white;
  font-size: 15px;
  outline: none;
  transition: all 0.3s ease;
}

.form-group input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.15);
}

.btn-primary {
  width: 100%;
  padding: 14px;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-top: 10px;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -10px var(--primary-color);
}

.error-message {
  color: var(--error);
  font-size: 14px;
  text-align: center;
  margin-bottom: 16px;
  min-height: 20px;
  opacity: 0;
  transition: opacity 0.3s;
}

.error-message.show {
  opacity: 1;
}

/* --- Dashboard Page --- */
.dashboard-layout {
  display: flex;
  width: 100%;
  height: 100vh;
}

.sidebar {
  width: 280px;
  background: var(--glass-bg);
  border-right: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
}

.sidebar-brand {
  padding: 24px;
  font-size: 24px;
  font-weight: 700;
  border-bottom: 1px solid var(--glass-border);
  background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar-menu {
  padding: 20px 12px;
  flex: 1;
}

.menu-item {
  display: flex;
  align-items: center;
  padding: 14px 20px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 12px;
  margin-bottom: 8px;
  transition: all 0.2s ease;
  font-weight: 500;
  cursor: pointer;
}

.menu-item:hover, .menu-item.active {
  background: rgba(79, 70, 229, 0.15);
  color: var(--primary-color);
}

.menu-item i {
  margin-right: 12px;
  font-size: 20px;
}

.sidebar-footer {
  padding: 20px;
  border-top: 1px solid var(--glass-border);
}

.user-info {
  display: flex;
  align-items: center;
  margin-bottom: 16px;
}

.user-info .avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary-color);
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: bold;
  margin-right: 12px;
}

.user-info .details p {
  font-size: 14px;
  font-weight: 600;
}

.user-info .details span {
  font-size: 12px;
  color: var(--text-muted);
}

.btn-logout {
  width: 100%;
  padding: 10px;
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 500;
}

.btn-logout:hover {
  background: rgba(239, 68, 68, 0.2);
}

.main-content {
  flex: 1;
  padding: 40px;
  overflow-y: auto;
}

.content-header {
  margin-bottom: 32px;
}

.content-header h2 {
  font-size: 28px;
  font-weight: 700;
}

.card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 24px;
  backdrop-filter: blur(12px);
}

.tab-pane {
  display: none;
  animation: fadeIn 0.4s ease-out;
}

.tab-pane.active {
  display: block;
}

/* --- Overview Grid --- */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.stat-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 24px;
  backdrop-filter: blur(12px);
  transition: transform 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-5px);
}

.stat-card h3 {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 12px;
}

.stat-card .stat-number {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-card .stat-trend {
  font-size: 13px;
  display: inline-flex;
  align-items: center;
}

.stat-card .stat-trend.positive {
  color: var(--success);
}

/* Loader */
.loader {
  border: 3px solid rgba(255,255,255,0.1);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
  display: none;
  margin: 0 auto;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* --- Tables --- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

.data-table th, .data-table td {
  padding: 16px;
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
}

.data-table th {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 14px;
  text-transform: uppercase;
}

.data-table td {
  font-size: 15px;
}

.data-table tr:hover td {
  background: rgba(255, 255, 255, 0.05);
}

.btn-action {
  padding: 6px 12px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  margin-right: 8px;
}

.btn-edit { background: rgba(79, 70, 229, 0.2); color: #818cf8; }
.btn-delete { background: rgba(239, 68, 68, 0.2); color: #f87171; }

/* --- Modals --- */
.modal {
  display: none; 
  position: fixed; 
  z-index: 1000; 
  left: 0;
  top: 0;
  width: 100%; 
  height: 100%; 
  overflow: auto; 
  background-color: rgba(0,0,0,0.6); 
  backdrop-filter: blur(5px);
}

.modal-content {
  background: var(--bg-dark);
  margin: 5% auto; 
  padding: 30px;
  border: 1px solid var(--glass-border);
  width: 90%;
  max-width: 500px;
  border-radius: 20px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: fadeIn 0.3s ease-out;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 16px;
}

.modal-header h3 {
  font-size: 20px;
  font-weight: 600;
}

.close {
  color: var(--text-muted);
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}

.close:hover {
  color: white;
}