/* ═══════════════════════════════════════════════════════════════════════════
   library.css — the Library: fifty-nine lessons with typographic covers.
   ═══════════════════════════════════════════════════════════════════════ */
.page-library { --top: calc(var(--bar-h) + var(--bar-gap) * 2); }
.lb-hero { padding: calc(var(--top) + clamp(16px, 4vh, 40px)) 0 clamp(20px, 3vh, 32px); }
.lb-hero .wrap { display: grid; gap: 14px; }
.lb-hero .ph-title { font-size: clamp(2.6rem, 1.4rem + 5vw, 6rem); }
.lb-tools { display: grid; gap: 12px; margin-top: 8px; }
.lb-search input { width: min(100%, 520px); padding: 14px 18px; border: 1.5px solid var(--line-2); border-radius: 999px; font: inherit; font-size: 1rem; background: var(--cyc); }
.lb-search input:focus { outline: 0; border-color: var(--sound); box-shadow: 0 0 0 4px var(--sound-soft); }
.lb-filters { display: flex; flex-wrap: wrap; gap: 6px; }
.lb-filters button { padding: 8px 14px; border-radius: 999px; border: 1px solid var(--line-2); background: var(--cyc); font-family: var(--f-display); font-size: .88rem; color: var(--ink); font-variation-settings: 'opsz' 24, 'wdth' 100, 'wght' 620; transition: background .2s, border-color .2s, color .2s; }
.lb-filters button:hover { border-color: var(--ink); }
.lb-filters button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--cyc); }
.lb-filters button.prem[aria-pressed="true"] { background: var(--pen); border-color: var(--pen); color: var(--ink); }

.lb-shelf { padding: clamp(16px, 3vh, 32px) 0 clamp(48px, 8vh, 96px); }
.lb-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.lb-none { color: var(--ink-2); padding: 20px 0; }
.lesson { display: grid; grid-template-rows: auto 1fr; text-decoration: none; color: var(--ink); background: var(--cyc); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-1); transition: transform .35s var(--ease-out), box-shadow .35s, border-color .3s; }
.lesson:hover { transform: translateY(-5px); box-shadow: var(--shadow-2); border-color: var(--line-2); color: var(--ink); }
.lesson.hide { display: none; }
.cover { position: relative; aspect-ratio: 16 / 10; background: var(--cv, var(--cyc-2)); overflow: hidden; display: grid; align-items: end; padding: 14px 16px; }
.cover b { font-family: var(--f-display); font-size: clamp(2.2rem, 1.6rem + 2.4vw, 4rem); line-height: .9; letter-spacing: -.04em; color: var(--ink); font-variation-settings: 'opsz' 96, 'wdth' 100, 'wght' 800; white-space: nowrap; text-transform: uppercase; opacity: .92; }
.cover b.long { font-size: clamp(1.4rem, 1rem + 1.4vw, 2.2rem); letter-spacing: -.03em; font-variation-settings: 'opsz' 96, 'wdth' 78, 'wght' 800; }
.cover b.ipa { font-family: var(--f-ipa); text-transform: none; letter-spacing: -.02em; font-size: clamp(2.8rem, 2rem + 3vw, 5rem); }
.cover .tag { position: absolute; top: 12px; left: 12px; font-family: var(--f-display); font-size: .66rem; letter-spacing: .12em; text-transform: uppercase; padding: 5px 9px; border-radius: 999px; background: rgba(255, 255, 255, .8); color: var(--ink-2); font-variation-settings: 'opsz' 12, 'wdth' 90, 'wght' 650; }
.cover .tag.prem { background: var(--pen); color: var(--ink); }
.cover .n { position: absolute; top: 12px; right: 14px; font-family: var(--f-mono); font-size: .72rem; color: var(--ink-3); }
.lesson-body { display: grid; gap: 8px; padding: 16px 18px 18px; align-content: start; }
.lesson h3 { font-size: 1.12rem; letter-spacing: -.02em; line-height: 1.2; text-wrap: balance; }
.lesson p { color: var(--ink-2); font-size: .92rem; line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.lesson .tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 4px; }
.lesson .tags span { font-size: .72rem; color: var(--ink-3); padding: 3px 8px; border-radius: 999px; background: var(--cyc-2); }
.lesson .go { font-family: var(--f-display); font-size: .88rem; color: var(--sound); margin-top: 6px; font-variation-settings: 'opsz' 24, 'wdth' 100, 'wght' 650; }
@media (max-width: 1100px) { .lb-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 760px) { .lb-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; } .lesson-body { padding: 12px 14px 14px; } .lesson p { display: none; } }
@media (max-width: 420px) { .lb-grid { grid-template-columns: minmax(0, 1fr); } .lesson p { display: -webkit-box; } }