/* Warble UK — learning site
   Warble's forest-green palette, Vi Natura's photography-first layout. */

:root {
  --bg: #0d1f0e;
  --bg-2: #122318;
  --bg-3: #1a2e1b;
  --card: rgba(255, 255, 255, 0.045);
  --card-hover: rgba(255, 255, 255, 0.08);
  --line: rgba(232, 224, 208, 0.12);
  --text: #e8e0d0;
  --text-strong: #f4efe4;
  --muted: #a3b89a;
  --quiet: #7d9474;
  --green: #7ecf6e;
  --green-deep: #4a9e3a;
  --gold: #f5c842;
  --serif: Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius: 14px;
  --wrap: 1180px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; background: var(--bg); }
body {
  margin: 0;
  background: linear-gradient(170deg, var(--bg) 0%, var(--bg-2) 45%, var(--bg-3) 100%);
  min-height: 100vh;
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: var(--green); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--text-strong); }
h1, h2, h3 { font-family: var(--serif); font-weight: 400; color: var(--text-strong); line-height: 1.15; margin: 0; }
h1 em, h2 em, h3 em { color: var(--green); }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; background: var(--gold); color: var(--bg); padding: 8px 12px; z-index: 100; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ── Header ─────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13, 31, 14, 0.88);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand img { height: 40px; width: auto; }
.nav { display: flex; align-items: center; gap: 22px; font-size: 15px; }
.nav a { color: var(--text); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--green); }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 999px; border: 1px solid transparent;
  font: 600 15px/1 var(--sans); text-decoration: none; cursor: pointer;
}
.btn-primary { background: linear-gradient(135deg, var(--green-deep), var(--green)); color: var(--bg); }
.btn-primary:hover { color: var(--bg); filter: brightness(1.08); }
.btn-ghost { border-color: var(--line); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--green); color: var(--green); }
.nav .btn { padding: 9px 16px; font-size: 14px; }
@media (max-width: 640px) {
  .nav a:not(.btn) { display: none; }
  .nav a.nav-keep { display: inline; }
  .brand img { height: 34px; }
}

/* ── Hero ───────────────────────────────────────────────── */
.hero { position: relative; min-height: 78vh; display: flex; align-items: flex-end; overflow: hidden; }
.hero img.hero-photo { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 60% 40%; }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(13,31,14,0.15) 0%, rgba(13,31,14,0.35) 45%, rgba(13,31,14,0.96) 100%); }
.hero .wrap { position: relative; z-index: 1; padding-bottom: 64px; width: 100%; }
.hero h1 { font-size: clamp(44px, 7vw, 84px); max-width: 12ch; }
.hero p.lead { font-size: clamp(18px, 2vw, 21px); max-width: 38ch; color: var(--text); margin: 18px 0 28px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero .credit { position: absolute; right: 16px; bottom: 10px; z-index: 1; font-size: 11px; color: var(--quiet); }
.hero .credit a { color: var(--quiet); }

/* ── Sections ───────────────────────────────────────────── */
section.block { padding: 72px 0; }
section.block + section.block { border-top: 1px solid var(--line); }
.eyebrow { font: 600 12px/1 var(--sans); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; }
.block-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 28px; flex-wrap: wrap; }
.block-head h2 { font-size: clamp(30px, 4vw, 44px); }
.block-head p { margin: 8px 0 0; color: var(--muted); max-width: 52ch; }

/* ── Bird cards (gallery) ───────────────────────────────── */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 20px; }
.card {
  position: relative; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: background .2s, transform .2s;
}
.card:hover { background: var(--card-hover); transform: translateY(-2px); }
.card .photo { aspect-ratio: 4 / 3; overflow: hidden; background: var(--bg-2); }
.card .photo img { width: 100%; height: 100%; object-fit: cover; }
.card .body { padding: 14px 16px 16px; padding-right: 64px; }
.card h3 { font-size: 21px; }
.card h3 a { color: inherit; text-decoration: none; }
.card h3 a::after { content: ""; position: absolute; inset: 0; z-index: 1; }
.card .line { margin: 4px 0 0; font-size: 14px; color: var(--muted); line-height: 1.45; }
.card .play { position: absolute; right: 14px; bottom: 16px; z-index: 2; }
.card .mystery { display: none; }

.play {
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line);
  background: rgba(126, 207, 110, 0.12); color: var(--green);
  display: inline-grid; place-items: center; cursor: pointer; padding: 0;
}
.play:hover { background: rgba(126, 207, 110, 0.24); }
.play svg { width: 18px; height: 18px; }
.play .i-stop { display: none; }
.play.is-playing { background: var(--green); color: var(--bg); }
.play.is-playing .i-play { display: none; }
.play.is-playing .i-stop { display: block; }
.play-lg { width: auto; height: auto; border-radius: 999px; padding: 12px 22px 12px 18px; gap: 10px; display: inline-flex; align-items: center; font: 600 15px/1 var(--sans); }

/* Listen-first mode: hide names and photos until tapped */
.listen-first .card .photo img, .listen-first .card h3, .listen-first .card .line { visibility: hidden; }
.listen-first .card .mystery {
  display: grid; place-items: center; position: absolute; inset: 0 0 auto 0; aspect-ratio: 4 / 3;
  font: 400 64px/1 var(--serif); color: var(--quiet); pointer-events: none;
}
.listen-first .card .body::before { content: "Who's singing?"; font-family: var(--serif); font-size: 19px; color: var(--muted); }
.listen-first .card h3 a::after { visibility: visible; }
.listen-first .card.revealed .photo img, .listen-first .card.revealed h3, .listen-first .card.revealed .line { visibility: visible; }
.listen-first .card.revealed .mystery, .listen-first .card.revealed .body::before { display: none; }

/* List view */
.list-view .grid { grid-template-columns: 1fr; gap: 0; }
.list-view .card { display: grid; grid-template-columns: 72px 1fr; align-items: center; border-radius: 0; border-width: 0 0 1px; background: transparent; }
.list-view .card:hover { transform: none; background: var(--card); }
.list-view .card .photo { aspect-ratio: 1; width: 56px; margin: 10px 0 10px 8px; border-radius: 10px; }
.list-view .card .body { display: grid; grid-template-columns: minmax(150px, 1.1fr) minmax(130px, 1fr) 1.6fr; gap: 4px 20px; align-items: center; padding: 10px 70px 10px 6px; }
.list-view .card h3 { font-size: 19px; }
.list-view .card .latin { display: block; }
.list-view .card .months { display: flex; }
.list-view .card .line { margin: 0; }
.list-view .card .play { top: 50%; transform: translateY(-50%); bottom: auto; width: 40px; height: 40px; }
.list-view .listen-first .card .mystery, .list-view.listen-first .card .mystery { aspect-ratio: auto; inset: 10px auto 10px 8px; width: 56px; font-size: 28px; }
.card .latin, .card .months { display: none; }
.latin { font-family: var(--serif); font-style: italic; color: var(--muted); font-size: 15px; }
@media (max-width: 760px) {
  .list-view .card .body { grid-template-columns: 1fr; }
  .list-view .card .months, .list-view .card .line { display: none; }
}

/* Listening-station badges */
.card .photo { position: relative; }
.badge { position: absolute; left: 10px; top: 10px; z-index: 2; background: rgba(13,31,14,0.85); color: var(--text-strong); font: 600 12px/1 var(--sans); padding: 6px 9px; border-radius: 999px; }
.badge-new { background: var(--gold); color: var(--bg); }
.station-photo { display: grid; place-items: center; background: linear-gradient(135deg, rgba(126,207,110,0.14), rgba(255,255,255,0.03)); }
.station-name { font: italic 400 20px/1.3 var(--serif); color: var(--muted); padding: 0 18px; text-align: center; }
.card-station .body { padding-right: 16px; }
.station-note { margin: 14px 0 0; font-size: 15px; color: var(--muted); border-left: 2px solid var(--green); padding-left: 12px; }
.station-note strong { color: var(--text-strong); }

/* 12-month strip */
.months { display: flex; gap: 3px; align-items: flex-end; }
.months span { width: 14px; height: 18px; border-radius: 3px; background: rgba(255,255,255,0.07); font-size: 9px; line-height: 18px; text-align: center; color: var(--quiet); }
.months span.on { background: rgba(126, 207, 110, 0.55); color: var(--bg); font-weight: 700; }
.months span.now { outline: 1px solid var(--gold); }
.months-lg span { width: auto; flex: 1; height: 34px; line-height: 34px; font-size: 12px; border-radius: 6px; }

/* ── Explorer controls ─────────────────────────────────── */
.explorer-top { padding-top: 44px; padding-bottom: 8px; }
.explorer-top h1 { font-size: clamp(38px, 5vw, 60px); }
.explorer-top p { color: var(--muted); max-width: 60ch; }
.controls { position: relative; z-index: 20; background: rgba(13, 31, 14, 0.94); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); padding: 14px 0; border-bottom: 1px solid var(--line); }
.controls-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.search { flex: 1 1 260px; position: relative; }
.search input {
  width: 100%; padding: 11px 14px 11px 40px; border-radius: 999px; border: 1px solid var(--line);
  background: rgba(255,255,255,0.05); color: var(--text-strong); font: 16px var(--sans);
}
.search input::placeholder { color: var(--quiet); }
.search svg { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 16px; color: var(--quiet); }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.seg button { background: transparent; border: 0; color: var(--muted); padding: 9px 14px; font: 600 14px var(--sans); cursor: pointer; }
.seg button[aria-pressed="true"] { background: rgba(126,207,110,0.18); color: var(--green); }
.toggle { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; color: var(--muted); cursor: pointer; user-select: none; padding: 6px 4px; }
.toggle input { accent-color: var(--green); width: 16px; height: 16px; }
select.sort { background: rgba(255,255,255,0.05); color: var(--text); border: 1px solid var(--line); border-radius: 999px; padding: 9px 12px; font: 14px var(--sans); }
select.sort option { background: var(--bg-2); }
.filters-btn { display: none; }
.filters { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 12px; }
.fgroup { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.fgroup .flabel { font: 600 11px/1 var(--sans); letter-spacing: .14em; text-transform: uppercase; color: var(--quiet); margin-right: 2px; }
.chip {
  border: 1px solid var(--line); background: transparent; color: var(--muted); border-radius: 999px;
  padding: 6px 12px; font: 13px/1.2 var(--sans); cursor: pointer;
}
.chip:hover { border-color: var(--green); color: var(--text); }
.chip[aria-pressed="true"] { background: var(--green); border-color: var(--green); color: var(--bg); font-weight: 600; }
.results-bar { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 18px 0 14px; color: var(--muted); font-size: 14px; }
.results-bar button { background: none; border: 0; color: var(--green); cursor: pointer; font: inherit; text-decoration: underline; text-underline-offset: 3px; }
.empty { text-align: center; padding: 60px 0; color: var(--muted); }
.empty[hidden] { display: none; }
.az { display: none; position: sticky; top: 140px; float: right; margin-right: -6px; flex-direction: column; gap: 1px; font: 600 12px/1 var(--sans); }
.list-view .az { display: flex; }
.az a { color: var(--quiet); text-decoration: none; padding: 3px 6px; border-radius: 4px; }
.az a.has { color: var(--green); }
.az a.has:hover { background: rgba(126,207,110,0.15); }
.letter-anchor { scroll-margin-top: 200px; }
@media (max-width: 760px) {
  .filters-btn { display: inline-flex; }
  .filters { display: none; }
  .filters.open { display: flex; }
  .az { display: none !important; }
}
.collections { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; }

/* ── Bird page ──────────────────────────────────────────── */
.bird-hero { display: grid; grid-template-columns: 1.25fr 1fr; gap: 48px; align-items: center; padding: 44px 0 56px; }
.bird-hero figure { margin: 0; }
.bird-hero figure img { border-radius: var(--radius); width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; }
.bird-hero figcaption, .credit-line { font-size: 12px; color: var(--quiet); margin-top: 8px; }
.bird-hero figcaption a, .credit-line a { color: var(--quiet); }
.crumbs { font-size: 14px; color: var(--quiet); margin-bottom: 14px; }
.crumbs a { color: var(--muted); }
.bird-hero h1 { font-size: clamp(44px, 6vw, 72px); }
.bird-hero .latin { font-size: 20px; display: block; margin-top: 6px; }
.aka { color: var(--muted); font-size: 15px; margin: 6px 0 0; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 18px 0 24px; }
.tag { font-size: 13px; padding: 5px 11px; border-radius: 999px; background: rgba(255,255,255,0.06); color: var(--muted); }
.tag.level-1 { color: var(--green); } .tag.level-2 { color: var(--gold); } .tag.level-3 { color: #f0a070; }
.bird-hero .actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
@media (max-width: 860px) { .bird-hero { grid-template-columns: 1fr; gap: 24px; padding-top: 20px; } }

.notes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.note { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 28px; }
.note h2 { font-size: 26px; margin-bottom: 10px; }
.note p { margin: 0; font-size: 18px; }
.note.remember p { font-family: var(--serif); font-style: italic; font-size: 21px; color: var(--text-strong); }
@media (max-width: 760px) { .notes { grid-template-columns: 1fr; } }

.facts { display: grid; grid-template-columns: 180px 1fr; gap: 0; margin: 0; }
.facts dt, .facts dd { padding: 14px 0; border-bottom: 1px solid var(--line); margin: 0; }
.facts dt { color: var(--quiet); font-size: 14px; letter-spacing: .04em; }
.facts dd a { color: var(--text); }
@media (max-width: 560px) { .facts { grid-template-columns: 1fr; } .facts dt { border: 0; padding-bottom: 0; } }

.compare { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.compare .card .line { color: var(--text); }

.quiz-band { background: linear-gradient(135deg, rgba(74,158,58,0.25), rgba(126,207,110,0.08)); border: 1px solid rgba(126,207,110,0.3); border-radius: var(--radius); padding: 36px; display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; }
.quiz-band h2 { font-size: 32px; }
.quiz-band p { margin: 6px 0 0; color: var(--muted); }

.prevnext { display: flex; justify-content: space-between; gap: 16px; padding: 28px 0 0; font-size: 15px; }
.prevnext a { text-decoration: none; color: var(--muted); }
.prevnext a strong { display: block; font: 400 22px var(--serif); color: var(--text-strong); }
.prevnext a:hover strong { color: var(--green); }
.prevnext .next { text-align: right; margin-left: auto; }

/* ── Sign-up ────────────────────────────────────────────── */
.signup { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.signup form { display: flex; flex-wrap: wrap; gap: 10px; }
.signup input[type="email"] { flex: 1 1 220px; padding: 13px 16px; border-radius: 999px; border: 1px solid var(--line); background: rgba(255,255,255,0.06); color: var(--text-strong); font: 16px var(--sans); }
.signup .consent { flex-basis: 100%; font-size: 13px; color: var(--quiet); margin: 4px 0 0; }
.signup .consent a { color: var(--muted); }
.hidden-field { display: none; }
@media (max-width: 760px) { .signup { grid-template-columns: 1fr; gap: 20px; } }

/* ── Prose pages ────────────────────────────────────────── */
.prose { max-width: 720px; padding: 48px 0 80px; }
.prose h1 { font-size: clamp(38px, 5vw, 56px); margin-bottom: 20px; }
.prose h2 { font-size: 28px; margin: 36px 0 10px; }
.credits-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.credits-table th, .credits-table td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.credits-table th { color: var(--quiet); font-weight: 600; }
.credits-table td a { color: var(--text); }

/* ── Footer ─────────────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--line); padding: 44px 0 56px; color: var(--quiet); font-size: 14px; margin-top: 40px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px; }
.site-footer a { color: var(--muted); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 18px; }