/* ===== Design tokens ===== */
:root {
    --pb-primary: #2563EB;
    --pb-primary-dark: #1D4ED8;
    --pb-bg: #F5F7FA;
    --pb-card: #FFFFFF;
    --pb-border: #E5E7EB;
    --pb-text: #111827;
    --pb-text-secondary: #6B7280;
    --pb-radius-card: 12px;
    --pb-radius-btn: 10px;
    --pb-sidebar-width: 280px;
    --pb-detail-width: 420px;
    --pb-shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.06);
    --pb-shadow-md: 0 8px 24px rgba(17, 24, 39, 0.10);
    --pb-font: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

:root[data-theme="dark"] {
    --pb-primary: #3B82F6;
    --pb-primary-dark: #2563EB;
    --pb-bg: #0F172A;
    --pb-card: #1E293B;
    --pb-border: #334155;
    --pb-text: #F1F5F9;
    --pb-text-secondary: #94A3B8;
    --pb-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --pb-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --pb-primary: #3B82F6;
        --pb-primary-dark: #2563EB;
        --pb-bg: #0F172A;
        --pb-card: #1E293B;
        --pb-border: #334155;
        --pb-text: #F1F5F9;
        --pb-text-secondary: #94A3B8;
    }
}

* { box-sizing: border-box; }

html, body {
    height: 100%;
    margin: 0;
    background: var(--pb-bg);
    color: var(--pb-text);
    font-family: var(--pb-font);
    font-size: 14px;
}

img { max-width: 100%; }

.icon-white { filter: brightness(0) invert(1); }

/* ===== App shell ===== */
.app-shell {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

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

.app-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px 28px 40px;
}

/* ===== Sidebar ===== */
.sidebar {
    width: var(--pb-sidebar-width);
    flex-shrink: 0;
    background: var(--pb-card);
    border-right: 1px solid var(--pb-border);
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 20px 16px;
}

.sidebar-logo { display: flex; align-items: center; gap: 12px; }
.sidebar-logo-icon img { width: 40px; height: 40px; display: block; }
.sidebar-title { font-weight: 700; font-size: 17px; }
.sidebar-subtitle { font-size: 12px; color: var(--pb-text-secondary); }

.sidebar-section-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--pb-text-secondary);
    padding: 8px 20px;
}

.category-tree {
    flex: 1;
    overflow-y: auto;
    padding: 4px 8px 16px;
}

.tree-row {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 10px 7px 0;
    border-radius: 8px;
    cursor: pointer;
    user-select: none;
}

.tree-row:hover { background: var(--pb-bg); }
.tree-row.active { background: color-mix(in srgb, var(--pb-primary) 12%, transparent); color: var(--pb-primary); font-weight: 600; }
.tree-row.drag-over { outline: 2px dashed var(--pb-primary); outline-offset: -2px; }
.tree-row.dragging { opacity: 0.5; }

.tree-toggle {
    width: 18px;
    height: 18px;
    border: none;
    background: none;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--pb-text-secondary);
}
.tree-toggle img { width: 12px; height: 12px; }
.tree-toggle-empty { visibility: hidden; }

.tree-icon { width: 15px; height: 15px; flex-shrink: 0; opacity: 0.75; }

.tree-label {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 13.5px;
}

.tree-count {
    font-size: 11px;
    color: var(--pb-text-secondary);
    background: var(--pb-bg);
    border-radius: 999px;
    padding: 1px 7px;
    flex-shrink: 0;
}
.tree-row.active .tree-count { background: rgba(255,255,255,0.6); }

.tree-children { position: relative; }

.sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--pb-border);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-user {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-top: 6px;
    padding: 8px 10px 2px;
    border-top: 1px solid var(--pb-border);
}
.sidebar-user-name {
    font-size: 12.5px;
    color: var(--pb-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.sidebar-logout-form { margin: 0; }

.btn-sidebar {
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: flex-start;
    font-size: 13px;
    border-radius: var(--pb-radius-btn);
}
.btn-sidebar img { width: 16px; height: 16px; }

.sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    z-index: 1040;
}

/* ===== Header ===== */
.app-header {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 28px;
    background: var(--pb-card);
    border-bottom: 1px solid var(--pb-border);
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    flex: 1 1 320px;
    max-width: 480px;
}
.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    opacity: 0.55;
}
.search-input {
    width: 100%;
    padding: 9px 12px 9px 36px;
    border: 1px solid var(--pb-border);
    border-radius: var(--pb-radius-btn);
    background: var(--pb-bg);
    color: var(--pb-text);
    font-size: 13.5px;
}
.search-input:focus {
    outline: none;
    border-color: var(--pb-primary);
    background: var(--pb-card);
}

.category-filter-dropdown .dropdown-toggle {
    border-radius: var(--pb-radius-btn);
    font-size: 13px;
}
.category-filter-menu {
    max-height: 320px;
    overflow-y: auto;
    min-width: 240px;
}

.include-sub-check {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--pb-text-secondary);
    white-space: nowrap;
}

.header-spacer { flex: 1; }

.btn-icon, .btn-icon-sm {
    border: 1px solid transparent;
    background: none;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--pb-text-secondary);
}
.btn-icon { width: 38px; height: 38px; }
.btn-icon:hover { background: var(--pb-bg); }
.btn-icon-sm { width: 28px; height: 28px; }
.btn-icon-sm:hover { background: var(--pb-bg); }
.btn-icon-sm img, .btn-icon img { width: 16px; height: 16px; }

.btn-new-prompt {
    border-radius: var(--pb-radius-btn);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    font-weight: 600;
}

/* ===== Bootstrap overrides ===== */
.btn { border-radius: var(--pb-radius-btn); }
.btn-primary { background-color: var(--pb-primary); border-color: var(--pb-primary); }
.btn-primary:hover, .btn-primary:focus { background-color: var(--pb-primary-dark); border-color: var(--pb-primary-dark); }
.btn-outline-secondary { color: var(--pb-text); border-color: var(--pb-border); }
.btn-outline-secondary:hover { background: var(--pb-bg); color: var(--pb-text); border-color: var(--pb-border); }
.form-control, .form-select {
    border-radius: 8px;
    border-color: var(--pb-border);
    background: var(--pb-card);
    color: var(--pb-text);
}
.form-control:focus, .form-select:focus {
    border-color: var(--pb-primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--pb-primary) 15%, transparent);
}
.modal-content { border-radius: var(--pb-radius-card); border: none; background: var(--pb-card); color: var(--pb-text); }
.dropdown-menu { border-radius: 10px; border-color: var(--pb-border); background: var(--pb-card); color: var(--pb-text); }
.dropdown-item { color: var(--pb-text); font-size: 13.5px; }
.dropdown-item:hover, .dropdown-item:focus { background: var(--pb-bg); color: var(--pb-text); }

/* ===== Content header ===== */
.content-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 6px;
}
.content-title { font-size: 22px; font-weight: 700; margin: 0; }
.content-subtitle { color: var(--pb-text-secondary); margin: 2px 0 0; font-size: 13.5px; }
.content-subtitle a { color: var(--pb-primary); text-decoration: none; }

.content-controls { display: flex; align-items: center; gap: 10px; }
.sort-label { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--pb-text-secondary); }
.sort-label .form-select { width: auto; }

.view-toggle .btn { padding: 6px 10px; }
.view-toggle .btn img { width: 15px; height: 15px; }
.view-toggle .btn.active { background: var(--pb-bg); border-color: var(--pb-primary); }

.result-count { color: var(--pb-text-secondary); font-size: 13px; margin: 6px 0 18px; }

/* ===== Prompt grid ===== */
.prompt-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
}

.prompt-grid.prompt-grid-list {
    grid-template-columns: 1fr;
}

.prompt-card {
    position: relative;
    background: var(--pb-card);
    border: 1px solid var(--pb-border);
    border-radius: var(--pb-radius-card);
    padding: 18px;
    cursor: pointer;
    transition: box-shadow 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}
.prompt-card:hover { box-shadow: var(--pb-shadow-md); transform: translateY(-2px); }
.prompt-card.active { border-color: var(--pb-primary); }

.prompt-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 8px;
}
.prompt-card-title {
    font-size: 15px;
    font-weight: 600;
    margin: 0;
    line-height: 1.35;
}
.prompt-card-type-icon { width: 16px; height: 16px; opacity: 0.5; flex-shrink: 0; }

.prompt-card-favorite {
    position: absolute;
    top: 16px;
    right: 42px;
    width: 15px;
    height: 15px;
    filter: invert(70%) sepia(90%) saturate(500%) hue-rotate(360deg) brightness(1.05);
}

.badge-type {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 9px;
    border-radius: 999px;
    margin-top: 8px;
    background: color-mix(in srgb, var(--pb-primary) 12%, transparent);
    color: var(--pb-primary);
}
.badge-type-article, .badge-type-other { background: color-mix(in srgb, #DC2626 12%, transparent); color: #DC2626; }
.badge-type-image-prompt { background: color-mix(in srgb, #7C3AED 12%, transparent); color: #7C3AED; }
.badge-type-email { background: color-mix(in srgb, #D97706 14%, transparent); color: #D97706; }
.badge-type-markdown, .badge-type-template { background: color-mix(in srgb, #0891B2 14%, transparent); color: #0891B2; }
.badge-type-snippet { background: color-mix(in srgb, #059669 14%, transparent); color: #059669; }

.badge-role {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 9px;
    border-radius: 999px;
    margin-top: 4px;
    background: color-mix(in srgb, var(--pb-text-secondary) 14%, transparent);
    color: var(--pb-text-secondary);
}
.badge-role-admin { background: color-mix(in srgb, #059669 14%, transparent); color: #059669; }

.prompt-card-description {
    color: var(--pb-text-secondary);
    font-size: 13px;
    margin: 10px 0 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.prompt-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}
.prompt-card-date { font-size: 12px; color: var(--pb-text-secondary); }
.prompt-card-actions { display: flex; gap: 4px; }

.prompt-grid-list .prompt-card {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 8px;
    padding: 14px 18px;
}
.prompt-grid-list .prompt-card-description { -webkit-line-clamp: 1; margin: 4px 0 0; }
.prompt-grid-list .prompt-card-footer { grid-column: 2; grid-row: 1 / span 2; }

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--pb-text-secondary);
}
.empty-state img { width: 40px; height: 40px; opacity: 0.4; margin-bottom: 12px; }

/* ===== Detail panel ===== */
.detail-panel {
    width: var(--pb-detail-width);
    flex-shrink: 0;
    background: var(--pb-card);
    border-left: 1px solid var(--pb-border);
    padding: 22px 24px;
    overflow-y: auto;
}

.detail-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}
.detail-title { font-size: 19px; font-weight: 700; margin: 0; }

.detail-badge-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 6px;
}
#detail-favorite-btn.favorited img { filter: invert(70%) sepia(90%) saturate(500%) hue-rotate(360deg) brightness(1.05); }

.detail-block { margin-top: 20px; }
.detail-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--pb-text-secondary);
    text-transform: uppercase;
    margin-bottom: 6px;
}
.detail-description { font-size: 13.5px; margin: 0; }

.breadcrumb-path { font-size: 13px; display: flex; flex-wrap: wrap; gap: 4px; align-items: center; }
.breadcrumb-sep { color: var(--pb-text-secondary); }

.detail-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag-chip {
    font-size: 11.5px;
    padding: 3px 9px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--tag-color, #6B7280) 14%, transparent);
    color: var(--tag-color, #6B7280);
}

.detail-tabs { margin-top: 22px; border-bottom-color: var(--pb-border); }
.detail-tabs .nav-link {
    color: var(--pb-text-secondary);
    border: none;
    font-size: 13.5px;
    padding: 8px 4px;
    margin-right: 18px;
    border-bottom: 2px solid transparent;
}
.detail-tabs .nav-link.active { color: var(--pb-primary); border-bottom-color: var(--pb-primary); background: none; }

.detail-content-viewer {
    max-height: 420px;
    overflow-y: auto;
    background: var(--pb-bg);
    border: 1px solid var(--pb-border);
    border-radius: 10px;
    padding: 14px 16px;
    font-size: 13.5px;
    line-height: 1.6;
}
.detail-content-viewer p { margin: 0 0 10px; }
.detail-content-viewer p:last-child { margin-bottom: 0; }

.md-code {
    background: #0F172A;
    color: #E2E8F0;
    border-radius: 8px;
    padding: 12px 14px;
    overflow-x: auto;
    font-family: 'Consolas', 'Menlo', monospace;
    font-size: 12.5px;
    margin: 8px 0;
}
.tok-keyword { color: #93C5FD; font-weight: 600; }
.tok-string { color: #86EFAC; }
.tok-number { color: #FCD34D; }
.tok-comment { color: #64748B; font-style: italic; }
.tok-variable { color: #F0ABFC; }
.md-checkbox { display: inline-block; width: 16px; }

.versions-list { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; }
.version-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border: 1px solid var(--pb-border);
    border-radius: 10px;
    font-size: 13px;
}
.version-date { color: var(--pb-text-secondary); font-size: 12px; }

.detail-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 22px;
    font-size: 13px;
}

.detail-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 22px;
}
.btn-block-full { display: flex; align-items: center; justify-content: center; gap: 8px; }

/* ===== Trash & Settings ===== */
.trash-list { display: flex; flex-direction: column; gap: 10px; }
.trash-item, .settings-feedback { }
.trash-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--pb-card);
    border: 1px solid var(--pb-border);
    border-radius: var(--pb-radius-card);
    padding: 14px 18px;
}
.trash-item-title { font-weight: 600; font-size: 13.5px; }
.trash-item-meta { color: var(--pb-text-secondary); font-size: 12px; }
.trash-item-actions { display: flex; gap: 8px; }

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}
.settings-card {
    background: var(--pb-card);
    border: 1px solid var(--pb-border);
    border-radius: var(--pb-radius-card);
    padding: 20px;
}
.settings-card-title { font-size: 15px; font-weight: 700; margin: 0 0 14px; }
.settings-card-text { color: var(--pb-text-secondary); font-size: 13px; margin-bottom: 14px; }
.settings-feedback { font-size: 12.5px; color: var(--pb-primary); margin-top: 10px; min-height: 16px; }
.export-buttons { display: flex; flex-wrap: wrap; gap: 8px; }
.export-buttons .btn { display: flex; align-items: center; gap: 6px; }

/* ===== Prompt content editor / preview ===== */
.prompt-content-editor { font-family: 'Consolas', 'Menlo', monospace; font-size: 13px; }
.prompt-content-preview {
    max-height: 320px;
    overflow-y: auto;
    background: var(--pb-bg);
    border: 1px solid var(--pb-border);
    border-radius: 8px;
    padding: 12px 14px;
    font-size: 13px;
}

/* ===== Toasts ===== */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 2000;
}
.pb-toast {
    background: var(--pb-text);
    color: var(--pb-card);
    padding: 12px 18px;
    border-radius: 10px;
    font-size: 13.5px;
    box-shadow: var(--pb-shadow-md);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.2s ease, transform 0.2s ease;
}
.pb-toast-visible { opacity: 1; transform: translateY(0); }
.pb-toast-error { background: #B91C1C; }

/* ===== Context menu ===== */
.context-menu {
    position: fixed;
    z-index: 2100;
    background: var(--pb-card);
    border: 1px solid var(--pb-border);
    border-radius: 10px;
    box-shadow: var(--pb-shadow-md);
    padding: 6px;
    min-width: 200px;
}
.context-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    text-align: left;
    padding: 8px 10px;
    border: none;
    background: none;
    border-radius: 6px;
    font-size: 13px;
    color: var(--pb-text);
    cursor: pointer;
}
.context-menu-item:hover { background: var(--pb-bg); }
.context-menu-item img { width: 14px; height: 14px; opacity: 0.7; }
.context-menu-divider { height: 1px; background: var(--pb-border); margin: 6px 4px; }

/* ===== Responsive ===== */
@media (max-width: 992px) {
    .sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        z-index: 1050;
        transform: translateX(-100%);
    }
    .sidebar.sidebar-visible { transform: translateX(0); }
    .detail-panel {
        position: fixed;
        inset: 0;
        width: 100%;
        z-index: 1030;
    }
    .app-content { padding: 18px 16px 32px; }
}

@media (min-width: 993px) {
    #sidebar-open, #sidebar-close { display: none; }
}

@media (max-width: 640px) {
    .app-header { padding: 12px 16px; }
    .include-sub-check { display: none; }
    .content-controls { width: 100%; justify-content: space-between; }
    .prompt-grid { grid-template-columns: 1fr; }
}

/* ===== Login page ===== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--pb-bg);
    padding: 24px;
}

.login-card {
    width: 100%;
    max-width: 380px;
    background: var(--pb-card);
    border: 1px solid var(--pb-border);
    border-radius: var(--pb-radius-card);
    box-shadow: var(--pb-shadow-md);
    padding: 32px 30px;
}

.login-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 22px;
}
.login-logo img { width: 40px; height: 40px; display: block; }

.login-title {
    font-weight: 700;
    font-size: 19px;
    text-align: center;
    margin: 0 0 4px;
}
.login-subtitle {
    font-size: 13px;
    color: var(--pb-text-secondary);
    text-align: center;
    margin: 0 0 24px;
}

.login-alert {
    font-size: 13px;
    border-radius: 8px;
    padding: 10px 14px;
    margin-bottom: 18px;
}