/* ==========================================================================
   CryptoLab — Design tokens
   ========================================================================== */
:root{
  --bg-0: #0A0E14;
  --bg-1: #10161F;
  --bg-panel: #131A25;
  --bg-panel-alt: #1A2331;
  --border: #23303F;
  --border-soft: #1B2531;

  --text-hi: #ECF2F8;
  --text-mid: #A9B7C6;
  --text-low: #6B7A8C;

  --teal: #5EEAD4;
  --teal-dim: #2C8C7C;
  --amber: #F5A623;
  --amber-dim: #8A5E14;
  --red: #F2685C;

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

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--bg-0);
  color: var(--text-hi);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

a{ color: inherit; text-decoration: none; }
h1, h2, h3{ font-family: var(--font-display); margin: 0; letter-spacing: -0.01em; }
p{ margin: 0; }

.mono, code, .mono-input, .bitbox, .field-hint, .result-box{
  font-family: var(--font-mono);
}

/* faint background grid to reinforce the "matrix / lattice" motif */
.bg-grid{
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(94,234,212,0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(94,234,212,0.045) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 40%, transparent 90%);
}

/* ==========================================================================
   Header / Nav
   ========================================================================== */
.site-header{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px clamp(20px, 5vw, 64px);
  border-bottom: 1px solid var(--border-soft);
}
.brand{
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
}
.brand-mark{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--bg-0);
  background: var(--teal);
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}
.brand-name em{ color: var(--teal); font-style: normal; }

.site-nav{ display: flex; gap: 6px; }
.site-nav a{
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-mid);
  transition: color .15s ease, background .15s ease;
}
.site-nav a:hover{ color: var(--text-hi); background: var(--bg-panel-alt); }
.site-nav a.active{ color: var(--bg-0); background: var(--teal); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero{
  position: relative;
  padding: clamp(56px, 10vw, 120px) clamp(20px, 5vw, 64px) 64px;
  overflow: hidden;
}
.hero-inner{ max-width: 760px; margin: 0 auto; text-align: center; }

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--amber);
  margin-bottom: 18px;
}

.hero-title{
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  font-weight: 700;
  color: var(--text-hi);
  margin-bottom: 22px;
  letter-spacing: 0.01em;
}

.hero-desc{
  color: var(--text-mid);
  font-size: 1.05rem;
  max-width: 620px;
  margin: 0 auto 34px;
}
.hero-desc strong{ color: var(--text-hi); font-weight: 600; }

.hero-actions{ display: flex; justify-content: center; gap: 14px; }

.hero-stream{
  margin: 56px auto 0;
  max-width: 900px;
  height: 40px;
  overflow: hidden;
  font-family: var(--font-mono);
  color: var(--teal-dim);
  font-size: 0.85rem;
  white-space: nowrap;
  opacity: 0.55;
  mask-image: linear-gradient(to right, transparent, black 15%, black 85%, transparent);
}
.hero-stream .stream-line{
  display: inline-block;
  animation: streamscroll 26s linear infinite;
}
@keyframes streamscroll{
  from{ transform: translateX(0); }
  to{ transform: translateX(-50%); }
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .12s ease, background .15s ease, border-color .15s ease;
}
.btn:active{ transform: translateY(1px); }
.btn-primary{ background: var(--teal); color: var(--bg-0); }
.btn-primary:hover{ background: #7FF0DC; }
.btn-ghost{ background: transparent; color: var(--text-mid); border-color: var(--border); }
.btn-ghost:hover{ color: var(--text-hi); border-color: var(--text-mid); }

/* ==========================================================================
   Sections shared
   ========================================================================== */
section{ padding: 48px clamp(20px, 5vw, 64px); max-width: 1180px; margin: 0 auto; }
.section-head{ max-width: 620px; margin-bottom: 34px; }
.section-head h2{ font-size: 1.8rem; margin-bottom: 10px; }
.section-head p{ color: var(--text-mid); }

/* ==========================================================================
   Module grid (landing cards)
   ========================================================================== */
.module-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.module-card{
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform .16s ease, border-color .16s ease, background .16s ease;
}
.module-card:hover{
  transform: translateY(-4px);
  border-color: var(--teal-dim);
  background: var(--bg-panel-alt);
}
.module-card-top{
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.module-tag{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-low);
  letter-spacing: 0.03em;
}
.module-bits{ display: flex; align-items: center; gap: 6px; }
.bitbox{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  padding: 0 4px;
  border: 1px solid var(--teal-dim);
  border-radius: 5px;
  color: var(--teal);
  font-size: 0.75rem;
  font-weight: 600;
}
.bit-label{ font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-low); }

.module-card h3{ font-size: 1.5rem; color: var(--text-hi); }
.module-card p{ color: var(--text-mid); font-size: 0.92rem; flex-grow: 1; }
.module-cta{ font-size: 0.85rem; color: var(--amber); font-weight: 600; }

/* ==========================================================================
   How-it-works
   ========================================================================== */
.how-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.how-step{
  border-left: 2px solid var(--teal-dim);
  padding-left: 16px;
}
.how-index{
  display: block;
  font-family: var(--font-mono);
  color: var(--teal);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  text-transform: uppercase;
}
.how-step p{ color: var(--text-mid); font-size: 0.92rem; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer{
  padding: 28px clamp(20px, 5vw, 64px) 40px;
  text-align: center;
  color: var(--text-low);
  font-size: 0.82rem;
  border-top: 1px solid var(--border-soft);
  margin-top: 40px;
}

/* ==========================================================================
   Module (simulator) page
   ========================================================================== */
.module-page{ padding-top: 40px; }
.module-header{ text-align: center; max-width: 640px; margin: 0 auto 40px; }
.module-header h1{ font-size: clamp(2rem, 5vw, 2.8rem); margin: 6px 0; }
.module-subtitle{ color: var(--text-mid); }

.workspace{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto 24px;
}

.panel{
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px;
}

.field{ margin-bottom: 20px; }
.field label, .field-label-static{
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-hi);
  margin-bottom: 8px;
}
.mono-input{
  width: 100%;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--teal);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  transition: border-color .15s ease;
}
.mono-input:focus{
  outline: none;
  border-color: var(--teal);
}
.mono-input::placeholder{ color: var(--text-low); letter-spacing: normal; font-family: var(--font-body); }
.field-hint{
  display: block;
  margin-top: 6px;
  font-size: 0.72rem;
  color: var(--text-low);
}

.mode-toggle{ display: flex; gap: 8px; }
.mode-option{
  flex: 1;
  position: relative;
  text-align: center;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-mid);
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}
.mode-option input{ position: absolute; opacity: 0; }
.mode-option:has(input:checked){
  border-color: var(--teal);
  color: var(--bg-0);
  background: var(--teal);
  font-weight: 600;
}

.form-actions{ display: flex; gap: 12px; margin-top: 24px; }
.form-error{
  margin-top: 16px;
  color: var(--red);
  font-size: 0.85rem;
}

.result-panel{ display: flex; flex-direction: column; }
.result-head{
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.result-mode-badge{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-low);
}
.result-box{
  flex-grow: 1;
  min-height: 120px;
  background: var(--bg-1);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 18px;
}
.result-placeholder{ color: var(--text-low); font-size: 0.9rem; font-family: var(--font-body); }
.result-chip{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 34px;
  padding: 0 6px;
  border-radius: 6px;
  border: 1px solid var(--teal-dim);
  color: var(--teal);
  font-size: 1rem;
  font-weight: 600;
}
.result-final{
  width: 100%;
  text-align: center;
  color: var(--teal);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  word-break: break-all;
}

.solution-toggle{
  margin-top: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-mid);
  padding: 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  transition: border-color .15s ease, color .15s ease;
}
.solution-toggle:hover{ color: var(--text-hi); border-color: var(--teal-dim); }
.solution-toggle.open .chevron{ transform: rotate(180deg); }
.chevron{ transition: transform .2s ease; }

.solution-panel{
  max-width: 1000px;
  margin: 0 auto 60px;
}
.solution-section{ margin-bottom: 28px; }
.solution-section h2{
  font-size: 1.15rem;
  color: var(--amber);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-soft);
}

.steps{ display: flex; flex-direction: column; gap: 10px; }
.step-card{
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}
.step-title{
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-hi);
  margin-bottom: 4px;
}
.step-detail{
  color: var(--text-mid);
  font-size: 0.82rem;
  margin-bottom: 8px;
}
.step-bits{
  font-family: var(--font-mono);
  color: var(--teal);
  font-size: 0.88rem;
  word-break: break-all;
  background: var(--bg-1);
  border-radius: 6px;
  padding: 8px 10px;
  display: inline-block;
}
.step-matrix{ display: inline-grid; grid-template-columns: repeat(4, 40px); gap: 4px; }
.step-matrix.small{ grid-template-columns: repeat(2, 40px); }
.matrix-cell{
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--teal);
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: 5px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px){
  .module-grid{ grid-template-columns: repeat(2, 1fr); }
  .how-grid{ grid-template-columns: repeat(2, 1fr); }
  .workspace{ grid-template-columns: 1fr; }
}

@media (max-width: 640px){
  .site-header{ flex-direction: column; gap: 14px; }
  .site-nav{ flex-wrap: wrap; justify-content: center; }
  .module-grid{ grid-template-columns: 1fr; }
  .how-grid{ grid-template-columns: 1fr; }
  .hero-actions{ flex-direction: column; }
  .form-actions{ flex-direction: column; }
}