:root {
  --bg-overlay: rgba(2, 6, 14, 0.56);
  --text-0: #f6f9ff;
  --text-1: rgba(235, 242, 255, 0.92);
  --text-2: rgba(205, 220, 255, 0.78);
  --text-muted: rgba(175, 191, 226, 0.62);
  --accent: #35d1ff;
  --accent-2: #3f8eff;
  --card-bg: rgba(10, 16, 30, 0.68);
  --card-border: rgba(255, 255, 255, 0.16);
  --excellent: #5bff9d;
  --good: #7ad4ff;
  --fair: #ffc45b;
  --poor: #ff7f7f;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  color: var(--text-0);
  font-family: "Segoe UI", "SF Pro Display", "Roboto", sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
}

.background {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-size: cover;
  background-position: center;
  transition: opacity 0.6s ease;
}

.overlay {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--bg-overlay);
  backdrop-filter: blur(1px);
}

.topbar {
  width: min(980px, 100%);
  margin: 0 auto;
  padding: 1.5rem 1.2rem 0.3rem;
  display: flex;
  justify-content: flex-end;
  position: relative;
  z-index: 50;
}

.language-dropdown {
  position: relative;
  z-index: 60;
}

.language-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 96px;
  padding: 0.45rem 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  color: var(--text-1);
  background: rgba(0, 0, 0, 0.25);
  cursor: pointer;
  font-weight: 600;
  backdrop-filter: blur(8px);
}

.language-toggle:hover {
  background: rgba(0, 0, 0, 0.4);
}

.language-menu {
  position: absolute;
  top: calc(100% + 0.45rem);
  right: 0;
  width: 180px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(6, 11, 22, 0.95);
  backdrop-filter: blur(10px);
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: all 0.2s ease;
  z-index: 70;
}

.language-menu.active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.language-option {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 0.8rem;
  cursor: pointer;
  color: var(--text-1);
}

.language-option:hover,
.language-option.selected {
  background: rgba(255, 255, 255, 0.09);
}

.flag-icon {
  width: 1.2rem;
  height: 1.2rem;
  display: inline-flex;
}

.flag-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.container {
  width: min(980px, 100%);
  margin: 0 auto;
  padding: 0 1.2rem 1.8rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  flex: 1;
}

.logo-header {
  width: min(620px, 92vw);
  margin: 0.2rem auto 0.3rem;
  display: block;
}

.hero,
.advanced-panel {
  width: 100%;
  border-radius: 20px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.24);
}

.hero {
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
}

.server-label {
  margin: 0;
  font-size: 1rem;
  color: var(--text-2);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.region-label {
  margin: 0.45rem 0 1.25rem;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.primary-metric {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  line-height: 1;
}

.primary-value {
  font-size: clamp(3.6rem, 10vw, 6.8rem);
  font-weight: 750;
  letter-spacing: -0.04em;
}

.primary-unit {
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  color: var(--text-2);
  font-weight: 600;
}

.quality-label {
  margin: 0.65rem 0 1.2rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.progress-wrap {
  display: grid;
  gap: 0.45rem;
}

.progress-bar {
  height: 8px;
  width: 100%;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.progress-value {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  transition: width 0.22s ease;
}

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

.start-button {
  width: fit-content;
  padding: 0.65rem 1.2rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  color: var(--text-0);
  background: rgba(0, 0, 0, 0.18);
  cursor: pointer;
  font-weight: 600;
}

.start-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.action-row {
  margin-top: 1rem;
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.stop-button {
  width: fit-content;
  padding: 0.65rem 1.2rem;
  border: 1px solid rgba(255, 127, 127, 0.5);
  border-radius: 999px;
  color: #ffd4d4;
  background: rgba(78, 12, 12, 0.36);
  cursor: pointer;
  font-weight: 600;
}

.stop-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.advanced-panel {
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.advanced-title {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-2);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.metric-card {
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.72rem 0.8rem;
}

.metric-card .label {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.metric-card .value {
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 0.3rem;
}

.status-row {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

footer {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(0, 0, 0, 0.28);
  padding: 0.9rem 1.2rem;
}

.footer-row {
  width: min(980px, 100%);
  margin: 0 auto;
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-row a {
  color: var(--text-1);
  text-decoration: none;
}

.quality-excellent {
  color: var(--excellent);
}

.quality-good {
  color: var(--good);
}

.quality-fair {
  color: var(--fair);
}

.quality-poor {
  color: var(--poor);
}

@media (max-width: 680px) {
  .topbar,
  .container,
  footer {
    padding-left: 0.85rem;
    padding-right: 0.85rem;
  }

  .metric-grid {
    grid-template-columns: 1fr;
  }

  .status-row {
    flex-direction: column;
  }

  .hero,
  .advanced-panel {
    padding: 1.1rem;
  }
}