:root {
  --ink: #20364c;
  --ink-soft: #566b7c;
  --paper: #fffaf0;
  --cream: #fff2db;
  --line: #dde4eb;
  --accent: #0086d6;
  --accent-text: #006aa8;
  --accent-pale: #e8f5ff;
  --accent-line: #c7e4f8;
  --icon-ink: #ffffff;
  --footer-accent: #a9dbff;
  --footer-muted: #c5d5e4;
  --shadow-rgb: 32, 54, 76;
  --coral: #ed8263;
  --coral-pale: #fff0e9;
  --spark-yellow: #ffe000;
  --white: #ffffff;
  font-family: "Trebuchet MS", "Avenir Next", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

:root[data-theme="green"] {
  --ink: #203d2c;
  --ink-soft: #577061;
  --line: #dce7de;
  --accent: #00ae42;
  --accent-text: #007d30;
  --accent-pale: #eaf9ed;
  --accent-line: #cbe9d1;
  --icon-ink: #203d2c;
  --footer-accent: #a4eabd;
  --footer-muted: #c7dbce;
  --shadow-rgb: 32, 61, 44;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; }
img, video { display: block; max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: var(--accent-text); }
button { font: inherit; }
:focus-visible { outline: 3px solid var(--coral); outline-offset: 4px; }

.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.site-header-inner, .page-shell, .site-footer-inner {
  width: min(100% - 48px, 1240px);
  margin-inline: auto;
}
.site-header-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 20px;
  min-height: 94px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); justify-self: start; }
.brand-symbol { width: 46px; height: 46px; flex: none; }
.brand-name { display: block; font-size: 27px; font-weight: 900; letter-spacing: -1.6px; line-height: 1; }
.brand-name .accent { color: var(--accent); }
.brand-tagline { display: block; margin-top: 5px; font-size: 11px; color: var(--ink-soft); letter-spacing: .035em; }
.header-label { font-size: 12px; font-weight: 900; text-transform: uppercase; letter-spacing: .15em; color: var(--ink-soft); text-align: center; }
.skip-link { position: absolute; top: -80px; left: 20px; z-index: 100; padding: 12px 20px; background: white; border: 2px solid var(--accent); border-radius: 10px; }
.skip-link:focus { top: 12px; }
.site-menu { position: relative; justify-self: end; z-index: 20; }
.site-menu summary { display: flex; align-items: center; justify-content: center; gap: 10px; list-style: none; border: 1px solid var(--accent-line); border-radius: 12px; padding: 12px 17px; min-height: 46px; background: var(--white); color: var(--accent-text); font-size: 14px; font-weight: 800; cursor: pointer; }
.site-menu summary::-webkit-details-marker { display: none; }
.site-menu summary:hover, .site-menu[open] summary { background: var(--accent-pale); border-color: var(--accent); }
.menu-chevron { display: block; flex: none; }
.site-menu[open] .menu-chevron { transform: rotate(180deg); }
.menu-links { position: absolute; top: calc(100% + 12px); right: 0; width: 250px; padding: 8px; background: white; border: 1px solid var(--line); border-radius: 18px; box-shadow: 0 15px 40px rgba(var(--shadow-rgb), .15); }
.menu-links a { display: block; padding: 14px 15px; border-radius: 11px; color: var(--ink); font-size: 15px; font-weight: 800; text-decoration: none; }
.menu-links a:hover, .menu-links a[aria-current="page"] { background: var(--accent-pale); color: var(--accent-text); }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px 24px; }

.page-intro { max-width: 780px; margin-bottom: 34px; }
.page-intro h1 { color: black; font-size: clamp(42px, 6vw, 68px); margin: 20px 0; line-height: 1.04; letter-spacing: -.055em; }
.page-intro > p { color: var(--ink-soft); font-size: 19px; line-height: 1.65; max-width: 650px; margin-bottom: 0; }
.content-grid, .tips-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.content-card { background: white; border: 1px solid var(--line); border-radius: 24px; padding: 32px; }
.content-card.pale { background: var(--accent-pale); border-color: var(--accent-line); }
.content-card h2 { font-size: 27px; letter-spacing: -.04em; line-height: 1.15; margin-bottom: 17px; }
.content-card p, .faq p { color: var(--ink-soft); font-size: 16px; line-height: 1.75; margin-bottom: 16px; }
.content-card p:last-child { margin-bottom: 0; }
.text-link { display: inline-block; font-weight: 800; text-underline-offset: 4px; margin-top: 5px; }
.primary-link { display: inline-block; padding: 14px 20px; background: var(--accent-pale); border: 1px solid var(--accent-line); color: var(--accent-text); border-radius: 13px; text-decoration: none; font-weight: 800; }
.primary-link:hover { border-color: var(--accent); }
.home-intro { max-width: 950px; margin-bottom: 30px; }
.home-intro h1 { color: #000; font-size: clamp(40px, 4.3vw, 54px); line-height: 1.04; letter-spacing: -.055em; margin: 18px 0; }
.featured-book { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1fr); align-items: center; gap: clamp(28px, 4.5vw, 64px); padding: clamp(24px, 2.7vw, 34px); border: 1px solid #c7e4f8; border-radius: 28px; background: #e8f5ff; }
.featured-cover { display: block; max-width: 380px; width: 100%; justify-self: center; border-radius: 4px 14px 14px 4px; box-shadow: 0 16px 32px rgba(var(--shadow-rgb), .14); overflow: hidden; transition: box-shadow .15s; }
.featured-cover:hover { box-shadow: 0 20px 40px rgba(var(--shadow-rgb), .2); }
.featured-cover img { width: 100%; height: auto; }
.cover-action { display: none; }
.featured-book-copy .small-label { margin-bottom: 13px; }
.featured-book-copy h2 { color: #000; font-size: clamp(30px, 3.3vw, 44px); line-height: 1.08; letter-spacing: -.045em; margin-bottom: 20px; }
.featured-book-copy h2 span { display: block; font-size: .67em; letter-spacing: -.025em; margin-top: 8px; }
.featured-book-copy p { max-width: 500px; color: var(--ink-soft); font-size: 17px; line-height: 1.65; margin-bottom: 17px; }
.featured-book-copy .companion-description { color: var(--ink); }
.featured-cta { display: inline-flex; align-items: center; justify-content: center; gap: 18px; padding: 16px 23px; min-height: 52px; background: var(--accent-text); border-color: var(--accent-text); color: white; margin-top: 5px; }
.featured-cta:hover { filter: brightness(.9); }
.featured-book-details { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-top: 20px; color: var(--ink-soft); font-size: 12px; line-height: 1.6; font-weight: 800; }
.home-about { display: flex; align-items: baseline; justify-content: flex-end; gap: 18px; padding-top: 28px; }
.home-about .text-link { margin: 0; white-space: nowrap; font-size: 14px; }
.tips-grid { grid-template-columns: repeat(3, 1fr); }
.tips-grid .content-card:nth-child(1) { background: #e8f4ff; border-color: #cddfee; }
.tips-grid .content-card:nth-child(2) { background: #eaf5e9; border-color: #d1e5ce; }
.tips-grid .content-card:nth-child(3) { background: #fff4cc; border-color: #eddfac; }
.tips-grid .content-card:nth-child(4) { background: #ffeadd; border-color: #efd2bf; }
.tips-grid .content-card:nth-child(5) { background: #f0eafe; border-color: #ded3ef; }
.tips-grid .content-card:nth-child(6) { background: #fce8ed; border-color: #edced7; }
.tips-grid h2 { text-align: center; }
.book-feature { display: grid; grid-template-columns: minmax(220px, .7fr) 1fr; align-items: center; gap: 44px; }
.book-feature > img { width: 100%; border-radius: 18px; }
.book-feature h2 { font-size: clamp(28px, 3.5vw, 42px); }
.book-feature .quiet-note { margin-top: 20px; font-size: 13px; }
.help-layout { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr); gap: 24px; align-items: start; }
.faq-list { display: grid; gap: 12px; }
.faq { background: white; border: 1px solid var(--line); border-radius: 18px; padding: 22px 24px; }
.faq summary { cursor: pointer; color: var(--ink); font-size: 17px; font-weight: 800; line-height: 1.5; }
.faq p { margin: 15px 0 0; }
.contact-email { display: inline-block; overflow-wrap: anywhere; font-size: 19px; font-weight: 800; margin: 4px 0 22px; text-underline-offset: 4px; }
.prose-card { max-width: 830px; }
.prose-card h2:not(:first-child) { margin-top: 30px; }
.index-toolbar { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 24px; padding-block: 24px; border-block: 1px solid var(--line); }
.bird-search { width: min(100%, 520px); }
.bird-search label { display: block; font-size: 13px; font-weight: 800; margin-bottom: 9px; }
.search-controls { display: flex; gap: 10px; }
.search-controls input { width: 100%; min-width: 0; min-height: 48px; padding: 12px 15px; font: inherit; border: 1px solid var(--line); background: white; color: var(--ink); border-radius: 12px; }
.search-controls button { padding: 10px 16px; border: 1px solid var(--accent-line); border-radius: 12px; background: var(--accent-pale); color: var(--accent-text); font-weight: 800; cursor: pointer; }
#search-count { color: var(--ink-soft); font-size: 14px; margin: 0 0 15px; white-space: nowrap; }
.bird-index-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 20px; }
.bird-index-card { display: flex; flex-direction: column; padding: 10px; background: white; border: 1px solid var(--line); border-radius: 20px; color: var(--ink); text-decoration: none; transition: border-color .15s; }
.bird-index-card:hover { border-color: var(--accent); }
.bird-index-card img { width: 100%; height: auto; aspect-ratio: 1; object-fit: contain; border-radius: 13px; }
.bird-index-card > div { padding: 12px 6px 8px; }
.index-number { display: block; color: var(--accent-text); font-size: 11px; font-weight: 800; margin-bottom: 8px; }
.bird-index-card h2 { font-size: 19px; letter-spacing: -.035em; line-height: 1.15; margin-bottom: 7px; }
.index-latin { display: block; font-size: 12px; color: var(--ink-soft); font-style: italic; line-height: 1.4; }
.empty-search { padding: 40px 0; color: var(--ink-soft); line-height: 1.7; }
[hidden] { display: none !important; }

.page-shell { padding-block: 42px 72px; }
.book-line {
  display: inline-flex; align-items: center; gap: 10px; font-size: 12px;
  font-weight: 900; text-transform: uppercase; letter-spacing: .17em; color: var(--accent);
}
.book-line::before { content: ""; width: 24px; height: 3px; background: #000000; border-radius: 6px; }
.title-row { display: flex; align-items: center; justify-content: space-between; gap: 28px; margin-top: 12px; margin-bottom: 30px; }
.bird-title { flex: 1; min-width: 0; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(44px, 7vw, 78px); letter-spacing: -.065em; line-height: .99; margin-bottom: 8px; }
.title-row h1 { color: #000000; }
.latin { font-size: clamp(17px, 2.2vw, 21px); font-style: italic; color: var(--ink-soft); margin: 0; }
.bird-counter { color: var(--ink-soft); font-weight: 800; font-size: 12px; white-space: nowrap; }
.bird-browser { flex: 0 0 290px; display: grid; gap: 9px; max-width: 100%; }
.bird-browser-label { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-inline: 2px; }
.bird-browser-label label { font-size: 12px; font-weight: 800; color: var(--ink); }
.bird-picker { width: 100%; min-height: 44px; padding: 10px 32px 10px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); color: var(--ink); font: inherit; font-size: 14px; font-weight: 800; cursor: pointer; }
.bird-step-links { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.bird-step { display: flex; align-items: center; justify-content: center; gap: 5px; min-height: 36px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--white); color: var(--ink); font-size: 12px; font-weight: 800; text-decoration: none; }
a.bird-step:hover { border-color: var(--accent); background: var(--accent-pale); }
.bird-step.is-disabled { opacity: .4; }
.bottom-bird-navigation { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
.bottom-bird-navigation .bird-step { flex-direction: column; align-items: flex-start; padding: 15px 18px; }
.bottom-bird-navigation .bird-step:last-child { align-items: flex-end; text-align: right; }
.bottom-bird-navigation .bird-step span { font-size: 11px; color: var(--ink-soft); }
.bottom-bird-navigation .bird-step strong { font-size: 15px; line-height: 1.3; }

.hero-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(330px, .8fr); gap: 24px; align-items: start; }
.card { background: var(--white); border: 1px solid var(--line); border-radius: 25px; box-shadow: 0 12px 36px rgba(var(--shadow-rgb), .055); overflow: hidden; }
.art-card { padding: 16px; }
.art-image-button {
  display: block; width: 100%; padding: 0; border: 0; background: var(--white);
  border-radius: 17px; cursor: zoom-in; overflow: hidden;
}
.art-image-button img { width: 100%; height: auto; aspect-ratio: 1; object-fit: contain; }
.art-caption { display: flex; justify-content: space-between; align-items: center; gap: 14px; padding: 14px 8px 2px; }
.art-caption strong { display: block; font-size: 16px; }
.art-caption span { display: block; margin-top: 3px; font-size: 13px; color: var(--ink-soft); }
.zoom-hint { border: 0; background: var(--accent-pale); color: var(--accent-text); border-radius: 999px; padding: 9px 13px; font-weight: 900; font-size: 12px; cursor: pointer; white-space: nowrap; }
.side-stack { display: grid; gap: 22px; }
.sound-card { padding: 27px; background: var(--accent-pale); border: 1px solid var(--accent-line); border-radius: 25px; }
.sound-top { display: flex; align-items: center; gap: 14px; }
.sound-icon { width: 54px; height: 54px; flex: none; display: grid; place-items: center; background: var(--accent); border-radius: 17px; color: var(--icon-ink); }
.small-label { color: var(--accent-text); font-size: 11px; font-weight: 900; text-transform: uppercase; letter-spacing: .18em; margin-bottom: 4px; }
.sound-card h2 { font-size: 26px; letter-spacing: -.04em; line-height: 1.1; margin: 0; }
.sound-card audio { display: block; width: 100%; height: 48px; margin-top: 20px; }
.media-heading { padding: 2px 4px 0; }
.media-heading h2 { font-size: 28px; letter-spacing: -.05em; margin: 0 0 6px; }
.media-heading p { font-size: 14px; line-height: 1.45; color: var(--ink-soft); margin: 0; }
.photos { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 14px; align-items: start; }
.photo-card { padding: 8px; margin: 0; }
.photo-button { display: block; border: 0; background: none; padding: 0; width: 100%; cursor: zoom-in; border-radius: 15px; overflow: hidden; }
.photo-button img { width: 100%; height: auto; object-fit: contain; }
.photo-caption { padding: 10px 4px 2px; font-size: 12px; font-weight: 800; line-height: 1.35; text-align: center; }

.video-section { margin-top: 28px; display: grid; grid-template-columns: 1fr .68fr; align-items: center; gap: 28px; background: var(--cream); border: 1px solid #efdfbf; border-radius: 25px; padding: 18px; }
.video-section video { width: 100%; aspect-ratio: 16 / 9; border-radius: 15px; object-fit: cover; background: var(--ink); }
.video-copy { padding: 10px 20px 10px 0; }
.video-copy h2 { font-size: clamp(26px, 3vw, 38px); letter-spacing: -.05em; line-height: 1.04; margin-bottom: 0; }
.video-caption { margin: 12px 0 0; color: var(--ink-soft); font-size: 17px; line-height: 1.4; }
.section-spark { display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 42px; border-radius: 50%; background: var(--accent); margin-bottom: 19px; }
.section-spark img { width: 18px; height: 18px; }
.section-spark img.bulb-icon { width: 24px; height: 24px; }
.site-footer { background: var(--ink); color: #f3f8ff; }
.site-footer-inner { min-height: 104px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-block: 24px; }
.footer-brand { font-size: 18px; font-weight: 900; letter-spacing: -.05em; }
.footer-brand span { color: var(--footer-accent); }
.site-footer a { color: #f3f8ff; text-underline-offset: 4px; font-size: 13px; font-weight: 800; }
.site-footer .footer-note { color: var(--footer-muted); font-size: 12px; margin-top: 5px; }

dialog { max-width: min(95vw, 1100px); max-height: 95vh; padding: 14px; border: none; border-radius: 17px; background: var(--white); box-shadow: 0 24px 90px rgba(0,0,0,.36); }
dialog::backdrop { background: rgba(23, 40, 58, .85); }
.lightbox-image { max-width: calc(95vw - 28px); max-height: calc(95vh - 100px); object-fit: contain; }
.lightbox-top { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin-bottom: 10px; }
.lightbox-top strong { font-size: 15px; }
.close-button { background: var(--ink); color: white; border: 0; width: 34px; height: 34px; border-radius: 50%; cursor: pointer; font-size: 20px; line-height: 1; }

.credits-page { max-width: 830px; }
.credits-page h1 { font-size: clamp(42px, 6vw, 64px); margin: 14px 0 18px; }
.credits-intro { color: var(--ink-soft); line-height: 1.65; margin-bottom: 32px; }
.credits-list { display: grid; gap: 14px; }
.credit-item { padding: 20px 24px; border: 1px solid var(--line); background: white; border-radius: 18px; }
.credit-item h2, .credit-item h3 { font-size: 19px; letter-spacing: -.02em; margin-bottom: 8px; }
.credit-item p { font-size: 14px; line-height: 1.6; margin: 0; }
.credit-item .credit-detail { margin-top: 6px; color: var(--ink-soft); }
.back-link { display: inline-block; margin-bottom: 24px; font-weight: 800; text-decoration: none; }
.bird-credit-group { scroll-margin-top: 24px; margin-top: 44px; }
.bird-credit-group > h2 { font-size: 29px; letter-spacing: -.04em; margin-bottom: 10px; }

@media (max-width: 1050px) {
  .bird-index-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .tips-grid { grid-template-columns: 1fr 1fr; }
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(310px, .85fr); gap: 18px; }
  .photos { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .site-header-inner, .page-shell, .site-footer-inner { width: min(100% - 30px, 600px); }
  .site-header-inner { grid-template-columns: 1fr auto; min-height: 104px; gap: 12px; padding-block: 15px 13px; }
  .brand-symbol { width: 39px; height: 39px; }
  .brand-name { font-size: 23px; }
  .brand-tagline { font-size: 10px; }
  .header-label { grid-column: 1 / -1; grid-row: 2; font-size: 10px; }
  .site-menu { grid-column: 2; grid-row: 1; }
  .site-menu summary { min-height: 44px; padding: 10px 14px; gap: 10px; }
  .content-grid, .help-layout, .book-feature { grid-template-columns: 1fr; }
  .content-card { padding: 25px; }
  .book-feature { gap: 24px; }
  .book-feature > img { max-width: 300px; justify-self: center; }
  .home-intro { margin-bottom: 26px; }
  .featured-book { grid-template-columns: 1fr; gap: 29px; padding: 24px; border-radius: 23px; }
  .featured-cover { max-width: 360px; }
  .cover-action { display: flex; align-items: center; justify-content: center; gap: 18px; min-height: 48px; padding: 13px; background: var(--accent-text); color: white; font-size: 15px; font-weight: 800; }
  .featured-book-copy h2 { font-size: clamp(30px, 6vw, 40px); }
  .featured-book-copy p { font-size: 16px; }
  .home-about { align-items: flex-start; flex-direction: column; gap: 8px; }
  .page-intro > p { font-size: 17px; }
  .bird-index-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
  .bird-index-card h2 { font-size: 17px; }
  .index-toolbar { align-items: stretch; flex-direction: column; gap: 14px; }
  #search-count { margin-bottom: 0; }
  .page-shell { padding-top: 32px; padding-bottom: 45px; }
  .title-row { flex-direction: column; align-items: stretch; gap: 22px; margin-bottom: 22px; }
  .bird-browser { flex: none; width: 100%; }
  .hero-grid { grid-template-columns: 1fr; gap: 19px; }
  .art-card { padding: 10px; }
  .art-caption { padding: 10px 8px 5px; }
  .side-stack { gap: 20px; }
  .photos { grid-template-columns: 1fr 1fr; }
  .video-section { grid-template-columns: 1fr; gap: 12px; padding: 12px; }
  .video-copy { padding: 12px 10px 17px; }
  .section-spark { margin-bottom: 10px; }
  .site-footer-inner { flex-wrap: wrap; }
}
@media (max-width: 490px) {
  .bird-index-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .bird-index-card { padding: 8px; border-radius: 17px; }
  .bird-index-card > div { padding: 10px 4px 7px; }
  .tips-grid { grid-template-columns: 1fr; }
  .footer-links { flex-direction: column; gap: 18px; }
  .photos { grid-template-columns: 1fr; }
  .sound-card { padding: 21px; }
  .art-caption strong { font-size: 14px; }
  .art-caption span { font-size: 12px; }
  .zoom-hint { font-size: 11px; padding: 8px 10px; }
  .book-line { font-size: 10px; letter-spacing: .11em; }
  .bottom-bird-navigation { gap: 10px; }
  .bottom-bird-navigation .bird-step { padding: 12px; }
  .bottom-bird-navigation .bird-step strong { font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }