/* =========================================================
   ISP Speed Test — Stylesheet
   Design tokens
   Palette:
     --bg          #070B14  deep signal-navy background
     --bg-2        #0B111F  secondary background stop (mesh gradient)
     --panel       #111A2C  card surface
     --panel-2     #16233B  raised surface / hover
     --line        #223252  hairline borders
     --text        #EAF0FB  primary text
     --text-dim    #8B96AF  secondary text
     --accent      #34E1B0  live/active signal (mint)
     --accent-2    #5B8CFF  secondary gradient stop (electric blue)
     --danger      #FF6B6B  errors
   Type:
     Space Grotesk — big numeric readouts (tabular, technical character)
     Inter         — UI text, labels, body
   ========================================================= */

:root {
  --bg: #070B14;
  --bg-2: #0B111F;
  --panel: #111A2C;
  --panel-2: #16233B;
  --line: #223252;
  --text: #EAF0FB;
  --text-dim: #8B96AF;
  --accent: #34E1B0;
  --accent-2: #5B8CFF;
  --danger: #FF6B6B;
  --warn: #F5B14C;

  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;

  --max-content: 640px;
  --shadow-card: 0 30px 70px -30px rgba(0, 0, 0, 0.55);

  color-scheme: dark;
}

html[data-theme="light"] {
  --bg: #F1F4FB;
  --bg-2: #E7ECF8;
  --panel: #FFFFFF;
  --panel-2: #EEF2FA;
  --line: #DCE3F0;
  --text: #101728;
  --text-dim: #5B6478;
  --accent: #0FAE81;
  --accent-2: #3D63E0;
  --danger: #D6483F;
  --warn: #B87A1A;
  --shadow-card: 0 30px 70px -35px rgba(16, 23, 40, 0.25);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  overflow-x: hidden;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  transition: background-color .3s ease, color .3s ease;
  position: relative;
}

/* Ambient backdrop: soft signal-glow mesh + slow-drifting pulse rings,
   evoking fiber/network activity without being loud or decorative-for-
   its-own-sake. Disabled entirely under reduced motion. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 18% -8%, rgba(52, 225, 176, 0.14), transparent 42%),
    radial-gradient(circle at 88% 6%, rgba(91, 140, 255, 0.14), transparent 40%),
    radial-gradient(circle at 50% 115%, rgba(91, 140, 255, 0.08), transparent 50%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
  pointer-events: none;
}

.noise {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

html[data-theme="light"] .noise {
  opacity: 0.02;
}

button {
  font-family: inherit;
}

.page {
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: clamp(20px, 5vw, 56px) clamp(16px, 5vw, 24px) clamp(28px, 6vw, 48px);
}

/* ---------------- Brand header ---------------- */

.brand {
  width: 100%;
  max-width: var(--max-content);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: clamp(18px, 4vw, 30px);
}

.company-logo {
  display: block;
  width: auto;
  height: auto;
  max-width: min(220px, 60vw);
  max-height: 88px;
  object-fit: contain;
  margin-bottom: 16px;
}

.company-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.2rem, 3.4vw, 1.55rem);
  letter-spacing: -0.015em;
  margin: 0;
}

.tagline {
  margin: 5px 0 0;
  color: var(--text-dim);
  font-size: clamp(0.85rem, 2.4vw, 0.95rem);
}

/* ---------------- Server info ---------------- */

.server-info {
  width: 100%;
  max-width: var(--max-content);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: clamp(24px, 5vw, 34px);
  padding: 8px 18px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--panel) 55%, transparent);
  border: 1px solid var(--line);
  color: var(--text-dim);
  font-size: 0.83rem;
  flex-wrap: wrap;
  width: fit-content;
  max-width: calc(100% - 32px);
}

.server-info__pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(52, 225, 176, 0.5);
  animation: pulseDot 2.4s ease-out infinite;
  flex-shrink: 0;
}

@keyframes pulseDot {
  0% { box-shadow: 0 0 0 0 rgba(52, 225, 176, 0.45); }
  70% { box-shadow: 0 0 0 8px rgba(52, 225, 176, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 225, 176, 0); }
}

.server-info__item {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.server-info__label {
  color: var(--text-dim);
}

.server-info__value {
  color: var(--text);
  font-weight: 500;
}

.server-info__divider {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--line);
}

/* ---------------- Main test card ---------------- */

.test-card {
  width: 100%;
  max-width: var(--max-content);
  background: linear-gradient(180deg, var(--panel) 0%, color-mix(in srgb, var(--panel) 92%, var(--bg-2) 8%) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 5vw, 48px) clamp(18px, 5vw, 40px) clamp(32px, 5vw, 46px);
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  box-shadow: var(--shadow-card);
}

/* ---------------- Gauge ---------------- */

.gauge-wrap {
  position: relative;
  width: min(280px, 62vw);
  height: min(280px, 62vw);
  min-width: 200px;
  min-height: 200px;
  margin-bottom: clamp(18px, 4vw, 24px);
}

.gauge {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
  overflow: visible;
}

.gauge__ticks {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 1 11.28; /* 60 evenly spaced tick marks around r=150 */
  opacity: 0.9;
}

.gauge__track {
  fill: none;
  stroke: var(--panel-2);
  stroke-width: 10;
}

.gauge__progress {
  fill: none;
  stroke: var(--accent);
  stroke: url(#gaugeGradient);
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 829.4; /* 2 * PI * 132 */
  stroke-dashoffset: 829.4;
  transition: stroke-dashoffset .25s ease;
  filter: drop-shadow(0 0 10px rgba(52, 225, 176, 0.35));
}

.gauge__button {
  position: absolute;
  inset: 20px;
  border-radius: 50%;
  border: none;
  background: radial-gradient(circle at 50% 38%, var(--panel-2) 0%, color-mix(in srgb, var(--panel-2) 88%, black 6%) 100%);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .25s ease;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.04),
    0 0 0 0 rgba(52, 225, 176, 0);
}

.gauge__button:hover:not(:disabled) {
  transform: scale(1.015);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 0 0 10px rgba(52, 225, 176, 0.07);
}

.gauge__button:active:not(:disabled) {
  transform: scale(0.99);
}

.gauge__button:disabled {
  cursor: default;
}

.gauge__button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 6px;
}

.gauge__stage {
  font-family: var(--font-display);
  font-size: clamp(1rem, 3vw, 1.15rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: color .2s ease;
}

.gauge__value {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 9vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  min-height: 1em;
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gauge__unit {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 500;
}

.test-card.is-running .gauge__stage {
  color: var(--text-dim);
}

/* ---------------- Live pulse chart (shown during download/upload) ---------------- */

.pulse-wrap {
  width: 100%;
  height: 56px;
  margin-bottom: 18px;
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  overflow: hidden;
  position: relative;
}

.pulse-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, transparent 85%, var(--panel-2) 100%);
  pointer-events: none;
}

.pulse {
  width: 100%;
  height: 100%;
  display: block;
}

.pulse polyline {
  stroke: url(#gaugeGradient);
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}

/* ---------------- Metrics row ---------------- */

.metrics-row {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 4px;
}

.metric {
  background: var(--panel-2);
  border-radius: var(--radius-sm);
  padding: 13px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
  border: 1px solid transparent;
  transition: border-color .2s ease, transform .2s ease;
}

.metric.is-active {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.metric__label {
  font-size: 0.72rem;
  color: var(--text-dim);
  font-weight: 500;
}

.metric__value {
  font-family: var(--font-display);
  font-size: clamp(1rem, 3.4vw, 1.25rem);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.metric__value small {
  font-family: var(--font-body);
  font-size: 0.62em;
  color: var(--text-dim);
  font-weight: 500;
  margin-left: 3px;
}

/* ---------------- Results ---------------- */

.results {
  width: 100%;
  margin-top: clamp(24px, 5vw, 32px);
  padding-top: clamp(20px, 4vw, 28px);
  border-top: 1px solid var(--line);
  animation: resultsIn .45s ease;
}

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

.results__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.results__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0;
}

.quality-badge {
  font-size: 0.76rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  white-space: nowrap;
}

.quality-badge[data-tier="fair"] {
  background: color-mix(in srgb, var(--warn) 16%, transparent);
  color: var(--warn);
  border-color: color-mix(in srgb, var(--warn) 35%, transparent);
}

.quality-badge[data-tier="poor"] {
  background: color-mix(in srgb, var(--danger) 14%, transparent);
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 32%, transparent);
}

.results__bars {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.results__bar-row {
  display: grid;
  grid-template-columns: 70px 1fr;
  align-items: center;
  gap: 12px;
}

.results__bar-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  font-weight: 500;
}

.results__bar-track {
  height: 8px;
  border-radius: 999px;
  background: var(--panel-2);
  overflow: hidden;
}

.results__bar-fill {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: 999px;
  transition: width .8s cubic-bezier(.22, .9, .3, 1);
}

.results__bar-fill--dl {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.results__bar-fill--ul {
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
}

.results__grid {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.results__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 0.92rem;
}

.results__row:last-child {
  border-bottom: none;
}

.results__row dt {
  color: var(--text-dim);
}

.results__row dd {
  margin: 0;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.results__actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.btn {
  flex: 1 1 auto;
  min-width: 140px;
  padding: 13px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform .15s ease, background-color .2s ease, border-color .2s ease, filter .2s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #06140F;
}

.btn--primary:hover {
  filter: brightness(1.06);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}

.btn--ghost:hover {
  background: var(--panel-2);
}

.results__note {
  margin: 10px 0 0;
  font-size: 0.82rem;
  color: var(--accent);
  text-align: center;
}

/* ---------------- Error banner ---------------- */

.error-banner {
  width: 100%;
  margin-top: 18px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid rgba(255, 107, 107, 0.35);
  color: var(--danger);
  font-size: 0.85rem;
  text-align: center;
}

/* ---------------- Footer ---------------- */

.page-footer {
  margin-top: clamp(24px, 5vw, 36px);
  color: var(--text-dim);
  font-size: 0.78rem;
  text-align: center;
}

/* =========================================================
   Responsive breakpoints
   ========================================================= */

@media (min-width: 640px) {
  .metrics-row {
    gap: 14px;
  }
}

/* Desktop: premium wide-screen feel */
@media (min-width: 1024px) {
  :root {
    --max-content: 700px;
  }
  .test-card {
    padding: 52px 60px 56px;
  }
  .gauge-wrap {
    width: 300px;
    height: 300px;
  }
}

/* Mobile portrait */
@media (max-width: 480px) {
  .metrics-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .company-logo {
    max-width: 170px;
  }
  .results__bar-row {
    grid-template-columns: 60px 1fr;
  }
}

/* Mobile landscape: shorter viewport height, tighten vertical rhythm */
@media (orientation: landscape) and (max-height: 480px) {
  .page {
    padding-top: 14px;
    padding-bottom: 20px;
  }
  .brand {
    margin-bottom: 10px;
  }
  .company-logo {
    max-height: 44px;
    margin-bottom: 6px;
  }
  .tagline {
    display: none;
  }
  .server-info {
    margin-bottom: 14px;
  }
  .gauge-wrap {
    width: 190px;
    height: 190px;
    min-width: 170px;
    min-height: 170px;
    margin-bottom: 12px;
  }
  .pulse-wrap {
    height: 40px;
    margin-bottom: 12px;
  }
  .test-card {
    padding: 22px 20px 26px;
  }
}

/* =========================================================
   Iframe / embed mode
   ========================================================= */

body.iframe-mode .page {
  padding: 16px 12px 20px;
}

body.iframe-mode .test-card {
  border-radius: var(--radius-md);
}

body.iframe-mode.no-branding .brand,
body.iframe-mode.no-branding .page-footer {
  display: none;
}

body.iframe-mode.no-branding .page {
  padding-top: 16px;
}

/* =========================================================
   Accessibility
   ========================================================= */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .server-info__pulse {
    animation: none;
  }
}