/* ===== CSS Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #C62828;
  --primary-light: #EF5350;
  --primary-dark: #8E0000;
  --primary-bg: rgba(198, 40, 40, 0.06);
  --bg: #FAFAFA;
  --surface: #FFFFFF;
  --surface-hover: #F5F5F5;
  --border: #E0E0E0;
  --border-light: #EEEEEE;
  --text-primary: #212121;
  --text-secondary: #616161;
  --text-muted: #9E9E9E;
  --success: #2E7D32;
  --success-bg: rgba(46, 125, 50, 0.08);
  --error: #C62828;
  --error-bg: rgba(198, 40, 40, 0.08);
  --warning: #F57F17;
  --warning-bg: rgba(245, 127, 23, 0.08);
  --info: #1565C0;
  --info-bg: rgba(21, 101, 192, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--primary-dark);
}

/* ===== Auth Layout ===== */
.auth-layout {
  display: flex;
  min-height: 100vh;
}

.auth-left {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 3rem;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  position: relative;
  overflow: hidden;
}

.auth-left::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(198, 40, 40, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(198, 40, 40, 0.1) 0%, transparent 40%);
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(2%, -2%) rotate(1deg); }
  66% { transform: translate(-1%, 1%) rotate(-1deg); }
}

.auth-left-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 480px;
}

.auth-left-content .logo-large {
  width: 120px;
  height: auto;
  margin-bottom: 2rem;
  filter: drop-shadow(0 4px 20px rgba(198, 40, 40, 0.4));
}

.auth-left-content h1 {
  color: #FFFFFF;
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.auth-left-content p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.1rem;
  line-height: 1.7;
}

.auth-right {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 3rem;
  background: var(--bg);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  padding: 2.5rem;
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
}

.auth-card .logo-small {
  width: 48px;
  height: auto;
  margin-bottom: 1.5rem;
}

.auth-card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.auth-card .subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

/* ===== Form Elements ===== */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.form-group label .required {
  color: var(--error);
  margin-left: 2px;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-family: var(--font);
  color: var(--text-primary);
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  outline: none;
}

.form-input::placeholder {
  color: var(--text-muted);
}

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

.form-input.error {
  border-color: var(--error);
  box-shadow: 0 0 0 3px var(--error-bg);
}

.form-input.success {
  border-color: var(--success);
  box-shadow: 0 0 0 3px var(--success-bg);
}

.password-wrapper {
  position: relative;
}

.password-wrapper .form-input {
  padding-right: 3rem;
}

.password-toggle {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 1.1rem;
  padding: 0.25rem;
  transition: color var(--transition);
}

.password-toggle:hover {
  color: var(--text-primary);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.375rem;
}

.form-error {
  font-size: 0.8rem;
  color: var(--error);
  margin-top: 0.375rem;
  display: none;
}

.form-error.visible {
  display: block;
}

/* ===== Checkbox ===== */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

.checkbox-group label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  font-family: var(--font);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  width: 100%;
  background: var(--primary);
  color: #FFFFFF;
  padding: 0.875rem;
  font-size: 1rem;
}

.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: var(--shadow);
  color: #FFFFFF;
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}

.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: var(--text-muted);
  color: var(--text-primary);
}

.btn-danger {
  background: var(--error);
  color: #FFFFFF;
}

.btn-danger:hover {
  background: var(--primary-dark);
  color: #FFFFFF;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 0.5rem 0.75rem;
}

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

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

.btn-icon {
  padding: 0.5rem;
  border-radius: 50%;
}

/* ===== Spinner ===== */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #FFFFFF;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: none;
}

.btn-primary.loading .spinner {
  display: inline-block;
}

.btn-primary.loading .btn-text {
  display: none;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== Divider ===== */
.divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ===== Auth Footer ===== */
.auth-footer {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.auth-footer a {
  font-weight: 500;
}

/* ===== Alert ===== */
.alert {
  padding: 0.875rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  display: none;
  align-items: flex-start;
  gap: 0.75rem;
  animation: slideDown 0.3s ease;
}

.alert.visible {
  display: flex;
}

.alert-success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(46, 125, 50, 0.2);
}

.alert-error {
  background: var(--error-bg);
  color: var(--error);
  border: 1px solid rgba(198, 40, 40, 0.2);
}

.alert-warning {
  background: var(--warning-bg);
  color: var(--warning);
  border: 1px solid rgba(245, 127, 23, 0.2);
}

.alert-info {
  background: var(--info-bg);
  color: var(--info);
  border: 1px solid rgba(21, 101, 192, 0.2);
}

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

/* ===== Dashboard Layout ===== */
.dashboard-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--surface);
  border-right: 1px solid var(--border-light);
  padding: 1.5rem 0;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
}

.sidebar-header {
  padding: 0 1.5rem 1.5rem;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sidebar-header img {
  width: 32px;
  height: auto;
}

.sidebar-header span {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
}

.sidebar-nav {
  flex: 1;
  padding: 1rem 0.75rem;
  overflow-y: auto;
}

.nav-section-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 1rem 0.75rem 0.5rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 450;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  margin-bottom: 2px;
}

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

.nav-item.active {
  background: var(--primary-bg);
  color: var(--primary);
  font-weight: 500;
}

.nav-item .icon {
  font-size: 1.1rem;
  width: 24px;
  text-align: center;
}

.sidebar-footer {
  padding: 1rem 0.75rem;
  border-top: 1px solid var(--border-light);
}

.dashboard-main {
  flex: 1;
  margin-left: 260px;
  padding: 2rem;
  max-width: 900px;
}

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.dashboard-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  background: var(--surface);
  border-radius: 50px;
  border: 1px solid var(--border);
  font-size: 0.9rem;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.85rem;
}

/* ===== Dashboard Cards ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.card-header h3 {
  font-size: 1.05rem;
  font-weight: 600;
}

.card-header .badge {
  font-size: 0.75rem;
  padding: 0.25rem 0.625rem;
  border-radius: 50px;
  background: var(--primary-bg);
  color: var(--primary);
  font-weight: 500;
}

/* ===== Info Grid ===== */
.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.info-item {
  padding: 1rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.info-item .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.375rem;
}

.info-item .value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  word-break: break-all;
}

/* ===== Session List ===== */
.session-list {
  list-style: none;
}

.session-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  transition: all var(--transition);
}

.session-item:hover {
  background: var(--surface-hover);
}

.session-item.current {
  border-color: var(--primary);
  background: var(--primary-bg);
}

.session-info h4 {
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.session-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.session-meta {
  text-align: right;
}

.session-meta .time {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ===== Security Log ===== */
.log-list {
  list-style: none;
}

.log-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--border-light);
}

.log-item:last-child {
  border-bottom: none;
}

.log-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.log-icon.login {
  background: var(--success-bg);
  color: var(--success);
}

.log-icon.logout {
  background: var(--info-bg);
  color: var(--info);
}

.log-icon.update {
  background: var(--warning-bg);
  color: var(--warning);
}

.log-icon.delete {
  background: var(--error-bg);
  color: var(--error);
}

.log-content {
  flex: 1;
}

.log-content h4 {
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.125rem;
}

.log-content p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.modal-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  max-width: 440px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform var(--transition);
}

.modal-overlay.visible .modal {
  transform: scale(1);
}

.modal h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.modal p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
}

/* ===== MFA Section ===== */
.mfa-status {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  margin-bottom: 1rem;
}

.mfa-status .status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.mfa-status .status-dot.enabled {
  background: var(--success);
}

.mfa-status .status-dot.disabled {
  background: var(--text-muted);
}

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  box-shadow: var(--shadow);
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
  max-width: 360px;
}

.toast-success {
  background: var(--success);
  color: #FFFFFF;
}

.toast-error {
  background: var(--error);
  color: #FFFFFF;
}

.toast-info {
  background: var(--info);
  color: #FFFFFF;
}

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

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

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .auth-left {
    display: none;
  }
  
  .auth-right {
    padding: 2rem;
  }
  
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .dashboard-main {
    margin-left: 0;
    padding: 1.5rem;
  }
  
  .info-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Page Transitions ===== */
.page-section {
  display: none;
  animation: fadeIn 0.3s ease;
}

.page-section.active {
  display: block;
}

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

/* ===== Password Strength ===== */
.password-strength {
  display: flex;
  gap: 4px;
  margin-top: 0.5rem;
}

.strength-bar {
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  transition: background var(--transition);
}

.strength-bar.weak { background: var(--error); }
.strength-bar.medium { background: var(--warning); }
.strength-bar.strong { background: var(--success); }

.strength-text {
  font-size: 0.75rem;
  margin-top: 0.25rem;
  color: var(--text-muted);
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border-light);
  margin-bottom: 1.5rem;
}

.tab {
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
  font-family: var(--font);
}

.tab:hover {
  color: var(--text-primary);
}

.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--text-muted);
}

.empty-state .icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.empty-state p {
  font-size: 0.95rem;
}