:root {
  --bg:       #0A0E14;
  --bg-2:     #12171F;
  --bg-3:     #1A212C;
  --border:   rgba(255, 255, 255, 0.07);
  --border-2: rgba(255, 255, 255, 0.13);
  --text:     #E8EBF0;
  --text-dim: #8B93A3;
  --accent:   #60A5FA;
  --accent-2: #34D399;
  --accent-3: #8B5CF6;
  --accent-4: #EC4899;
  --shadow:   0 12px 36px rgba(0, 0, 0, 0.35);
  --glow:     0 0 40px rgba(96, 165, 250, 0.18);
}

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

html, body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(96, 165, 250, 0.10), transparent 60%),
    radial-gradient(900px 500px at 85% 20%, rgba(139, 92, 246, 0.10), transparent 60%),
    radial-gradient(800px 500px at 50% 120%, rgba(52, 211, 153, 0.06), transparent 60%),
    var(--bg);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

::selection { background: rgba(96, 165, 250, 0.35); color: #fff; }

/* ===== nav ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: linear-gradient(180deg, rgba(10, 14, 20, 0.7), rgba(10, 14, 20, 0.3));
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
}

.brand svg { display: block; }

.nav nav {
  display: flex;
  gap: 28px;
}

.nav nav a {
  color: var(--text-dim);
  font-size: 0.93rem;
  transition: color 0.2s ease;
  position: relative;
}

.nav nav a:hover { color: var(--text); }

.nav nav a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.25s ease;
  border-radius: 2px;
}

.nav nav a:hover::after { width: 100%; }

@media (max-width: 540px) {
  .nav { padding: 16px 20px; }
  .nav nav { gap: 16px; }
  .nav nav a:last-child { display: none; }
}

/* ===== main ===== */
main {
  flex: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 32px 80px;
  width: 100%;
}

@media (max-width: 540px) {
  main { padding: 16px 16px 60px; }
}

.hero { text-align: center; }

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-dim);
  padding: 6px 14px;
  border: 1px solid var(--border-2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  margin-bottom: 24px;
  letter-spacing: 0.01em;
}

.hero-pill::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 8px var(--accent-2);
  animation: pulse 2s ease-in-out infinite;
  margin-right: 2px;
}

.hero-pill > :first-child { display: none; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  font-weight: 800;
  background: linear-gradient(135deg, #F3F4F7 0%, #C7CCD6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 12px;
  letter-spacing: -0.03em;
  line-height: 1.08;
}

.subtitle {
  color: var(--text-dim);
  font-size: clamp(0.95rem, 1.5vw, 1.08rem);
  margin-bottom: 40px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== tester card ===== */
.tester {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.02) 100%);
  border: 1px solid var(--border-2);
  border-radius: 24px;
  padding: 44px 32px 40px;
  max-width: 600px;
  margin: 0 auto;
  box-shadow: var(--shadow), var(--glow);
  position: relative;
  overflow: hidden;
}

.tester::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.18) 50%,
    transparent 100%);
}

.gauge-wrap {
  position: relative;
  margin: 0 auto 16px;
  max-width: 420px;
}

.gauge {
  width: 100%;
  height: auto;
  display: block;
}

.gauge-fg { transition: stroke-dasharray 0.35s cubic-bezier(0.4, 0, 0.2, 1); }

.gauge-center {
  position: absolute;
  left: 50%;
  top: 62%;
  transform: translate(-50%, -50%);
  text-align: center;
  pointer-events: none;
}

.gauge-phase {
  font-size: 0.72rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: 6px;
  font-weight: 600;
}

.gauge-value {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  font-size: clamp(2.6rem, 8vw, 3.8rem);
}

.gauge-value small {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-dim);
  margin-left: 6px;
  letter-spacing: 0;
}

/* ===== start button ===== */
.start-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, #60A5FA 0%, #8B5CF6 100%);
  color: #fff;
  border: none;
  padding: 14px 36px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.2s ease;
  box-shadow: 0 6px 24px rgba(96, 165, 250, 0.35),
              inset 0 1px 0 rgba(255, 255, 255, 0.2);
  font-family: inherit;
  margin-top: 8px;
  position: relative;
  overflow: hidden;
}

.start-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 10px 32px rgba(96, 165, 250, 0.5),
              inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

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

.start-btn:disabled {
  opacity: 0.65;
  cursor: progress;
  transform: none;
}

.start-icon {
  font-size: 0.8em;
  line-height: 1;
}

/* ===== progress bar ===== */
.progress-bar {
  max-width: 320px;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  overflow: hidden;
  margin: 24px auto 0;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.progress-bar.active { opacity: 1; }

.progress-fg {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-3), var(--accent-4));
  border-radius: 999px;
  transition: width 0.3s ease;
}

/* ===== result cards ===== */
.results {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 32px auto 0;
  max-width: 900px;
}

.result-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 18px 20px;
  text-align: left;
  transition: border-color 0.3s ease, transform 0.2s ease;
}

.result-card.active {
  border-color: rgba(96, 165, 250, 0.35);
}

.result-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 8px;
  font-weight: 500;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-label .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.result-card.active .result-label .dot {
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

.result-card.done .result-label .dot {
  background: var(--accent-2);
}

.result-value {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.result-value small {
  font-size: 0.72rem;
  color: var(--text-dim);
  font-weight: 500;
  margin-left: 4px;
  letter-spacing: 0;
}

@media (max-width: 640px) {
  .results {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .result-value { font-size: 1.4rem; }
}

/* ===== meta row ===== */
.meta {
  display: flex;
  gap: 32px;
  justify-content: center;
  margin-top: 36px;
  flex-wrap: wrap;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.meta-item span {
  opacity: 0.55;
  margin-right: 8px;
  font-weight: 500;
}

/* ===== feature sections ===== */
.feature-section {
  margin-top: 120px;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.feature-section.compact { margin-top: 80px; }

.feature-section h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 36px;
  letter-spacing: -0.03em;
  text-align: center;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.step {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 28px 26px;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.step:hover {
  transform: translateY(-2px);
  border-color: var(--border-2);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  background: linear-gradient(135deg, rgba(96, 165, 250, 0.18), rgba(52, 211, 153, 0.15));
  border: 1px solid rgba(96, 165, 250, 0.3);
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
}

.step h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.step p {
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.65;
}

@media (max-width: 768px) {
  .steps { grid-template-columns: 1fr; }
}

/* ===== FAQ ===== */
#faq details {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 10px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

#faq details[open] { border-color: var(--border-2); }

#faq summary {
  padding: 18px 56px 18px 22px;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  position: relative;
  transition: color 0.2s ease;
  font-size: 0.98rem;
}

#faq summary::-webkit-details-marker { display: none; }

#faq summary::after {
  content: '';
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--text-dim);
  border-bottom: 2px solid var(--text-dim);
  transform-origin: center;
  transform: translateY(-50%) rotate(45deg);
  transition: transform 0.25s ease, border-color 0.2s ease;
}

#faq details[open] summary::after {
  transform: translateY(-25%) rotate(-135deg);
  border-color: var(--accent);
}

#faq summary:hover { color: var(--accent); }

#faq details p {
  padding: 0 22px 22px;
  color: var(--text-dim);
  font-size: 0.93rem;
  line-height: 1.7;
}

/* ===== privacy ===== */
#privacy .lead {
  font-size: 1.05rem;
  color: var(--text-dim);
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  line-height: 1.75;
}

/* ===== footer ===== */
footer {
  border-top: 1px solid var(--border);
  margin-top: 120px;
  padding: 40px 32px;
  background: rgba(10, 14, 20, 0.6);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 0.88rem;
  color: var(--text-dim);
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--text);
}

.footer-links {
  display: flex;
  gap: 22px;
}

.footer-links a {
  color: var(--text-dim);
  transition: color 0.2s ease;
}

.footer-links a:hover { color: var(--text); }