:root {
    --kt-paper: #fbf9f3;
    --kt-cream: #f3eee2;
    --kt-ink:   #1f1d1a;
    --kt-amber: #d97706;
}

html { scroll-behavior: smooth; }

/* Compact, multi-column song list on the book detail page.
   Falls back to a single column on narrow screens; columns grow as the
   viewport widens so a 700-song book stays scannable. */
.kt-songlist {
    column-count: 1;
    column-gap: 0.75rem;
    column-fill: balance;
}
@media (min-width: 640px)  { .kt-songlist { column-count: 2; } }
@media (min-width: 1024px) { .kt-songlist { column-count: 3; } }
.kt-songlist > li {
    break-inside: avoid;
}
.kt-songlist > li > a {
    width: 100%;
}

/* Reduce harsh edges around scanned page images */
.kt-page img,
img.kt-cover { background: #ffffff; }

/* ---------- Reader layout ---------- */
body.is-reader {
    background: #1f1d1a;
    color: #f3eee2;
    overflow: hidden;
}

.kt-reader {
    display: grid;
    grid-template-rows: auto 1fr auto;
    height: calc(100vh - 4rem); /* leave header */
    height: calc(100dvh - 4rem);
}
body.is-reader.kt-fs .kt-reader { height: 100vh; height: 100dvh; }
body.is-reader.kt-fs header { display: none; }

.kt-reader-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: rgba(31, 29, 26, 0.85);
    border-bottom: 1px solid rgba(243, 238, 226, 0.08);
    color: #f3eee2;
    backdrop-filter: blur(6px);
}
.kt-reader-title {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 1px;
    line-height: 1.15;
}
.kt-reader-title > span:first-child {
    color: #fbf9f3;
    font-size: 0.95rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.kt-reader-actions { display: flex; gap: 0.4rem; }

.kt-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    height: 2.25rem;
    padding: 0 0.85rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    background: transparent;
    color: inherit;
}
.kt-btn-ghost {
    color: rgba(243, 238, 226, 0.85);
    border-color: rgba(243, 238, 226, 0.15);
}
.kt-btn-ghost:hover {
    background: rgba(243, 238, 226, 0.08);
    color: #fff;
}

.kt-reader-stage {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 1rem;
}

.kt-spread {
    display: flex;
    gap: 0;
    height: 100%;
    max-width: 100%;
    align-items: stretch;
    box-shadow: 0 18px 60px rgba(0,0,0,0.5);
    background: #fff;
    transition: opacity 0.18s ease, transform 0.18s ease;
}
.kt-spread.is-changing { opacity: 0; transform: scale(0.985); }
.kt-page {
    flex: 1 1 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    overflow: hidden;
    min-width: 0;
    min-height: 0;
}
.kt-page img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    display: block;
    object-fit: contain;
}
.kt-page-left { border-right: 1px solid rgba(0,0,0,0.06); }
.kt-page.is-blank { background: transparent; box-shadow: none; }
.kt-page.is-blank img { display: none; }

@media (max-width: 720px) {
    /* On narrow screens collapse to single page */
    .kt-page-left { display: none; }
    .kt-page-right { flex: 1 1 100%; }
    .kt-spread { gap: 0; }
}

/* Explicit single-page mode (when the URL carries ?p=) — collapse to one page
   on every screen size. */
.kt-reader-single .kt-page-left { display: none; }
.kt-reader-single .kt-page-right { flex: 1 1 100%; }
.kt-reader-single .kt-spread { gap: 0; }

.kt-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    background: rgba(31,29,26,0.55);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.15s, transform 0.15s;
    z-index: 5;
}
.kt-nav:hover { background: rgba(217, 119, 6, 0.85); }
.kt-nav:disabled { opacity: 0.25; cursor: default; background: rgba(31,29,26,0.4); }
.kt-nav-prev { left: 1rem; }
.kt-nav-next { right: 1rem; }

.kt-reader-foot {
    padding: 0.5rem 1rem 0.75rem;
    background: rgba(31,29,26,0.85);
    border-top: 1px solid rgba(243,238,226,0.08);
}
.kt-slider {
    width: 100%;
    accent-color: var(--kt-amber);
}

.kt-thumbs {
    position: fixed;
    inset: 0;
    background: rgba(31,29,26,0.97);
    z-index: 50;
    overflow: auto;
    padding: 4rem 1.5rem 2rem;
}
.kt-thumbs-close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
}
.kt-thumbs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 0.75rem;
    max-width: 1200px;
    margin: 0 auto;
}
.kt-thumb {
    background: #fff;
    border-radius: 0.5rem;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.15s, border-color 0.15s;
    aspect-ratio: 3 / 4;
    display: flex;
    align-items: stretch;
    justify-content: stretch;
    position: relative;
}
.kt-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.kt-thumb:hover { transform: translateY(-2px); border-color: rgba(217,119,6,0.6); }
.kt-thumb.is-current { border-color: var(--kt-amber); }
.kt-thumb-num {
    position: absolute;
    bottom: 4px;
    right: 6px;
    background: rgba(31,29,26,0.7);
    color: #fff;
    font-size: 11px;
    padding: 1px 6px;
    border-radius: 8px;
    font-variant-numeric: tabular-nums;
}