/* ==========================================================================
   GSC MCP Hub - Modern Premium Dark Theme CSS
   ========================================================================== */

:root {
  --bg-main: #070b12;
  --bg-card: #0d1527;
  --bg-card-hover: #131e36;
  --bg-card-alt: #101a30;
  --border-subtle: #1e293b;
  --border-active: #38bdf8;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --primary: #38bdf8;
  --primary-hover: #0284c7;
  --primary-glow: rgba(56, 189, 248, 0.15);
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.12);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.12);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & Navigation */
.app-header {
  background-color: rgba(13, 21, 39, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-badge {
  font-size: 0.7rem;
  background: rgba(56, 189, 248, 0.15);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(56, 189, 248, 0.3);
  font-weight: 600;
}

.header-nav {
  display: flex;
  gap: 0.5rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  cursor: pointer;
  background: transparent;
  border: none;
}

.nav-link:hover {
  color: var(--text-main);
  background-color: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
  color: var(--primary);
  background-color: rgba(56, 189, 248, 0.1);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Layout */
.main-content {
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #fff;
  box-shadow: 0 2px 10px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0369a1, #0284c7);
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.4);
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--text-dim);
}

.btn-danger {
  background-color: var(--danger-bg);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background-color: var(--danger);
  color: #fff;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.8rem;
}

/* Cards & Grid */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-cols-4 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.grid-cols-2 {
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.stat-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.stat-desc {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Page Section Headers */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Tables */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.table th {
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--text-muted);
  font-weight: 600;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-main);
}

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

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

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success {
  background-color: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-warning {
  background-color: var(--warning-bg);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-danger {
  background-color: var(--danger-bg);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-info {
  background-color: var(--primary-glow);
  color: var(--primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  background-color: var(--bg-main);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.35rem;
}

/* Code Snippets & Pre */
pre.code-block {
  background-color: #05080f;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.85rem;
  color: #e2e8f0;
  line-height: 1.6;
}

/* Empty States */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  background-color: var(--bg-card);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-lg);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.6;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.empty-state-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto 1.5rem;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
}

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

.modal-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  max-width: 600px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  background-color: rgba(0,0,0,0.15);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

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

.toast {
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: slideIn 0.25s ease-out;
}

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

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

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

/* Login Screen Styles */
.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: radial-gradient(circle at 50% 20%, rgba(56, 189, 248, 0.08), transparent 70%), var(--bg-main);
}

.login-card {
  width: 100%;
  max-width: 440px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.05);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.login-header {
  text-align: center;
}

.login-logo {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.4);
}

.login-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.login-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.login-alert {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background-color: var(--danger-bg);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--danger);
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.login-footer-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.25rem;
}