/* ============ Tokens ============ */
:root{
  --bg: #FFFFFF;
  --bg-soft: #F5F6FA;
  --bg-deep: #ECEEF5;
  --ink: #12141C;
  --ink-soft: #565B6B;
  --ink-faint: #9498A6;
  --accent: #3654FF;
  --accent-deep: #2540D6;
  --accent-soft: #E9EDFF;
  --success: #14957F;
  --error: #D8402F;
  --border: rgba(18,20,28,0.10);
  --shadow: rgba(18,20,28,0.08);

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
}

*{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

body{
  margin:0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

a, button{ font-family: inherit; }

:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============ Header ============ */
.site-header{
  display:flex;
  align-items:center;
  justify-content: space-between;
  padding: 26px clamp(20px, 6vw, 72px);
  max-width: 1100px;
  margin: 0 auto;
}
.brand{
  display:flex;
  align-items:center;
  gap: 10px;
}
.brand-mark{
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: var(--accent);
  display:inline-block;
  transform: rotate(45deg);
}
.brand-name{
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.level-tabs{
  display:flex;
  gap: 4px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px;
}
.level-tab{
  border: none;
  background: transparent;
  color: var(--ink-soft);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.level-tab:hover{ color: var(--ink); }
.level-tab.is-active{
  background: var(--ink);
  color: #fff;
}

/* ============ Hero ============ */
.hero{
  max-width: 900px;
  margin: 0 auto;
  padding: 40px clamp(20px, 6vw, 24px) 0;
  text-align: center;
}
.eyebrow{
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 16px;
}
.title{
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5.5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}
.subtitle{
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.65;
}

/* ============ Stat row ============ */
.stat-row{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}
.stat-card{
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 8px;
  text-align: center;
}
.stat-value{
  display:block;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.stat-label{
  display:block;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 4px;
}

/* ============ Typing panel ============ */
.typing-panel{
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(22px, 4vw, 40px);
  box-shadow: 0 24px 48px -32px var(--shadow);
  text-align: left;
}

.text-wrap{
  position: relative;
}

.text-display{
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 2;
  letter-spacing: 0.01em;
  color: var(--ink-faint);
  user-select: none;
  cursor: text;
}

.click-overlay{
  position: absolute;
  inset: 0;
  display:flex;
  align-items:center;
  justify-content:center;
  gap: 10px;
  width: 100%;
  border: 1.5px dashed var(--accent);
  border-radius: var(--radius-sm);
  background: rgba(245, 246, 250, 0.92);
  backdrop-filter: blur(2px);
  color: var(--accent-deep);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s ease, background 0.2s ease;
  z-index: 2;
}
.click-overlay:hover{
  background: rgba(233,237,255,0.95);
}
.click-overlay-icon{
  font-size: 1.15rem;
  transform: translateY(-1px);
}
.click-overlay.is-hidden{
  opacity: 0;
  pointer-events: none;
}
.text-display span.ch{
  transition: color 0.1s ease, background 0.1s ease;
  border-radius: 2px;
}
.text-display span.correct{ color: var(--ink); }
.text-display span.incorrect{
  color: var(--error);
  background: rgba(216,64,47,0.10);
}
.text-display span.current{
  background: var(--accent-soft);
  color: var(--ink);
  animation: cursor-pulse 1.1s ease-in-out infinite;
}
@keyframes cursor-pulse{
  0%, 100%{ background: var(--accent-soft); }
  50%{ background: rgba(233,237,255,0.4); }
}

.type-input{
  position: absolute;
  opacity: 0;
  pointer-events: none;
  height: 1px;
  width: 1px;
}

/* Tempo strip: live speed visualizer, the signature element */
.tempo-strip{
  display:flex;
  align-items: flex-end;
  gap: 3px;
  height: 40px;
  margin: 24px 0;
  padding: 0 2px;
}
.tempo-bar{
  flex: 1 1 auto;
  min-width: 3px;
  max-width: 6px;
  border-radius: 2px;
  background: var(--bg-deep);
  transition: height 0.18s ease, background 0.18s ease;
}
.tempo-bar.active{ background: var(--accent); }

.panel-footer{
  display:flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.hint{
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin: 0;
}

.btn-primary{
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 999px;
  padding: 10px 22px;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}
.btn-primary:hover{
  background: var(--accent);
  border-color: var(--accent);
}
.btn-primary:active{ transform: scale(0.97); }

/* ============ Content sections ============ */
.content-section{
  padding: 96px clamp(20px, 6vw, 24px);
}
.content-section.alt{
  background: var(--bg-soft);
}
.section-inner{
  max-width: 900px;
  margin: 0 auto;
}
.section-eyebrow{
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 14px;
}
.section-title{
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.6vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  max-width: 640px;
}
.section-lead{
  font-size: 1.02rem;
  color: var(--ink-soft);
  max-width: 620px;
  line-height: 1.7;
  margin: 0 0 44px;
}

.fact-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.fact-card{
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  background: var(--bg);
}
.fact-value{
  display:block;
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 10px;
}
.fact-caption{
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

.tip-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 44px;
}
.tip-card{
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px 22px;
}
.tip-card h3{
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 10px;
}
.tip-card p{
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.6;
  margin: 0;
}

.level-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 44px;
}
.level-card{
  text-align: left;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.15s ease;
}
.level-card:hover{
  border-color: var(--accent);
  transform: translateY(-2px);
}
.level-name{
  display:block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 10px;
}
.level-card p{
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.6;
  margin: 0;
}

/* ============ Result overlay ============ */
.result-overlay{
  position: fixed;
  inset: 0;
  background: rgba(18,20,28,0.4);
  backdrop-filter: blur(3px);
  display:flex;
  align-items:center;
  justify-content:center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 10;
  padding: 20px;
}
.result-overlay.is-visible{
  opacity: 1;
  pointer-events: auto;
}
.result-card{
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px clamp(24px, 6vw, 48px);
  text-align: center;
  max-width: 420px;
  width: 100%;
  transform: translateY(12px);
  transition: transform 0.3s ease;
  box-shadow: 0 30px 60px -20px rgba(18,20,28,0.35);
}
.result-overlay.is-visible .result-card{ transform: translateY(0); }

.result-eyebrow{
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 10px;
}
.result-title{
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  margin: 0 0 28px;
}
.result-stats{
  display:flex;
  justify-content: center;
  gap: 28px;
  margin-bottom: 28px;
}
.result-stat{ display:flex; flex-direction:column; }
.result-value{
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 600;
}
.result-label{
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 4px;
}

/* ============ Footer ============ */
.site-footer{
  text-align: center;
  padding: 32px 20px 40px;
  font-size: 0.82rem;
  color: var(--ink-faint);
  border-top: 1px solid var(--border);
}

/* ============ Responsive ============ */
@media (max-width: 760px){
  .fact-grid, .tip-grid, .level-grid{ grid-template-columns: 1fr; }
}
@media (max-width: 620px){
  .stat-row{ grid-template-columns: repeat(2, 1fr); }
  .level-tab{ padding: 6px 12px; font-size: 0.78rem; }
  .text-display{ font-size: 1rem; }
  .panel-footer{ flex-direction: column; align-items: flex-start; }
  .site-header{ flex-direction: column; gap: 16px; }
}

/* ============ Reduced motion ============ */
@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}