:root {
  --bg: #0a0f0a;
  --bg2: #111611;
  --bg3: #1a1f1a;
  --text: #e4e8e4;
  --text2: #a1aaa1;
  --text3: #717a71;
  --accent: #10b981;
  --accent2: #059669;
  --accent-glow: rgba(16,185,129,0.15);
  --green: #22c55e;
  --red: #ef4444;
  --yellow: #eab308;
  --border: #1f2a1f;
  --radius: 12px;
  --gold: #f59e0b;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent2); }

/* Header */
.header {
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  position: sticky; top: 0; z-index: 100;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 18px; color: var(--text);
}
.logo-icon { font-size: 24px; }
.nav { display: flex; gap: 24px; align-items: center; }
.nav a { color: var(--text2); font-size: 14px; font-weight: 500; }
.nav a:hover { color: var(--text); }

/* Hero */
.hero {
  text-align: center;
  padding: 80px 24px 60px;
}
.hero h1 {
  font-size: 48px; font-weight: 800;
  background: linear-gradient(135deg, #10b981, #f59e0b);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}
.hero-sub {
  font-size: 20px; color: var(--text2); margin-bottom: 24px;
}
.trust-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(16,185,129,0.1); color: var(--accent);
  padding: 8px 20px; border-radius: 999px; font-size: 14px; font-weight: 500;
  border: 1px solid rgba(16,185,129,0.2);
}
.badge-icon { font-size: 16px; }

/* Tools Grid */
.tools-section { padding: 60px 0; }
.tools-section h2 { font-size: 28px; margin-bottom: 32px; }
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.tool-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.2s;
  position: relative;
  display: block; color: var(--text);
}
.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(16,185,129,0.1);
  color: var(--text);
}
.tool-icon {
  font-size: 28px; font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
  font-family: 'SF Mono', 'Fira Code', monospace;
}
.tool-card h3 { font-size: 16px; margin-bottom: 8px; }
.tool-card p { font-size: 13px; color: var(--text2); line-height: 1.5; }
.tool-tag {
  position: absolute; top: 12px; right: 12px;
  background: var(--accent-glow); color: var(--accent);
  font-size: 11px; font-weight: 600; padding: 2px 8px;
  border-radius: 4px; text-transform: uppercase;
}
.tool-tag.gold {
  background: rgba(245,158,11,0.15); color: var(--gold);
}

/* About */
.about-section { padding: 60px 0; border-top: 1px solid var(--border); }
.about-section h2 { font-size: 28px; margin-bottom: 32px; text-align: center; }
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 24px;
}
.feature {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.feature h3 { font-size: 16px; margin-bottom: 8px; }
.feature p { font-size: 13px; color: var(--text2); }

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text3);
  font-size: 13px;
}

/* ===== Calculator Page Styles ===== */

.tool-page {
  padding: 32px 0 80px;
}
.tool-header {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 24px; flex-wrap: wrap;
}
.tool-header h1 { font-size: 28px; font-weight: 700; }
.tool-header .back-link {
  display: inline-flex; align-items: center; gap: 4px;
  color: var(--text3); font-size: 14px;
}
.tool-header .back-link:hover { color: var(--accent); }
.privacy-note {
  display: flex; align-items: center; gap: 6px;
  color: var(--accent); font-size: 13px;
  margin-left: auto;
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 768px) {
  .calc-layout { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
}

/* Calculator Input Panel */
.calc-input-panel {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.input-group {
  margin-bottom: 20px;
}
.input-group:last-child {
  margin-bottom: 0;
}
.input-group label {
  display: block; font-size: 13px; font-weight: 500;
  color: var(--text2); margin-bottom: 6px;
}
.input-row {
  display: flex; align-items: center; gap: 8px;
}
.input-prefix, .input-suffix {
  font-size: 14px; color: var(--text2); font-weight: 500;
  white-space: nowrap;
}
.input-field {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 16px;
  font-weight: 500;
  padding: 10px 14px;
  outline: none;
  transition: border-color 0.2s;
}
.input-field:focus {
  border-color: var(--accent);
}
.input-field::placeholder {
  color: var(--text3);
  font-weight: 400;
}

select.input-field {
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%23717a71'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.range-slider {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: var(--bg3);
  outline: none;
  margin-top: 8px;
}
.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg2);
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}
.range-slider::-moz-range-thumb {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg2);
}

.btn-calculate {
  width: 100%;
  padding: 14px;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 20px;
}
.btn-calculate:hover { background: var(--accent2); }

.btn-group {
  display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0;
}
.btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg2);
  color: var(--text);
  font-size: 13px; font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }

/* Calculator Results Panel */
.calc-results-panel {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.result-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
.result-item {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
}
.result-item.highlight {
  border-color: var(--accent);
  background: rgba(16,185,129,0.05);
}
.result-label {
  font-size: 12px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}
.result-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
}
.result-value.small {
  font-size: 18px;
}
.result-item.highlight .result-value {
  color: var(--accent);
}

/* Amortization Schedule */
.amort-toggle {
  display: flex; align-items: center; gap: 8px;
  color: var(--accent); font-size: 13px; font-weight: 500;
  cursor: pointer; background: none; border: none;
  padding: 8px 0; margin-bottom: 12px;
}
.amort-toggle:hover { color: var(--accent2); }
.amort-toggle .arrow {
  transition: transform 0.2s;
  display: inline-block;
}
.amort-toggle.open .arrow {
  transform: rotate(90deg);
}

.amort-table-wrap {
  display: none;
  max-height: 400px;
  overflow: auto;
}
.amort-table-wrap.show { display: block; }

.amort-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.amort-table th {
  position: sticky; top: 0;
  background: var(--bg3);
  color: var(--text2);
  font-weight: 600;
  text-align: right;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
}
.amort-table th:first-child { text-align: left; }
.amort-table td {
  padding: 6px 12px;
  text-align: right;
  border-bottom: 1px solid var(--border);
  color: var(--text2);
}
.amort-table td:first-child { text-align: left; color: var(--text3); }
.amort-table tr:hover td { background: var(--bg3); }

/* Chart area */
.chart-container {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-top: 16px;
}
.chart-container canvas {
  width: 100% !important;
  max-height: 200px;
}

/* About section on tool pages */
.tool-about {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.tool-about h2 {
  font-size: 22px; margin-bottom: 16px;
}
.tool-about h3 {
  font-size: 16px; margin: 20px 0 8px; color: var(--accent);
}
.tool-about p {
  font-size: 14px; color: var(--text2); line-height: 1.7;
  margin-bottom: 12px;
}
.tool-about ul {
  padding-left: 20px; color: var(--text2);
  font-size: 14px; line-height: 1.8;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text3);
}
.empty-state .empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.5;
}
.empty-state p {
  font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
  .hero { padding: 60px 16px 40px; }
  .hero h1 { font-size: 32px; }
  .hero-sub { font-size: 16px; }
  .tools-grid { grid-template-columns: 1fr; }
  .result-summary { grid-template-columns: 1fr; }
  .input-row { flex-wrap: wrap; }
}

/* Print styles for amortization schedules */
@media print {
  .header, .footer, .calc-input-panel, .btn-calculate { display: none; }
  body { background: #fff; color: #000; }
  .calc-results-panel { border: 1px solid #ccc; }
}