/* ===== FINCALC SHARED STYLES ===== */

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

:root {
  --blue: #1a56db;
  --blue-dark: #1341a8;
  --blue-light: #e8f0fe;
  --text: #1f2937;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --bg: #ffffff;
  --bg-alt: #f9fafb;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --radius: 8px;
  --max-width: 1200px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== NAVIGATION ===== */
.site-nav {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blue);
  text-decoration: none;
  white-space: nowrap;
}

.nav-logo:hover { text-decoration: none; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.nav-links a {
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--blue-light);
  color: var(--blue);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--text);
}

/* ===== AD PLACEHOLDERS ===== */
.ad-leaderboard {
  display: none;
}

.ad-rectangle {
  display: none;
}

/* ===== PAGE LAYOUT ===== */
.page-header {
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-dark) 100%);
  color: white;
  padding: 2.5rem 1.5rem 2rem;
  text-align: center;
}

.page-header h1 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.page-header p {
  opacity: 0.88;
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  padding: 2rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.calc-main { min-width: 0; }

.calc-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ===== CARDS ===== */
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--text);
  border-bottom: 2px solid var(--blue-light);
  padding-bottom: 0.6rem;
}

/* ===== FORMS ===== */
.form-group {
  margin-bottom: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.35rem;
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix,
.input-suffix {
  position: absolute;
  color: var(--text-muted);
  font-size: 0.9rem;
  pointer-events: none;
}

.input-prefix { left: 0.75rem; }
.input-suffix { right: 0.75rem; }

input[type="number"],
input[type="text"],
select {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.15s, box-shadow 0.15s;
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }

input.has-prefix { padding-left: 1.75rem; }
input.has-suffix { padding-right: 2rem; }

input:focus, select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.5rem;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background 0.15s, transform 0.1s;
}

.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--blue);
  color: white;
  width: 100%;
  margin-top: 0.5rem;
  padding: 0.8rem;
  font-size: 1rem;
}

.btn-primary:hover { background: var(--blue-dark); }

.btn-secondary {
  background: var(--bg-alt);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover { background: var(--border); }

/* ===== RESULTS ===== */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.result-item {
  background: var(--blue-light);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
}

.result-item .label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.3rem;
}

.result-item .value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--blue-dark);
}

.result-item .value.large {
  font-size: 1.7rem;
}

/* ===== TABLES ===== */
.table-wrap {
  overflow-x: auto;
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

thead th {
  background: var(--blue);
  color: white;
  padding: 0.65rem 1rem;
  text-align: right;
  font-weight: 600;
  white-space: nowrap;
}

thead th:first-child { text-align: left; }

tbody tr:nth-child(even) { background: var(--bg-alt); }

tbody td {
  padding: 0.55rem 1rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody td:first-child { text-align: left; }

.table-footer-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* ===== TOGGLE BUTTONS ===== */
.toggle-group {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.toggle-group button {
  flex: 1;
  padding: 0.55rem 0.75rem;
  border: none;
  background: var(--bg);
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.toggle-group button:not(:last-child) {
  border-right: 1px solid var(--border);
}

.toggle-group button.active {
  background: var(--blue);
  color: white;
}

/* ===== CHART CANVAS ===== */
.chart-container {
  position: relative;
  width: 100%;
  margin-top: 1rem;
}

canvas {
  max-width: 100%;
}

/* ===== SEO CONTENT ===== */
.seo-content {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
}

.seo-content .container p {
  max-width: 800px;
  color: var(--text-muted);
  line-height: 1.75;
  font-size: 0.95rem;
}

/* ===== HOMEPAGE CARDS ===== */
.hero {
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-dark) 100%);
  color: white;
  text-align: center;
  padding: 4rem 1.5rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.15rem;
  opacity: 0.9;
  max-width: 520px;
  margin: 0 auto;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  padding: 3rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.calc-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  background: var(--bg);
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
}

.calc-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
}

.calc-card-icon {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.calc-card h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.calc-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  flex: 1;
  margin-bottom: 1.25rem;
}

.calc-card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--blue);
  font-weight: 600;
  font-size: 0.9rem;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--text);
  color: #d1d5db;
  text-align: center;
  padding: 1.5rem;
  font-size: 0.875rem;
}

.site-footer a { color: #93c5fd; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; width: 100%; }
  .nav-links.open { display: flex; }
  .nav-inner { flex-wrap: wrap; height: auto; padding: 0.75rem 1.25rem; gap: 0.5rem; }
  .nav-toggle { display: block; }
  .nav-links a { padding: 0.6rem 0.75rem; width: 100%; }

  .calc-layout {
    grid-template-columns: 1fr;
    padding: 1.25rem;
  }

  .calc-sidebar { order: -1; }
  .ad-rectangle { width: 100%; max-width: 320px; margin: 0 auto; }

  .form-row { grid-template-columns: 1fr; }

  .results-grid { grid-template-columns: 1fr 1fr; }
}

/* ===== TOOLTIPS ===== */
.tooltip-term {
  border-bottom: 1px dotted var(--text-muted);
  cursor: help;
  position: relative;
  display: inline;
}
.tooltip-popup {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 0.85rem;
  font-size: 0.82rem;
  color: var(--text);
  width: 260px;
  max-width: calc(100vw - 2rem);
  box-shadow: var(--shadow-md);
  z-index: 200;
  display: none;
  line-height: 1.5;
  font-weight: 400;
}
.tooltip-popup.visible { display: block; }
.tooltip-popup a { color: var(--blue); font-weight: 600; white-space: nowrap; }
@media (max-width: 600px) { .tooltip-popup { width: 220px; } }

@media (max-width: 480px) {
  .hero { padding: 2.5rem 1rem; }
  .calc-grid { padding: 1.5rem 1rem; gap: 1rem; }
  .results-grid { grid-template-columns: 1fr; }
}