:root, [data-theme="light"] {
    --bg: #f6f7f9;
    --sidebar-bg: #0f1a3f;
    --sidebar-bg-hover: #1a2a5e;
    --sidebar-text: #e7eaf3;
    --sidebar-text-soft: #b0b7ce;
    --sidebar-active: #1fa9e8;
    --surface: #ffffff;
    --surface-soft: #f1f3f7;
    --border: #e3e6eb;
    --text: #1a1f2b;
    --text-soft: #5a6478;
    --primary: #0f1a3f;
    --primary-hover: #1a2a5e;
    --accent: #1fa9e8;
    --accent-soft: rgba(31, 169, 232, .12);
    --danger: #d81b60;
    --danger-bg: #fde8ed;
    --danger-border: #f5c6d2;
    --success: #0f7b3a;
    --success-bg: #e8f7ee;
    --user-bubble: #1fa9e8;
    --user-text: #ffffff;
    --assistant-bubble: #ffffff;
    --code-bg: #f1f3f7;
    --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 4px 12px rgba(15, 23, 42, .04);
    --sidebar-width: 280px;
}

[data-theme="dark"] {
    --bg: #0d1117;
    --sidebar-bg: #050811;
    --sidebar-bg-hover: #1a2a5e;
    --sidebar-text: #e7eaf3;
    --sidebar-text-soft: #8d96b0;
    --sidebar-active: #1fa9e8;
    --surface: #161b22;
    --surface-soft: #1c222b;
    --border: #2a3140;
    --text: #e7eaf3;
    --text-soft: #8d96b0;
    --primary: #1fa9e8;
    --primary-hover: #38b8ee;
    --accent: #1fa9e8;
    --accent-soft: rgba(31, 169, 232, .18);
    --danger: #f06292;
    --danger-bg: rgba(216, 27, 96, .15);
    --danger-border: rgba(216, 27, 96, .35);
    --success: #4ade80;
    --success-bg: rgba(74, 222, 128, .12);
    --user-bubble: #1fa9e8;
    --user-text: #0d1117;
    --assistant-bubble: #161b22;
    --code-bg: #1c222b;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 12px rgba(0, 0, 0, .25);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
}

.app-shell {
    display: flex;
    height: 100%;
    overflow: hidden;
}

/* --- Sidebar --- */

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    border-right: 1px solid rgba(255,255,255,.06);
    transition: transform .25s ease;
}

.sidebar-header {
    padding: 16px 16px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}

.sidebar .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    overflow: hidden;
}

.sidebar .brand-logo {
    /* El logo Nolan tiene letras blancas como parte del diseño; el fondo
       oscuro del sidebar las hace visibles. NO envolver en un fondo
       blanco porque oculta esas letras. */
    height: 38px;
    width: auto;
    flex-shrink: 0;
}

.sidebar .brand-text {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar .brand h1 {
    font-size: 14px;
    font-weight: 600;
    line-height: 1.2;
    color: var(--sidebar-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar .subtitle {
    font-size: 11px;
    color: var(--sidebar-text-soft);
    line-height: 1.2;
    margin-top: 2px;
}

.sidebar-close {
    display: none;
    background: transparent;
    border: none;
    color: var(--sidebar-text);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
}

.sidebar-close:hover { background: rgba(255,255,255,.08); }

.new-session-btn {
    margin: 12px;
    padding: 10px 12px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: background .15s;
}

.new-session-btn:hover:not(:disabled) {
    background: #0f8fc6;
}

.new-session-btn:disabled {
    background: rgba(255,255,255,.1);
    color: var(--sidebar-text-soft);
    cursor: not-allowed;
}

.sessions-list {
    flex: 1;
    overflow-y: auto;
    padding: 4px 8px 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.session-item {
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--sidebar-text);
    transition: background .12s;
    position: relative;
}

.session-item:hover {
    background: rgba(255,255,255,.06);
}

.session-item.active {
    background: rgba(31,169,232,.18);
    border-left: 3px solid var(--sidebar-active);
    padding-left: 9px;
}

.session-item .title {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.session-item .title.untitled {
    color: var(--sidebar-text-soft);
    font-style: italic;
}

.session-item .delete-btn {
    opacity: 0;
    background: transparent;
    border: none;
    color: var(--sidebar-text-soft);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    transition: opacity .12s, background .12s, color .12s;
}

.session-item:hover .delete-btn,
.session-item.active .delete-btn {
    opacity: .7;
}

.session-item .delete-btn:hover {
    opacity: 1;
    background: rgba(216,27,96,.2);
    color: #ff7ba6;
}

.sessions-empty {
    padding: 20px 16px;
    color: var(--sidebar-text-soft);
    font-size: 12px;
    text-align: center;
    font-style: italic;
}

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid rgba(255,255,255,.08);
    font-size: 12px;
    color: var(--sidebar-text-soft);
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.user-info {
    flex: 1;
    overflow: hidden;
}

.user-info .name {
    color: var(--sidebar-text);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-info .role {
    font-size: 11px;
    color: var(--sidebar-text-soft);
    text-transform: uppercase;
    letter-spacing: .5px;
}

/* --- Main area --- */

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}

.topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.sidebar-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--text);
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
}

.sidebar-toggle:hover { background: var(--surface-soft); }

.topbar-title {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.status {
    font-size: 12px;
    color: var(--text-soft);
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--surface-soft);
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.status.ok {
    color: var(--success);
    background: var(--success-bg);
    border-color: #cae8d4;
}

.status.error {
    color: var(--danger);
    background: var(--danger-bg);
    border-color: var(--danger-border);
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 920px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
    overflow: hidden;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px 0;
    display: flex;
    flex-direction: column;
    gap: 18px;
    scroll-behavior: smooth;
}

.message {
    display: flex;
    width: 100%;
}

.message.user {
    justify-content: flex-end;
}

.message.assistant {
    justify-content: flex-start;
}

.message-column {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-width: 82%;
}

.message.user .message-column {
    align-items: flex-end;
}

.message.assistant .message-column {
    align-items: flex-start;
}

.bubble {
    padding: 12px 16px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    font-size: 14.5px;
    word-wrap: break-word;
}

.message.user .bubble {
    background: var(--user-bubble);
    color: var(--user-text);
    border-bottom-right-radius: 4px;
}

.message.assistant .bubble {
    background: var(--assistant-bubble);
    color: var(--text);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}

.bubble p + p,
.bubble p + ul,
.bubble p + ol,
.bubble ul + p,
.bubble ol + p {
    margin-top: 10px;
}

.bubble ul,
.bubble ol {
    padding-left: 22px;
}

.bubble ol li,
.bubble ul li {
    margin: 4px 0;
}

.bubble strong { font-weight: 600; }

.bubble code {
    background: var(--code-bg);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 0.92em;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.message.user .bubble code {
    background: rgba(255, 255, 255, .2);
}

.sources {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
    font-size: 12px;
    color: var(--text-soft);
}

.sources strong {
    color: var(--text);
    font-weight: 600;
}

.sources ul {
    list-style: none;
    padding: 0;
    margin-top: 6px;
}

.sources li {
    padding: 2px 0;
    margin: 0;
}

/* --- Feedback --- */

.feedback-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 4px 0;
    font-size: 12px;
    color: var(--text-soft);
}

.feedback-bar .fb-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-soft);
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: background .12s, border-color .12s, color .12s;
    font-family: inherit;
}

.feedback-bar .fb-btn:hover:not(:disabled) {
    background: var(--surface);
    border-color: #b5b9c3;
    color: var(--text);
}

.feedback-bar .fb-btn:disabled {
    opacity: .5;
    cursor: not-allowed;
}

.feedback-bar .fb-btn.selected.up {
    background: var(--success-bg);
    border-color: #9ed6b1;
    color: var(--success);
}

.feedback-bar .fb-btn.selected.down {
    background: var(--danger-bg);
    border-color: var(--danger-border);
    color: var(--danger);
}

.feedback-bar .fb-hint {
    font-size: 11px;
    color: var(--text-soft);
    font-style: italic;
    margin-left: 4px;
}

/* feedback-bar-wrap es el padre directo de feedback-bar y feedback-comment.
   Sin width:100% se colapsaba al tamaño de los botones 👍/👎 y la caja de
   comentario heredaba ese ancho. Forzamos que ocupe todo el ancho del
   .message-column para que la caja de feedback quede al ancho del bubble. */
.feedback-bar-wrap {
    width: 100%;
    display: flex;
    flex-direction: column;
}

.feedback-comment {
    margin-top: 6px;
    background: var(--surface);
    border: 1px solid var(--danger-border);
    border-radius: 10px;
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    box-shadow: var(--shadow);
}

.feedback-comment textarea {
    border: none;
    background: transparent;
    resize: vertical;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text);
    outline: none;
    min-height: 80px;
    width: 100%;
}

.feedback-comment-actions {
    display: flex;
    justify-content: flex-end;
    gap: 6px;
}

.feedback-comment-actions button {
    padding: 5px 10px;
    font-size: 12px;
    font-weight: 500;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    cursor: pointer;
    font-family: inherit;
    transition: background .12s;
}

.feedback-comment-actions button:hover { background: var(--surface-soft); }

.feedback-comment-actions button.primary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.feedback-comment-actions button.primary:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
}

.feedback-saved-note {
    font-size: 11px;
    color: var(--success);
    margin-top: 4px;
    font-style: italic;
}

/* --- Intro (mensaje de bienvenida cuando no hay turnos) --- */

.intro .bubble {
    background: linear-gradient(135deg, #ffffff 0%, #fcfcfd 100%);
}

.typing {
    display: inline-flex;
    gap: 4px;
    padding: 6px 0;
}

.typing span {
    width: 7px;
    height: 7px;
    background: var(--text-soft);
    border-radius: 50%;
    animation: bounce 1.2s infinite ease-in-out;
}

.typing span:nth-child(2) { animation-delay: .15s; }
.typing span:nth-child(3) { animation-delay: .3s; }

@keyframes bounce {
    0%, 80%, 100% { transform: translateY(0); opacity: .4; }
    40% { transform: translateY(-6px); opacity: 1; }
}

.composer {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    padding: 14px 0 24px;
    border-top: 1px solid var(--border);
    background: var(--bg);
    flex-shrink: 0;
}

.composer textarea {
    flex: 1;
    resize: none;
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 12px 16px;
    font-family: inherit;
    font-size: 14.5px;
    background: var(--surface);
    color: var(--text);
    line-height: 1.5;
    max-height: 160px;
    box-shadow: var(--shadow);
    transition: border-color .15s, box-shadow .15s;
}

.composer textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.composer button {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    border: none;
    background: var(--primary);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .15s, transform .1s;
    flex-shrink: 0;
    box-shadow: var(--shadow);
}

.composer button:hover:not(:disabled) { background: var(--primary-hover); }
.composer button:active:not(:disabled) { transform: scale(.96); }

.composer button:disabled {
    background: var(--text-soft);
    opacity: .5;
    cursor: not-allowed;
}

/* --- Theme toggle --- */
.theme-toggle {
    background: transparent;
    border: 1px solid rgba(255,255,255,.12);
    color: var(--sidebar-text);
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 8px;
    font-size: 12px;
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background .12s, border-color .12s;
}
.theme-toggle:hover {
    background: rgba(255,255,255,.08);
    border-color: rgba(255,255,255,.22);
}
.theme-toggle .icon { font-size: 14px; line-height: 1; }

/* --- Toasts (reemplazo de alert()) --- */
.toast-container {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: 360px;
    pointer-events: none;
}

.toast {
    pointer-events: auto;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: 10px;
    padding: 12px 14px;
    box-shadow: var(--shadow);
    font-size: 13px;
    line-height: 1.45;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    animation: toast-in .25s ease;
}
.toast.error { border-left-color: var(--danger); }
.toast.success { border-left-color: var(--success); }
.toast .toast-text { flex: 1; }
.toast .toast-close {
    background: transparent;
    border: none;
    color: var(--text-soft);
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    padding: 0;
}
.toast .toast-close:hover { color: var(--text); }
@keyframes toast-in {
    from { opacity: 0; transform: translateX(20px); }
    to   { opacity: 1; transform: translateX(0); }
}
@keyframes toast-out {
    from { opacity: 1; transform: translateX(0); }
    to   { opacity: 0; transform: translateX(20px); }
}
.toast.leaving { animation: toast-out .2s ease forwards; }

/* --- Keyboard shortcut hint --- */
.kbd {
    display: inline-block;
    padding: 1px 6px;
    border-radius: 4px;
    background: var(--surface-soft);
    border: 1px solid var(--border);
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 11px;
    color: var(--text-soft);
}
.sidebar .kbd {
    background: rgba(255,255,255,.08);
    border-color: rgba(255,255,255,.14);
    color: var(--sidebar-text-soft);
}

/* --- Empty state mejorada --- */
.empty-state {
    padding: 40px 24px;
    text-align: center;
    color: var(--text-soft);
    font-size: 14px;
}
.empty-state .icon-big { font-size: 44px; opacity: .6; margin-bottom: 12px; }

/* --- Admin banner (existente, sin cambios funcionales) --- */

.admin-banner {
    margin: 16px 0 0;
    padding: 16px 18px;
    border-radius: 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    flex-shrink: 0;
}

.admin-banner[hidden] { display: none; }
.admin-banner.detect { border-left: 4px solid var(--primary); }
.admin-banner.processing {
    border-left: 4px solid #f0a020;
    background: linear-gradient(180deg, #fffaf0 0%, #ffffff 100%);
}
.admin-banner.indexing {
    border-left: 4px solid var(--accent);
    background: linear-gradient(180deg, #f0f7ff 0%, #ffffff 100%);
}
.admin-banner.done {
    border-left: 4px solid var(--success);
    background: linear-gradient(180deg, #f0fdf4 0%, #ffffff 100%);
}
.admin-banner.error {
    border-left: 4px solid var(--danger);
    background: linear-gradient(180deg, #fef2f2 0%, #ffffff 100%);
}

.banner-header {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14.5px;
    font-weight: 600;
    color: var(--text);
}

.banner-header .icon { font-size: 18px; line-height: 1; }

.banner-body {
    margin-top: 10px;
    font-size: 13.5px;
    color: var(--text-soft);
    line-height: 1.55;
}

.banner-body ul { margin: 8px 0 0; padding: 0; list-style: none; }

.banner-body li {
    padding: 6px 0;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.banner-body li:first-child { border-top: none; padding-top: 4px; }

.banner-body .pdf-name {
    color: var(--text);
    font-weight: 500;
    font-size: 13px;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.banner-body .pdf-meta {
    font-size: 12px;
    color: var(--text-soft);
    white-space: nowrap;
}

.banner-body .pdf-progress-row {
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: stretch;
    padding: 8px 0;
    border-top: 1px solid var(--border);
}

.banner-body .pdf-progress-row:first-child {
    border-top: none;
    padding-top: 4px;
}

.banner-body .pdf-progress-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-size: 13px;
}

.progress-bar {
    height: 6px;
    background: var(--border);
    border-radius: 999px;
    overflow: hidden;
}

.progress-bar .fill {
    height: 100%;
    background: var(--user-bubble);
    border-radius: 999px;
    transition: width .3s ease;
}

.progress-bar .fill.warn { background: #f0a020; }
.progress-bar .fill.success { background: var(--success); }
.progress-bar .fill.error { background: var(--danger); }

.banner-actions {
    margin-top: 14px;
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

.banner-actions button {
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    padding: 8px 14px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background .15s, border-color .15s;
}

.banner-actions button:hover:not(:disabled) {
    background: var(--surface-soft);
    border-color: #c6cad4;
}

.banner-actions button.primary {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.banner-actions button.primary:hover:not(:disabled) {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
}

.banner-actions button:disabled { opacity: .5; cursor: not-allowed; }

.banner-status-pill {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--surface-soft);
    color: var(--text-soft);
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: .3px;
    margin-left: 8px;
}

.banner-status-pill.extracting { background: #fff3d9; color: #8a5800; }
.banner-status-pill.done { background: var(--success-bg); color: var(--success); }
.banner-status-pill.error { background: var(--danger-bg); color: var(--danger); }

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.4);
    z-index: 40;
}

.sidebar-overlay.active { display: block; }

/* --- Mobile --- */

@media (max-width: 840px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        z-index: 50;
        transform: translateX(-100%);
        box-shadow: 0 0 24px rgba(0,0,0,.2);
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-close { display: flex; }
    .sidebar-toggle { display: flex; }
    .chat-container { padding: 0 16px; }
    .bubble { font-size: 14px; }
    .message-column { max-width: 90%; }
}