:root {
  --ink: #1b2a36;
  --navy: #1e3a4c;
  --navy-dark: #152a38;
  --accent: #1f6b57;
  --accent-hover: #185445;
  --paper: #f6f4ef;
  --card: #ffffff;
  --muted: #5d6b74;
  --line: #d8d2c6;
  --result: #eef5f2;
  --shadow: 0 8px 24px rgba(27, 42, 54, 0.08);
}

html {
  height: 100%;
}

body {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  color: var(--ink);
  background: var(--paper);
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  line-height: 1.55;
}

#main {
  flex: 1 0 auto;
}

h1, h2, h3, .navbar-brand, .footer-brand {
  font-family: "Source Serif 4", Georgia, serif;
}

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -3rem;
  z-index: 2000;
  background: #fff;
  color: var(--navy);
  padding: 0.5rem 0.75rem;
  border-radius: 0.25rem;
}

.skip-link:focus {
  top: 0.75rem;
}

.site-nav {
  background: var(--navy);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.08);
}

.site-nav .navbar-brand {
  font-weight: 600;
  letter-spacing: 0.01em;
}

.site-nav .nav-link {
  font-weight: 500;
}

.site-nav .dropdown-menu {
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.site-footer {
  background: var(--navy-dark);
  color: #d7e0e6;
  padding: 2.5rem 0 1.5rem;
  margin-top: auto;
}

.footer-brand {
  font-size: 1.25rem;
  color: #fff;
  margin-bottom: 0.5rem;
}

.footer-blurb,
.footer-copy {
  color: #b7c4cc;
  font-size: 0.95rem;
}

.footer-heading {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #fff;
  margin-bottom: 0.75rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links a {
  color: #d7e0e6;
  text-decoration: none;
  display: inline-block;
  padding: 0.2rem 0;
}

.footer-links a:hover {
  color: #fff;
  text-decoration: underline;
}

.footer-copy {
  margin: 2rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

/* Homepage */
.hero {
  background: linear-gradient(180deg, var(--navy) 0%, #24485c 100%);
  color: #f4f7f8;
  padding: 3rem 0 3.25rem;
}

.hero-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 600;
  color: #c5d6c9;
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.75rem);
  font-weight: 600;
  margin-bottom: 1rem;
  max-width: 18ch;
}

.hero-lead {
  font-size: 1.15rem;
  max-width: 38rem;
  color: #d7e3e8;
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn-accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 0.6rem 1.15rem;
}

.btn-accent:hover,
.btn-accent:focus {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: #fff;
  font-weight: 600;
  padding: 0.6rem 1.15rem;
}

.btn-ghost:hover,
.btn-ghost:focus {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: #fff;
}

.home-section {
  padding: 2.5rem 0;
}

.section-kicker {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.35rem;
}

.section-title {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
}

.calc-card {
  height: 100%;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  padding: 1.25rem 1.2rem 1.15rem;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.calc-card:hover,
.calc-card:focus {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(27, 42, 54, 0.12);
  color: inherit;
}

.calc-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
}

.calc-card p {
  color: var(--muted);
  margin-bottom: 0.85rem;
  flex: 1 1 auto;
}

.calc-card .card-cta {
  font-weight: 600;
  color: var(--accent);
}

.home-note {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Calculator pages */
.calc-page {
  padding: 1.75rem 0 2.5rem;
}

.calc-header h1 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin-bottom: 0.5rem;
}

.calc-header p,
.introStrat {
  color: var(--muted);
  max-width: 48rem;
}

.introStrat {
  margin: 0 0 1.25rem;
  width: auto;
}

.introStrat fieldset {
  border: 0;
  padding: 0;
  margin: 0;
}

.introStrat legend {
  float: none;
  width: auto;
  padding: 0;
  margin-bottom: 0.5rem;
}

.introStrat legend h1 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  color: var(--ink);
  margin: 0;
}

.calc-panel,
.results-panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.results-panel {
  background: var(--result);
}

.results-panel h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.result-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(31, 107, 87, 0.12);
}

.result-row:last-child {
  border-bottom: 0;
}

.result-row dt {
  margin: 0;
  color: var(--muted);
  font-weight: 500;
}

.result-row dd {
  margin: 0;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.greeks-table {
  font-variant-numeric: tabular-nums;
}

.greeks-table th {
  font-weight: 600;
  color: var(--muted);
}

.calc-alert {
  margin-bottom: 1rem;
}

.calc-page .form-label {
  font-weight: 600;
}

.calc-page .form-control,
.calc-page .form-select {
  max-width: 100%;
}

.calc-actions {
  position: sticky;
  bottom: 0.75rem;
  z-index: 5;
  padding-top: 0.5rem;
}

.btn-calculate,
input[type="submit"].button,
input[type="submit"].btn,
.calc-page input[type="submit"] {
  background: var(--accent);
  border: 1px solid var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: 0.4rem;
  padding: 0.65rem 1.2rem;
  width: 100%;
}

.btn-calculate:hover,
input[type="submit"].button:hover,
.calc-page input[type="submit"]:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}

@media (min-width: 768px) {
  .btn-calculate,
  input[type="submit"].button,
  .calc-page input[type="submit"] {
    width: auto;
    min-width: 10rem;
  }
}

.disclaimer {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  margin: 2rem 0 0;
  padding: 0.75rem 1rem;
  height: auto;
  width: auto;
  max-width: 48rem;
  text-align: left;
  font-size: 0.9rem;
}

.error {
  color: #9b1c1c;
  background: #fdecec;
  border: 1px solid #f3c1c1;
  border-radius: 0.4rem;
  padding: 0.75rem 1rem;
  margin: 0 0 1rem;
  position: static;
}

/* Shared calculator grids — stack on phones, restore columns on desktop */
.wrapper,
.wrapper2,
.wrapper3,
.strategywrapper,
.impvolwrapper,
.volconverterwrapper,
.bondwrapper,
.bondwrapper2 {
  display: grid;
  gap: 0.65rem 1rem;
  position: static;
  left: auto;
  top: auto;
  float: none;
  width: 100%;
  max-width: 64rem;
  margin: 0 0 1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  padding: 1.15rem;
}

.wrapper,
.wrapper3,
.bondwrapper {
  grid-template-columns: 1fr;
}

.wrapper2,
.bondwrapper2 {
  display: none;
}

.strategywrapper,
.impvolwrapper,
.volconverterwrapper {
  grid-template-columns: 1fr;
}

.wrapper > p,
.wrapper3 > p,
.bondwrapper > p,
.strategywrapper > p,
.impvolwrapper > p,
.volconverterwrapper > p {
  display: none;
}

@media (min-width: 768px) {
  .strategywrapper > p,
  .impvolwrapper > p,
  .volconverterwrapper > p {
    display: block;
    margin: 0;
    padding: 0;
    min-height: 1px;
  }
}

@media (min-width: 992px) {
  .wrapper > p,
  .wrapper3 > p,
  .bondwrapper > p {
    display: block;
    margin: 0;
    padding: 0;
    min-height: 1px;
  }
}

.calc-page label,
.wrapper label,
.strategywrapper label,
.impvolwrapper label,
.volconverterwrapper label,
.bondwrapper label {
  color: var(--ink);
  text-align: left;
  font-weight: 600;
  margin: 0;
  position: static;
  left: auto;
}

.calc-page input[type="text"],
.calc-page input[type="number"],
.calc-page select,
.wrapper input[type="text"],
.wrapper input[type="number"],
.wrapper select,
.wrapper3 input[type="text"],
.wrapper3 input[type="number"],
.wrapper3 select,
.strategywrapper input[type="text"],
.strategywrapper input[type="number"],
.strategywrapper select,
.impvolwrapper input[type="text"],
.impvolwrapper input[type="number"],
.impvolwrapper select,
.volconverterwrapper input[type="text"],
.volconverterwrapper input[type="number"],
.volconverterwrapper select,
.bondwrapper input[type="text"],
.bondwrapper input[type="number"],
.bondwrapper select {
  width: 100%;
  max-width: 100%;
  display: block;
  box-sizing: border-box;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  background: #fff;
  color: var(--ink);
  font-size: 1rem;
}

.wrapper span,
.wrapper3 span,
.bondwrapper span,
.strategywrapper span,
.impvolwrapper span,
.volconverterwrapper span {
  font-variant-numeric: tabular-nums;
}

.chart {
  width: 100%;
  height: 360px;
  margin: 1.25rem 0;
}

.slider-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem 0.75rem;
  width: 100%;
  height: auto;
  margin: 0 0 1.25rem;
}

.slider-wrapper input,
.slider-wrapper span {
  width: 100%;
  height: auto;
  margin: 0;
  transform: none;
}

.bloc1 {
  max-width: 72rem;
}

@media (min-width: 768px) {
  .strategywrapper,
  .impvolwrapper {
    grid-template-columns: minmax(12rem, 16rem) minmax(10rem, 1fr);
    align-items: center;
  }

  .volconverterwrapper {
    grid-template-columns: minmax(12rem, 16rem) minmax(8rem, 1fr) minmax(8rem, 12rem);
    align-items: center;
  }

  .slider-wrapper {
    grid-template-columns: 10rem 1fr 6.5rem;
    align-items: center;
  }
}

@media (min-width: 992px) {
  .wrapper {
    grid-template-columns: minmax(11rem, 14rem) minmax(8rem, 12rem) 0 minmax(8rem, 11rem) minmax(5rem, 7rem) minmax(5rem, 7rem);
    align-items: center;
  }

  .wrapper2 {
    display: grid;
    grid-template-columns: minmax(5rem, 7rem) minmax(5rem, 7rem);
    justify-content: end;
    max-width: 64rem;
    background: transparent;
    border: 0;
    box-shadow: none;
    padding: 0 1.15rem;
    margin-bottom: 0;
  }

  .wrapper3 {
    grid-template-columns: minmax(11rem, 14rem) minmax(8rem, 12rem) 0 minmax(10rem, 13rem) minmax(6rem, 8rem) minmax(4rem, 6rem);
    align-items: center;
  }

  .bondwrapper {
    grid-template-columns: minmax(13rem, 16rem) minmax(8rem, 12rem) 0 minmax(10rem, 13rem) minmax(6rem, 9rem);
    align-items: center;
  }

  .bondwrapper2 {
    display: block;
    background: transparent;
    border: 0;
    box-shadow: none;
    padding: 0;
    margin: 0 0 0.5rem;
  }
}

/* Mortgage SEO content */
.calc-header-extra {
  color: var(--muted);
  max-width: 48rem;
}

.calc-seo {
  margin-top: 2.5rem;
}

.calc-seo h2 {
  font-size: 1.45rem;
  margin-bottom: 0.75rem;
}

.calc-seo > p {
  max-width: 48rem;
}

.formula-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  padding: 1rem 1.15rem;
  margin: 1rem 0 1.25rem;
  max-width: 48rem;
}

.formula-box .formula {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
  font-weight: 600;
  margin: 0 0 0.75rem;
}

.formula-legend {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--muted);
}

.example-card {
  height: 100%;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  padding: 1.15rem 1.2rem;
}

.example-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.example-card > p {
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.example-card dl {
  margin: 0.75rem 0 0;
}

.calc-page .accordion {
  max-width: 48rem;
}

.calc-page .accordion-item {
  border-color: var(--line);
  background: var(--card);
}

.calc-page .accordion-button {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 600;
  color: var(--ink);
  background: var(--card);
}

.calc-page .accordion-button:not(.collapsed) {
  background: var(--result);
  color: var(--ink);
  box-shadow: none;
}

.calc-page .accordion-button:focus {
  box-shadow: 0 0 0 0.2rem rgba(31, 107, 87, 0.25);
}

.calc-page .accordion-button::after {
  background-size: 1rem;
}

.calc-page .accordion-body {
  color: var(--ink);
}

.about-page a,
.calc-page a:not(.calc-card):not(.btn) {
  color: var(--accent);
}

.about-page a:hover,
.calc-page a:not(.calc-card):not(.btn):hover {
  color: var(--accent-hover);
}

/* About */
.about-page {
  padding: 2rem 0 3rem;
  max-width: 42rem;
}

.about-page h1 {
  margin-bottom: 1rem;
}

.about-page p {
  color: var(--ink);
  position: static;
  left: auto;
  top: auto;
}

/* Do not let the old global paragraph offset leak through */
p {
  position: static;
  left: auto;
  top: auto;
  color: inherit;
  text-align: left;
}

label {
  position: static;
  left: auto;
}

.button {
  position: static;
  top: auto;
  left: auto;
}