:root {
  --primary: #1a6b54;
  --primary-dark: #114a3a;
  --accent: #f2b705;
  --bg: #f7f9f8;
  --text: #20302b;
  --muted: #5d6f68;
  --card: #ffffff;
  --danger: #c0392b;
  --radius: 12px;
  --sidebar-width: 280px;
}

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

body {
  font-family:
    "Segoe UI",
    system-ui,
    -apple-system,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 1rem;
}

/* Skip link – hidden until keyboard focus */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  background: var(--primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 0 0 var(--radius) 0;
  white-space: nowrap;
}
.skip-link:focus,
.skip-link:focus-visible {
  left: 0;
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* Global focus-visible */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
.tool-card:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Invalid field states */
input[aria-invalid="true"],
select[aria-invalid="true"] {
  border-color: var(--danger);
  box-shadow: 0 0 0 1px var(--danger);
}

/* Header */
.site-header {
  background: var(--primary);
  color: #fff;
  padding: 0.75rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.brand {
  color: #fff;
  text-decoration: none;
  font-size: 1.3rem;
  font-weight: 700;
}
.brand span {
  color: var(--accent);
}
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 8px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.nav-toggle-bars {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 1px;
  transition:
    transform 0.2s ease,
    opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header nav {
  display: none;
  flex-direction: column;
  gap: 0;
  flex-basis: 100%;
  background: var(--primary-dark);
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 0.5rem 0;
  margin-top: 0.5rem;
}
.site-header nav.is-open {
  display: flex;
}
.site-header nav a {
  color: #e6f2ee;
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.6rem 1rem;
  display: block;
}
.site-header nav a.active,
.site-header nav a:hover {
  color: var(--accent);
}

.nav-heading {
  margin: 0;
  padding: 0.6rem 1rem 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.55);
}

@media (min-width: 641px) {
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    justify-content: flex-start;
    padding: 1rem;
    gap: 0.85rem;
    overflow: hidden;
    z-index: 100;
    background:
      radial-gradient(
        circle at top,
        rgba(255, 255, 255, 0.08),
        transparent 42%
      ),
      linear-gradient(180deg, #155c49 0%, var(--primary-dark) 100%);
  }
  .brand {
    display: block;
    padding: 0.95rem 1rem;
    font-size: 1.18rem;
    line-height: 1.3;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.06);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
    text-align: center;
    flex-shrink: 0;
  }
  .nav-toggle {
    display: none;
  }
  .site-header nav {
    display: flex;
    flex-direction: column;
    flex-basis: auto;
    width: 100%;
    min-width: 0;
    gap: 0.15rem;
    background: rgba(255, 255, 255, 0.06);
    padding: 0.55rem;
    margin-top: 0;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 18px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
  }
  .nav-heading {
    padding: 0.3rem 0.35rem 0.45rem;
    color: rgba(255, 255, 255, 0.62);
    text-align: center;
  }
  .site-header nav a {
    color: #e6f2ee;
    padding: 0.6rem 0.8rem;
    display: block;
    font-size: 0.95rem;
    line-height: 1.25;
    border-radius: 12px;
    border-left: 3px solid transparent;
    border-right: 3px solid transparent;
    text-align: center;
    transition:
      background 0.15s ease,
      color 0.15s ease,
      border-color 0.15s ease;
  }
  .site-header nav a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent);
  }
  .site-header nav a.active {
    background: rgba(242, 183, 5, 0.16);
    border-left-color: var(--accent);
    color: #fff1be;
    font-weight: 700;
  }
  body {
    padding-left: var(--sidebar-width);
    position: relative;
    z-index: 0;
  }
  .site-footer {
    position: relative;
    z-index: 0;
  }
  .skip-link:focus,
  .skip-link:focus-visible {
    left: var(--sidebar-width);
  }
}

/* Hero & cards */
.hero {
  text-align: center;
  padding: 2rem 0 1rem;
}
.hero h1 {
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
}
.hero p {
  color: var(--muted);
}
.tools-grid {
  display: grid;
  gap: 1rem;
  padding: 1.5rem 0;
}
@media (min-width: 640px) {
  .tools-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}
.tool-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-decoration: none;
  color: var(--text);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: transform 0.15s ease;
}
.tool-card:hover {
  transform: translateY(-3px);
}
.tool-card h2 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}
.tool-card p {
  font-size: 0.9rem;
  color: var(--muted);
}

/* Forms */
h1 {
  font-size: 1.5rem;
  margin: 1rem 0 0.5rem;
}
.intro {
  color: var(--muted);
  margin-bottom: 1.25rem;
}
.noscript-warning {
  background: #fff3cd;
  color: #664d03;
  border: 2px solid #997404;
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.95rem;
  line-height: 1.5;
}
.noscript-warning strong {
  color: #332701;
}
.calc-form {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.calc-form label {
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 0.6rem;
}
.calc-form input,
.calc-form select {
  padding: 0.6rem 0.75rem;
  border: 1px solid #cdd9d4;
  border-radius: 8px;
  font-size: 1rem;
  width: 100%;
}
.calc-form fieldset {
  border: 1px solid #e0e8e4;
  border-radius: 8px;
  padding: 0.75rem;
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.calc-form legend {
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0 0.4rem;
}
.input-row {
  display: flex;
  gap: 0.5rem;
}
.calc-form button {
  margin-top: 1rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.8rem;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}
.calc-form button:hover {
  background: var(--primary-dark);
}
.error {
  color: var(--danger);
  font-size: 0.9rem;
  min-height: 1.2em;
}

/* Results */
.result {
  background: var(--card);
  border-left: 5px solid var(--primary);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-top: 1.25rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}
.result.hidden {
  display: none;
}
.result h2 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}
.result table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.result th,
.result td {
  text-align: left;
  padding: 0.45rem 0.3rem;
  border-bottom: 1px solid #eef2f0;
}
.result td:last-child,
.result th:last-child {
  text-align: right;
}
.result .total td {
  font-weight: 700;
  border-top: 2px solid var(--primary);
}
.big-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  margin: 0.5rem 0;
}
.meter {
  background: #e6ece9;
  border-radius: 99px;
  height: 14px;
  overflow: hidden;
  margin: 0.75rem 0;
}
.meter > div {
  height: 100%;
  border-radius: 99px;
  background: var(--primary);
  transition: width 0.4s ease;
}
.meter.warn > div {
  background: var(--accent);
}
.meter.danger > div {
  background: var(--danger);
}
.suggestions {
  margin-top: 0.75rem;
  padding-left: 1.25rem;
  font-size: 0.92rem;
}

.result-aside {
  background: #f0f7f4;
  border-left: 4px solid var(--primary);
  padding: 0.75rem 1rem;
  margin-top: 0.75rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.92rem;
  color: var(--muted);
}

.result-sublabel {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-top: 0.6rem;
  margin-bottom: 0.15rem;
}

.result-note {
  font-size: 0.88rem;
  color: var(--muted);
  margin-top: 0.5rem;
  font-style: italic;
}

.result-success {
  color: var(--primary);
  font-weight: 700;
}

.result-danger {
  color: var(--danger);
  font-weight: 700;
}

.explainer-list {
  padding-left: 1.25rem;
  margin: 0.5rem 0 0.75rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.explainer-list li {
  margin-bottom: 0.3rem;
}

.meter-bar {
  background: #e6ece9;
  border-radius: 99px;
  height: 14px;
  overflow: hidden;
  margin: 0.75rem 0;
}

.meter-bar > div {
  height: 100%;
  border-radius: 99px;
  background: var(--primary);
  transition: width 0.4s ease;
}

/* Explainer & footer */
.explainer {
  margin: 1.5rem 0;
}
.explainer h2 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}
.explainer p {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 0.6rem;
}
.site-footer {
  background: var(--primary-dark);
  color: #cfe5dd;
  font-size: 0.85rem;
  padding: 1.25rem 1rem;
  margin-top: 2rem;
  text-align: center;
}
.site-footer p {
  max-width: 760px;
  margin: 0 auto 0.5rem;
}

/* Donation card */
.donation-card {
  background: #fef9e7;
  border-left: 5px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-top: 1.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}
.donation-kicker {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--primary);
  margin-bottom: 0.25rem;
}
.donation-copy h2 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
}
.donation-copy p {
  font-size: 0.92rem;
  color: var(--muted);
}
.donation-btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 700;
  min-height: 44px;
  line-height: 1.4;
  white-space: nowrap;
}
.donation-btn:hover {
  background: var(--primary-dark);
}
@media (min-width: 640px) {
  .donation-card {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .tool-card {
    transform: none !important;
  }
  .meter > div,
  .meter-bar > div {
    transition: none !important;
  }
}