@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
  --bg:        #0d0f14;
  --bg2:       #13161e;
  --bg3:       #1a1d28;
  --border:    #252835;
  --border2:   #2e3245;
  --text:      #e8eaf0;
  --text2:     #8b91a8;
  --text3:     #555c75;
  --fg:        var(--text);
  --muted:     var(--text2);
  --mono:      'JetBrains Mono', monospace;
  --green:     #14f195;
  --green-dim: #0d9b61;
  --purple:    #9945ff;
  --blue:      #4e8cff;
  --red:       #f14d4d;
  --radius:    12px;
  --radius-sm: 8px;
  --shadow:    0 4px 24px rgba(0,0,0,.35);
}

body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* ── HEADER ── */
header {
  padding: 0 28px;
  border-bottom: 1px solid var(--border);
  background: rgba(13,15,20,.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 20px;
  height: 56px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
  flex-shrink: 0;
}

.logo-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--purple), var(--green));
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
}

.logo-sub {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text3);
  display: block;
  line-height: 1;
}

.nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.nav a {
  text-decoration: none;
  color: var(--text2);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  transition: color .15s, background .15s;
}

.nav a:hover { color: var(--text); background: var(--bg3); }
.nav a.active { color: var(--green); }

/* ── MAIN ── */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

/* ── HERO ── */
.hero {
  text-align: center;
  padding: 56px 0 48px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(153,69,255,.12);
  border: 1px solid rgba(153,69,255,.3);
  color: #c084fc;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 700;
  margin: 0 0 16px;
  line-height: 1.2;
  background: linear-gradient(135deg, #e8eaf0 30%, var(--green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 17px;
  color: var(--text2);
  max-width: 540px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── CARDS ── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  transition: border-color .2s;
}

.card:hover { border-color: var(--border2); }

.card h3 {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.card p {
  margin: 0 0 12px;
  color: var(--text2);
  font-size: 14px;
}

.card p:last-child { margin-bottom: 0; }

/* ── SIG CARD ── */
.sig-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 12px;
  transition: border-color .2s;
}

.sig-card:last-child { margin-bottom: 0; }
.sig-card:hover { border-color: var(--green-dim); }

.sig-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.sig-number {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text3);
}

.badge-match {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(20,241,149,.1);
  border: 1px solid rgba(20,241,149,.25);
  color: var(--green);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  padding: 3px 10px;
  border-radius: 20px;
}

.sig-hash {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text2);
  word-break: break-all;
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  margin-bottom: 10px;
}

.sig-meta {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 6px;
  margin-bottom: 12px;
}

.sig-meta-row {
  font-size: 12px;
  color: var(--text3);
}

.sig-meta-row span {
  color: var(--text2);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
}

.sig-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ── BUTTONS ── */
button, .btn {
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  transition: opacity .15s, transform .1s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
}

button:active, .btn:active { transform: scale(.97); }

.btn-primary {
  background: var(--green);
  color: #0d0f14;
}

.btn-primary:hover { opacity: .9; }

.btn-secondary {
  background: var(--bg3);
  border: 1px solid var(--border2);
  color: var(--text2);
}

.btn-secondary:hover { border-color: var(--text3); color: var(--text); }

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border2);
  color: var(--text2);
  font-size: 12px;
  padding: 5px 12px;
}

.btn-ghost:hover { border-color: var(--green-dim); color: var(--green); }

#btnReplay {
  background: var(--green);
  color: #0d0f14;
  font-size: 14px;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  border: none;
  margin-top: 4px;
  width: 100%;
}

#btnReplay:hover { opacity: .9; }
#btnReplay:disabled { opacity: .4; cursor: not-allowed; }

/* ── FORMS ── */
label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 5px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: .06em;
}

input, select, textarea {
  font: inherit;
  width: 100%;
  padding: 9px 12px;
  background: var(--bg3);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  color: var(--text);
  margin-bottom: 14px;
  outline: none;
  transition: border-color .15s;
  font-size: 13px;
}

input:focus, select:focus { border-color: var(--green-dim); }

input::placeholder { color: var(--text3); }

select option { background: var(--bg2); }

/* ── RESULT ── */
.result-banner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--radius);
  margin-bottom: 14px;
  border: 1px solid;
}

.result-banner.match {
  background: rgba(20,241,149,.07);
  border-color: rgba(20,241,149,.2);
}

.result-banner.mismatch {
  background: rgba(241,77,77,.07);
  border-color: rgba(241,77,77,.2);
}

.result-icon {
  font-size: 28px;
  line-height: 1;
  flex-shrink: 0;
}

.result-label {
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
}

.result-banner.match .result-label { color: var(--green); }
.result-banner.mismatch .result-label { color: var(--red); }

.result-sub {
  font-size: 12px;
  color: var(--text3);
  margin-top: 3px;
}

/* ── PRE-COMMITMENT TIMELINE ── */
.timeline-block {
  background: linear-gradient(180deg, rgba(153,69,255,.08), rgba(20,241,149,.035));
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-top: 16px;
  margin-bottom: 16px;
}

.timeline-block h4 {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text);
}

.timeline-track {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0;
  flex-wrap: wrap;
}

.timeline-point {
  flex: 0 0 auto;
  text-align: center;
  min-width: 138px;
}

.timeline-point .tl-label {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .05em;
}

.timeline-point .tl-slot {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg);
  margin-top: 4px;
}

.timeline-point.artifact .tl-slot { color: #9945ff; }
.timeline-point.resolution .tl-slot { color: var(--green); }

.timeline-gap {
  flex: 1;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  min-width: 180px;
}

.timeline-caption {
  font-size: 12px;
  color: var(--muted);
  margin-top: 8px;
  line-height: 1.5;
}

.tl-compact {
  display: block;
  font-size: 11px;
  color: var(--muted);
  font-family: var(--mono);
  margin-top: 6px;
}

/* ── LOADING ── */
.loading {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text3);
  font-size: 13px;
  padding: 12px 0;
}

@keyframes spin { to { transform: rotate(360deg); } }

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border2);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  flex-shrink: 0;
}

/* ── PRE / CODE ── */
pre {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text2);
  margin: 0;
  max-height: 360px;
}

/* ── DIVIDER ── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 20px 0;
}

/* ── GRID ── */
.grid2 {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 640px) {
  .grid2 { grid-template-columns: 1fr; }
  .sig-card-header { flex-direction: column; align-items: flex-start; }
  header { padding: 0 16px; }
  main { padding: 20px 16px 48px; }
  .logo { min-width: 0; flex-shrink: 1; }
  .logo > div { min-width: 0; overflow: hidden; }
  .nav a { padding: 6px 10px; }
}

@media (max-width: 420px) {
  .logo-sub { display: none; }
  .nav a { padding: 5px 7px; font-size: 12px; }
}

/* ── FEATURE GRID ── */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 32px;
}

.feature {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}

.feature-icon { font-size: 22px; margin-bottom: 10px; }
.feature h4 { margin: 0 0 6px; font-size: 14px; font-weight: 600; }
.feature p  { margin: 0; font-size: 13px; color: var(--text2); }

/* ── EXTERNAL LINK ICON ── */
.ext::after {
  content: ' ↗';
  font-size: 10px;
  opacity: .6;
}