:root {
    --bg: #f5efe4;
    --panel: rgba(255, 252, 247, 0.82);
    --text: #1d1b19;
    --muted: #5a534c;
    --border: rgba(29, 27, 25, 0.12);
    --card-border: rgba(125, 49, 23, 0.14);
    --accent: #b14d2a;
    --accent-dark: #7d3117;
    --success: #edf7ed;
    --success-border: rgba(76, 140, 76, 0.25);
    --error: #fdeceb;
    --error-border: rgba(180, 73, 73, 0.25);
    --shadow: 0 12px 32px rgba(62, 44, 28, 0.10);
    --shadow-sm: 0 4px 12px rgba(62, 44, 28, 0.07);
    --transition: 0.2s ease;
    --sidebar-w: 320px;
    --topbar-h: 56px;
}

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

body {
    font-family: Georgia, "Times New Roman", serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(177, 77, 42, 0.14), transparent 30%),
        linear-gradient(180deg, #f7f1e7 0%, #efe4d3 100%);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ── Top Bar ── */

.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--topbar-h);
    display: flex;
    align-items: center;
    padding: 0 24px;
    background: rgba(247, 241, 231, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.topbar__brand {
    display: flex;
    align-items: baseline;
    gap: 12px;
}

.topbar__title {
    font-size: 1.35rem;
    line-height: 1;
}

.topbar__badge {
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.68rem;
    color: var(--accent-dark);
    background: rgba(177, 77, 42, 0.1);
    padding: 3px 8px;
    border-radius: 999px;
    font-weight: 700;
}

/* ── Layout ── */

.layout {
    display: grid;
    grid-template-columns: var(--sidebar-w) 1fr;
    min-height: 100vh;
    padding-top: var(--topbar-h);
}

/* ── Sidebar ── */

.sidebar {
    position: sticky;
    top: var(--topbar-h);
    height: calc(100vh - var(--topbar-h));
    overflow-y: auto;
    padding: 20px 16px;
    border-right: 1px solid var(--border);
    background: rgba(250, 245, 238, 0.6);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar__section {
    padding: 16px;
    border-radius: 16px;
    background: var(--panel);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.sidebar__section + .sidebar__section {
    margin-top: 4px;
}

.sidebar__heading {
    font-size: 1rem;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar__desc {
    color: var(--muted);
    font-size: 0.85rem;
    line-height: 1.45;
    margin-bottom: 14px;
}

/* Upload group */

.source-upload-group {
    display: grid;
    gap: 10px;
}

.action-stack {
    display: grid;
    gap: 8px;
}

.upload-dropzone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 18px 12px;
    border: 2px dashed var(--card-border);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition);
    text-align: center;
}

.upload-dropzone:hover {
    border-color: var(--accent);
    background: rgba(255, 246, 235, 0.6);
}

.upload-dropzone__icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(177, 77, 42, 0.1);
    color: var(--accent);
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1;
}

.upload-dropzone__text {
    font-size: 0.85rem;
    color: var(--muted);
    font-weight: 600;
}

.upload-form__filename {
    font-size: 0.82rem;
    color: var(--accent-dark);
    font-weight: 600;
    min-height: 1em;
    text-align: center;
    word-break: break-all;
}

.upload-form__filename:empty {
    display: none;
}

.divider-or {
    text-align: center;
    font-size: 0.78rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    position: relative;
}

.divider-or span {
    background: var(--panel);
    padding: 0 10px;
    position: relative;
    z-index: 1;
}

.divider-or::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border);
}

.url-form {
    display: grid;
    gap: 8px;
}

.input--compact {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 12px;
    font: inherit;
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.74);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.input--compact:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(177, 77, 42, 0.1);
}

.input--compact::placeholder {
    color: #9e9387;
}

/* Document list */

.doc-list {
    display: grid;
    gap: 6px;
}

.doc-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid transparent;
    transition: background var(--transition), border-color var(--transition);
}

.doc-item:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--card-border);
}

.doc-item__icon {
    color: var(--accent);
    display: flex;
}

.doc-item__info {
    min-width: 0;
}

.doc-item__name {
    font-size: 0.88rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.doc-item__meta {
    font-size: 0.75rem;
    color: var(--muted);
    margin-top: 2px;
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    padding: 0;
    transition: background var(--transition), color var(--transition);
}

.btn-icon--danger:hover {
    background: rgba(180, 73, 73, 0.12);
    color: #b44949;
}

.count-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    border-radius: 999px;
    background: rgba(177, 77, 42, 0.12);
    color: var(--accent-dark);
    font-size: 0.75rem;
    font-weight: 700;
}

.empty-state {
    color: var(--muted);
    font-size: 0.85rem;
    font-style: italic;
    text-align: center;
    padding: 16px 8px;
    line-height: 1.5;
}

/* ── Main Area ── */

.main {
    padding: 24px;
    overflow-y: auto;
}

.main__inner {
    max-width: 780px;
    margin: 0 auto;
    display: grid;
    gap: 20px;
}

/* ── Panels ── */

.panel {
    backdrop-filter: blur(10px);
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 24px;
}

.panel__heading {
    font-size: 1.15rem;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ── Ask Form ── */

.ask-form {
    display: grid;
    gap: 12px;
}

.ask-form__input-row {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.ask-textarea {
    flex: 1;
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 14px 16px;
    font: inherit;
    font-size: 0.95rem;
    background: rgba(255, 255, 255, 0.74);
    resize: vertical;
    min-height: 80px;
    line-height: 1.55;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.ask-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(177, 77, 42, 0.1);
}

.ask-textarea::placeholder {
    color: #9e9387;
}

.btn--submit {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Filters */

.filter-details {
    border-radius: 14px;
}

.filter-summary {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--muted);
    cursor: pointer;
    padding: 6px 0;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color var(--transition);
}

.filter-summary:hover {
    color: var(--accent);
}

.filter-summary::before {
    content: "\25B8";
    font-size: 0.75rem;
    transition: transform var(--transition);
}

.filter-details[open] .filter-summary::before {
    transform: rotate(90deg);
}

.filter-summary::-webkit-details-marker {
    display: none;
}

.filter-body {
    padding-top: 12px;
    display: grid;
    gap: 12px;
}

.filter-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.filter-field {
    display: grid;
    gap: 6px;
}

.filter-field label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--muted);
}

.filter-field select,
.filter-field input[type="number"] {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 9px 10px;
    font: inherit;
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.74);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.filter-field select:focus,
.filter-field input[type="number"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(177, 77, 42, 0.1);
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--muted);
}

.checkbox-row input {
    accent-color: var(--accent);
}

/* ── Buttons ── */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border: 0;
    border-radius: 999px;
    padding: 11px 22px;
    font: inherit;
    font-size: 0.9rem;
    font-weight: 700;
    color: white;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    cursor: pointer;
    transition: filter var(--transition), transform var(--transition), box-shadow var(--transition);
    text-decoration: none;
}

.btn:hover {
    filter: brightness(1.08);
    box-shadow: 0 4px 14px rgba(177, 77, 42, 0.22);
}

.btn:active { transform: scale(0.97); }

.btn--sm {
    padding: 8px 16px;
    font-size: 0.82rem;
}

.btn--full { width: 100%; }

.btn--outline {
    background: transparent;
    color: var(--accent-dark);
    border: 1.5px solid var(--card-border);
}

.btn--outline:hover {
    background: rgba(177, 77, 42, 0.06);
    box-shadow: none;
    filter: none;
}

.btn--danger {
    background: linear-gradient(135deg, #b44949 0%, #8d2d2d 100%);
}

.btn--danger:hover {
    box-shadow: 0 4px 14px rgba(180, 73, 73, 0.22);
}

/* ── Answer Panel ── */

.answer-panel {
    border-left: 5px solid var(--accent);
}

.answer-body {
    white-space: pre-wrap;
    line-height: 1.72;
}

.answer-actions {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
}

/* ── Source Cards ── */

.sources-grid {
    display: grid;
    gap: 16px;
}

.source-card {
    border: 1px solid rgba(125, 49, 23, 0.16);
    border-left: 5px solid var(--accent);
    border-radius: 16px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition);
}

.source-card:hover {
    box-shadow: 0 8px 24px rgba(62, 44, 28, 0.13);
}

.source-card__header {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(125, 49, 23, 0.1);
}

.source-card__num {
    font-weight: 700;
    color: var(--accent);
    font-size: 0.9rem;
}

.source-card__file {
    font-weight: 600;
    font-size: 0.9rem;
}

.source-card__page {
    font-size: 0.82rem;
    color: var(--muted);
}

.score-row {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.score-pill {
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(125, 49, 23, 0.14);
    border-radius: 999px;
    padding: 4px 10px;
    background: #fff6eb;
    color: #6c4b38;
    font-size: 0.78rem;
    font-weight: 600;
}

.chunk-content {
    margin: 0;
    padding: 14px;
    border-radius: 12px;
    background: linear-gradient(180deg, #fffaf3 0%, #f7ead8 100%);
    border: 1px solid rgba(125, 49, 23, 0.12);
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.6;
    font: inherit;
    font-size: 0.85rem;
}

/* ── History & Notes ── */

.history-list {
    display: grid;
    gap: 14px;
}

.history-item {
    padding: 18px;
    border: 1px solid rgba(125, 49, 23, 0.14);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow-sm);
    display: grid;
    gap: 12px;
    transition: box-shadow var(--transition), transform var(--transition);
}

.history-item:hover {
    box-shadow: 0 8px 24px rgba(62, 44, 28, 0.12);
    transform: translateY(-1px);
}

.history-item__q {
    display: grid;
    gap: 4px;
}

.history-item__time {
    font-size: 0.78rem;
    color: var(--muted);
}

.history-item__query {
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.45;
}

.history-item__filters {
    font-size: 0.8rem;
    color: var(--muted);
    font-style: italic;
}

.history-item__a {
    white-space: pre-wrap;
    line-height: 1.65;
    padding: 14px 16px;
    border-radius: 14px;
    background: linear-gradient(180deg, #fffcf7 0%, #faf3e8 100%);
    border: 1px solid rgba(125, 49, 23, 0.08);
    font-size: 0.9rem;
}

.action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 10px;
    border-top: 1px solid rgba(125, 49, 23, 0.08);
}

.section-actions {
    margin-bottom: 14px;
    padding-top: 0;
    border-top: 0;
}

/* ── Toast Notifications ── */

.toast {
    position: fixed;
    top: calc(var(--topbar-h) + 12px);
    right: 20px;
    z-index: 200;
    padding: 12px 20px;
    border-radius: 14px;
    font-size: 0.9rem;
    font-weight: 500;
    line-height: 1.4;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    backdrop-filter: blur(8px);
    max-width: 400px;
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.toast--success {
    background: var(--success);
    border: 1px solid var(--success-border);
    color: #2e6b2e;
}

.toast--error {
    background: var(--error);
    border: 1px solid var(--error-border);
    color: #8d2d2d;
}

.toast--hide {
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
}

/* ── Debug ── */

.debug-block + .debug-block { margin-top: 20px; }

.debug-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 18px;
}

.debug-pill {
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(125, 49, 23, 0.14);
    border-radius: 999px;
    padding: 6px 12px;
    background: #fff6eb;
    color: #6c4b38;
    font-size: 0.82rem;
    font-weight: 700;
}

.debug-block h3 {
    margin: 0 0 10px;
    font-size: 1rem;
    color: var(--accent-dark);
}

.debug-block h4 {
    margin: 0 0 8px;
    font-size: 0.9rem;
    color: var(--muted);
}

.debug-list {
    margin: 0;
    padding-left: 18px;
    display: grid;
    gap: 6px;
}

.debug-list li {
    line-height: 1.5;
    font-size: 0.88rem;
}

/* ── Responsive ── */

@media (max-width: 860px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 16px;
    }

    .filter-row {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 500px) {
    .topbar { padding: 0 16px; }
    .main { padding: 16px; }
    .panel { padding: 18px; border-radius: 16px; }

    .filter-row {
        grid-template-columns: 1fr;
    }

    .ask-form__input-row {
        flex-direction: column;
        align-items: stretch;
    }

    .btn--submit {
        width: 100%;
        border-radius: 14px;
        height: 44px;
    }
}