:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.8);
  --accent-cyan: #22d3ee;
  --accent-emerald: #34d399;
  --accent-amber: #fbbf24;
  --accent-rose: #fb7185;
  --text-primary: #f1f5f9;
  --text-muted: #94a3b8;
  --border-color: rgba(148, 163, 184, 0.15);
  --font-display: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-display);
  background: var(--bg-primary);
  color: var(--text-primary);
}

.page-wrapper {
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.background-pattern {
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(34, 211, 238, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(52, 211, 153, 0.08), transparent),
    radial-gradient(ellipse 50% 30% at 0% 80%, rgba(251, 191, 36, 0.06), transparent);
  pointer-events: none;
  z-index: 0;
}

.container {
  position: relative;
  z-index: 1;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.header {
  text-align: center;
  margin-bottom: 1rem;
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.logo-icon {
  width: 36px;
  height: 36px;
  color: var(--accent-cyan);
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 400;
}

.speed-display {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  width: 100%;
  margin-bottom: 1rem;
  flex-shrink: 0;
}

.speed-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.75rem 1rem;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform 0.2s, border-color 0.2s;
}

.speed-card:hover {
  transform: translateY(-2px);
  border-color: rgba(148, 163, 184, 0.25);
}

.speed-card.active {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.2);
}

.download-card .card-icon { color: var(--accent-cyan); }
.upload-card .card-icon { color: var(--accent-emerald); }
.ping-card .card-icon { color: var(--accent-amber); }

.card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.card-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.speed-value {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
}

.speed-unit {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

.progress-section {
  width: 100%;
  margin-bottom: 0.75rem;
  flex-shrink: 0;
}

.progress-bar {
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-emerald));
  border-radius: 3px;
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
}

.btn-start {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.75rem 1.5rem;
  flex-shrink: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--bg-primary);
  background: linear-gradient(135deg, var(--accent-cyan), #06b6d4);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-start:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(34, 211, 238, 0.35);
}

.btn-start:active:not(:disabled) {
  transform: translateY(0);
}

.btn-start:disabled {
  opacity: 0.8;
  cursor: not-allowed;
}

.btn-loader {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(10, 14, 23, 0.3);
  border-top-color: var(--bg-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.btn-start.loading .btn-text {
  visibility: hidden;
}

.btn-start.loading .btn-loader {
  display: block;
  position: absolute;
}

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

.results-summary {
  width: 100%;
  margin-top: 0.75rem;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  backdrop-filter: blur(12px);
  flex-shrink: 0;
}

.results-summary h3 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.summary-item {
  text-align: center;
}

.summary-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.summary-value {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent-cyan);
}

.network-status-card {
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.3s, border-color 0.3s;
  flex-shrink: 0;
}

.network-status-card.offline {
  background: rgba(251, 113, 133, 0.2);
  border: 1px solid var(--accent-rose);
  color: #fda4af;
}

.network-status-card.online {
  background: rgba(52, 211, 153, 0.2);
  border: 1px solid var(--accent-emerald);
  color: #6ee7b7;
}

.network-status-card.weak {
  background: rgba(251, 191, 36, 0.2);
  border: 1px solid var(--accent-amber);
  color: #fcd34d;
}

.network-status-card.checking {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.network-status-icon {
  font-size: 1.1rem;
}

.footer {
  text-align: center;
  padding: 0.5rem 1rem;
  margin-top: auto;
  color: var(--text-muted);
  font-size: 0.8rem;
  flex-shrink: 0;
}

.footer a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.2s;
}

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

@media (max-width: 480px) {
  .speed-display {
    grid-template-columns: 1fr;
  }
  
  .summary-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-height: 600px) {
  .container { padding: 0.5rem 1rem; }
  .header { margin-bottom: 0.5rem; }
  .logo h1 { font-size: 1.25rem; }
  .logo-icon { width: 28px; height: 28px; }
  .subtitle { font-size: 0.8rem; }
  .speed-card { padding: 0.5rem 0.75rem; }
  .speed-value { font-size: 1.1rem; }
  .results-summary { padding: 0.75rem; margin-top: 0.5rem; }
}