@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@600;700;800;900&family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --blue:        #2563EB;
  --blue-dark:   #1D4ED8;
  --blue-deeper: #1E40AF;
  --blue-pale:   #DBEAFE;
  --blue-faint:  #EFF6FF;
  --dark:        #0F172A;
  --text:        #0F172A;
  --muted:       #64748B;
  --border:      #E2E8F0;
  --white:       #FFFFFF;
  --green:       #16A34A;
  --red:         #DC2626;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: #F8FAFC;
}

h1, h2, h3, h4 { font-family: 'Playfair Display', Georgia, serif; color: var(--dark); line-height: 1.25; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-dark); }

/* HEADER */
.header {
  position: sticky; top: 0; z-index: 100;
  background: var(--dark);
  border-bottom: 3px solid var(--blue);
  padding: 14px 24px;
}
.header__inner { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.logo { font-family: 'Playfair Display', serif; font-size: 22px; font-weight: 800; color: var(--white); text-decoration: none; display: flex; align-items: center; gap: 8px; }
.logo span { color: var(--blue); }
.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a { color: #CBD5E1; font-weight: 500; font-size: 14px; }
.nav-links a:hover { color: var(--blue); }
@media (max-width: 720px) { .nav-links { display: none; } }

/* HERO */
.hero {
  background: linear-gradient(135deg, var(--dark) 0%, #0F2A5A 50%, #1E3A8A 100%);
  color: var(--white);
  padding: 80px 24px 64px;
  text-align: center;
}
.hero__inner { max-width: 900px; margin: 0 auto; }
.hero__badge {
  display: inline-block;
  background: rgba(37,99,235,0.18);
  border: 1px solid rgba(37,99,235,0.5);
  color: var(--blue-pale);
  padding: 6px 16px; border-radius: 999px;
  font-size: 13px; font-weight: 600; letter-spacing: 0.5px;
  margin-bottom: 22px;
}
.hero h1 { font-size: clamp(34px, 5vw, 56px); font-weight: 800; color: var(--white); margin-bottom: 18px; }
.hero h1 em { color: var(--blue-pale); font-style: italic; }
.hero p { font-size: 18px; color: #CBD5E1; max-width: 680px; margin: 0 auto 32px; }
.search-bar {
  display: flex; gap: 0;
  max-width: 560px; margin: 0 auto;
  background: var(--white); border-radius: 999px;
  overflow: hidden; box-shadow: 0 8px 32px rgba(0,0,0,0.25);
}
.search-bar input {
  flex: 1; padding: 16px 22px; border: none; outline: none;
  font-family: inherit; font-size: 16px; color: var(--text);
}
.search-bar button {
  background: var(--blue); color: var(--white); border: none;
  padding: 0 28px; font-family: inherit; font-weight: 700; cursor: pointer;
}

/* MAIN CONTENT */
.main { max-width: 1200px; margin: 0 auto; padding: 56px 24px; }
.section-heading {
  font-size: 28px; font-weight: 700;
  margin-bottom: 28px;
  display: flex; align-items: center; gap: 12px;
  border-bottom: 2px solid var(--border);
  padding-bottom: 12px;
}
.section-heading .emoji { font-size: 32px; }

/* TOOL CARD GRID */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 56px;
}
.tool-card {
  display: block;
  background: var(--white);
  border: 1px solid var(--border);
  border-left: 4px solid transparent;
  border-radius: 10px;
  padding: 20px;
  transition: all 0.18s ease;
  text-decoration: none;
  color: inherit;
}
.tool-card:hover {
  border-left-color: var(--blue);
  box-shadow: 0 8px 24px rgba(15,23,42,0.08);
  transform: translateY(-2px);
}
.tool-card h3 { font-family: 'Inter', sans-serif; font-size: 16px; font-weight: 700; color: var(--dark); margin-bottom: 6px; }
.tool-card p { font-size: 13px; color: var(--muted); }

/* BREADCRUMB */
.breadcrumb {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  font-size: 13px;
  color: var(--muted);
}
.breadcrumb__inner { max-width: 1200px; margin: 0 auto; }
.breadcrumb a { color: var(--blue); }
.breadcrumb .sep { margin: 0 8px; color: var(--border); }

/* CALC LAYOUT */
.calc-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  max-width: 1200px;
  margin: 32px auto;
  padding: 0 24px;
}
@media (max-width: 960px) { .calc-layout { grid-template-columns: 1fr; } }

.calc-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px;
  margin-bottom: 24px;
}
.calc-card h1 { font-size: 32px; margin-bottom: 8px; }
.calc-card .lede { color: var(--muted); margin-bottom: 28px; font-size: 15px; }

.field { margin-bottom: 18px; }
.field label {
  display: block; font-size: 13px; font-weight: 600;
  color: var(--dark); margin-bottom: 6px;
}
.field input, .field select {
  width: 100%; padding: 12px 14px;
  border: 1px solid var(--border); border-radius: 8px;
  font-family: inherit; font-size: 15px; color: var(--text);
  outline: none; transition: border-color 0.15s;
  background: var(--white);
}
.field input:focus, .field select:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(37,99,235,0.12); }

.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 540px) { .field-grid { grid-template-columns: 1fr; } }

.btn {
  display: inline-block;
  background: var(--blue); color: var(--white);
  padding: 14px 32px;
  border: none; border-radius: 8px;
  font-family: 'Inter', sans-serif;
  font-size: 14px; font-weight: 800; letter-spacing: 0.6px; text-transform: uppercase;
  cursor: pointer; transition: background 0.15s;
}
.btn:hover { background: var(--blue-dark); }
.btn--secondary { background: transparent; color: var(--blue); border: 2px solid var(--blue); }
.btn--secondary:hover { background: var(--blue); color: var(--white); }

/* RESULT BOX */
.result-box {
  background: var(--blue-faint);
  border: 1px solid var(--blue-pale);
  border-radius: 12px;
  padding: 28px;
  margin-top: 24px;
  display: none;
}
.result-box.show { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.result-box h3 { font-size: 14px; font-family: 'Inter', sans-serif; text-transform: uppercase; letter-spacing: 1px; color: var(--blue-deeper); margin-bottom: 6px; font-weight: 700; }
.result-primary {
  font-family: 'Playfair Display', serif;
  font-size: 48px; font-weight: 800;
  color: var(--blue-deeper);
  line-height: 1.1;
  margin-bottom: 16px;
}
.result-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px; margin-top: 16px;
  border-top: 1px solid var(--blue-pale);
  padding-top: 16px;
}
.result-item { font-size: 13px; }
.result-item .label { color: var(--blue-deeper); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; font-size: 11px; margin-bottom: 4px; }
.result-item .val { font-size: 18px; font-weight: 700; color: var(--dark); font-family: 'Inter', sans-serif; }
.result-item .val.green { color: var(--green); }
.result-item .val.red { color: var(--red); }

.error-msg { color: var(--red); font-size: 14px; margin-top: 8px; }
.error-msg.show { display: block; }

/* INFO BOX */
.info-box {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-top: 24px;
}
.info-box h3 { font-family: 'Inter', sans-serif; font-size: 16px; margin-bottom: 12px; color: var(--dark); }
.info-box p { color: var(--muted); font-size: 14px; margin-bottom: 10px; }
.info-box ul { margin-left: 18px; color: var(--muted); font-size: 14px; }
.info-box li { margin-bottom: 4px; }

/* SIDEBAR */
.sidebar { position: sticky; top: 100px; align-self: start; }
.sidebar-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}
.sidebar-card h4 { font-family: 'Inter', sans-serif; font-size: 13px; text-transform: uppercase; letter-spacing: 1px; color: var(--blue-deeper); margin-bottom: 12px; }
.sidebar-card ul { list-style: none; }
.sidebar-card li { margin-bottom: 8px; }
.sidebar-card a { font-size: 14px; color: var(--text); }
.sidebar-card a:hover { color: var(--blue); }

/* AMORTIZATION TABLE */
.amort-table {
  width: 100%; border-collapse: collapse; margin-top: 18px;
  font-size: 13px;
}
.amort-table th, .amort-table td { padding: 10px 12px; text-align: right; border-bottom: 1px solid var(--border); }
.amort-table th { background: var(--blue-faint); color: var(--blue-deeper); font-weight: 700; text-align: right; font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.amort-table th:first-child, .amort-table td:first-child { text-align: left; }
.amort-table tbody tr:hover { background: var(--blue-faint); }

/* COMPARE GRID */
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 18px; }
@media (max-width: 540px) { .compare-grid { grid-template-columns: 1fr; } }
.compare-card {
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}
.compare-card.winner { border-color: var(--green); background: #F0FDF4; }
.compare-card h4 { font-family: 'Inter', sans-serif; font-size: 14px; color: var(--muted); margin-bottom: 8px; }
.compare-card .big { font-family: 'Playfair Display', serif; font-size: 30px; font-weight: 800; color: var(--dark); }
.compare-card .sub { font-size: 13px; color: var(--muted); margin-top: 4px; }

/* DISCLAIMER */
.disclaimer {
  background: #FEF9C3;
  border: 1px solid #FDE68A;
  border-radius: 8px;
  padding: 14px 18px;
  margin-top: 24px;
  font-size: 13px;
  color: #713F12;
}

/* FOOTER */
.footer {
  background: var(--dark);
  color: #94A3B8;
  padding: 56px 24px 32px;
  margin-top: 80px;
}
.footer__inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px;
}
@media (max-width: 720px) { .footer__inner { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer__inner { grid-template-columns: 1fr; } }
.footer h4 { color: var(--blue-pale); font-family: 'Inter', sans-serif; font-size: 13px; text-transform: uppercase; letter-spacing: 1.2px; margin-bottom: 14px; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 8px; }
.footer a { color: #94A3B8; font-size: 14px; }
.footer a:hover { color: var(--blue-pale); }
.footer__bottom {
  max-width: 1200px; margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid #1E293B;
  text-align: center;
  font-size: 13px;
  color: #64748B;
}

/* HIDDEN UTILITY */
.hidden { display: none !important; }