:root {
  --bg: #07090f;
  --accent: #00e87a;
  --surface: #0d1117;
  --surface2: #131921;
  --text: #eef0f3;
  --muted: #7a8494;
  --border: rgba(255,255,255,.08);
  --border2: rgba(255,255,255,.14);
  --radius: 10px;
  --shadow: 0 2px 12px rgba(0,0,0,.45);
  --solar: #f4a261;
}

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

html {
  font-size: 16px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: .85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
}

.nav-brand {
  font-family: 'Syne', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.nav-brand span {
  color: var(--accent);
}
.nav-brand:hover {
  text-decoration: none;
}

main {
  flex: 1;
  padding: 2rem 1.5rem;
  max-width: 880px;
  margin: 0 auto;
  width: 100%;
}

h1 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: #fff;
}
h1 em {
  font-style: italic;
  color: #00e87a;
}

p {
  color: rgba(255,255,255,.78);
  font-size: 1.05rem;
  max-width: 560px;
  margin-bottom: 1.5rem;
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.editor-label {
  font-family: 'DM Mono', monospace;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  margin-bottom: .5rem;
  display: block;
}

textarea {
  width: 100%;
  padding: .85rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: 'DM Mono', monospace;
  font-size: .875rem;
  line-height: 1.6;
  background: var(--surface2);
  color: var(--text);
  resize: vertical;
  transition: border-color .2s;
}
textarea:focus {
  outline: none;
  border-color: var(--accent);
}
textarea {
  min-height: 200px;
}

.btn {
  padding: .55rem 1.1rem;
  border-radius: 7px;
  font-family: 'DM Sans', sans-serif;
  font-size: .88rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all .15s;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: #00cc6a;
}
.btn-primary:disabled {
  background: #555;
  cursor: not-allowed;
}

#results {
  margin-top: 1.5rem;
}
#results.hidden {
  display: none;
}
#results h2 {
  font-family: 'Syne', sans-serif;
  font-size: 1.3rem;
  margin-bottom: 1rem;
}
#results h3 {
  font-family: 'Syne', sans-serif;
  font-size: 1.1rem;
  margin: 1.5rem 0 .75rem;
  color: var(--accent);
}

.scores-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-box {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
}
.stat-val {
  font-family: 'Syne', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}
.stat-key {
  font-family: 'DM Mono', monospace;
  font-size: .7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-top: .2rem;
}
.stat-sub {
  font-size: .7rem;
  color: var(--muted);
  margin-top: .2rem;
}

footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  font-size: .82rem;
  color: var(--muted);
}
footer a {
  color: var(--accent);
}

@media (max-width: 640px) {
  nav {
    padding: .7rem 1rem;
  }
  main {
    padding: 1.25rem 1rem;
  }
  .tool-card {
    padding: 1.25rem 1rem;
  }
  textarea {
    font-size: 1rem !important;
  }
  .btn {
    min-height: 44px;
    padding: .65rem 1rem;
  }
  .scores-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: .75rem;
  }
  .stat-val {
    font-size: 1.2rem;
  }
  .stat-box {
    padding: .75rem .5rem;
  }
}