/* ============================================================
   Learn — searchable glossary ("search book")
   Matches the dark, aurora, indigo/violet look of the app.
   ============================================================ */
* { box-sizing: border-box; }

:root {
    --bg: #07080f;
    --card: rgba(255, 255, 255, 0.035);
    --card-brd: rgba(255, 255, 255, 0.08);
    --ink: #e8eaf2;
    --ink-dim: #b6bacb;
    --ink-faint: #7a8098;
    --indigo: #6366f1;
    --violet: #8b5cf6;
    --up: #22c55e;
    --down: #ef4444;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "Inter", system-ui, -apple-system, sans-serif;
    -webkit-font-smoothing: antialiased;
}

/* aurora backdrop (shared visual language with other pages) */
.aurora {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(60vw 40vh at 15% 0%, rgba(99, 102, 241, 0.18), transparent 60%),
        radial-gradient(50vw 40vh at 90% 10%, rgba(139, 92, 246, 0.14), transparent 60%),
        radial-gradient(40vw 30vh at 50% 100%, rgba(56, 189, 248, 0.08), transparent 60%);
    filter: saturate(1.1);
}

/* ---- header ---- */
.top {
    position: relative;
    z-index: 3;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 22px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    background: rgba(8, 9, 16, 0.6);
    backdrop-filter: blur(8px);
}
.brand {
    display: flex;
    align-items: center;
    gap: 9px;
    text-decoration: none;
    color: var(--ink);
    font-weight: 700;
    font-size: 18px;
    letter-spacing: -0.01em;
}
.brand b { color: var(--violet); }
.brand-mark {
    width: 17px;
    height: 17px;
    border-radius: 5px;
    background: linear-gradient(135deg, var(--indigo), var(--violet));
    box-shadow: 0 0 16px rgba(99, 102, 241, 0.6);
}
.brand-tag {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-faint);
    padding: 3px 8px;
    border: 1px solid var(--card-brd);
    border-radius: 999px;
}

/* ---- page shell ---- */
.wrap {
    position: relative;
    z-index: 2;
    max-width: 1120px;
    margin: 0 auto;
    padding: 30px 22px 80px;
}

/* ---- hero ---- */
.ln-hero {
    text-align: center;
    margin-bottom: 26px;
}
.ln-hero h1 {
    margin: 0 0 8px;
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 800;
    letter-spacing: -0.02em;
}
.ln-hero h1 .g { color: var(--indigo); }
.ln-hero h1 .b { color: var(--violet); }
.ln-hero p {
    margin: 0 auto;
    max-width: 620px;
    color: var(--ink-dim);
    font-size: 15.5px;
    line-height: 1.6;
}

/* ---- search box ---- */
.ln-searchbar {
    position: sticky;
    top: 12px;
    z-index: 5;
    margin: 22px auto 18px;
    max-width: 720px;
}
.ln-search-inner {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 4px 6px 4px 18px;
    background: rgba(16, 18, 32, 0.92);
    border: 1px solid rgba(139, 92, 246, 0.35);
    border-radius: 16px;
    box-shadow:
        0 18px 50px -24px rgba(99, 102, 241, 0.7),
        inset 0 1px 0 rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(10px);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.ln-search-inner:focus-within {
    border-color: rgba(139, 92, 246, 0.75);
    box-shadow: 0 22px 60px -22px rgba(139, 92, 246, 0.85);
}
.ln-search-ico { font-size: 19px; opacity: 0.85; }
#lnSearch {
    flex: 1;
    background: transparent;
    border: 0;
    outline: none;
    color: var(--ink);
    font-size: 17px;
    font-family: inherit;
    padding: 14px 0;
}
#lnSearch::placeholder { color: var(--ink-faint); }
.ln-clear {
    display: none;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border: 0;
    border-radius: 9px;
    background: rgba(255, 255, 255, 0.06);
    color: var(--ink-dim);
    font-size: 17px;
    cursor: pointer;
}
.ln-clear:hover { background: rgba(255, 255, 255, 0.12); color: var(--ink); }
.ln-kbd {
    flex: 0 0 auto;
    margin-right: 8px;
    font-size: 11px;
    color: var(--ink-faint);
    border: 1px solid var(--card-brd);
    border-radius: 6px;
    padding: 3px 7px;
    font-family: "JetBrains Mono", monospace;
}

/* ---- category chips ---- */
.ln-cats {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 14px;
}
.ln-cat {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 13px;
    border-radius: 999px;
    border: 1px solid var(--card-brd);
    background: var(--card);
    color: var(--ink-dim);
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: 0.16s;
}
.ln-cat:hover { border-color: rgba(139, 92, 246, 0.5); color: var(--ink); }
.ln-cat.active {
    background: linear-gradient(90deg, rgba(99, 102, 241, 0.28), rgba(139, 92, 246, 0.16));
    border-color: rgba(139, 92, 246, 0.65);
    color: #fff;
}
.ln-cat-ico { font-size: 13px; }
.ln-cat-n {
    font-size: 11px;
    color: var(--ink-faint);
    background: rgba(255, 255, 255, 0.06);
    border-radius: 999px;
    padding: 1px 7px;
}
.ln-cat.active .ln-cat-n { color: #e7e2ff; background: rgba(255, 255, 255, 0.15); }

.ln-count {
    text-align: center;
    color: var(--ink-faint);
    font-size: 12.5px;
    margin-bottom: 18px;
}

/* ---- results grid ---- */
.ln-results {
    display: grid;
    /* min() caps the track floor at the container width. A bare minmax(320px,1fr)
       keeps a 320px column even when only ~296px is available (a 320px-wide
       phone, minus gutters), so every card overflowed the page by ~20px. */
    grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr));
    gap: 14px;
}
.ln-card {
    background: var(--card);
    border: 1px solid var(--card-brd);
    border-radius: 15px;
    padding: 16px 17px 15px;
    transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
    scroll-margin-top: 90px;
}
.ln-card:hover {
    border-color: rgba(139, 92, 246, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 16px 36px -26px rgba(99, 102, 241, 0.9);
}
.ln-card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
}
.ln-term {
    margin: 0;
    font-size: 16.5px;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--ink);
}
.ln-def {
    margin: 0;
    color: var(--ink-dim);
    font-size: 14px;
    line-height: 1.62;
}
.ln-def b { color: var(--ink); font-weight: 700; }
.ln-def code, .ln-eg code {
    font-family: "JetBrains Mono", monospace;
    font-size: 12.5px;
    background: rgba(139, 92, 246, 0.14);
    color: #c9b8ff;
    padding: 1px 6px;
    border-radius: 5px;
}
.ln-eg {
    margin-top: 11px;
    padding: 9px 11px;
    background: rgba(99, 102, 241, 0.08);
    border-left: 2px solid var(--indigo);
    border-radius: 8px;
    font-size: 12.8px;
    color: var(--ink-dim);
    line-height: 1.55;
}
.ln-eg-tag {
    font-weight: 700;
    color: var(--indigo);
    margin-right: 6px;
    text-transform: uppercase;
    font-size: 10.5px;
    letter-spacing: 0.06em;
}

/* category chip on a card */
.ln-chip {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--ink-faint);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-brd);
    border-radius: 999px;
    padding: 3px 9px;
    white-space: nowrap;
}
.ln-chip-ico { font-size: 11px; }

mark {
    background: rgba(250, 204, 21, 0.28);
    color: #ffe27a;
    padding: 0 1px;
    border-radius: 3px;
}

/* deep-link flash */
.ln-flash {
    animation: lnFlash 1.6s ease;
}
@keyframes lnFlash {
    0%, 100% { border-color: var(--card-brd); }
    30% { border-color: rgba(139, 92, 246, 0.9); box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.25); }
}

/* ---- empty / web-fallback states ---- */
.ln-empty, .ln-web-wrap {
    grid-column: 1 / -1;
}
.ln-empty {
    text-align: center;
    padding: 46px 20px;
    color: var(--ink-dim);
}
.ln-empty-ico { font-size: 40px; margin-bottom: 12px; opacity: 0.8; }
.ln-empty p { margin: 4px 0; }
.ln-empty-sub { color: var(--ink-faint); font-size: 13px; }
.ln-empty b { color: var(--ink); }

/* the "searched the web for you" banner + card */
.ln-web-note {
    display: flex;
    align-items: center;
    gap: 9px;
    margin: 6px 0 14px;
    padding: 10px 14px;
    border: 1px dashed rgba(56, 189, 248, 0.4);
    border-radius: 12px;
    background: rgba(56, 189, 248, 0.06);
    color: #bfe6ff;
    font-size: 13px;
}
.ln-web-note.loading { border-color: rgba(139, 92, 246, 0.4); background: rgba(139, 92, 246, 0.07); color: #d6ccff; }
.ln-spin {
    width: 15px; height: 15px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--violet);
    border-radius: 50%;
    animation: lnSpin 0.7s linear infinite;
    flex: 0 0 auto;
}
@keyframes lnSpin { to { transform: rotate(360deg); } }

.ln-card.ln-web { border-color: rgba(56, 189, 248, 0.35); }
.ln-src {
    margin-top: 12px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: #7dd3fc;
    text-decoration: none;
}
.ln-src:hover { text-decoration: underline; }
.ln-src-badge {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ink-faint);
    border: 1px solid var(--card-brd);
    border-radius: 999px;
    padding: 2px 8px;
}
.ln-web-thumb {
    float: right;
    width: 84px;
    height: 84px;
    object-fit: cover;
    border-radius: 10px;
    margin: 0 0 8px 12px;
    border: 1px solid var(--card-brd);
}

.ln-hint {
    text-align: center;
    color: var(--ink-faint);
    font-size: 12px;
    margin-top: 40px;
}
.ln-hint kbd {
    font-family: "JetBrains Mono", monospace;
    border: 1px solid var(--card-brd);
    border-radius: 5px;
    padding: 1px 6px;
    color: var(--ink-dim);
}

@media (max-width: 640px) {
    .ln-results { grid-template-columns: 1fr; }
    .top { flex-wrap: wrap; }
    #lnSearch { font-size: 16px; }
    .ln-kbd { display: none; }
}