/* ============================================================
   SHELFY · glass.css — shared glassmorphism system
   Tokens first; components derive from them.
   ============================================================ */

:root {
    --ink:        #eef0f6;
    --ink-dim:    rgba(238, 240, 246, 0.62);
    --glass-bg:   rgba(18, 22, 34, 0.42);
    --glass-brd:  rgba(255, 255, 255, 0.14);
    --glass-hi:   rgba(255, 255, 255, 0.06);
    --neon:       #6ef0d2;              /* active-element glow */
    --neon-soft:  rgba(110, 240, 210, 0.35);
    --danger:     #ff7d8a;
    --radius:     18px;
    --font-ui:    'Inter', system-ui, -apple-system, sans-serif;
    --font-serif: Georgia, 'Times New Roman', serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    min-height: 100%;
    color: var(--ink);
    font-family: var(--font-ui);
    background: #0b0e16;
}

/* ── Glass panel primitive ── */
.glass {
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(22px) saturate(1.3);
    backdrop-filter: blur(22px) saturate(1.3);
    border: 1px solid var(--glass-brd);
    border-radius: var(--radius);
    box-shadow:
        inset 0 1px 0 var(--glass-hi),
        0 18px 50px rgba(0, 0, 0, 0.45);
}

/* ── Buttons ── */
.btn {
    font: 600 0.85rem/1 var(--font-ui);
    letter-spacing: 0.03em;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--glass-brd);
    border-radius: 12px;
    padding: 0.65rem 1.1rem;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}
.btn:hover  { background: rgba(255, 255, 255, 0.12); }
.btn:focus-visible { outline: 2px solid var(--neon); outline-offset: 2px; }
.btn.active,
.btn[aria-pressed="true"] {
    border-color: var(--neon);
    box-shadow: 0 0 14px var(--neon-soft), inset 0 0 8px rgba(110, 240, 210, 0.12);
    color: var(--neon);
}
.btn.danger { border-color: var(--danger); color: var(--danger); }

/* ── Inputs ── */
.field {
    width: 100%;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-brd);
    border-radius: 12px;
    padding: 0.7rem 0.9rem;
    font: 400 0.9rem var(--font-ui);
}
.field:focus { outline: none; border-color: var(--neon); box-shadow: 0 0 0 3px var(--neon-soft); }

/* ── Book metadata panel (slides in when a book is focused) ── */
.book-panel {
    position: fixed;
    top: 50%; right: clamp(12px, 4vw, 48px);
    transform: translateY(-50%) translateX(24px);
    width: min(340px, calc(100vw - 24px));
    padding: 1.5rem 1.6rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.45s ease, transform 0.45s ease;
    z-index: 30;
}
.book-panel.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(-50%) translateX(0);
}
.book-panel h2 { font: 700 1.3rem/1.25 var(--font-serif); margin: 0 0 0.2rem; }
.book-panel .author { color: var(--ink-dim); margin: 0 0 1.1rem; font-size: 0.9rem; }
.book-panel dl { display: grid; grid-template-columns: auto 1fr; gap: 0.35rem 0.9rem; margin: 0; font-size: 0.85rem; }
.book-panel dt { color: var(--ink-dim); }
.book-panel dd { margin: 0; }

/* Reading progress bar */
.progress {
    height: 6px; border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    overflow: hidden; margin: 1rem 0 0.35rem;
}
.progress > span {
    display: block; height: 100%;
    background: linear-gradient(90deg, var(--neon), #7aa8ff);
    box-shadow: 0 0 10px var(--neon-soft);
    border-radius: 3px;
    transition: width 0.6s ease;
}

/* Status chips */
.chip {
    display: inline-block;
    font: 600 0.7rem/1 var(--font-ui);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.3rem 0.6rem;
    border-radius: 999px;
    border: 1px solid var(--glass-brd);
    color: var(--ink-dim);
}
.chip.lent { border-color: var(--danger); color: var(--danger); }
.chip.reading { border-color: var(--neon); color: var(--neon); }

/* ── HUD toolbar (demo & dashboard) ── */
.hud {
    position: fixed;
    left: 50%; bottom: clamp(12px, 3vh, 28px);
    transform: translateX(-50%);
    display: flex; flex-wrap: wrap; gap: 0.5rem;
    padding: 0.7rem 0.9rem;
    z-index: 20;
    max-width: calc(100vw - 24px);
    justify-content: center;
}
.hud .group { display: flex; gap: 0.4rem; align-items: center; }
.hud .label { font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-dim); margin-right: 0.2rem; }

/* ── 3D stage ── */
.stage-wrap { position: fixed; inset: 0; }
.stage-wrap canvas { width: 100%; height: 100%; display: block; }

@media (prefers-reduced-motion: reduce) {
    * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}