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

:root {
  --bg: #12131a;
  --bg-alt: #1a1c26;
  --card: #1f212c;
  --card-hover: #262938;
  --border: #2c2f3d;
  --text: #e8e9f0;
  --muted: #8a8fa3;
  --cyan: #00e5c7;
  --violet: #a78bfa;
  --valid: #34d399;
  --invalid: #fb7185;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  position: relative;
}

/* Signature: bilah spektrum warna tipis di paling atas halaman */
body::before {
  content: "";
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg,
    #ff5f6d, #ffc371, #f7ff7c, #7cffb2, #00e5c7, #7c9bff, #a78bfa, #ff7cf0, #ff5f6d);
  background-size: 200% 100%;
  animation: spektrum 12s linear infinite;
  z-index: 100;
}

@keyframes spektrum {
  to { background-position: 200% 0; }
}

h1, h2, h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  letter-spacing: -0.01em;
}

code {
  font-family: 'JetBrains Mono', monospace;
  background: rgba(0, 229, 199, 0.1);
  color: var(--cyan);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.9em;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.1rem 2rem;
  background: rgba(26, 28, 38, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 4px;
  z-index: 10;
}

.navbar-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.navbar-brand::before {
  content: "#";
  color: var(--cyan);
  margin-right: 2px;
}

.navbar-links a {
  margin-left: 1.8rem;
  text-decoration: none;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
  padding-bottom: 4px;
  transition: color 0.2s ease;
}

.navbar-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transition: width 0.25s ease;
}

.navbar-links a:hover { color: var(--text); }
.navbar-links a:hover::after { width: 100%; }

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.hero h1 {
  margin-bottom: 0.6rem;
  font-size: 2.1rem;
  background: linear-gradient(90deg, var(--text), var(--cyan) 120%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p { color: var(--muted); font-size: 1.02rem; max-width: 640px; }

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.8rem;
  margin-top: 1.5rem;
  transition: border-color 0.25s ease;
}

.panel:hover { border-color: #3a3e50; }

.panel h2 {
  font-size: 1.25rem;
  margin-top: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.panel h2::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  display: inline-block;
}

.input-group { margin-bottom: 1.1rem; }
.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

#input-hex {
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.05rem;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#input-hex:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 199, 0.15);
}

.hasil-validasi {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}

.status-box {
  padding: 0.65rem 1.1rem;
  border-radius: 8px;
  background: var(--bg-alt);
  color: var(--muted);
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid var(--border);
  transition: all 0.2s ease;
}

.status-box.valid {
  background: rgba(52, 211, 153, 0.1);
  color: var(--valid);
  border-color: rgba(52, 211, 153, 0.35);
}

.status-box.invalid {
  background: rgba(251, 113, 133, 0.1);
  color: var(--invalid);
  border-color: rgba(251, 113, 133, 0.35);
}

.preview-warna {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  border: 1px solid var(--border);
  transition: box-shadow 0.25s ease;
}

.diagram-wrapper { overflow-x: auto; }

.state {
  fill: var(--bg-alt);
  stroke: var(--border);
  stroke-width: 2;
  transition: fill 0.15s ease, stroke 0.15s ease, filter 0.15s ease;
}

.state.active {
  fill: var(--cyan);
  stroke: var(--violet);
  filter: drop-shadow(0 0 8px rgba(0, 229, 199, 0.7));
}

.state.trap { fill: rgba(251, 113, 133, 0.12); stroke: var(--invalid); }
.state-label { font-size: 14px; font-weight: 700; fill: var(--text); font-family: 'JetBrains Mono', monospace; }
.state.active + .state-label,
.state-label { pointer-events: none; }
.state-caption, .edge-label { font-size: 12px; fill: var(--muted); }

.table-wrapper { overflow-x: auto; border-radius: 10px; border: 1px solid var(--border); }

table { width: 100%; border-collapse: collapse; font-size: 0.94rem; }
th {
  text-align: left;
  padding: 0.7rem 0.9rem;
  background: var(--bg-alt);
  color: var(--muted);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
td {
  text-align: left;
  padding: 0.65rem 0.9rem;
  border-top: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
}
tbody tr { transition: background 0.15s ease; }
tbody tr:hover { background: var(--card-hover); }

.swatch {
  display: inline-block;
  width: 16px; height: 16px;
  border-radius: 4px;
  border: 1px solid var(--border);
  margin-right: 8px;
  vertical-align: middle;
}

.btn-primer {
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  color: #0f1016;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: 'Space Grotesk', sans-serif;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primer:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 229, 199, 0.25);
}

.btn-primer:active { transform: translateY(0); }

.btn-primer:disabled {
  opacity: 0.6;
  cursor: default;
  transform: none;
  box-shadow: none;
}

.stat-grid {
  display: flex;
  gap: 1rem;
  margin: 1.2rem 0;
}

.stat-card {
  flex: 1;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem;
  text-align: center;
}

.stat-card span {
  display: block;
  font-size: 1.9rem;
  font-weight: 700;
  font-family: 'Space Grotesk', sans-serif;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-card label { color: var(--muted); font-size: 0.85rem; }

.langkah { color: var(--text); padding-left: 1.2rem; }
.langkah li { margin-bottom: 0.5rem; }
.keterangan { color: var(--muted); font-size: 0.9rem; }

.footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

::selection { background: rgba(0, 229, 199, 0.3); color: var(--text); }

@media (prefers-reduced-motion: reduce) {
  body::before { animation: none; }
  .btn-primer, .panel, #input-hex { transition: none; }
}

.contoh-chips {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
}

.contoh-label {
  color: var(--muted);
  font-size: 0.85rem;
  margin-right: 0.3rem;
}

.contoh-chip {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.contoh-chip:hover { border-color: var(--cyan); color: var(--cyan); }

.trace-panel {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.trace-label {
  color: var(--muted);
  font-size: 0.82rem;
  margin-right: 0.5rem;
}

.trace-log {
  font-family: 'JetBrains Mono', monospace;
  color: var(--cyan);
  font-size: 0.92rem;
}

.state.accept { stroke: var(--valid); }
.accept-ring { stroke: var(--valid); stroke-width: 1.5; stroke-dasharray: 3 3; }

.btn-secondary {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.65rem 1.3rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

.status-state-panel {
  margin-top: 0.7rem;
  padding: 0.8rem 1rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.legenda {
  margin-top: 0.9rem;
  padding: 0.8rem 1rem;
  background: transparent;
}

.legenda-judul {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.6rem;
}

.legenda-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
}

.legenda-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.legenda-dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  display: inline-block;
}

.dot-active { background: var(--cyan); box-shadow: 0 0 6px rgba(0, 229, 199, 0.7); }
.dot-accept { background: transparent; border: 2px dashed var(--valid); }
.dot-trap { background: transparent; border: 2px solid var(--invalid); }