/* ==========================================================================
   SpeedTest — Warm Cream, Terracotta Red & Sage Green Light Theme
   Palette:
   - #F1DEC4 (warm cream) — main page background
   - #BD4444 (terracotta red) — primary accent: GO button, active tabs, highlights
   - #73976A (sage green) — download stats, success states
   - #677E61 (deep olive green) — upload stats, secondary highlights, icons
   - #3d4a38 (dark olive) — header text, titles
   - #2a2a2a (dark charcoal) — body & display text
   - #FBF6EE — content cards background with soft warm shadows
   ========================================================================== */

:root {
  /* Warm Cream & Terracotta Primary Palette */
  --bg-app: #F1DEC4;
  --bg-radial-1: rgba(189, 68, 68, 0.05);
  --bg-radial-2: rgba(115, 151, 106, 0.07);

  --surface-card: #FBF6EE;
  --surface-panel: #FBF6EE;
  --surface-hover: #f3e9db;
  
  --terracotta: #BD4444;
  --terracotta-hover: #a83939;
  --sage-green: #73976A;
  --deep-olive: #677E61;
  --dark-olive: #3d4a38;
  --charcoal: #2a2a2a;

  --primary-accent: #BD4444;
  --download-color: #73976A;
  --upload-color: #677E61;
  --ping-color: #BD4444;

  --text-hero: #2a2a2a;
  --text-main: #2a2a2a;
  --text-muted: #677E61;
  --text-dim: #7a8676;
  --scale-text: #677E61;

  --track-bg: #e5d2b8;
  --needle-pivot: #FBF6EE;

  --border-subtle: rgba(103, 126, 97, 0.16);
  --border-active: rgba(189, 68, 68, 0.4);
  --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.8);
  --card-shadow: 0 8px 24px -4px rgba(103, 126, 97, 0.1), 0 2px 8px rgba(0, 0, 0, 0.03);
  --btn-shadow: 0 4px 16px rgba(189, 68, 68, 0.28);

  /* Fonts */
  --font-sans: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Plus Jakarta Sans', 'Inter', sans-serif;
}

[data-theme="dark"] {
  /* High-Contrast Near-Black Dark Mode (#0f0f10 / #1a1a1c) */
  --bg-app: #0f0f10;
  --bg-radial-1: rgba(214, 79, 79, 0.05);
  --bg-radial-2: rgba(126, 184, 114, 0.04);

  --surface-card: #1a1a1c;
  --surface-panel: #1a1a1c;
  --surface-hover: #242427;

  --terracotta: #d64f4f;
  --terracotta-hover: #e05e5e;
  --sage-green: #7eb872;
  --deep-olive: #86a37e;
  --dark-olive: #f0f0f0;
  --charcoal: #f5f5f5;

  --primary-accent: #d64f4f;
  --download-color: #7eb872;
  --upload-color: #86a37e;
  --ping-color: #d64f4f;

  --text-hero: #f5f5f5;
  --text-main: #e8e8e8;
  --text-muted: #a0a0a0;
  --text-dim: #888888;
  --scale-text: #a0a0a0;

  --track-bg: #232326;
  --needle-pivot: #1a1a1c;

  --border-subtle: rgba(214, 79, 79, 0.15);
  --border-active: rgba(214, 79, 79, 0.5);
  --glass-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.45), 0 1px 3px rgba(0, 0, 0, 0.3);
  --btn-shadow: 0 4px 20px rgba(214, 79, 79, 0.4);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 3rem 2.5rem 4rem;
  overflow-x: hidden;
  background-image: 
    radial-gradient(ellipse 70% 45% at 50% 0%, var(--bg-radial-1) 0%, transparent 75%),
    radial-gradient(ellipse 50% 35% at 50% 100%, var(--bg-radial-2) 0%, transparent 75%);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ==========================================================================
   Main Content Container (Full-Page Layout, Max-Width 940px)
   ========================================================================== */
.app-card {
  width: 100%;
  max-width: 940px;
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
  backdrop-filter: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Top App Bar */
.app-nav {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.brand-badge {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.2px;
  color: var(--dark-olive);
}

.brand-dot {
  width: 8px;
  height: 8px;
  background: var(--terracotta);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(189, 68, 68, 0.45);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

/* ==========================================================================
   Apple-Style Precision Toggle Switch (iOS / macOS Control Center Style)
   ========================================================================== */
.apple-switch {
  background: transparent;
  border: none;
  padding: 0;
  cursor: pointer;
  outline: none;
  display: inline-flex;
  align-items: center;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: transform 0.15s ease;
}

.apple-switch:hover {
  transform: scale(1.03);
}

.apple-switch:active .switch-thumb {
  transform: translateX(0) scale(0.93) !important;
}

[data-theme="dark"] .apple-switch:active .switch-thumb {
  transform: translateX(24px) scale(0.93) !important;
}

.switch-track {
  position: relative;
  width: 52px;
  height: 28px;
  border-radius: 9999px;
  background: #e5e5ea;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.04);
  transition: background-color 280ms cubic-bezier(0.34, 1.56, 0.64, 1), border-color 280ms ease, box-shadow 280ms ease;
  display: block;
}

[data-theme="dark"] .switch-track {
  background: #2c2c2e;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5), 0 1px 3px rgba(0, 0, 0, 0.3);
}

.switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(180deg, #ffffff 0%, #ececf0 100%);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.22), 0 1px 2px rgba(0, 0, 0, 0.14), inset 0 1px 0 rgba(255, 255, 255, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateX(0);
  transition: transform 280ms cubic-bezier(0.34, 1.56, 0.64, 1), background 280ms ease, box-shadow 280ms ease;
}

[data-theme="dark"] .switch-thumb {
  transform: translateX(24px);
  background: linear-gradient(180deg, #3d3d40 0%, #252528 100%);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.6), 0 1px 2px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

/* Switch Vector Icons with Smooth Crossfade & Rotation */
.switch-icon {
  position: absolute;
  width: 12px;
  height: 12px;
  display: block;
  transition: opacity 220ms ease, transform 280ms cubic-bezier(0.34, 1.56, 0.64, 1), color 220ms ease;
}

/* Light Mode: Sun visible, Moon hidden */
.icon-sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
  color: #d97706;
}

.icon-moon {
  opacity: 0;
  transform: scale(0.5) rotate(-35deg);
  color: #f5c76e;
}

/* Dark Mode: Moon visible, Sun hidden */
[data-theme="dark"] .icon-sun {
  opacity: 0;
  transform: scale(0.5) rotate(35deg);
}

[data-theme="dark"] .icon-moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
  color: #f5c76e;
  filter: drop-shadow(0 0 3px rgba(245, 199, 110, 0.5));
}

/* Server Selector Pill */
.server-pill {
  display: flex;
  align-items: center;
  background: var(--surface-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 0.4rem 0.85rem;
  box-shadow: var(--card-shadow);
  transition: all 0.2s ease;
}

.server-pill:hover,
.server-pill:focus-within {
  border-color: var(--border-active);
  background: var(--surface-hover);
}

.server-select {
  background: transparent;
  color: var(--dark-olive);
  border: none;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2px;
  outline: none;
  cursor: pointer;
  padding-right: 0.2rem;
  transition: color 0.2s ease;
}

.server-select:hover {
  color: var(--charcoal);
}

.server-select option {
  background: var(--surface-card);
  color: var(--charcoal);
}

/* Top Right Dev Badge */
.dev-top-badge {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--surface-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 0.4rem 0.85rem;
  font-size: 0.72rem;
  color: var(--dark-olive);
  box-shadow: var(--card-shadow);
  transition: all 0.2s ease;
}

.dev-top-badge:hover {
  border-color: var(--border-active);
  background: var(--surface-hover);
}

.dev-top-badge .dev-tag {
  font-weight: 700;
  letter-spacing: 0.5px;
}

.dev-name {
  color: var(--terracotta);
  font-weight: 700;
  text-decoration: none;
  transition: color 0.2s ease;
}

.dev-name:hover {
  color: var(--terracotta-hover);
}

.dev-mini-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.dev-mini-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--deep-olive);
  text-decoration: none;
  transition: all 0.2s ease;
  padding: 0.1rem;
  line-height: 1;
}

.dev-mini-links a:hover {
  color: var(--terracotta);
  transform: translateY(-1px) scale(1.12);
}

.dev-icon {
  width: 13px;
  height: 13px;
  display: block;
}

/* 2. Thin Horizontal Accent Line */
.header-accent-line {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(103, 126, 97, 0.2) 15%, var(--terracotta) 50%, rgba(103, 126, 97, 0.2) 85%, transparent 100%);
  margin-bottom: 4.5rem; /* Generous 72px spacing */
  opacity: 0.65;
}

/* ==========================================================================
   3. Idle View (Default State Before Testing)
   ========================================================================== */
.idle-view {
  width: 100%;
  max-width: 580px;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: fadeIn 0.3s cubic-bezier(0.2, 0.8, 0.3, 1);
}

.idle-view.hidden,
.test-view.hidden {
  display: none !important;
}

.test-view {
  width: 100%;
  max-width: 580px;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: fadeIn 0.3s cubic-bezier(0.2, 0.8, 0.3, 1);
}

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

/* Centerpiece: Large Circular GO Dial Button (35% Bigger) */
.go-dial-wrapper {
  position: relative;
  width: 280px;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 0 2.75rem; /* 44px spacing */
}

.go-circle-btn {
  width: 256px;
  height: 256px;
  border-radius: 50%;
  background: var(--surface-card);
  border: 4px solid var(--terracotta);
  box-shadow: 0 0 0 14px rgba(189, 68, 68, 0.12), 0 16px 45px rgba(189, 68, 68, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  outline: none;
  position: relative;
  transition: all 0.3s cubic-bezier(0.2, 0.8, 0.3, 1);
  user-select: none;
}

.go-circle-btn:hover {
  transform: translateY(-2px) scale(1.04);
  border-color: var(--terracotta-hover);
  box-shadow: 0 0 0 20px rgba(189, 68, 68, 0.18), 0 20px 60px rgba(189, 68, 68, 0.32);
}

.go-circle-btn:active {
  transform: translateY(0) scale(0.97);
  box-shadow: 0 0 0 10px rgba(189, 68, 68, 0.25);
}

.go-text {
  font-family: var(--font-display);
  font-size: 3.75rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--charcoal);
  transition: color 0.2s ease, transform 0.2s ease;
}

.go-circle-btn:hover .go-text {
  color: var(--terracotta);
  transform: scale(1.06);
}

/* 4. Connection Quick Info Row */
.connection-quick-info {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.85rem 1.4rem;
  background: var(--surface-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  margin-bottom: 2.0rem; /* 32px spacing */
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.conn-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.conn-icon {
  font-size: 0.9rem;
  color: var(--deep-olive);
}

.conn-label {
  color: var(--deep-olive);
  font-weight: 600;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.conn-val {
  color: var(--charcoal);
  font-weight: 600;
}

.conn-divider {
  color: var(--border-subtle);
  font-size: 0.85rem;
}

.change-server-link {
  background: none;
  border: none;
  color: var(--terracotta);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  padding: 0.1rem 0.2rem;
  transition: color 0.2s ease, opacity 0.2s ease;
  outline: none;
}

.change-server-link:hover {
  color: var(--terracotta-hover);
}

/* 5. Row of 2 Mode Toggles (Multi-Stream / Single-Stream) */
.mode-toggles-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 3.0rem; /* 48px spacing */
}

.mode-pill {
  background: var(--surface-panel);
  border: 1px solid var(--deep-olive);
  border-radius: 9999px;
  padding: 0.45rem 1.05rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--deep-olive);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
  outline: none;
  user-select: none;
}

.mode-pill:hover {
  color: var(--dark-olive);
  background: var(--surface-hover);
}

.mode-pill.active {
  color: #ffffff;
  border-color: var(--terracotta);
  background: var(--terracotta);
  box-shadow: 0 4px 12px rgba(189, 68, 68, 0.25);
}

.mode-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--deep-olive);
  transition: background-color 0.2s ease;
}

.mode-pill.active .mode-dot {
  background: #ffffff;
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.8);
}

/* Action Button Group in Test View */
.test-actions-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 2.5rem;
  width: 100%;
}

.test-actions-group .main-btn {
  margin-bottom: 0;
}

.back-home-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.35rem 0.8rem;
  border-radius: 8px;
  transition: color 0.2s ease;
  outline: none;
}

.back-home-btn:hover {
  color: var(--terracotta);
}

/* ==========================================================================
   1. Top Phase Tabs (DOWNLOAD & UPLOAD with Animated Underline)
   ========================================================================== */
.phases-tabs-row {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.phase-tab {
  background: var(--surface-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  padding: 0.85rem 1rem 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow: hidden;
  transition: all 300ms cubic-bezier(0.2, 0.8, 0.3, 1);
}

.phase-tab-header {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.25rem;
}

.phase-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  font-size: 0.7rem;
  font-weight: 800;
}

.phase-icon.down {
  background: rgba(115, 151, 106, 0.15);
  color: var(--sage-green);
}

.phase-icon.up {
  background: rgba(103, 126, 97, 0.15);
  color: var(--deep-olive);
}

.phase-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.8px;
  color: var(--deep-olive);
  text-transform: uppercase;
  transition: color 250ms ease;
}

.phase-tab.active .phase-title {
  color: var(--charcoal);
}

.phase-tab-val-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.phase-tab-val {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--charcoal);
  font-variant-numeric: tabular-nums;
  transition: color 250ms ease;
}

.phase-tab.active#stat-download .phase-tab-val,
.phase-tab.completed#stat-download .phase-tab-val {
  color: var(--sage-green);
}

.phase-tab.active#stat-upload .phase-tab-val,
.phase-tab.completed#stat-upload .phase-tab-val {
  color: var(--deep-olive);
}

.phase-unit {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-dim);
}

/* Thin Animated Underline */
.phase-underline {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  transform: scaleX(0);
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.3, 1), background-color 300ms ease;
  transform-origin: center;
}

.phase-tab.active#stat-download .phase-underline {
  background: var(--sage-green);
  box-shadow: 0 0 8px var(--sage-green);
  transform: scaleX(1);
}

.phase-tab.active#stat-upload .phase-underline {
  background: var(--deep-olive);
  box-shadow: 0 0 8px var(--deep-olive);
  transform: scaleX(1);
}

.phase-tab.completed {
  border-color: var(--border-subtle);
}

.phase-tab.active {
  border-color: var(--border-active);
  background: var(--surface-hover);
  transform: translateY(-2px);
}

/* ==========================================================================
   2. Compact Single-Row Telemetry Strip
   ========================================================================== */
.telemetry-strip {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.85rem;
  background: var(--surface-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  margin-bottom: 1.4rem;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.telemetry-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
}

.tele-circle-icon {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 800;
  line-height: 1;
}

.ping-bg {
  background: rgba(189, 68, 68, 0.12);
  color: var(--terracotta);
}

.jitter-bg {
  background: rgba(189, 68, 68, 0.12);
  color: var(--terracotta);
}

.loss-bg {
  background: rgba(103, 126, 97, 0.12);
  color: var(--deep-olive);
}

.tele-label {
  color: var(--deep-olive);
  font-weight: 600;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.tele-val {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--charcoal);
  font-variant-numeric: tabular-nums;
}

.telemetry-item#stat-ping .tele-val {
  color: var(--terracotta);
}

.telemetry-item#stat-jitter .tele-val {
  color: var(--terracotta);
}

.telemetry-item#stat-loss .tele-val {
  color: var(--deep-olive);
}

.tele-unit {
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--text-dim);
  margin-left: 1px;
}

.telemetry-divider {
  width: 1px;
  height: 14px;
  background: var(--border-subtle);
}

.status-tele {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.status-name {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-muted);
}

.status-dot {
  width: 6px;
  height: 6px;
  background: var(--text-dim);
  border-radius: 50%;
  transition: all 0.3s ease;
}

.status-dot.active {
  background: var(--sage-green);
  box-shadow: 0 0 8px var(--sage-green);
  animation: pulse-ring 1.8s infinite;
}

@keyframes pulse-ring {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
}

/* Alert Banner */
.alert-banner {
  width: 100%;
  background: rgba(189, 68, 68, 0.12);
  border: 1px solid rgba(189, 68, 68, 0.3);
  border-radius: 12px;
  padding: 0.75rem 1rem;
  margin-bottom: 1.2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--terracotta);
  font-size: 0.82rem;
}

.alert-banner.hidden {
  display: none !important;
}

.alert-close {
  background: transparent;
  border: none;
  color: var(--terracotta);
  font-size: 1.2rem;
  cursor: pointer;
}

/* ==========================================================================
   Circular Speedometer Gauge (Smooth Eased Animation & Glow)
   ========================================================================== */
.gauge-container {
  position: relative;
  width: 100%;
  max-width: 340px;
  height: 310px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 2.25rem;
  transition: transform 300ms ease;
}

.gauge-container.running .gauge-track-bg {
  animation: gauge-glow-pulse 2.2s infinite ease-in-out;
}

.gauge-container.running #gauge-needle {
  filter: drop-shadow(0 0 6px var(--terracotta));
}

@keyframes gauge-glow-pulse {
  0%, 100% {
    filter: drop-shadow(0 0 2px rgba(189, 68, 68, 0.15));
  }
  50% {
    filter: drop-shadow(0 0 10px rgba(189, 68, 68, 0.35));
  }
}

.gauge-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.gauge-track-bg {
  stroke: var(--track-bg);
  transition: stroke 0.3s ease, filter 0.3s ease;
}

.gauge-ticks {
  transition: opacity 0.3s ease;
}

.needle-pivot-outer {
  fill: var(--needle-pivot);
  transition: fill 0.3s ease;
}

/* Scale Numbers Inside the Ring */
.scale-labels text {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 600;
  fill: var(--deep-olive);
  letter-spacing: 0.3px;
  user-select: none;
  transition: fill 0.3s ease;
}

/* Needle with Spring-Eased Cubic-Bezier Over 500ms */
.gauge-needle {
  transform-box: view-box;
  transform-origin: 150px 140px;
  transition: transform 500ms cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}

#gauge-progress-arc {
  transition: stroke-dashoffset 500ms cubic-bezier(0.22, 1, 0.36, 1);
  will-change: stroke-dashoffset;
}

/* Center-Bottom Digital Readout */
.gauge-readout {
  position: absolute;
  bottom: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  pointer-events: none;
}

.speed-number {
  font-family: var(--font-display);
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1;
  color: var(--charcoal);
  letter-spacing: -0.6px;
  font-feature-settings: 'tnum' on, 'cv02' on;
  transition: color 0.2s ease;
  display: inline-block;
}

/* Micro-Interaction: Lock-in Pop Animation */
.lock-in {
  animation: lock-in-pop 380ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes lock-in-pop {
  0% {
    transform: scale(0.92);
    opacity: 0.7;
  }
  50% {
    transform: scale(1.08);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.speed-unit {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.3rem;
  letter-spacing: 0.4px;
}

.unit-icon {
  color: var(--sage-green);
  font-weight: 800;
  transition: color 250ms ease;
}

/* ==========================================================================
   3. Use-Case Rating Cards (Streaming, Gaming, Video Chat, Browsing)
   ========================================================================== */
.usecase-cards-row {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 2.0rem;
}

.usecase-card {
  background: var(--surface-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  padding: 0.75rem 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all 0.25s cubic-bezier(0.2, 0.8, 0.3, 1);
  cursor: default;
  user-select: none;
}

.usecase-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-active);
  background: var(--surface-hover);
}

.usecase-icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: rgba(103, 126, 97, 0.08);
  color: var(--deep-olive);
  margin-bottom: 0.3rem;
  transition: all 0.2s ease;
}

.usecase-card:hover .usecase-icon-wrap {
  color: var(--terracotta);
  background: rgba(189, 68, 68, 0.12);
}

.usecase-icon {
  width: 16px;
  height: 16px;
  display: block;
}

.usecase-name {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--deep-olive);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-bottom: 0.4rem;
  transition: color 0.2s ease;
}

.usecase-card:hover .usecase-name {
  color: var(--charcoal);
}

/* Rating Dots (5 Dots Underneath) */
.rating-dots {
  display: flex;
  align-items: center;
  gap: 4px;
}

.rating-dot {
  width: 5.5px;
  height: 5.5px;
  border-radius: 50%;
  background: var(--border-subtle);
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.rating-dot.filled {
  background: var(--terracotta);
  box-shadow: 0 0 5px rgba(189, 68, 68, 0.6);
  transform: scale(1.15);
}

/* ==========================================================================
   Action Button (Terracotta Red Pill with Tactile Feedback)
   ========================================================================== */
.main-btn {
  background: var(--terracotta);
  color: #ffffff;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  padding: 0.95rem 3.5rem;
  border-radius: 9999px;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.18s cubic-bezier(0.2, 0.8, 0.3, 1), box-shadow 0.2s ease, opacity 0.2s ease;
  box-shadow: 0 4px 14px rgba(189, 68, 68, 0.3);
  margin-bottom: 2rem;
  position: relative;
  outline: none;
  user-select: none;
}

.main-btn:hover:not(:disabled) {
  background: var(--terracotta-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(189, 68, 68, 0.38);
}

.main-btn:active:not(:disabled) {
  transform: translateY(0) scale(0.98);
  box-shadow: 0 2px 8px rgba(189, 68, 68, 0.25);
}

.main-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: 0 4px 12px rgba(189, 68, 68, 0.15);
}

/* ==========================================================================
   4. Two-Column Footer Section (Connection Details & 5-Star Provider Rating)
   ========================================================================== */
.test-footer-grid {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  background: var(--surface-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  padding: 1.25rem 1.6rem;
  margin-bottom: 2.25rem;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.test-footer-col {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.45rem;
}

.test-footer-col.connection-col .conn-item {
  font-size: 0.8rem;
}

.test-footer-col.connection-col .change-server-link {
  align-self: flex-start;
  margin-top: 0.2rem;
}

.test-footer-col.rating-col {
  border-left: 1px solid var(--border-subtle);
  padding-left: 1.5rem;
}

.provider-rating-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.2rem;
}

.rating-header-label {
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--dark-olive);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.rating-status-text {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--terracotta);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.star-rating-widget {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.star-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--border-subtle);
  cursor: pointer;
  padding: 0.1rem 0.15rem;
  line-height: 1;
  transition: transform 0.18s cubic-bezier(0.2, 0.8, 0.3, 1), color 0.18s ease;
  outline: none;
  user-select: none;
}

.star-btn:hover {
  transform: scale(1.22);
}

.star-btn.hovered,
.star-btn.selected {
  color: var(--terracotta);
  filter: drop-shadow(0 0 6px rgba(189, 68, 68, 0.55));
}

@media (max-width: 600px) {
  .test-footer-grid {
    grid-template-columns: 1fr;
    gap: 1.1rem;
    padding: 1rem;
  }
  .test-footer-col.rating-col {
    border-left: none;
    border-top: 1px solid var(--border-subtle);
    padding-left: 0;
    padding-top: 0.9rem;
  }
}

/* ==========================================================================
   History Section (Clean Minimalist Log)
   ========================================================================== */
.history-section {
  width: 100%;
  max-width: 940px;
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border-subtle);
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.history-title {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.1px;
  color: var(--dark-olive);
}

.clear-btn {
  background: transparent;
  border: none;
  color: var(--deep-olive);
  font-size: 0.74rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.2s ease;
  padding: 0.25rem 0.5rem;
}

.clear-btn:hover {
  color: var(--terracotta);
}

.history-table-wrapper {
  width: 100%;
  overflow-x: hidden;
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  box-shadow: var(--card-shadow);
  background: var(--surface-panel);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.history-table {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.82rem;
}

.history-table th {
  padding: 0.95rem 1.1rem;
  background: rgba(103, 126, 97, 0.06);
  color: var(--deep-olive);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-subtle);
}

.history-table th.th-time { width: 24%; padding-left: 1.4rem; }
.history-table th.th-node { width: 24%; }
.history-table th.th-num { width: 17.3%; text-align: right; }
.history-table th:last-child { padding-right: 1.4rem; }

.history-table td {
  padding: 1.05rem 1.1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--charcoal);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.2s ease;
}

.history-table td:first-child { padding-left: 1.4rem; }
.history-table td:last-child { padding-right: 1.4rem; }

.history-table tbody tr:nth-child(odd) {
  background: #ffffff;
}

.history-table tbody tr:nth-child(even) {
  background: #FBF6EE;
}

.history-table tbody tr:hover {
  background: rgba(189, 68, 68, 0.06);
}

.history-table td.col-time {
  color: var(--text-dim);
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
}

.node-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 5px;
  background: rgba(103, 126, 97, 0.12);
  color: var(--deep-olive);
  letter-spacing: 0.2px;
}

.node-tag.local {
  background: rgba(189, 68, 68, 0.12);
  color: var(--terracotta);
}

.history-table td.col-num {
  text-align: right;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.history-table td.ping-val {
  color: var(--terracotta);
}

.history-table td.dl-val {
  color: var(--sage-green);
}

.history-table td.ul-val {
  color: var(--deep-olive);
}

.unit-mini {
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--text-dim);
  margin-left: 1px;
}

.no-data {
  text-align: center;
  color: var(--text-dim);
  padding: 2.2rem !important;
  font-style: italic;
  font-size: 0.85rem;
}

/* ==========================================================================
   Footer Dev Info
   ========================================================================== */
.dev-info {
  margin-top: 3.5rem;
  width: 100%;
  max-width: 940px;
  display: flex;
  justify-content: center;
  text-align: center;
}

.dev-info-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--deep-olive);
}

.dev-info .dev-tag {
  font-weight: 700;
  letter-spacing: 1px;
  font-size: 0.72rem;
  color: var(--deep-olive);
}

.dev-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.dev-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--deep-olive);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.8px;
  transition: color 0.2s ease, transform 0.2s ease;
}

.dev-links a:hover {
  color: var(--terracotta);
  transform: translateY(-1px);
}

.dev-icon-footer {
  width: 13px;
  height: 13px;
  display: block;
}

/* ==========================================================================
   Dark Mode High-Contrast, Depth, & Energy Glow Enhancements
   ========================================================================== */
[data-theme="dark"] body {
  background-color: #0f0f10;
  background-image: 
    radial-gradient(ellipse 70% 45% at 50% 0%, rgba(214, 79, 79, 0.05) 0%, transparent 75%),
    radial-gradient(ellipse 50% 35% at 50% 100%, rgba(126, 184, 114, 0.04) 0%, transparent 75%);
}

/* Dark Mode Card Elevation & Border Hierarchy */
[data-theme="dark"] .phase-tab,
[data-theme="dark"] .telemetry-strip,
[data-theme="dark"] .connection-quick-info,
[data-theme="dark"] .usecase-card,
[data-theme="dark"] .test-footer-grid,
[data-theme="dark"] .history-table-wrapper,
[data-theme="dark"] .server-pill,
[data-theme="dark"] .dev-top-badge,
[data-theme="dark"] .theme-toggle-pill {
  background: #1a1a1c;
  border: 1px solid rgba(214, 79, 79, 0.15);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45), 0 1px 3px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .header-accent-line {
  background: linear-gradient(90deg, transparent 0%, rgba(214, 79, 79, 0.2) 15%, #d64f4f 50%, rgba(214, 79, 79, 0.2) 85%, transparent 100%);
  opacity: 0.75;
}

/* Dark Mode Centerpiece "GO" Dial */
[data-theme="dark"] .go-circle-btn {
  background: #1a1a1c;
  border: 4px solid #d64f4f;
  box-shadow: 0 0 0 14px rgba(214, 79, 79, 0.15), 0 16px 45px rgba(0, 0, 0, 0.7), 0 0 30px rgba(214, 79, 79, 0.22);
}

[data-theme="dark"] .go-circle-btn:hover {
  border-color: #e05e5e;
  box-shadow: 0 0 0 20px rgba(214, 79, 79, 0.25), 0 20px 60px rgba(0, 0, 0, 0.85), 0 0 45px rgba(214, 79, 79, 0.4);
}

[data-theme="dark"] .go-text {
  color: #ffffff;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] .go-circle-btn:hover .go-text {
  color: #d64f4f;
}

/* Dark Mode Mode Toggles */
[data-theme="dark"] .mode-pill {
  background: #1a1a1c;
  border: 1px solid rgba(134, 163, 126, 0.4);
  color: #a0a0a0;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
}

[data-theme="dark"] .mode-pill:hover {
  color: #ffffff;
  background: #242427;
  border-color: #d64f4f;
}

[data-theme="dark"] .mode-pill.active {
  color: #ffffff;
  background: #d64f4f;
  border-color: #d64f4f;
  box-shadow: 0 4px 16px rgba(214, 79, 79, 0.45);
}

/* Dark Mode Live Center Speedometer Gauge Glow & High Contrast */
[data-theme="dark"] .gauge-track-bg {
  stroke: #232326;
  filter: drop-shadow(0 0 4px rgba(0, 0, 0, 0.6));
}

[data-theme="dark"] #gauge-progress-arc {
  filter: drop-shadow(0 0 10px rgba(214, 79, 79, 0.75)) drop-shadow(0 0 16px rgba(126, 184, 114, 0.45));
}

[data-theme="dark"] .gauge-container.running .gauge-track-bg {
  animation: gauge-glow-pulse-dark 2.2s infinite ease-in-out;
}

@keyframes gauge-glow-pulse-dark {
  0%, 100% {
    filter: drop-shadow(0 0 4px rgba(214, 79, 79, 0.25));
  }
  50% {
    filter: drop-shadow(0 0 16px rgba(214, 79, 79, 0.75));
  }
}

[data-theme="dark"] #gauge-needle {
  filter: drop-shadow(0 0 10px #d64f4f) drop-shadow(0 0 4px rgba(255, 255, 255, 0.4));
}

[data-theme="dark"] .speed-number {
  color: #ffffff;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .scale-labels text {
  fill: #a0a0a0;
  font-weight: 700;
}

/* Dark Mode Use-Case Icons with Soft Accent Background Circles */
[data-theme="dark"] .usecase-icon-wrap {
  background: rgba(126, 184, 114, 0.16);
  color: #7eb872;
  border: 1px solid rgba(126, 184, 114, 0.25);
  border-radius: 50%;
}

[data-theme="dark"] .usecase-card:hover .usecase-icon-wrap {
  background: rgba(214, 79, 79, 0.25);
  color: #d64f4f;
  border-color: rgba(214, 79, 79, 0.45);
}

[data-theme="dark"] .usecase-name {
  color: #a0a0a0;
}

[data-theme="dark"] .usecase-card:hover .usecase-name {
  color: #ffffff;
}

[data-theme="dark"] .rating-dot {
  background: rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] .rating-dot.filled {
  background: #d64f4f;
  box-shadow: 0 0 8px rgba(214, 79, 79, 0.85);
}

/* Dark Mode Action Button & Star Ratings */
[data-theme="dark"] .main-btn {
  background: #d64f4f;
  box-shadow: 0 4px 18px rgba(214, 79, 79, 0.45);
}

[data-theme="dark"] .main-btn:hover:not(:disabled) {
  background: #e05e5e;
  box-shadow: 0 6px 24px rgba(214, 79, 79, 0.6);
}

[data-theme="dark"] .star-btn.hovered,
[data-theme="dark"] .star-btn.selected {
  color: #d64f4f;
  filter: drop-shadow(0 0 8px rgba(214, 79, 79, 0.75));
}

/* Dark Mode History Table */
[data-theme="dark"] .history-table th {
  background: #151517;
  color: #a0a0a0;
  border-bottom: 1px solid rgba(214, 79, 79, 0.2);
}

[data-theme="dark"] .history-table tbody tr:nth-child(odd) {
  background: #1a1a1c;
}

[data-theme="dark"] .history-table tbody tr:nth-child(even) {
  background: #141416;
}

[data-theme="dark"] .history-table tbody tr:hover {
  background: rgba(214, 79, 79, 0.12);
}

[data-theme="dark"] .history-table td {
  color: #f5f5f5;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .history-table td.col-time {
  color: #888888;
}

[data-theme="dark"] .history-table td.dl-val {
  color: #7eb872;
}

[data-theme="dark"] .history-table td.ul-val {
  color: #86a37e;
}

[data-theme="dark"] .history-table td.ping-val {
  color: #d64f4f;
}

[data-theme="dark"] .node-tag {
  background: rgba(126, 184, 114, 0.18);
  color: #7eb872;
}

[data-theme="dark"] .node-tag.local {
  background: rgba(214, 79, 79, 0.22);
  color: #d64f4f;
}

/* ==========================================================================
   Mobile Responsiveness & Viewport Scalability
   ========================================================================== */
@media (max-width: 600px) {
  body {
    padding: 1.5rem 0.75rem 2rem;
  }

  .app-card {
    padding: 1.5rem 1.0rem;
    border-radius: 20px;
  }

  .app-nav {
    margin-bottom: 1.25rem;
  }

  .header-accent-line {
    margin-bottom: 1.25rem;
  }

  /* Idle View Mobile */
  .go-dial-wrapper {
    width: 175px;
    height: 175px;
    margin: 0.75rem 0 1.25rem;
  }

  .go-circle-btn {
    width: 155px;
    height: 155px;
  }

  .go-text {
    font-size: 2.35rem;
  }

  .connection-quick-info {
    font-size: 0.74rem;
    padding: 0.65rem 0.85rem;
    gap: 0.45rem;
  }

  /* Test View Mobile */
  .phases-tabs-row {
    gap: 0.6rem;
    margin-bottom: 1.0rem;
  }

  .phase-tab {
    padding: 0.75rem 0.6rem;
  }

  .phase-tab-val {
    font-size: 1.4rem;
  }

  .telemetry-strip {
    padding: 0.5rem 0.65rem;
    margin-bottom: 1.0rem;
    gap: 0.35rem;
  }

  .tele-label {
    font-size: 0.65rem;
  }

  .tele-val {
    font-size: 0.78rem;
  }

  .gauge-container {
    max-width: 260px;
    height: 240px;
    margin-bottom: 1.25rem;
  }

  .speed-number {
    font-size: 2.1rem;
  }

  /* Use-Case Cards Mobile */
  .usecase-cards-row {
    gap: 0.35rem;
    margin-bottom: 1.25rem;
  }

  .usecase-card {
    padding: 0.5rem 0.25rem;
    min-width: 0;
  }

  .usecase-icon-wrap {
    width: 22px;
    height: 22px;
  }

  .usecase-icon {
    width: 13px;
    height: 13px;
  }

  .usecase-name {
    font-size: 0.58rem;
    letter-spacing: 0.2px;
    margin-bottom: 0.25rem;
  }

  .rating-dot {
    width: 4px;
    height: 4px;
  }

  /* Two-Column Footer Grid Stack */
  .test-footer-grid {
    grid-template-columns: 1fr;
    gap: 1.0rem;
    padding: 1.0rem;
    margin-bottom: 1.25rem;
  }

  .test-footer-col.rating-col {
    border-left: none;
    border-top: 1px solid var(--border-subtle);
    padding-left: 0;
    padding-top: 0.85rem;
  }

  .main-btn {
    width: 100%;
    padding: 0.8rem 1.5rem;
  }

  .history-table th,
  .history-table td {
    padding: 0.5rem 0.35rem;
    font-size: 0.72rem;
  }
}

@media (max-width: 380px) {
  .usecase-cards-row {
    display: flex;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    padding-bottom: 4px;
  }

  .usecase-card {
    flex: 0 0 72px;
    scroll-snap-align: start;
  }

  .tele-label {
    display: none;
  }
}