:root {
  --navy: #1a1f2e;
  --navy-light: #252d40;
  --green: #00b894;
  --green-dark: #00966d;
  --red: #e74c3c;
  --text: #2d3436;
  --text-light: #636e72;
  --bg: #f4f6f9;
  --white: #ffffff;
  --border: #dfe6e9;
  --card-shadow: 0 2px 12px rgba(0,0,0,0.08);
  --radius: 10px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

a { color: var(--green); text-decoration: none; }
a:hover { color: var(--green-dark); }

/* NAV */
nav {
  background: var(--navy);
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.5px;
}
.nav-brand span { color: var(--green); }
.nav-links { display: flex; gap: 8px; }
.nav-links a {
  color: rgba(255,255,255,0.75);
  font-size: 0.875rem;
  padding: 6px 12px;
  border-radius: 6px;
  transition: all 0.2s;
}
.nav-links a:hover { color: var(--white); background: rgba(255,255,255,0.08); }
.nav-links a.active { color: var(--green); }

/* HERO (homepage) */
.hero {
  background: var(--navy);
  color: var(--white);
  text-align: center;
  padding: 60px 24px 50px;
}
.hero h1 { font-size: 2.2rem; font-weight: 700; margin-bottom: 12px; }
.hero h1 span { color: var(--green); }
.hero p { font-size: 1.1rem; color: rgba(255,255,255,0.7); max-width: 560px; margin: 0 auto; }

/* CONTAINER */
.container { max-width: 1100px; margin: 0 auto; padding: 40px 24px; }
.container-narrow { max-width: 760px; margin: 0 auto; padding: 40px 24px; }

/* CALCULATOR GRID (homepage) */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 8px;
}
.calc-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}
.calc-card:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.12); }
.calc-card-icon { font-size: 2rem; margin-bottom: 12px; }
.calc-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.calc-card p { font-size: 0.875rem; color: var(--text-light); flex-grow: 1; margin-bottom: 16px; }
.btn-use {
  display: inline-block;
  background: var(--green);
  color: var(--white);
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  transition: background 0.2s;
  text-align: center;
}
.btn-use:hover { background: var(--green-dark); color: var(--white); }

/* SECTION TITLE */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text);
}
.section-title span { color: var(--green); }

/* BREADCRUMB */
.breadcrumb {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 20px;
}
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--green); }
.breadcrumb span { margin: 0 6px; }

/* PAGE HEADER */
.page-header {
  margin-bottom: 28px;
}
.page-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.page-header p {
  color: var(--text-light);
  font-size: 1rem;
  max-width: 640px;
}

/* CALCULATOR BOX */
.calc-box {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border);
  margin-bottom: 32px;
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.form-group .hint {
  font-size: 0.78rem;
  color: var(--text-light);
  font-weight: 400;
  margin-left: 4px;
}
.form-group input,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--white);
  transition: border-color 0.2s;
  outline: none;
}
.form-group input:focus,
.form-group select:focus {
  border-color: var(--green);
}

.calc-btn {
  width: 100%;
  padding: 13px;
  background: var(--green);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 4px;
}
.calc-btn:hover { background: var(--green-dark); }

/* RESULTS */
.results-panel {
  background: var(--navy);
  border-radius: var(--radius);
  padding: 28px;
  color: var(--white);
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.results-panel h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 20px;
}
.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.result-item:last-child { border-bottom: none; }
.result-label { font-size: 0.875rem; color: rgba(255,255,255,0.7); }
.result-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
}
.result-value.highlight { color: var(--green); font-size: 1.4rem; }
.result-value.negative { color: #ff7675; }
.result-placeholder {
  text-align: center;
  color: rgba(255,255,255,0.3);
  font-size: 0.9rem;
  margin: auto;
}

/* TABLE RESULTS */
.table-wrapper {
  overflow-x: auto;
  margin-top: 16px;
}
.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.results-table th {
  background: var(--navy);
  color: var(--white);
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
}
.results-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--border);
}
.results-table tr:nth-child(even) td { background: #f9fafb; }
.results-table .positive { color: var(--green); font-weight: 600; }
.results-table .negative { color: var(--red); font-weight: 600; }

/* INFO SECTIONS */
.info-section {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border);
  margin-bottom: 24px;
}
.info-section h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
}
.info-section p { color: var(--text-light); margin-bottom: 10px; }
.info-section p:last-child { margin-bottom: 0; }
.info-section ol, .info-section ul {
  padding-left: 20px;
  color: var(--text-light);
}
.info-section li { margin-bottom: 8px; }

/* FAQ */
.faq-item { margin-bottom: 16px; }
.faq-item h3 { font-size: 0.95rem; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.faq-item p { font-size: 0.875rem; color: var(--text-light); }

/* AD SLOTS */
.ad-slot {
  background: #f0f0f0;
  border: 1px dashed #ccc;
  border-radius: 6px;
  text-align: center;
  color: #999;
  font-size: 0.75rem;
  padding: 12px;
  margin: 20px 0;
}
.ad-slot-banner { height: 90px; line-height: 66px; }
.ad-slot-square { height: 250px; line-height: 226px; }

/* FOOTER */
footer {
  background: var(--navy);
  color: rgba(255,255,255,0.6);
  text-align: center;
  padding: 32px 24px;
  margin-top: 48px;
  font-size: 0.875rem;
}
footer .footer-links { margin-bottom: 12px; display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
footer .footer-links a { color: rgba(255,255,255,0.6); }
footer .footer-links a:hover { color: var(--green); }
footer .footer-brand { font-weight: 700; color: var(--white); font-size: 1rem; margin-bottom: 8px; }
footer .footer-brand span { color: var(--green); }

/* DISCLAIMER */
.disclaimer {
  background: #fff8e1;
  border-left: 4px solid #f39c12;
  padding: 12px 16px;
  border-radius: 0 6px 6px 0;
  font-size: 0.8rem;
  color: #7d6608;
  margin-bottom: 24px;
}

/* ABOUT / STATIC PAGES */
.static-content h2 { font-size: 1.2rem; font-weight: 700; margin: 24px 0 10px; color: var(--text); }
.static-content h2:first-child { margin-top: 0; }
.static-content p { color: var(--text-light); margin-bottom: 12px; }
.static-content ul { padding-left: 20px; color: var(--text-light); margin-bottom: 12px; }
.static-content li { margin-bottom: 6px; }

/* RESPONSIVE */
@media (max-width: 768px) {
  .calc-grid { grid-template-columns: repeat(2, 1fr); }
  .calc-layout { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.6rem; }
  .nav-links { display: none; }
  .calc-box { padding: 20px; }
  .results-panel { padding: 20px; }
}
@media (max-width: 480px) {
  .calc-grid { grid-template-columns: 1fr; }
}