/* ════════════════════════════════════════════════════════════════════════
   Layer 2 — Library, Catalog & immersive reader shell
   Colour is fully token-driven (see theme.css). No colour hex lives here.
   ════════════════════════════════════════════════════════════════════════ */

/* ── Top app bar + tabs ── */
.appbar {
    position: sticky;
    top: 0;
    z-index: 500;
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 10px 22px;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--nav-border);
}
.appbar-brand { display: flex; align-items: center; gap: 9px; }
.appbar-logo { height: 30px; width: auto; }
.appbar-word { color: var(--logo); font-weight: 700; font-size: 1.15rem; letter-spacing: 0.5px; }

.tabbar { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.tab {
    padding: 8px 20px;
    border: none;
    border-radius: 22px;
    background: transparent;
    color: var(--tab-idle);
    font-size: 0.98rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}
.tab:hover { background: var(--accent-soft); color: var(--text); }
.tab.active { background: var(--tab-active-bg); color: var(--tab-active-fg); }
/* SightReadle is the sidecar — the quietest of the three. */
.tab-sidecar {
    margin-left: 10px;
    padding: 7px 15px;
    font-size: 0.86rem;
    font-weight: 500;
    color: var(--tab-sidecar);
}
.tab-sidecar .tab-sidecar-dot { opacity: 0.6; }
.tab-sidecar.active { background: var(--tab-active-bg); color: var(--tab-active-fg); }

/* ── Views ── */
.tab-view { display: none; }
.tab-view.active { display: block; }
#view-library, #view-catalog { max-width: 1200px; margin: 0 auto; padding: 28px 22px 60px; }

.lib-head, .cat-head { margin-bottom: 22px; }
.lib-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; }
.lib-title { color: var(--text-strong); font-size: 2rem; letter-spacing: 0.5px; }
.lib-sub { color: var(--text-subtle); font-size: 0.98rem; }

.btn-primary {
    padding: 10px 18px; border: none; border-radius: 10px;
    background: var(--btn-primary-bg); color: var(--btn-primary-fg);
    font-weight: 700; font-size: 0.95rem; cursor: pointer;
    box-shadow: var(--shadow-card); transition: background 0.15s, transform 0.1s;
}
.btn-primary:hover { background: var(--btn-primary-bg-hover); }
.btn-primary:active { background: var(--accent-press); transform: translateY(1px); }
.btn-primary:disabled { opacity: 0.55; cursor: default; }
.btn-ghost {
    padding: 10px 16px; border: 1.5px solid var(--btn-ghost-border); border-radius: 10px;
    background: transparent; color: var(--btn-ghost-fg); font-weight: 600; font-size: 0.95rem; cursor: pointer;
    transition: background 0.15s;
}
.btn-ghost:hover { background: var(--accent-soft); }

/* ── Library grid ── */
.lib-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 18px;
}
.lib-card {
    background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 14px; overflow: hidden;
    box-shadow: var(--card-shadow); display: flex; flex-direction: column;
    transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.lib-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-pop); background: var(--card-bg-hover); }
.lib-card-thumb {
    height: 120px; background: linear-gradient(135deg, var(--thumb-from), var(--thumb-to));
    display: flex; align-items: center; justify-content: center; position: relative; cursor: pointer;
}
.lib-card-glyph { font-size: 2.6rem; color: var(--thumb-note); }
.lib-card-pages {
    position: absolute; bottom: 8px; right: 10px; font-size: 0.72rem; font-weight: 700;
    color: var(--badge-fg); background: var(--badge-bg); padding: 2px 7px; border-radius: 10px;
}
.lib-card-body { padding: 12px 13px 11px; display: flex; flex-direction: column; gap: 5px; flex: 1; }
.lib-card-title { font-weight: 700; color: var(--card-title); font-size: 0.98rem; line-height: 1.25; cursor: pointer;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.lib-card-composer { color: var(--card-meta); font-size: 0.84rem; }
.lib-card-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 2px; }
.tag { font-size: 0.68rem; font-weight: 700; padding: 2px 7px; border-radius: 8px; text-transform: uppercase; letter-spacing: 0.02em; }
/* Neutral pills (source / imported / catalog / status / difficulty) share the
   subtle treatment; only "Playable" gets gilt — accent discipline. */
.tag-source, .tag-catalog, .tag-imported, .tag-status, .tag-diff {
    background: var(--tag-catalog-bg); color: var(--tag-catalog-fg);
}
.tag-playable { background: var(--tag-playable-bg); color: var(--tag-playable-fg); }
.lib-card-foot { margin-top: auto; padding-top: 8px; border-top: 1px solid var(--card-divider);
    display: flex; align-items: center; justify-content: space-between; }
.lib-card-resume { font-size: 0.76rem; color: var(--card-foot); }
.lib-card-btns { display: flex; gap: 4px; }
.icon-btn { border: none; background: transparent; border-radius: 7px; width: 28px; height: 28px; cursor: pointer;
    font-size: 0.85rem; color: var(--card-icon); transition: background 0.15s, color 0.15s; }
.icon-btn:hover { background: var(--accent-soft); color: var(--card-icon-hover); }
.icon-btn[data-remove]:hover { background: var(--danger-soft); color: var(--danger); }

/* Empty state */
.lib-empty { grid-column: 1 / -1; text-align: center; color: var(--text); padding: 60px 20px; }
.lib-empty-art { font-size: 3.5rem; margin-bottom: 12px; }
.lib-empty h2 { font-size: 1.5rem; margin-bottom: 8px; color: var(--text-strong); }
.lib-empty p { color: var(--text-muted); margin-bottom: 20px; }
.lib-empty-cta { display: flex; gap: 12px; justify-content: center; }

/* ── Catalog grid ── */
.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.cat-card {
    background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 14px; padding: 16px 16px 14px;
    box-shadow: var(--card-shadow); display: flex; flex-direction: column; gap: 12px;
    transition: background 0.15s, box-shadow 0.15s;
}
.cat-card:hover { background: var(--card-bg-hover); box-shadow: var(--shadow-pop); }
.cat-card-title { font-weight: 700; color: var(--card-title); font-size: 1.02rem; line-height: 1.3; }
.cat-card-composer { color: var(--card-meta); font-size: 0.86rem; margin-top: 3px; }
.cat-card-btns { display: flex; gap: 8px; margin-top: auto; }
.cat-card-btns .btn-primary { flex: 1; box-shadow: none; }
.cat-card-btns .btn-primary:disabled { background: var(--gilt-soft); color: var(--gilt); opacity: 1; }
.cat-card-btns .btn-ghost { border-color: var(--border-strong); color: var(--text-muted); }

/* ── Edit modal ── */
.modal-backdrop { position: fixed; inset: 0; z-index: 3000; background: var(--scrim);
    display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal { background: var(--surface-raised); border: 1px solid var(--border); border-radius: 14px; padding: 22px;
    width: 380px; max-width: 100%; box-shadow: var(--shadow-pop); color: var(--text); }
.modal h3 { margin-bottom: 16px; color: var(--text-strong); }
.modal label { display: block; font-size: 0.8rem; color: var(--text-muted); font-weight: 600; margin-bottom: 12px; }
.modal input, .modal select { width: 100%; margin-top: 4px; padding: 9px 10px; border: 1px solid var(--border);
    border-radius: 8px; font-size: 0.92rem; font-weight: 400; color: var(--text); background: var(--input-bg); }
.modal input:focus, .modal select:focus { outline: 2px solid var(--focus-ring); outline-offset: 1px; border-color: transparent; }
.modal-btns { display: flex; justify-content: flex-end; gap: 10px; margin-top: 8px; }
.modal-btns .btn-ghost { border-color: var(--border-strong); color: var(--text-muted); }

/* ── Immersive reader ── */
#reader-root { position: fixed; inset: 0; z-index: 2000; background: var(--reader-surround); }
#reader-root.hidden { display: none; }
.rd-stage { position: absolute; inset: 0; display: flex; touch-action: pan-y; overflow: auto;
    -webkit-overflow-scrolling: touch; }
/* margin:auto centers when the page fits and still allows scrolling to every edge
   when zoomed in (unlike justify/align-center, which clips overflow). The wrap
   holds the PDF canvas + the annotation overlay, kept in perfect register. */
.rd-page-wrap { margin: auto; position: relative; flex: 0 0 auto; }
#rd-canvas { display: block; box-shadow: var(--reader-page-shadow); background: var(--reader-page); }
#rd-overlay { position: absolute; inset: 0; pointer-events: none; }
#reader-root.zoomed .rd-stage { touch-action: pan-x pan-y; } /* pan the enlarged page in both axes */

/* While a drawing tool is active: overlay captures ink, edge tap-zones off. */
#reader-root.tool-draw #rd-overlay { pointer-events: auto; touch-action: none; }
#reader-root.tool-draw .rd-tap { display: none; }

/* Inline text-tool input */
.rd-text-input { position: absolute; z-index: 7; min-width: 40px; padding: 1px 3px;
    border: 1px solid var(--accent); border-radius: 4px; background: rgba(255,255,255,.9);
    font: 600 14px ui-sans-serif, system-ui, sans-serif; outline: none; }

/* ── Annotation tool strip (persistent, ambient, draggable) ──
   Vertical by default and parked on a side so it never covers the low staves;
   drag the grip to move it anywhere (position is remembered). */
#rd-tools {
    position: absolute; z-index: 6; display: flex; flex-direction: column; align-items: center; gap: 8px;
    max-height: calc(100vh - 20px); overflow-y: auto; overflow-x: hidden;
    padding: 4px 6px 8px; border-radius: 14px;
    background: var(--reader-toolbar-bg); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border);
}
.rd-drag { width: 34px; height: 20px; display: flex; align-items: center; justify-content: center;
    color: var(--text-subtle); cursor: grab; font-size: 1rem; line-height: 1; touch-action: none; user-select: none; }
.rd-drag:active { cursor: grabbing; }
.rd-tgroup { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.rd-tgroup + .rd-tgroup { border-top: 1px solid var(--border); padding-top: 8px; }
.rd-tool { width: 34px; height: 34px; border: 1px solid transparent; border-radius: 9px;
    background: transparent; color: var(--reader-toolbar-fg); font-size: 1rem; cursor: pointer;
    display: inline-flex; align-items: center; justify-content: center; }
.rd-tool:hover { background: var(--accent-soft); }
.rd-tool.on { background: var(--accent); color: var(--text-on-accent); border-color: var(--accent); }
.rd-tool:disabled { opacity: 0.35; cursor: default; }
.rd-strip-page { color: var(--reader-toolbar-fg); font-size: 0.72rem; font-variant-numeric: tabular-nums; text-align: center; }
.rd-swatch { width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--border-strong); cursor: pointer; padding: 0; }
.rd-swatch.on { border-color: var(--text-on-accent); box-shadow: 0 0 0 2px var(--accent); }
.rd-pencil.on { background: var(--gilt-soft); color: var(--gilt); border-color: var(--gilt); }
.rd-tap { position: absolute; top: 0; height: 100%; width: 18%; display: flex; align-items: center;
    z-index: 3; cursor: pointer; opacity: 0; transition: opacity 0.2s; color: var(--reader-toolbar-fg); font-size: 3rem; }
.rd-tap-left { left: 0; justify-content: flex-start; padding-left: 14px;
    background: linear-gradient(to right, var(--reader-tapzone), transparent); }
.rd-tap-right { right: 0; justify-content: flex-end; padding-right: 14px;
    background: linear-gradient(to left, var(--reader-tapzone), transparent); }
.rd-stage:hover .rd-tap { opacity: 0.5; }
.rd-tap:hover { opacity: 1 !important; }

.rd-toolbar {
    position: absolute; top: 0; left: 0; right: 0; z-index: 5;
    display: flex; align-items: center; gap: 12px; padding: 12px 16px;
    background: var(--reader-toolbar-bg); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    transform: translateY(-100%); transition: transform 0.25s ease; color: var(--reader-toolbar-fg);
}
#reader-root.chrome .rd-toolbar { transform: translateY(0); }
.rd-btn { border: 1px solid var(--border-strong); background: var(--accent-soft); color: var(--reader-toolbar-fg);
    padding: 7px 14px; border-radius: 20px; font-size: 0.9rem; font-weight: 600; cursor: pointer; transition: background 0.15s; }
.rd-btn:hover { background: var(--accent); color: var(--text-on-accent); }
.rd-zoom { display: flex; align-items: center; gap: 4px; }
.rd-zbtn { padding: 6px 10px; min-width: 34px; text-align: center; font-variant-numeric: tabular-nums; }
#rd-zoom-level { min-width: 52px; }
.rd-title { font-weight: 600; font-size: 0.98rem; max-width: 40vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rd-spacer { flex: 1; }
.rd-page { font-variant-numeric: tabular-nums; font-size: 0.92rem; color: var(--reader-index);
    background: var(--reader-tapzone); padding: 5px 12px; border-radius: 14px; }
.rd-hint { position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
    background: var(--reader-toolbar-bg); color: var(--reader-toolbar-fg); padding: 9px 18px; border-radius: 20px;
    font-size: 0.85rem; z-index: 6; opacity: 0; pointer-events: none; transition: opacity 0.4s; }
.rd-hint.show { opacity: 1; }

/* ── Visible keyboard focus on all interactive shell elements (accessibility) ── */
.tab:focus-visible, .btn-primary:focus-visible, .btn-ghost:focus-visible, .icon-btn:focus-visible,
.rd-btn:focus-visible, .lib-card-title:focus-visible, .lib-card-thumb:focus-visible {
    outline: 2px solid var(--focus-ring); outline-offset: 2px;
}

/* While the reader is open, keep the global gesture chrome coherent above it. */
body.reader-open #gesture-fab { display: none; }
body.reader-open #gesture-panel { z-index: 2200; }
body.reader-open #gesture-indicator { z-index: 2100; }
body.reader-open #gesture-toast { z-index: 2300; }
body.reader-open #gesture-edges { display: none; }

@media (max-width: 640px) {
    .appbar { gap: 8px; padding: 8px 12px; }
    .appbar-word { display: none; }
    .tab { padding: 7px 14px; font-size: 0.9rem; }
    .tab-sidecar { padding: 6px 11px; font-size: 0.8rem; }
    #view-library, #view-catalog { padding: 18px 14px 50px; }
    .lib-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
    .lib-head { flex-direction: column; align-items: flex-start; }
}

/* ── Layer 3: sign-in sheet (on-demand modal) + account chip ── */
#auth-sheet {
    position: fixed; inset: 0; z-index: 4000;
    display: flex; align-items: center; justify-content: center; padding: 24px;
    background: var(--scrim); backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px);
}
#auth-sheet.hidden { display: none; }
body.sheet-open { overflow: hidden; }
.auth-card {
    position: relative;
    width: 380px; max-width: 100%; padding: 30px 26px;
    background: var(--surface-raised); border: 1px solid var(--border); border-radius: 16px;
    box-shadow: var(--shadow-pop); color: var(--text);
}
#auth-close {
    position: absolute; top: 12px; right: 14px; border: none; background: none;
    font-size: 1.5rem; line-height: 1; color: var(--text-subtle); cursor: pointer;
}
#auth-close:hover { color: var(--text); }
.auth-brand { display: flex; align-items: center; gap: 10px; justify-content: center; margin-bottom: 6px; }
.auth-brand img { height: 34px; }
.auth-brand h1 { font-size: 1.5rem; color: var(--text-strong); }
.auth-tag { text-align: center; color: var(--text-muted); font-size: 0.9rem; margin-bottom: 20px; }
/* Google's "dark" button variant — keeps the app token-driven (the coloured G
   logo is a brand asset drawn inline in SVG). */
.auth-google {
    width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px;
    padding: 11px; border: 1px solid var(--border-strong); border-radius: 10px;
    background: var(--surface); color: var(--text); font-weight: 600; font-size: 0.92rem; cursor: pointer;
}
.auth-google:hover { background: var(--surface-raised); }
.auth-google:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }
.auth-or { display: flex; align-items: center; gap: 10px; margin: 16px 0; color: var(--text-subtle); font-size: 0.78rem; }
.auth-or::before, .auth-or::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.auth-tabs { display: flex; gap: 6px; background: var(--surface); border-radius: 10px; padding: 4px; margin-bottom: 18px; }
.auth-tab { flex: 1; padding: 8px; border: none; background: transparent; color: var(--text-muted);
    font-weight: 600; font-size: 0.9rem; border-radius: 7px; cursor: pointer; }
.auth-tab.active { background: var(--accent); color: var(--text-on-accent); }
#auth-form label { display: block; font-size: 0.8rem; color: var(--text-muted); font-weight: 600; margin-bottom: 14px; }
#auth-form input { width: 100%; margin-top: 5px; padding: 10px 12px; border: 1px solid var(--border);
    border-radius: 9px; font-size: 0.95rem; color: var(--text); background: var(--input-bg); }
#auth-form input:focus { outline: 2px solid var(--focus-ring); outline-offset: 1px; }
.auth-submit { width: 100%; margin-top: 4px; }
.auth-error { background: var(--danger-soft); color: var(--danger); border-radius: 8px;
    padding: 8px 10px; font-size: 0.82rem; margin-bottom: 12px; }
.auth-error.hidden { display: none; }
.auth-note { text-align: center; color: var(--text-subtle); font-size: 0.76rem; margin-top: 16px; line-height: 1.5; }
.auth-legal { text-align: center; color: var(--text-subtle); font-size: 0.74rem; margin-top: 10px; line-height: 1.5; }
.auth-legal a { color: var(--text-muted); text-decoration: underline; }
.auth-legal a:hover { color: var(--text); }

#account-chip { position: relative; margin-left: 10px; }
#account-signin { padding: 7px 15px; border-radius: 20px; border: 1px solid var(--border-strong);
    background: var(--accent-soft); color: var(--text); font-weight: 600; font-size: 0.86rem; cursor: pointer; }
#account-signin:hover { background: var(--accent); color: var(--text-on-accent); }
#account-signin.hidden, #account-btn.hidden { display: none; }
#account-btn { width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--border-strong);
    background: var(--accent-soft); color: var(--text-strong); font-weight: 700; cursor: pointer; }
#account-btn:hover { background: var(--accent); color: var(--text-on-accent); }
#account-menu { position: absolute; right: 0; top: 42px; min-width: 190px;
    background: var(--surface-raised); border: 1px solid var(--border); border-radius: 10px;
    box-shadow: var(--shadow-pop); padding: 10px; z-index: 600; }
#account-menu.hidden { display: none; }
.account-email { font-size: 0.82rem; color: var(--text-muted); padding: 4px 6px 10px; word-break: break-all;
    border-bottom: 1px solid var(--border); margin-bottom: 8px; }
#account-signout { width: 100%; padding: 8px; border: none; border-radius: 7px;
    background: var(--danger-soft); color: var(--danger); font-weight: 600; cursor: pointer; font-size: 0.85rem; }
#account-signout:hover { filter: brightness(1.1); }