:root {
    color-scheme: light;
    --bg: #edf1f5;
    --panel: #ffffff;
    --panel-soft: #f7f9fc;
    --line: #d9e2ec;
    --line-strong: #b8c7d6;
    --text: #102235;
    --muted: #63748a;
    --primary: #1769aa;
    --primary-dark: #0f548b;
    --success: #157f55;
    --danger: #b9362d;
    --warning: #936812;
    --shadow: 0 18px 42px rgba(16, 34, 53, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
    letter-spacing: 0;
}

button,
input,
select,
textarea {
    font: inherit;
}

button {
    cursor: pointer;
}

.app-header {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 18px;
    background: #102235;
    color: #fff;
}

.app-header h1 {
    margin: 0;
    font-size: 20px;
}

.app-header p {
    margin: 3px 0 0;
    color: #b8c8da;
    font-size: 12px;
}

.header-actions,
.content-toolbar,
.view-tabs,
.modal-actions,
.prompt-actions,
.language-row,
.list-create-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.btn,
.icon-btn,
.tab,
.rich-toolbar button,
.pill-btn {
    min-height: 34px;
    border: 1px solid var(--line);
    border-radius: 7px;
    background: #fff;
    color: var(--text);
    padding: 0 12px;
    font-weight: 650;
    font-size: 13px;
}

.btn:hover,
.icon-btn:hover,
.tab:hover,
.rich-toolbar button:hover,
.pill-btn:hover {
    border-color: var(--line-strong);
    background: #f1f5f9;
}

.btn.primary,
.tab.active {
    color: #fff;
    border-color: var(--primary);
    background: var(--primary);
}

.btn.primary:hover {
    background: var(--primary-dark);
}

.btn.danger,
.pill-btn.danger {
    color: var(--danger);
    border-color: #efc8c3;
}

.app-layout {
    display: grid;
    grid-template-columns: 280px minmax(0, 1fr);
    min-height: calc(100vh - 68px);
}

.filters-panel,
.content-panel {
    min-width: 0;
}

.filters-panel {
    background: var(--panel);
    border-right: 1px solid var(--line);
    padding: 14px;
    overflow-y: auto;
}

.panel-head,
.section-head,
.modal-head,
.question-card-head,
.list-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.panel-head h2,
.section-head h3,
.modal-head h2,
.list-head h3 {
    margin: 0;
}

.panel-head h2 {
    font-size: 16px;
}

.field {
    display: grid;
    gap: 6px;
    margin: 10px 0;
}

.field span {
    color: #41546b;
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
}

.field input,
.field select,
.field textarea,
.list-create-row input,
.language-row input {
    width: 100%;
    min-height: 38px;
    border: 1px solid var(--line);
    border-radius: 7px;
    background: #fff;
    color: var(--text);
    padding: 8px 10px;
}

.field textarea {
    resize: vertical;
}

.content-panel {
    padding: 16px;
    overflow: auto;
}

.content-toolbar {
    justify-content: space-between;
    margin-bottom: 14px;
}

#activeUserLabel {
    margin-left: 8px;
    color: var(--muted);
    font-size: 13px;
}

.question-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 12px;
}

.question-card,
.list-card,
.empty-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(16, 34, 53, 0.05);
}

.question-card {
    display: grid;
    gap: 12px;
    padding: 14px;
}

.empty-card {
    padding: 24px;
    color: var(--muted);
}

.question-card h3 {
    margin: 0;
    font-size: 15px;
    line-height: 1.35;
}

.question-meta,
.question-actions,
.reaction-row,
.card-footer,
.option-row,
.blank-bank,
.translation-head {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.question-meta span,
.status-chip,
.type-chip {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    border-radius: 999px;
    background: #eef3f8;
    color: #405168;
    padding: 0 9px;
    font-size: 12px;
    font-weight: 700;
}

.status-chip.archived {
    color: var(--danger);
    background: #fff1ef;
}

.status-chip.draft {
    color: var(--warning);
    background: #fff8e8;
}

.card-answer {
    border-top: 1px solid var(--line);
    padding-top: 10px;
    color: #27384b;
    font-size: 13px;
}

.rich-content,
.rich-editor {
    line-height: 1.5;
}

.rich-content img,
.rich-editor img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    vertical-align: middle;
}

.rich-content table,
.rich-editor table {
    border-collapse: collapse;
    max-width: 100%;
    margin: 8px 0;
}

.rich-content td,
.rich-content th,
.rich-editor td,
.rich-editor th {
    border: 1px solid var(--line-strong);
    padding: 6px 8px;
    min-width: 50px;
}

.rich-editor {
    min-height: 120px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    padding: 10px;
    outline: none;
    overflow: auto;
}

.rich-editor:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(23, 105, 170, 0.12);
}

.rich-toolbar {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.editor-section {
    display: grid;
    gap: 10px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel-soft);
}

.option-editor,
.tf-editor,
.fib-editor,
.short-editor,
.translation-card,
.formula-card {
    display: grid;
    gap: 10px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.option-row {
    align-items: flex-start;
}

.option-row label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 38px;
    font-weight: 700;
}

.option-row .rich-editor {
    flex: 1 1 240px;
    min-height: 70px;
}

.fib-bank-list,
.translations-container,
.lists-container {
    display: grid;
    gap: 10px;
}

.blank-bank input {
    min-height: 36px;
    border: 1px solid var(--line);
    border-radius: 7px;
    padding: 7px 9px;
}

.blank-bank input:first-child {
    width: 120px;
}

.blank-bank input:nth-child(2) {
    flex: 1 1 220px;
}

.modal {
    width: min(1040px, calc(100vw - 24px));
    border: none;
    padding: 0;
    background: transparent;
}

.small-modal {
    width: min(760px, calc(100vw - 24px));
}

.modal::backdrop {
    background: rgba(7, 18, 31, 0.52);
}

.modal-card {
    display: grid;
    gap: 14px;
    max-height: calc(100vh - 32px);
    overflow: auto;
    border-radius: 8px;
    background: var(--panel);
    box-shadow: var(--shadow);
    padding: 16px;
}

.form-grid,
.import-layout {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.wide {
    grid-column: 1 / -1;
}

.modal-actions {
    justify-content: flex-end;
}

.import-actions {
    grid-column: 1 / -1;
    justify-content: flex-start;
    margin-top: -2px;
}

.spacer {
    flex: 1;
}

.prompt-panel,
.import-preview {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel-soft);
    padding: 12px;
}

.prompt-panel summary {
    color: #41546b;
    cursor: pointer;
    font-size: 12px;
    font-weight: 800;
    list-style-position: inside;
    text-transform: uppercase;
}

.prompt-panel .form-grid {
    margin-top: 10px;
}

.import-error {
    margin-top: 10px;
    border: 1px solid #efc8c3;
    border-radius: 8px;
    background: #fff7f6;
    color: #5f231f;
    padding: 10px;
}

.import-error ul {
    margin: 8px 0 0;
    padding-left: 18px;
}

.import-error code {
    color: #102235;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 1px 5px;
}

#aiPromptText {
    max-height: 220px;
    overflow-x: hidden;
    overflow-y: auto;
    overflow-wrap: anywhere;
    margin: 10px 0 0;
    white-space: pre-wrap;
    word-break: break-word;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    padding: 10px;
    font-size: 12px;
}

.list-manager {
    display: grid;
    gap: 12px;
}

.list-create-row input {
    flex: 1 1 240px;
}

.list-card {
    padding: 14px;
}

.list-items {
    display: grid;
    gap: 8px;
    margin-top: 10px;
}

.mini-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    border: 1px solid var(--line);
    border-radius: 7px;
    padding: 8px;
    background: #fff;
}

.formula-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 8px;
}

.formula-card {
    text-align: left;
}

.diagram-preview {
    min-height: 180px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    padding: 10px;
    overflow: auto;
}

.toast {
    position: fixed;
    right: 16px;
    bottom: 16px;
    min-width: 220px;
    max-width: calc(100vw - 32px);
    transform: translateY(20px);
    opacity: 0;
    pointer-events: none;
    border-radius: 8px;
    background: #102235;
    color: #fff;
    padding: 11px 13px;
    box-shadow: var(--shadow);
    transition: opacity 0.18s, transform 0.18s;
    font-size: 13px;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 980px) {
    .app-layout {
        grid-template-columns: 1fr;
    }

    .filters-panel {
        border-right: none;
        border-bottom: 1px solid var(--line);
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 8px;
    }

    .panel-head {
        grid-column: 1 / -1;
    }

    .field {
        margin: 0;
    }
}

@media (max-width: 720px) {
    .app-header,
    .content-toolbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .header-actions,
    .header-actions .btn,
    .view-tabs,
    .view-tabs .tab {
        width: 100%;
    }

    .btn,
    .tab {
        justify-content: center;
    }

    .filters-panel,
    .form-grid,
    .import-layout {
        grid-template-columns: 1fr;
    }

    .question-grid {
        grid-template-columns: 1fr;
    }

    .option-row {
        display: grid;
    }

    .modal-card {
        padding: 12px;
    }
}