:root {
  --bg-primary: #070e17;
  --bg-card: #0d1a29;
  --bg-input: #15273c;
  --border-color: rgba(99, 102, 241, 0.18);
  --border-focus: #6366f1;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-indigo: #6366f1;
  --accent-blue: #3b82f6;
  --accent-emerald: #10b981;
  --accent-gold: #f59e0b;
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.15);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.navbar {
  background: rgba(13, 26, 41, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 12px 24px;
}
.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 800;
  font-size: 18px;
}
.logo-icon {
  font-size: 22px;
  background: rgba(99, 102, 241, 0.15);
  padding: 6px;
  border-radius: 8px;
}
.nav-links-suite {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.nav-tool-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid transparent;
  transition: all 0.2s;
}
.nav-tool-link:hover, .nav-tool-link.active {
  color: var(--accent-indigo);
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--border-color);
}

.main-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px 24px 64px;
  flex: 1;
  width: 100%;
}
.hero-section { text-align: center; margin-bottom: 36px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-indigo);
  border: 1px solid var(--border-color);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.hero-title {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}
.hero-title span {
  background: linear-gradient(135deg, #6366f1, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle { color: var(--text-muted); font-size: 15px; max-width: 780px; margin: 0 auto; }

.calc-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 28px;
  align-items: start;
}
@media (max-width: 960px) { .calc-grid { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
}
.card-title {
  font-size: 17px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-group { margin-bottom: 16px; }
.form-label {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}
.form-hint { font-size: 11px; color: var(--text-muted); font-weight: 400; }
.input-wrapper { position: relative; display: flex; align-items: center; }
.input-prefix, .input-suffix {
  position: absolute;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  pointer-events: none;
}
.input-prefix { left: 14px; }
.input-suffix { right: 14px; }
input[type="number"], select {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 14px;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  outline: none;
  transition: border-color 0.2s;
}
input[type="number"].has-prefix { padding-left: 32px; }
input[type="number"].has-suffix { padding-right: 48px; }
input[type="number"]:focus, select:focus { border-color: var(--border-focus); }

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}
.metric-box {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}
.metric-box.primary {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(59, 130, 246, 0.05));
  border-color: var(--accent-indigo);
}
.metric-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}
.metric-val { font-size: 24px; font-weight: 800; color: #fff; }
.metric-val.indigo { color: var(--accent-indigo); }
.metric-val.blue { color: var(--accent-blue); }
.metric-val.emerald { color: var(--accent-emerald); }
.metric-val.gold { color: var(--accent-gold); }

.detail-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  font-size: 13px;
}
.detail-table tr { border-bottom: 1px solid rgba(255,255,255,0.05); }
.detail-table td { padding: 10px 0; color: var(--text-muted); }
.detail-table td:last-child { text-align: right; font-weight: 700; color: var(--text-main); }

.footer {
  border-top: 1px solid var(--border-color);
  background: rgba(13, 26, 41, 0.6);
  padding: 24px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
}