/* ==========================================================================
   FIELD GUIDE — Mobile-first. Pocket nature handbook.
   Designed for outdoor reading: high contrast, large type, dark mode toggle.
   ========================================================================== */

:root {
  /* Field-guide overrides */
  --bg: var(--paper);
  --surface: #ffffff;
  --text: #0d100c;
  --text-soft: #2d3d2c;
  --text-muted: #5a6e54;
  --rule: rgba(13, 16, 12, 0.18);
  --accent: #a04830;
  --accent-soft: rgba(184, 136, 72, 0.12);
}

[data-theme="dark"] {
  --bg: #0a0c08;
  --surface: #14180f;
  --text: #f3ecd4;
  --text-soft: #d8cfb8;
  --text-muted: #8a9b80;
  --rule: rgba(243, 236, 212, 0.22);
  --accent: #d6a064;
  --accent-soft: rgba(214, 160, 100, 0.14);
}

[data-theme="dark"] body { background: var(--bg); color: var(--text); }
[data-theme="dark"] body::before { display: none; }

.field {
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
}

/* Sticky control bar — always visible for the toggle */
.field-bar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
  padding: 0.85rem 1.1rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: center;
  transition: background 0.3s ease;
}

.field-bar__brand {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-soft);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.field-bar__brand svg {
  width: 18px;
  height: 18px;
  color: var(--accent);
}

.field-bar__lang {
  display: flex;
  gap: 0.25rem;
  justify-content: center;
}

.lang-pill {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  cursor: pointer;
  background: transparent;
  color: var(--text-soft);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  font-weight: 500;
}

.lang-pill[aria-pressed="true"] {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.theme-toggle {
  width: 38px;
  height: 38px;
  border: 1px solid var(--rule);
  background: transparent;
  border-radius: 999px;
  display: grid;
  place-items: center;
  cursor: pointer;
  color: var(--text);
  transition: background 0.2s ease, transform 0.3s ease;
}

.theme-toggle:hover { background: var(--accent-soft); }
.theme-toggle:active { transform: scale(0.92); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: block; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }

/* Hero */
.field-hero {
  padding: 2.5rem 1.25rem 2rem;
  border-bottom: 1px solid var(--rule);
}

.field-hero__eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.field-hero__eyebrow::before {
  content: "";
  width: 28px; height: 1px;
  background: var(--accent);
}

.field-hero__title {
  font-family: var(--display);
  font-size: clamp(2.5rem, 9vw, 4rem);
  line-height: 0.95;
  letter-spacing: -0.035em;
  font-weight: 320;
  font-variation-settings: "opsz" 144, "SOFT" 60;
  margin: 0 0 1rem;
  color: var(--text);
}

.field-hero__title em {
  font-style: italic;
  color: var(--accent);
  font-weight: 280;
}

.field-hero__lede {
  font-family: var(--display);
  font-size: 1.1875rem;
  line-height: 1.45;
  font-style: italic;
  font-variation-settings: "opsz" 96, "SOFT" 80;
  color: var(--text-soft);
  max-width: 36ch;
  margin: 0;
}

/* Section list — collapsible cards */
.principles-list {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.principle {
  border: 1px solid var(--rule);
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.principle:hover { border-color: var(--text-muted); }

.principle[open] { border-color: var(--accent); }

.principle summary {
  list-style: none;
  cursor: pointer;
  padding: 1.15rem 1.15rem 1.15rem 1.25rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.85rem;
  align-items: center;
  position: relative;
}

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

.principle__num {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  font-weight: 500;
}

.principle__title {
  font-family: var(--display);
  font-size: 1.5rem;
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 320;
  font-style: italic;
  color: var(--accent);
  font-variation-settings: "opsz" 96, "SOFT" 80;
}

.principle__title em {
  font-style: inherit;
  color: inherit;
  font-weight: inherit;
}

.principle__chev {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

.principle__chev svg { width: 14px; height: 14px; }
.principle[open] .principle__chev { transform: rotate(180deg); color: var(--accent); }

.principle__body {
  padding: 0 1.25rem 1.25rem;
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
  margin-top: 0.25rem;
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--text-soft);
}

/* Visual diagram for each principle */
.principle__visual {
  margin: 0 0 1.25rem;
  padding: 1.1rem 1rem;
  background: var(--accent-soft);
  border: 1px solid var(--rule);
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.principle__visual svg {
  width: 100%;
  max-width: 260px;
  height: auto;
  display: block;
  color: var(--text-muted);
}

.principle__visual .accent { color: var(--accent); }

.principle__visual::before {
  content: attr(data-caption);
  position: absolute;
  top: 0.55rem;
  left: 0.75rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.85;
  font-weight: 500;
}

.principle__body p { margin: 0 0 0.8em; }
.principle__body p:last-child { margin-bottom: 0; }
.principle__body em { color: var(--accent); font-style: italic; }
.principle__body strong { color: var(--text); font-weight: 500; }

.principle__body ul {
  list-style: none;
  padding: 0;
  margin: 0.8em 0;
}

.principle__body ul li {
  padding-left: 1.2em;
  position: relative;
  margin-bottom: 0.5em;
}

.principle__body ul li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: var(--mono);
}

.principle__try {
  margin-top: 1.1rem;
  padding: 0.9rem 1rem;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
}

.principle__try-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 500;
}

.principle__try p { margin: 0; color: var(--text); font-size: 0.95rem; }

/* Quick reference */
.quickref {
  margin-inline: 1.25rem;
  padding: 1.5rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--rule);
}

.quickref__head {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.quickref__title {
  font-family: var(--display);
  font-size: 1.75rem;
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 360;
  margin: 0 0 1.25rem;
  color: var(--text);
}

.quickref__title em { font-style: italic; color: var(--accent); }

.quickref__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
}

.quickref__item {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.8rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}

.quickref__item:last-child { border-bottom: 0; }

.quickref__item .n {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--text-muted);
}

.quickref__item .t {
  font-family: var(--display);
  font-size: 1.1875rem;
  letter-spacing: -0.01em;
  color: var(--text);
  font-weight: 360;
}

.quickref__item .t em { font-style: italic; color: var(--accent); }

.quickref__item .d {
  display: block;
  font-family: var(--body);
  font-size: 0.875rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.15rem;
}

/* Downloads */
.downloads {
  padding: 2rem 1.25rem 3rem;
}

.downloads__head {
  margin-bottom: 1.25rem;
}

.downloads__eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.downloads__title {
  font-family: var(--display);
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 360;
  margin: 0 0 0.75rem;
}

.downloads__title em { font-style: italic; color: var(--accent); }

.downloads__lede {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--text-muted);
  max-width: 38ch;
  margin: 0 0 1.25rem;
}

.dl-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--rule);
  margin-bottom: 0.85rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.dl-card:active { transform: scale(0.98); }
.dl-card:hover { border-color: var(--accent); }

.dl-card__flag {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border: 1px solid var(--rule);
  display: grid;
  place-items: center;
  font-family: var(--display);
  font-size: 1.4rem;
  font-weight: 320;
  font-style: italic;
  letter-spacing: -0.02em;
  color: var(--accent);
  background: var(--accent-soft);
}

.dl-card__main { flex: 1; min-width: 0; }

.dl-card__lang {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.dl-card__title {
  font-family: var(--display);
  font-size: 1.125rem;
  line-height: 1.2;
  letter-spacing: -0.015em;
  font-weight: 360;
  color: var(--text);
}

.dl-card__title em { font-style: italic; color: var(--accent); }

.dl-card__action {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
}

.dl-card__action svg { width: 14px; }

/* Tip card at bottom */
.tip {
  margin-top: 2rem;
  margin-bottom: 2rem;
  margin-inline: 1.25rem;
  padding: 1.25rem;
  border: 1px dashed var(--rule);
  text-align: center;
}

.tip__label {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.6rem;
  display: block;
}

.tip p {
  font-family: var(--display);
  font-size: 1.0625rem;
  font-style: italic;
  line-height: 1.4;
  margin: 0;
  color: var(--text-soft);
}

/* Footer */
.field-footer {
  padding: 2rem 1.25rem 3rem;
  border-top: 1px solid var(--rule);
  text-align: center;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.field-footer strong {
  display: block;
  font-family: var(--display);
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  font-style: italic;
  font-weight: 360;
  text-transform: none;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.field-footer__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  opacity: 0.7;
  transition: opacity 0.2s;
}
.field-footer__logo:hover { opacity: 1; }
.field-footer__logo img { display: block; }

.field-footer__copy {
  display: block;
  margin-top: 0.75rem;
  color: inherit;
  text-decoration: none;
}
.field-footer__copy:hover { color: var(--accent); }

/* Hide non-active language by default — scoped to body descendants
   so it doesn't match <html lang="…"> and hide the whole page. */
body [lang]:not(.is-shown) { display: none; }

/* Larger screens — tablet/desktop accommodate but stay mobile-feel */
@media (min-width: 720px) {
  .field-bar { padding: 1rem 2rem; }
  .field-hero { padding: 4rem 2rem 3rem; }
  .field-hero__title { font-size: clamp(3rem, 6vw, 4.5rem); }
  .principles-list { padding: 2rem; max-width: 720px; margin: 0 auto; }
  .quickref, .downloads, .tip { max-width: 720px; margin-left: auto; margin-right: auto; }
  .quickref { padding: 2rem; }
  .downloads, .tip { padding-left: 2rem; padding-right: 2rem; }
}