/* ==========================================================================
   VPN Portal — Corporate Dark Theme
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  --color-bg: #0f1117;
  --color-bg-elevated: #1a1d27;
  --color-bg-hover: #22252f;
  --color-bg-input: #14161e;
  --color-border: #2a2d3a;
  --color-border-focus: #3d4152;
  --color-text: #e4e5e9;
  --color-text-secondary: #8b8f9e;
  --color-text-muted: #5c6070;
  --color-accent: #22c55e;
  --color-accent-hover: #16a34a;
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-warning: #f59e0b;
  --color-info: #3b82f6;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-elevated: 0 4px 12px rgba(0, 0, 0, 0.4);
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

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

a:hover {
  color: var(--color-accent-hover);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.page-content {
  padding: 32px 0 64px;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background-color: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background-color: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 700;
  color: #0f1117;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.nav-user {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.nav-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-color: var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Page Container
   -------------------------------------------------------------------------- */
.page-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

.page-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.page-nav .nav-link {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.page-nav .nav-link:hover,
.page-nav .nav-link.active {
  background-color: var(--color-bg-hover);
  color: var(--color-text);
}

.page-nav .btn {
  margin-left: auto;
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.card-subtitle {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* --------------------------------------------------------------------------
   Stats Grid
   -------------------------------------------------------------------------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.stats-card {
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-fast);
}

.stats-card:hover {
  border-color: var(--color-border-focus);
}

.stats-card-value {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}

.stats-card-value.accent {
  color: var(--color-accent);
}

.stats-card-value.danger {
  color: var(--color-danger);
}

.stats-card-value.info {
  color: var(--color-info);
}

.stats-card-value.warning {
  color: var(--color-warning);
}

.stats-card-label {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              transform var(--transition-fast);
  user-select: none;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #0f1117;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
}

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

.btn-danger:hover:not(:disabled) {
  background-color: var(--color-danger-hover);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

.btn-outline:hover:not(:disabled) {
  border-color: var(--color-text-secondary);
  color: var(--color-text);
  background-color: var(--color-bg-hover);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 1rem;
  border-radius: var(--radius-md);
}

/* --------------------------------------------------------------------------
   Badges
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 100px;
  line-height: 1.5;
}

.badge-success {
  background-color: rgba(34, 197, 94, 0.12);
  color: var(--color-accent);
}

.badge-danger {
  background-color: rgba(239, 68, 68, 0.12);
  color: var(--color-danger);
}

.badge-warning {
  background-color: rgba(245, 158, 11, 0.12);
  color: var(--color-warning);
}

.badge-info {
  background-color: rgba(59, 130, 246, 0.12);
  color: var(--color-info);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

.table th {
  text-align: left;
  padding: 10px 16px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  vertical-align: middle;
}

.table tbody tr {
  transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
  background-color: var(--color-bg-hover);
}

.table tbody tr:nth-child(even) {
  background-color: rgba(26, 29, 39, 0.5);
}

.table tbody tr:nth-child(even):hover {
  background-color: var(--color-bg-hover);
}

.table td.text-right,
.table th.text-right {
  text-align: right;
}

.table td.text-center,
.table th.text-center {
  text-align: center;
}

/* --------------------------------------------------------------------------
   Filters
   -------------------------------------------------------------------------- */
.filters {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.filters-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.filters-label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Form Inputs
   -------------------------------------------------------------------------- */
.input,
.select {
  appearance: none;
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  width: 100%;
}

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

.input:focus,
.select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

.select {
  padding-right: 36px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b8f9e' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  cursor: pointer;
}

.input-sm,
.select-sm {
  padding: 6px 10px;
  font-size: 0.8125rem;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

/* --------------------------------------------------------------------------
   VLESS Link Block
   -------------------------------------------------------------------------- */
.vless-link-block {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 16px;
}

.vless-link-text {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-accent);
  word-break: break-all;
  line-height: 1.6;
  user-select: all;
}

.vless-link-block .btn {
  flex-shrink: 0;
  margin-top: 2px;
}

/* --------------------------------------------------------------------------
   Config Page Elements
   -------------------------------------------------------------------------- */
.config-section {
  margin-bottom: 24px;
}

.config-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.config-hint {
  margin-top: 10px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.config-instructions-title {
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

.app-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.app-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.app-store-link {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: 100px;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.app-store-link:hover {
  background-color: rgba(34, 197, 94, 0.08);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.config-instructions-hint {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.config-warning {
  margin-top: 8px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.config-actions {
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   QR Code
   -------------------------------------------------------------------------- */
.qr-code {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background-color: #fff;
  border-radius: var(--radius-md);
  width: fit-content;
}

.qr-code img {
  display: block;
  width: 200px;
  height: 200px;
  image-rendering: pixelated;
}

/* --------------------------------------------------------------------------
   Login Page
   -------------------------------------------------------------------------- */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.login-card .card-title {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.login-card .card-subtitle {
  margin-bottom: 28px;
}

.login-card .btn {
  width: 100%;
}

.login-logo {
  width: 56px;
  height: 56px;
  background-color: var(--color-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.25rem;
  font-weight: 700;
  color: #0f1117;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  text-align: center;
  padding: 80px 24px;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: var(--color-text);
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 540px;
  margin: 0 auto 32px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

/* --------------------------------------------------------------------------
   Alerts
   -------------------------------------------------------------------------- */
.alert {
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 16px;
  border: 1px solid transparent;
}

.alert-info {
  background-color: rgba(59, 130, 246, 0.08);
  border-color: rgba(59, 130, 246, 0.2);
  color: var(--color-info);
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.2);
  color: var(--color-warning);
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.08);
  border-color: rgba(239, 68, 68, 0.2);
  color: var(--color-danger);
}

.alert-success {
  background-color: rgba(34, 197, 94, 0.08);
  border-color: rgba(34, 197, 94, 0.2);
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.text-accent { color: var(--color-accent); }
.text-danger { color: var(--color-danger); }
.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.text-sm { font-size: 0.8125rem; }
.text-xs { font-size: 0.75rem; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.font-mono { font-family: var(--font-mono); }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1; }

.hidden { display: none; }

/* --------------------------------------------------------------------------
   Media Queries
   -------------------------------------------------------------------------- */

/* Tablet and below */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-title {
    font-size: 2rem;
  }
}

/* Tablet portrait */
@media (max-width: 768px) {
  .nav {
    padding: 12px 16px;
  }

  .nav-links {
    gap: 4px;
  }

  .nav-links a {
    padding: 6px 10px;
    font-size: 0.8125rem;
  }

  .layout {
    padding: 0 16px;
  }

  .page-content {
    padding: 24px 0 48px;
  }

  .card {
    padding: 18px;
  }

  .stats-card {
    padding: 16px;
  }

  .stats-card-value {
    font-size: 1.5rem;
  }

  .hero {
    padding: 48px 16px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .filters {
    flex-direction: column;
    align-items: stretch;
  }

  .table th,
  .table td {
    padding: 10px 12px;
  }
}

/* Mobile */
@media (max-width: 375px) {
  html {
    font-size: 14px;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .stats-card {
    padding: 14px;
  }

  .stats-card-value {
    font-size: 1.25rem;
  }

  .nav {
    padding: 10px 12px;
  }

  .nav-logo {
    font-size: 1rem;
  }

  .nav-links a {
    padding: 6px 8px;
    font-size: 0.75rem;
  }

  .layout {
    padding: 0 12px;
  }

  .hero-title {
    font-size: 1.5rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .vless-link-block {
    flex-direction: column;
    align-items: stretch;
  }

  .vless-link-block .btn {
    width: 100%;
  }

  .qr-code img {
    width: 160px;
    height: 160px;
  }
}