/* ── Library chat widget — "Lumina Concierge" ──────────────────────
   Plain CSS translation of the owner-provided Tailwind design
   (code.html) using the palette from DESIGN.md. No Tailwind CDN. */

:root {
    --lc-background: #f7f9fb;
    --lc-surface: #f7f9fb;
    --lc-surface-dim: #d8dadc;
    --lc-surface-container-lowest: #ffffff;
    --lc-surface-container-low: #f2f4f6;
    --lc-surface-container: #eceef0;
    --lc-surface-container-high: #e6e8ea;
    --lc-surface-container-highest: #e0e3e5;
    --lc-surface-variant: #e0e3e5;
    --lc-on-surface: #191c1e;
    --lc-on-surface-variant: #434751;
    --lc-outline: #737783;
    --lc-outline-variant: #c3c6d3;
    --lc-primary: #2959ac;
    --lc-on-primary: #ffffff;
    --lc-primary-container: #4673c7;
    --lc-on-primary-container: #fefcff;
    --lc-primary-fixed-dim: #aec6ff;
    --lc-secondary: #8f4e00;
    --lc-secondary-fixed: #ffdcc2;
    --lc-on-secondary-fixed: #2e1500;
    --lc-tertiary: #006859;
    --lc-error: #ba1a1a;
    --lc-error-container: #ffdad6;

    --lc-font: "Hanken Grotesk", "Source Sans 3", -apple-system, sans-serif;
    --lc-shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.08);
}

/* ── floating launcher ────────────────────────────────────────────── */
.launcher {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 9900;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px 10px 12px;
    background: var(--lc-primary);
    color: var(--lc-on-primary);
    border: none;
    border-radius: 999px;
    font-family: var(--lc-font);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    box-shadow: var(--lc-shadow-soft);
    transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.launcher:hover {
    background: var(--lc-primary-container);
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(41, 89, 172, 0.22);
}
.launcher:focus-visible { outline: 2px solid var(--lc-primary-fixed-dim); outline-offset: 2px; }
.launcher-icon { font-size: 20px; }
.launcher.hidden { display: none; }

.badge {
    position: absolute;
    top: -4px;
    right: -4px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: 999px;
    background: var(--lc-error);
    color: #ffffff;
    font-size: 11px;
    font-weight: 700;
    line-height: 18px;
    text-align: center;
    box-shadow: 0 2px 6px rgba(186, 26, 26, 0.4);
}

/* ── panel ────────────────────────────────────────────────────────── */
.widget {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 9901;
    width: 360px;
    max-width: calc(100vw - 40px);
    height: 520px;
    max-height: calc(100vh - 48px);
    background: var(--lc-surface-container-lowest);
    border-radius: 16px;
    border: 1px solid rgba(195, 198, 211, 0.3);
    box-shadow: var(--lc-shadow-soft);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    opacity: 0;
    transform: translateY(12px) scale(0.98);
    pointer-events: none;
    transition: opacity 0.22s ease, transform 0.22s ease;
}
.widget.open { opacity: 1; transform: none; pointer-events: auto; }

/* ── header (glassmorphism) ───────────────────────────────────────── */
.widget-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(247, 249, 251, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(195, 198, 211, 0.3);
    border-radius: 16px 16px 0 0;
    flex-shrink: 0;
}
.widget-head-id { display: flex; align-items: center; gap: 12px; min-width: 0; }
.avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    flex-shrink: 0;
}
.avatar-sm {
    width: 32px;
    height: 32px;
    background: var(--lc-primary-container);
    color: var(--lc-on-primary-container);
}
.avatar-sm .material-symbols-outlined { font-size: 18px; }
.avatar-bot {
    width: 28px;
    height: 28px;
    background: var(--lc-primary-container);
    color: var(--lc-on-primary-container);
}
.avatar-bot .material-symbols-outlined { font-size: 16px; }
.headline-sm {
    margin: 0;
    font-family: var(--lc-font);
    font-size: 16px;
    font-weight: 600;
    line-height: 24px;
    color: var(--lc-on-surface);
}
.head-sub {
    margin: 0;
    font-size: 11px;
    font-weight: 500;
    line-height: 14px;
    color: var(--lc-primary);
}
.head-actions { display: flex; align-items: center; gap: 2px; flex-shrink: 0; }
.icon-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--lc-on-surface-variant);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}
.icon-btn:hover { background: rgba(224, 227, 229, 0.5); color: var(--lc-on-surface); }
.icon-btn .material-symbols-outlined { font-size: 20px; }

/* ── thread ───────────────────────────────────────────────────────── */
.thread {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 16px;
    background: var(--lc-surface);
    display: flex;
    flex-direction: column;
    gap: 12px;
    scrollbar-width: thin;
    scrollbar-color: var(--lc-outline-variant) transparent;
}
.thread::-webkit-scrollbar { width: 6px; }
.thread::-webkit-scrollbar-thumb { background: var(--lc-outline-variant); border-radius: 99px; }

.msg { display: flex; flex-direction: column; max-width: 85%; min-width: 0; }
.msg.bot { align-self: flex-start; align-items: flex-start; width: 100%; max-width: 100%; }
.msg.user { align-self: flex-end; align-items: flex-end; }
.msg-row { display: flex; align-items: flex-end; gap: 8px; width: 100%; min-width: 0; }

/* ── bubbles ──────────────────────────────────────────────────────── */
.bubble {
    position: relative;
    padding: 12px 16px;
    font-family: var(--lc-font);
    font-size: 14px;
    font-weight: 400;
    line-height: 20px;
    border-radius: 16px;
    word-break: break-word;
    min-width: 0;
    max-width: 100%;
}
.msg.bot .bubble {
    background: var(--lc-surface-container-lowest);
    border: 1px solid rgba(195, 198, 211, 0.3);
    border-bottom-left-radius: 4px;
    color: var(--lc-on-surface);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.msg.user .bubble {
    background: var(--lc-secondary-fixed);
    color: var(--lc-on-secondary-fixed);
    border-bottom-right-radius: 4px;
}
.bubble.streaming::after {
    content: '▍';
    margin-left: 2px;
    color: var(--lc-primary);
    animation: lc-blink 1s steps(1) infinite;
}
@keyframes lc-blink { 50% { opacity: 0; } }

/* markdown content */
.bubble strong { font-weight: 600; }
.bubble em { font-style: italic; }
.bubble del { color: var(--lc-outline); }
.bubble a { color: var(--lc-primary); text-decoration: underline; }
.bubble a:hover { color: var(--lc-primary-container); }
.bubble code {
    font-family: ui-monospace, SFMono-Regular, "Cascadia Mono", Consolas, monospace;
    font-size: 0.85em;
    background: var(--lc-surface-container);
    color: var(--lc-on-surface-variant);
    padding: 1px 5px;
    border-radius: 5px;
}
.bubble pre {
    margin: 8px 0 2px;
    padding: 10px 12px;
    background: var(--lc-on-surface);
    color: var(--lc-surface);
    border-radius: 8px;
    overflow-x: auto;
    font-size: 12px;
    line-height: 1.5;
}
.bubble pre code { background: transparent; color: inherit; padding: 0; }
.bubble h1, .bubble h2, .bubble h3, .bubble h4, .bubble h5, .bubble h6 {
    margin: 10px 0 4px;
    font-family: var(--lc-font);
    font-weight: 700;
    color: var(--lc-on-surface);
    line-height: 1.3;
}
.bubble h1 { font-size: 17px; }
.bubble h2 { font-size: 16px; }
.bubble h3 { font-size: 15px; }
.bubble h4, .bubble h5, .bubble h6 { font-size: 14px; }
.bubble p { margin: 6px 0; }
.bubble p:first-child { margin-top: 0; }
.bubble p:last-child { margin-bottom: 0; }
.bubble ul, .bubble ol { margin: 6px 0 2px; padding-left: 18px; }
.bubble li { margin-bottom: 2px; }
.bubble blockquote {
    margin: 8px 0 2px;
    padding: 2px 12px;
    border-left: 3px solid var(--lc-primary);
    color: var(--lc-on-surface-variant);
}
.bubble hr { border: none; border-top: 1px solid var(--lc-outline-variant); margin: 10px 0; }

/* tables — horizontally scrollable, never vertically squashed */
.table-wrap {
    overflow-x: auto;
    margin: 8px 0 2px;
    -webkit-overflow-scrolling: touch;
    border-radius: 8px;
    border: 1px solid var(--lc-outline-variant);
    background: var(--lc-surface-container-lowest);
    max-width: 100%;
}
.bubble table {
    border-collapse: collapse;
    min-width: 100%;
    font-size: 13px;
    line-height: 1.45;
    white-space: nowrap;
}
.bubble th, .bubble td {
    border: 1px solid var(--lc-outline-variant);
    padding: 5px 10px;
    text-align: left;
    vertical-align: top;
    white-space: nowrap;
}
.bubble th {
    background: var(--lc-surface-container-low);
    color: var(--lc-on-surface);
    font-weight: 600;
}
.bubble tr:nth-child(even) td { background: var(--lc-surface-container-low); }

.timestamp {
    margin-top: 4px;
    font-family: var(--lc-font);
    font-size: 11px;
    font-weight: 500;
    line-height: 14px;
    color: var(--lc-outline);
}

/* typing indicator */
.typing-row { display: flex; align-items: center; gap: 8px; opacity: 0.55; }
.typing-label {
    font-family: var(--lc-font);
    font-size: 11px;
    font-weight: 500;
    color: var(--lc-outline);
}

/* ── composer ─────────────────────────────────────────────────────── */
.composer {
    flex-shrink: 0;
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 12px;
    background: var(--lc-surface-container-low);
    border-top: 1px solid rgba(195, 198, 211, 0.2);
}
.input-wrap {
    flex: 1;
    background: var(--lc-surface-container-lowest);
    border: 1px solid rgba(195, 198, 211, 0.3);
    border-radius: 12px;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04);
    padding: 8px 12px;
    min-height: 44px;
    display: flex;
    align-items: center;
}
.input-wrap textarea {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    resize: none;
    font-family: var(--lc-font);
    font-size: 14px;
    line-height: 20px;
    color: var(--lc-on-surface);
    max-height: 80px;
    padding: 0;
    box-shadow: none;
}
.input-wrap textarea::placeholder { color: rgba(67, 71, 81, 0.6); }
.send-btn {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    border: none;
    border-radius: 50%;
    background: var(--lc-primary);
    color: var(--lc-on-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
    transition: background 0.15s ease, transform 0.15s ease;
}
.send-btn:hover { background: var(--lc-surface-tint, var(--lc-primary-container)); }
.send-btn:active { transform: scale(0.92); }
.send-btn:disabled { opacity: 0.55; cursor: not-allowed; }
.send-btn .material-symbols-outlined { font-size: 20px; }

/* ── session list overlay ─────────────────────────────────────────── */
.session-list {
    position: absolute;
    inset: 0;
    z-index: 3;
    background: var(--lc-surface-container-lowest);
    display: flex;
    flex-direction: column;
}
.session-list[hidden] { display: none; }
.session-list-head {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--lc-outline-variant);
    font-family: var(--lc-font);
    font-size: 14px;
    font-weight: 600;
    color: var(--lc-on-surface);
}
.back-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--lc-on-surface-variant);
    cursor: pointer;
    transition: background 0.15s ease;
}
.back-btn:hover { background: var(--lc-surface-variant); }
.back-btn .material-symbols-outlined { font-size: 20px; }
.session-list-body {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.session-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 4px;
    border: 1px solid transparent;
    background: transparent;
    border-radius: 8px;
    padding: 4px;
    font-family: var(--lc-font);
    transition: background 0.15s ease, border-color 0.15s ease;
}
.session-item:hover { background: var(--lc-surface-container-low); border-color: var(--lc-outline-variant); }
.session-item.current { background: var(--lc-surface-container-low); border-color: var(--lc-primary); }
.session-main {
    flex: 1;
    min-width: 0;
    text-align: left;
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 6px 8px;
    font-family: var(--lc-font);
}
.session-del {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--lc-outline);
    cursor: pointer;
    opacity: 0;
    transition: background 0.15s ease, color 0.15s ease, opacity 0.15s ease;
}
.session-item:hover .session-del { opacity: 1; }
.session-del:hover { background: var(--lc-error-container); color: var(--lc-error); }
.session-del:disabled { opacity: 0.4; cursor: default; }
.session-del .material-symbols-outlined { font-size: 20px; }
.session-item .session-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--lc-on-surface);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.session-item .session-meta { font-size: 11px; color: var(--lc-outline); }
.session-empty {
    text-align: center;
    color: var(--lc-outline);
    font-size: 13px;
    padding: 30px 16px;
}

/* ── responsive + reduced motion ──────────────────────────────────── */
@media (max-width: 480px) {
    .widget, .launcher { right: 16px; bottom: 16px; }
    .widget { width: 100%; max-width: calc(100vw - 32px); }
}
@media (hover: none) {
    .session-del { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
    .widget, .launcher, .send-btn, .icon-btn { transition: none; }
}