@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display&family=DM+Sans:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #0a0a0f;
  --surface: #111118;
  --surface2: #1a1a24;
  --border: rgba(255,255,255,0.07);
  --border-hover: rgba(255,255,255,0.15);
  --accent: #c8ff00;
  --accent2: #00d4ff;
  --accent3: #ff6b35;
  --text: #f0f0f5;
  --text2: #888899;
  --text3: #555566;
  --green: #00e676;
  --red: #ff4444;
  --gold: #ffd740;
  --radius: 16px;
  --radius-sm: 8px;
  --font-display: 'DM Serif Display', serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  font-size: 15px;
}

/* NAV */
.nav {
  position: sticky; top: 0; z-index: 999;
  background: rgba(10,10,15,0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex; align-items: center;
  height: 64px; gap: 2rem;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 15px; font-weight: 500;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.5px;
  white-space: nowrap;
}
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex; gap: 4px; flex: 1;
  overflow-x: auto; scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-link {
  padding: 6px 14px;
  border-radius: 40px;
  font-size: 13px; font-weight: 400;
  color: var(--text2);
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.2s;
  border: 1px solid transparent;
}
.nav-link:hover { color: var(--text); background: var(--surface2); }
.nav-link.active { color: var(--bg); background: var(--accent); font-weight: 500; }

.nav-cta {
  padding: 8px 18px;
  background: var(--surface2);
  border: 1px solid var(--border-hover);
  border-radius: 40px;
  font-size: 13px; color: var(--text);
  text-decoration: none; white-space: nowrap;
  transition: all 0.2s;
}
.nav-cta:hover { border-color: var(--accent); color: var(--accent); }

/* TOOL PAGE SHELL */
.tool-shell {
  max-width: 1000px; margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

.tool-breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 12px; color: var(--text3);
  margin-bottom: 2rem;
  font-family: var(--font-mono);
}
.tool-breadcrumb a { color: var(--text3); text-decoration: none; }
.tool-breadcrumb a:hover { color: var(--accent); }
.tool-breadcrumb span { color: var(--text2); }

.tool-hero { margin-bottom: 2.5rem; }
.tool-hero .tool-tag {
  display: inline-block;
  font-size: 11px; font-family: var(--font-mono);
  color: var(--accent); letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 10px; border-radius: 20px;
  border: 1px solid rgba(200,255,0,0.25);
  background: rgba(200,255,0,0.07);
  margin-bottom: 1rem;
}
.tool-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.15; color: var(--text);
  margin-bottom: 0.75rem;
}
.tool-hero p { font-size: 16px; color: var(--text2); max-width: 600px; }

/* HOW TO USE */
.howto {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent2);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}
.howto h3 {
  font-size: 12px; font-family: var(--font-mono);
  color: var(--accent2); letter-spacing: 0.1em;
  text-transform: uppercase; margin-bottom: 0.5rem;
}
.howto p { font-size: 13px; color: var(--text2); line-height: 1.7; }
.howto ol, .howto ul { margin-left: 1.25rem; }
.howto li { font-size: 13px; color: var(--text2); margin-bottom: 4px; }

/* CALCULATOR LAYOUT */
.calc-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.5rem;
  align-items: start;
}
@media(max-width:760px){
  .calc-layout { grid-template-columns: 1fr; }
}

/* FORM PANEL */
.form-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}
.form-panel h2 {
  font-size: 13px; font-family: var(--font-mono);
  color: var(--text3); text-transform: uppercase;
  letter-spacing: 0.1em; margin-bottom: 1.5rem;
}

.field { margin-bottom: 1.25rem; }
.field label {
  display: block; font-size: 12px; font-weight: 500;
  color: var(--text2); margin-bottom: 6px;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.field input, .field select {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  font-size: 15px; font-family: var(--font-body);
  color: var(--text);
  transition: border-color 0.2s;
  appearance: none;
  -webkit-appearance: none;
}
.field input:focus, .field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(200,255,0,0.08);
}
.field input::placeholder { color: var(--text3); }

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.field-hint { font-size: 11px; color: var(--text3); margin-top: 4px; }

.calc-btn {
  width: 100%; padding: 14px;
  background: var(--accent);
  color: var(--bg); border: none;
  border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer; margin-top: 0.5rem;
  transition: all 0.2s; letter-spacing: 0.02em;
}
.calc-btn:hover { background: #d4ff26; transform: translateY(-1px); }
.calc-btn:active { transform: translateY(0); }

/* RESULTS PANEL */
.results-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  min-height: 400px;
}
.results-panel h2 {
  font-size: 13px; font-family: var(--font-mono);
  color: var(--text3); text-transform: uppercase;
  letter-spacing: 0.1em; margin-bottom: 1.5rem;
}

.empty-state {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  min-height: 300px; color: var(--text3); text-align: center;
}
.empty-state .es-icon { font-size: 40px; margin-bottom: 1rem; opacity: 0.4; }
.empty-state p { font-size: 14px; }

/* METRIC CARDS */
.metrics-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 1.5rem; }
.metric-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
}
.metric-card .mc-label { font-size: 11px; color: var(--text3); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 6px; }
.metric-card .mc-value { font-size: 22px; font-weight: 600; font-family: var(--font-mono); color: var(--text); }
.metric-card .mc-value.green { color: var(--green); }
.metric-card .mc-value.red { color: var(--red); }
.metric-card .mc-value.gold { color: var(--gold); }
.metric-card .mc-value.accent { color: var(--accent); }
.metric-card .mc-value.blue { color: var(--accent2); }
.metric-card .mc-sub { font-size: 11px; color: var(--text3); margin-top: 3px; }

/* CHART */
.chart-container {
  position: relative;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.25rem 1rem;
  margin-top: 0;
}
.chart-title {
  font-size: 11px; font-family: var(--font-mono);
  color: var(--text3); text-transform: uppercase;
  letter-spacing: 0.08em; margin-bottom: 1rem;
}
.chart-wrap { position: relative; height: 200px; }

/* LEGEND */
.chart-legend {
  display: flex; flex-wrap: wrap; gap: 12px;
  margin-bottom: 10px;
}
.legend-item { display: flex; align-items: center; gap: 5px; font-size: 12px; color: var(--text2); }
.legend-dot { width: 10px; height: 10px; border-radius: 2px; }

/* TABLE */
.data-table { width: 100%; border-collapse: collapse; margin-top: 1rem; font-size: 13px; }
.data-table th {
  text-align: left; padding: 8px 12px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text3); text-transform: uppercase;
  letter-spacing: 0.08em; border-bottom: 1px solid var(--border);
}
.data-table td {
  padding: 8px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  color: var(--text2); font-family: var(--font-mono); font-size: 12px;
}
.data-table tr:hover td { background: var(--surface2); color: var(--text); }
.data-table .pos { color: var(--green); }
.data-table .neg { color: var(--red); }

/* DISCLAIMER */
.disclaimer {
  font-size: 11px; color: var(--text3);
  padding: 1rem; border-top: 1px solid var(--border);
  margin-top: 2rem; text-align: center;
}

/* FOOTER */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  margin-top: 4rem;
}
.footer-inner {
  max-width: 1000px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 2rem;
}
@media(max-width:600px){ .footer-inner { grid-template-columns: 1fr; } }
.footer-brand .logo {
  font-family: var(--font-mono); font-size: 14px;
  color: var(--text); margin-bottom: 0.75rem;
}
.footer-brand .logo span { color: var(--accent); }
.footer-brand p { font-size: 12px; color: var(--text3); line-height: 1.7; }
.footer-col h4 {
  font-size: 11px; font-family: var(--font-mono);
  color: var(--text3); text-transform: uppercase;
  letter-spacing: 0.1em; margin-bottom: 0.75rem;
}
.footer-col a {
  display: block; font-size: 13px; color: var(--text2);
  text-decoration: none; margin-bottom: 6px;
  transition: color 0.15s;
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  max-width: 1000px; margin: 2rem auto 0;
  padding-top: 1.5rem; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px; color: var(--text3);
}

/* SCROLLBAR */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--surface2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* ANIMATIONS */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp 0.4s ease both; }
.fade-up-2 { animation: fadeUp 0.4s 0.1s ease both; }
.fade-up-3 { animation: fadeUp 0.4s 0.2s ease both; }