/* Site-wide base styles. Mobile-first: base rules target ~360px phones,
   a single media query adds desktop refinements. No imports, no web fonts —
   pages must stay light for cheap devices on slow networks. */

:root {
  --color-bg: #f6f5f2;
  --color-surface: #ffffff;
  --color-text: #22262a;
  --color-text-muted: #5c6670;
  --color-border: #d9d6d0;
  --color-primary: #1f6f43;
  --color-primary-dark: #175635;
  --color-accent-bg: #eaf4ee;
  --color-error: #b4231f;
  --color-error-bg: #fbeeed;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;

  --radius: 8px;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--color-text);
  background: var(--color-bg);
}

/* --- Typography --- */

h1 {
  font-size: 1.5rem;
  line-height: 1.25;
  margin: 0 0 var(--space-3);
}

h2 {
  font-size: 1.2rem;
  margin: var(--space-6) 0 var(--space-3);
}

h3 {
  font-size: 1.05rem;
  margin: var(--space-5) 0 var(--space-2);
}

p {
  margin: 0 0 var(--space-4);
}

a {
  color: var(--color-primary);
}

a:hover {
  color: var(--color-primary-dark);
}

small,
.muted {
  color: var(--color-text-muted);
}

/* --- Layout --- */

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) 0;
}

.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}

.site-logo:hover {
  color: var(--color-text);
}

.logo-mark {
  flex-shrink: 0;
  color: var(--color-primary);
}

/* A dropdown keeps the header to one row however many calculators exist.
   Built on <details> so it works without JS; analytics.js adds
   close-on-outside-click and Escape. A plain "Guides" link sits next to
   the dropdown button. */
.site-nav {
  margin-left: auto;
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.site-nav .nav-link {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-1) 0;
}

.site-nav .nav-link:hover {
  color: var(--color-primary-dark);
}

.site-nav .nav-link[aria-current] {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-menu summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  user-select: none;
  -webkit-user-select: none;
}

.nav-menu summary::-webkit-details-marker {
  display: none;
}

.nav-menu summary::marker {
  content: "";
}

.nav-menu summary::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
}

.nav-menu summary:hover,
.nav-menu[open] summary {
  color: var(--color-primary-dark);
  border-color: var(--color-primary);
}

.nav-menu ul {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  margin: 0;
  padding: var(--space-1);
  list-style: none;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  min-width: 200px;
  z-index: 50;
}

.nav-menu ul a {
  display: block;
  font-size: 0.9rem;
  padding: var(--space-2) var(--space-3);
  border-radius: 6px;
  text-decoration: none;
  color: var(--color-text);
  white-space: nowrap;
}

.nav-menu ul a:hover {
  background: var(--color-bg);
  color: var(--color-primary-dark);
}

.nav-menu ul a[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
}

main.container {
  padding-top: var(--space-5);
  padding-bottom: var(--space-6);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* --- Hub hero --- */

.hero {
  background: var(--color-primary);
  color: #fff;
  border-radius: 12px;
  padding: var(--space-5) var(--space-4);
  margin: var(--space-5) 0;
}

.hero h1 {
  margin: 0 0 var(--space-2);
  color: #fff;
}

.hero p {
  margin: 0;
  color: rgba(255, 255, 255, 0.88);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-4);
  margin-top: var(--space-4);
}

.hero-cta {
  display: inline-block;
  background: #fff;
  color: var(--color-primary-dark);
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius);
  text-decoration: none;
}

.hero-cta:hover {
  background: var(--color-accent-bg);
  color: var(--color-primary-dark);
}

.hero-link {
  color: #fff;
  font-weight: 600;
}

.hero-link:hover {
  color: var(--color-accent-bg);
}

/* --- Hub sections --- */

.badge {
  display: inline-block;
  vertical-align: middle;
  margin-left: var(--space-2);
  font-size: 0.7rem;
  line-height: 1.5;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: var(--color-accent-bg);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary);
  border-radius: 999px;
  padding: 1px 10px;
}

.card-icon {
  display: block;
  width: 22px;
  height: 22px;
  margin-bottom: var(--space-2);
  color: var(--color-primary);
}

/* --- Hub page card grid --- */

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  padding: 0;
  margin: var(--space-4) 0;
  list-style: none;
}

.card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  text-decoration: none;
  color: inherit;
}

.card:hover,
.card:focus-visible {
  border-color: var(--color-primary);
}

.card h2,
.card h3 {
  margin: 0 0 var(--space-1);
  font-size: 1.05rem;
  color: var(--color-primary);
}

.card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* --- Forms --- */

form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  margin: var(--space-4) 0;
}

.field {
  margin-bottom: var(--space-4);
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: var(--space-1);
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-size: 1rem; /* keep >= 16px so mobile browsers don't zoom on focus */
  font-family: inherit;
  color: inherit;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

input:focus-visible,
select:focus-visible,
button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
}

.radio-group label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 400;
  margin: 0;
}

.button-primary {
  display: block;
  width: 100%;
  padding: var(--space-3);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
}

.button-primary:hover {
  background: var(--color-primary-dark);
}

.button-secondary {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--color-primary);
  background: transparent;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius);
  cursor: pointer;
}

/* --- Result block --- */

.result {
  background: var(--color-accent-bg);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius);
  padding: var(--space-4);
  margin: var(--space-4) 0;
}

.result-value {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary-dark);
}

.result-details {
  margin: var(--space-2) 0 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* --- Player progress chart --- */

.range-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-3) 0 var(--space-2);
}

.range-toggle button {
  font-family: inherit;
  font-size: 0.85rem;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text-muted);
  cursor: pointer;
}

.range-toggle button[aria-pressed="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  font-weight: 600;
}

.chart-box {
  margin: var(--space-2) 0 var(--space-3);
}

.chart-box svg {
  display: block;
}

/* Legend for multi-series charts (compare page). */
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  margin: var(--space-2) 0 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.chart-legend .legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 6px;
}

/* --- Inline errors --- */

.error {
  color: var(--color-error);
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-3);
  margin: var(--space-3) 0;
  font-size: 0.9rem;
}

/* --- Data tables (static example tables) --- */

.table-wrap {
  overflow-x: auto;
  margin: var(--space-4) 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: var(--color-surface);
}

caption {
  text-align: left;
  font-weight: 600;
  padding-bottom: var(--space-2);
}

th,
td {
  border: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-3);
  text-align: left;
}

th {
  background: var(--color-bg);
}

/* --- FAQ (details/summary) --- */

.faq details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--space-2);
}

.faq summary {
  padding: var(--space-3) var(--space-4);
  font-weight: 600;
  cursor: pointer;
}

.faq details > *:not(summary) {
  padding: 0 var(--space-4);
}

.faq details p:last-child {
  padding-bottom: var(--space-3);
}

/* --- Desktop enhancement --- */

@media (min-width: 600px) {
  h1 {
    font-size: 1.875rem;
  }

  .hero {
    padding: var(--space-6);
  }

  .site-nav {
    flex-basis: auto;
    margin-left: auto;
    overflow: visible;
  }

  .card-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
  }

  .button-primary {
    width: auto;
    padding: var(--space-3) var(--space-6);
  }
}