:root {
  --bg-dark: #07090e;
  --bg-card: #0e121b;
  --border-color: #1a2233;
  --accent-gold: #fbbf24;
  --accent-cyan: #06b6d4;
  --accent-purple: #a855f7;
  --accent-green: #10b981;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --font-sans: 'Plus Jakarta Sans', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.5;
  min-height: 100vh;
}

.top-nav {
  background: rgba(14, 18, 27, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main);
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.badge-offline {
  background: rgba(251, 191, 36, 0.15);
  color: #fde047;
  border: 1px solid rgba(251, 191, 36, 0.35);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 9999px;
  letter-spacing: 0.05em;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lang-switcher {
  display: flex;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.lang-btn.active {
  background: rgba(251, 191, 36, 0.25);
  color: #fde047;
}

.nav-link-home {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-link-home:hover {
  color: var(--accent-gold);
}

/* Main */
.main-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.hero-section {
  text-align: center;
  margin-bottom: 2.5rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(251, 191, 36, 0.1);
  color: var(--accent-gold);
  border: 1px solid rgba(251, 191, 36, 0.25);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 0.85rem;
  line-height: 1.25;
}

.hero-desc {
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto;
  font-size: 0.95rem;
  line-height: 1.6;
}

.hero-desc code {
  background: rgba(255, 255, 255, 0.08);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: var(--accent-gold);
}

/* Calc Card */
.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.75rem;
  margin-bottom: 2rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.chain-mode-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.mode-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.toggle-pills {
  display: flex;
  background: #07090e;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0.25rem;
  gap: 0.25rem;
}

.toggle-pill {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

.toggle-pill.active {
  background: rgba(251, 191, 36, 0.15);
  color: var(--accent-gold);
  border: 1px solid rgba(251, 191, 36, 0.3);
}

.input-config-row {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 640px) {
  .input-config-row {
    grid-template-columns: 1fr;
  }
}

.input-box label, .threads-box label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.input-box input[type="text"] {
  width: 100%;
  background: #07090e;
  border: 1px solid var(--border-color);
  color: var(--accent-gold);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.8rem 1rem;
  border-radius: 10px;
  outline: none;
}

.input-box input[type="text"]:focus {
  border-color: var(--accent-gold);
}

.char-hint {
  display: block;
  font-size: 0.75rem;
  color: #64748b;
  margin-top: 0.35rem;
}

.threads-box input[type="range"] {
  width: 100%;
  margin-top: 0.6rem;
  accent-color: var(--accent-gold);
}

.action-row {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
}

.btn-primary-gen {
  width: 100%;
  max-width: 420px;
  background: linear-gradient(135deg, var(--accent-gold) 0%, #ea580c 100%);
  color: #0b0e14;
  font-size: 1.05rem;
  font-weight: 800;
  padding: 0.95rem 1.5rem;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(251, 191, 36, 0.35);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s;
}

.btn-primary-gen:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

.btn-primary-gen.mining {
  background: linear-gradient(135deg, #ef4444 0%, #b91c1c 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(239, 68, 68, 0.4);
}

/* Dashboard */
.metrics-dashboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.m-card {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.m-lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.m-stat {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
}

.text-cyan { color: var(--accent-cyan); }
.text-purple { color: var(--accent-purple); }

/* Result Section */
.result-section {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.35);
  border-radius: 16px;
  padding: 1.75rem;
  margin-bottom: 2rem;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-header {
  margin-bottom: 1.25rem;
}

.win-badge {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
  font-size: 0.85rem;
  font-weight: 800;
  padding: 0.35rem 0.85rem;
  border-radius: 8px;
}

.field-row {
  margin-bottom: 1.25rem;
}

.field-row label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.code-copy-group {
  display: flex;
  gap: 0.5rem;
}

.code-input {
  flex: 1;
  background: #07090e;
  border: 1px solid var(--border-color);
  color: #34d399;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  outline: none;
}

.btn-copy, .btn-toggle-vis {
  background: #1e293b;
  border: 1px solid var(--border-color);
  color: #f1f5f9;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0 1rem;
  border-radius: 8px;
  cursor: pointer;
}

.result-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.btn-download {
  background: #10b981;
  color: #04121e;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 0.7rem 1.2rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
}

.btn-cross {
  text-decoration: none;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: #f1f5f9;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.7rem 1.2rem;
  border-radius: 8px;
}

/* FAQ */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.faq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
}

.faq-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.faq-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}