:root {
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --blue-200: #bfdbfe;
  --blue-300: #93c5fd;
  --blue-400: #60a5fa;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --indigo-500: #6366f1;
  --indigo-600: #4f46e5;

  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  --bg: #ffffff;
  --bg-alt: #f5f7fb;
  --surface: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --border: #e4e9f2;
  --shadow-sm: 0 1px 4px rgba(37, 99, 235, 0.06);
  --shadow-md: 0 4px 16px rgba(37, 99, 235, 0.1);
  --radius: 10px;
  --radius-lg: 14px;
  --transition: 0.2s ease;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: ui-monospace, 'SF Mono', Consolas, monospace;
}

.account-row.is-hidden { display: none !important; }

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
}
a { color: var(--blue-600); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--blue-700); }

.container { max-width: 960px; margin: 0 auto; padding: 0 24px; }

/* Header */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 960px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 56px; padding: 0 24px;
}
.logo-text { font-size: 1.05rem; font-weight: 700; color: var(--gray-800); }
.logo-accent { color: var(--blue-600); }
.nav-links { display: flex; gap: 2px; flex-wrap: wrap; }
.nav-link {
  font-size: 0.84rem; font-weight: 500; color: var(--text-secondary);
  padding: 5px 12px; border-radius: 6px; transition: all var(--transition);
  text-decoration: none;
}
.nav-link:hover, .nav-link.active { color: var(--blue-600); background: var(--blue-50); }

/* Hero */
.hero {
  background: linear-gradient(180deg, var(--blue-50) 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
  padding: 48px 0 40px;
  text-align: center;
}
.hero-title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800; line-height: 1.25;
  margin-bottom: 12px; letter-spacing: -0.5px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--blue-500) 0%, var(--indigo-600) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 0.92rem; color: var(--text-secondary);
  max-width: 520px; margin: 0 auto 20px;
}
.stats-row {
  display: flex; justify-content: center; gap: 24px; flex-wrap: wrap;
  margin-top: 8px;
}
.stat-chip {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 50px; padding: 6px 16px;
  font-size: 0.8rem; color: var(--text-secondary);
}
.stat-chip strong { color: var(--blue-600); font-weight: 700; }

.hero-actions {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 10px;
  margin-top: 18px;
}
.action-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 50px;
  font-size: 0.82rem; font-weight: 600; font-family: var(--font-sans);
  cursor: pointer; transition: all var(--transition); border: none;
}
.action-btn-primary {
  background: var(--blue-600); color: #fff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}
.action-btn-primary:hover { background: var(--blue-700); }
.action-btn-secondary {
  background: var(--surface); color: var(--blue-600);
  border: 1px solid var(--blue-200);
}
.action-btn-secondary:hover { background: var(--blue-50); border-color: var(--blue-400); }
.action-btn-light {
  background: var(--blue-50);
  color: var(--blue-600);
  border: 1px solid var(--blue-200);
  box-shadow: 0 1px 4px rgba(37, 99, 235, 0.08);
}
.action-btn-light:hover {
  background: var(--blue-100);
  border-color: var(--blue-400);
  color: var(--blue-700);
}

/* Promo */
.promo-group {
  display: flex; flex-direction: column; gap: 8px;
  padding-top: 20px;
}
.promo-link {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 18px;
  background: var(--bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text-primary);
  transition: all var(--transition); text-decoration: none;
}
.promo-link:hover {
  border-color: var(--blue-300); box-shadow: var(--shadow-sm);
  color: var(--text-primary);
}
.promo-icon { font-size: 1.15rem; flex-shrink: 0; }
.promo-body { flex: 1; font-size: 0.84rem; line-height: 1.4; }
.promo-arrow { font-size: 0.8rem; color: var(--blue-500); font-weight: 600; white-space: nowrap; }

/* Section */
.accounts-section { padding: 36px 0 20px; }
.section-bar { margin-bottom: 16px; }
.section-title { font-size: 1.15rem; font-weight: 700; color: var(--gray-800); }
.section-subtitle { font-size: 0.82rem; color: var(--text-secondary); margin-top: 4px; }

.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.filter-btn {
  padding: 5px 14px; border: 1px solid var(--border);
  border-radius: 50px; background: var(--surface);
  color: var(--text-secondary); font-size: 0.8rem;
  font-family: var(--font-sans); font-weight: 500;
  cursor: pointer; transition: all var(--transition);
}
.filter-btn:hover { border-color: var(--blue-400); color: var(--blue-600); }
.filter-btn.active { border-color: var(--blue-500); color: #fff; background: var(--blue-500); }

.accounts-list { display: flex; flex-direction: column; gap: 10px; min-height: 80px; }

.account-row {
  display: grid;
  grid-template-columns: 44px 1fr 1fr 110px;
  gap: 12px; align-items: center;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 18px;
  transition: all var(--transition);
  animation: fadeUp 0.35s ease backwards;
}
.account-row:hover {
  border-color: var(--blue-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.account-row.offline { opacity: 0.55; }
.account-row.slow { opacity: 0.85; }

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

.row-flag { font-size: 1.6rem; text-align: center; line-height: 1; }
.row-field { min-width: 0; }
.row-field-label {
  font-size: 0.65rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 1px; color: var(--text-secondary); margin-bottom: 3px;
}
.row-field-value {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 10px; background: var(--gray-50);
  border: 1px solid var(--gray-200); border-radius: 6px;
  cursor: pointer; transition: all var(--transition);
  font-family: var(--font-mono); font-size: 0.82rem;
  color: var(--gray-700);
  min-width: 0;
}
.row-field-value span {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.row-field-value:hover { border-color: var(--blue-400); background: var(--blue-50); }
.row-field-value:active { transform: scale(0.98); }
.row-field-value.is-readonly {
  cursor: default;
}
.row-field-value.is-readonly:hover {
  border-color: var(--gray-200);
  background: var(--gray-50);
}
.row-field-value.is-readonly:active {
  transform: none;
}

.row-meta {
  display: flex; flex-direction: column; align-items: flex-end; gap: 4px;
}
.row-status {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: 50px;
  font-size: 0.68rem; font-weight: 600;
  background: #ecfdf5; color: #059669;
}
.row-status.offline { background: #fef2f2; color: #dc2626; }
.row-status.slow { background: #fffbeb; color: #d97706; }
.row-status.testing { background: var(--gray-100); color: var(--gray-500); }
.row-status-dot { width: 5px; height: 5px; background: currentColor; border-radius: 50%; }
.row-region { font-size: 0.7rem; color: var(--text-secondary); font-weight: 500; }
.row-time { font-size: 0.65rem; color: var(--gray-400); }

.empty-state, .error-banner, .loading-state {
  text-align: center; padding: 32px 16px;
  color: var(--text-secondary); font-size: 0.9rem;
}
.error-banner {
  background: #fef2f2; border: 1px solid #fecaca;
  border-radius: var(--radius); color: #b91c1c; margin-bottom: 16px;
  text-align: left; padding: 12px 16px; font-size: 0.82rem;
}
.loading-spinner {
  width: 28px; height: 28px; margin: 0 auto 12px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--blue-500);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.update-info {
  display: flex; align-items: center; justify-content: center;
  gap: 8px; margin-top: 20px; font-size: 0.78rem; color: var(--text-secondary);
}
.refresh-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border: 1px solid var(--border);
  border-radius: 6px; background: var(--surface);
  color: var(--text-secondary); cursor: pointer;
  transition: all var(--transition);
}
.refresh-btn:hover { border-color: var(--blue-400); color: var(--blue-600); }
.refresh-btn.spinning svg { animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Clients */
.clients-section {
  padding: 48px 0;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}
.client-card {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
  text-decoration: none; color: inherit;
}
.client-card:hover {
  border-color: var(--blue-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  color: inherit;
}
.client-icon { font-size: 1.6rem; line-height: 1; flex-shrink: 0; }
.client-body { min-width: 0; flex: 1; }
.client-name { font-size: 0.92rem; font-weight: 700; color: var(--gray-800); margin-bottom: 2px; }
.client-platform {
  font-size: 0.68rem; font-weight: 600; color: var(--blue-600);
  background: var(--blue-50); display: inline-block;
  padding: 2px 8px; border-radius: 50px; margin-bottom: 6px;
}
.client-desc { font-size: 0.78rem; color: var(--text-secondary); line-height: 1.45; }
.client-dl {
  font-size: 0.75rem; font-weight: 600; color: var(--blue-600);
  margin-top: 8px;
}

/* Guide */
.guide-section {
  padding: 48px 0;
  background: var(--bg);
}
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}
.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem;
  text-align: center;
}
.step-num {
  font-size: 0.65rem; font-weight: 700;
  color: var(--blue-500); letter-spacing: 1px; margin-bottom: 4px;
}
.step .icon { font-size: 1.5rem; margin-bottom: 0.5rem; }
.step h4 { margin: 0 0 0.35rem; font-size: 0.9rem; }
.step p { margin: 0; font-size: 0.78rem; color: var(--text-secondary); }

/* FAQ */
.faq-section { padding: 48px 0; }
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.faq-item {
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; background: var(--surface);
}
.faq-question {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 16px; cursor: pointer; font-size: 0.86rem; font-weight: 500;
  user-select: none;
}
.faq-question:hover { background: var(--gray-50); }
.faq-arrow { color: var(--gray-400); transition: transform var(--transition); font-size: 1.1rem; }
.faq-item.open .faq-arrow { transform: rotate(90deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-item.open .faq-answer { max-height: 280px; }
.faq-answer p { padding: 0 16px 14px; font-size: 0.82rem; color: var(--text-secondary); }

/* Footer */
.footer {
  padding: 32px 0; text-align: center;
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
}
.footer-text { font-size: 0.78rem; color: var(--text-secondary); margin: 8px 0 4px; }
.footer-copyright { font-size: 0.72rem; color: var(--gray-400); }

/* Toast */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(80px);
  display: flex; align-items: center; gap: 8px;
  background: var(--gray-800); color: #fff;
  padding: 10px 18px; border-radius: 50px;
  font-size: 0.84rem; font-weight: 500;
  opacity: 0; transition: all 0.3s ease; z-index: 2000;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .header-inner { padding: 0 16px; height: auto; min-height: 56px; padding-top: 8px; padding-bottom: 8px; }
  .hero { padding: 32px 0 28px; }
  .stats-row { gap: 8px; }
  .stat-chip { padding: 5px 12px; font-size: 0.75rem; }
  .hero-actions { gap: 8px; }
  .action-btn { padding: 7px 14px; font-size: 0.78rem; }

  .account-row {
    grid-template-columns: 40px 1fr;
    grid-template-rows: auto auto auto;
    gap: 8px 10px;
    padding: 12px 14px;
  }
  .row-flag {
    grid-column: 1;
    grid-row: 1 / 3;
    align-self: center;
    font-size: 1.4rem;
  }
  .account-row .row-field:nth-child(2) { grid-column: 2; grid-row: 1; }
  .account-row .row-field:nth-child(3) { grid-column: 2; grid-row: 2; }
  .row-meta {
    grid-column: 1 / -1;
    grid-row: 3;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding-top: 4px;
    border-top: 1px solid var(--gray-100);
    margin-top: 2px;
  }
  .row-field-value { font-size: 0.78rem; padding: 8px 10px; }
  .faq-grid { grid-template-columns: 1fr; }
  .clients-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .promo-group {
    padding-top: 20px; 
}
  
}