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

:root {
  --bg: #f7f9fc;
  --bg2: #ffffff;
  --bg3: #ffffff;
  --border: #e3e8f0;
  --text: #0f172a;
  --text2: #5b6878;
  --text3: #64748b;
  --accent: #2563eb;
  --green: #059669;
  --red: #dc2626;
  --yellow: #b45309;
  --orange: #ea580c;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(15,23,42,0.08);
}

body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; font-size: 15px; line-height: 1.5; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

nav { background: var(--bg2); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.nav-inner { max-width: 1100px; margin: 0 auto; padding: 0 20px; height: 56px; display: flex; align-items: center; gap: 24px; }
.logo { font-weight: 700; font-size: 18px; color: var(--accent); }

.nav-tabs { display: flex; gap: 4px; }
.tab-btn { background: none; border: none; color: var(--text2); padding: 6px 16px; border-radius: 8px; font-size: 14px; font-weight: 500; cursor: pointer; transition: all 0.15s; }
.tab-btn:hover { background: var(--bg3); color: var(--text); }
.tab-btn.active { background: var(--accent); color: #fff; }

.tab-content { display: none; }
.tab-content.active { display: block; }

.container { max-width: 1100px; margin: 0 auto; padding: 32px 20px; }

.card { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }

.main-grid { display: grid; grid-template-columns: 380px 1fr; gap: 20px; margin-bottom: 20px; }

/* INPUTS */
.inputs-card h2 { font-size: 18px; margin-bottom: 18px; }

.loan-type-row { display: flex; gap: 6px; margin-bottom: 20px; flex-wrap: wrap; }
.type-btn { background: var(--bg3); border: 1px solid var(--border); color: var(--text2); padding: 6px 14px; border-radius: 20px; font-size: 13px; cursor: pointer; transition: all 0.15s; }
.type-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.type-btn:hover:not(.active) { border-color: var(--accent); color: var(--text); }

.field-group { margin-bottom: 18px; }
.field-group label { display: block; font-size: 13px; color: var(--text2); margin-bottom: 7px; font-weight: 500; }
.optional { color: var(--text3); font-weight: 400; }

.input-wrap { display: flex; align-items: center; background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; margin-bottom: 8px; transition: border-color 0.15s; }
.input-wrap:focus-within { border-color: var(--accent); }
.input-wrap input { flex: 1; background: none; border: none; color: var(--text); padding: 10px 12px; font-size: 15px; font-weight: 600; outline: none; min-width: 0; }
.prefix, .suffix { padding: 0 12px; color: var(--text3); font-size: 14px; font-weight: 600; flex-shrink: 0; }

input[type=range] { width: 100%; accent-color: var(--accent); height: 4px; cursor: pointer; }
.slider-labels { display: flex; justify-content: space-between; font-size: 11px; color: var(--text3); margin-top: 4px; }

.term-row { display: flex; align-items: center; gap: 12px; }
.term-months { font-size: 13px; color: var(--text3); white-space: nowrap; }

.currency-row { display: flex; align-items: center; gap: 12px; }
.currency-row label { font-size: 13px; color: var(--text2); font-weight: 500; white-space: nowrap; }
.currency-row select, #currency { background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; color: var(--text); padding: 8px 12px; font-size: 14px; cursor: pointer; flex: 1; }

/* RESULTS */
.results-col { display: flex; flex-direction: column; gap: 16px; }

.summary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.summary-card { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; text-align: center; }
.summary-card.primary { background: var(--accent); border-color: var(--accent); }
.summary-card.primary .summary-label { color: rgba(15,23,42,0.7); }
.summary-card.primary .summary-value { color: #fff; }
.summary-label { font-size: 12px; color: var(--text3); margin-bottom: 6px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.5px; }
.summary-value { font-size: 22px; font-weight: 700; color: var(--text); }
.accent-red { color: var(--red) !important; }
.accent-green { color: var(--green) !important; }

.savings-banner { background: rgba(52,211,153,0.1); border: 1px solid rgba(52,211,153,0.3); border-radius: var(--radius); padding: 14px 18px; font-size: 14px; color: var(--text2); }
.savings-banner strong { color: var(--green); }

.chart-card h3 { font-size: 15px; margin-bottom: 16px; }
.donut-wrap { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.donut-svg { width: 160px; height: 160px; flex-shrink: 0; }
.donut-legend { display: flex; flex-direction: column; gap: 10px; }
.legend-item { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.legend-dot { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; }
.legend-label { color: var(--text2); font-size: 12px; }
.legend-value { font-weight: 600; }

/* AMORTIZATION */
.amort-card { margin-top: 0; }
.amort-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 16px; flex-wrap: wrap; }
.amort-header h3 { font-size: 16px; }
.amort-controls { display: flex; gap: 10px; }

.btn-secondary { background: var(--bg3); color: var(--text2); border: 1px solid var(--border); border-radius: 8px; padding: 8px 16px; font-size: 13px; font-weight: 500; cursor: pointer; transition: all 0.15s; }
.btn-secondary:hover { border-color: var(--accent); color: var(--text); }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
thead th { background: var(--bg3); color: var(--text2); padding: 10px 12px; text-align: right; font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.3px; border-bottom: 1px solid var(--border); }
thead th:first-child { text-align: left; }
tbody tr { border-bottom: 1px solid rgba(42,51,71,0.5); transition: background 0.1s; }
tbody tr:hover { background: var(--bg3); }
tbody tr.year-row { background: rgba(79,142,247,0.07); font-weight: 600; }
tbody tr.year-row td { color: var(--text); }
tbody td { padding: 9px 12px; text-align: right; color: var(--text2); }
tbody td:first-child { text-align: left; color: var(--text3); font-size: 13px; }
.td-principal { color: var(--accent) !important; }
.td-interest { color: var(--red) !important; }
.td-balance { color: var(--text) !important; }

/* COMPARE */
.compare-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 20px; }
.compare-loan-card { background: var(--bg2); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.compare-loan-card h3 { font-size: 14px; color: var(--text2); margin-bottom: 14px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.compare-loan-card .field-group { margin-bottom: 12px; }
.compare-loan-card label { font-size: 12px; }
.compare-loan-card .input-wrap input { font-size: 14px; padding: 8px 10px; }

.compare-results { }
.compare-table-wrap { overflow-x: auto; }
.compare-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.compare-table th { padding: 10px 14px; text-align: center; background: var(--bg3); color: var(--text2); font-size: 12px; text-transform: uppercase; letter-spacing: 0.3px; border-bottom: 1px solid var(--border); }
.compare-table th:first-child { text-align: left; }
.compare-table td { padding: 12px 14px; text-align: center; border-bottom: 1px solid rgba(42,51,71,0.5); }
.compare-table td:first-child { text-align: left; color: var(--text2); font-size: 13px; }
.best-val { color: var(--green); font-weight: 700; }
.worst-val { color: var(--red); }
.compare-results h3 { font-size: 15px; margin-bottom: 16px; }

@media (max-width: 800px) {
  .main-grid { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: 1fr; }
  .summary-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .summary-grid { grid-template-columns: 1fr; }
  .amort-controls { flex-wrap: wrap; }
}