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

:root {
    --green: #4f883d;
    --green-light: #e8f4e5;
    --green-hover: #3d6d2e;
    --green-pale: #f0faf0;
    --accent-text: #23411b;
    --accent-border: #bfd3b4;
    --accent-highlight: #dff1da;
    --accent-highlight-border: #9dc38f;
    --bg: #f5f6f8;
    --surface: #ffffff;
    --surface-soft: #fbfcfd;
    --border: #e2e5ea;
    --border-strong: #ccd3dc;
    --text: #1a1e26;
    --text-2: #5a6070;
    --text-3: #8b93a4;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.07);
    --shadow-md: 0 4px 18px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --header-h: 52px;
    --settings-w: 408px;
    --page-width: 794px;
    --page-height: 1123px;
}

html,
body {
    height: 100%;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.5;
    overflow: hidden;
}

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

button {
    cursor: pointer;
}

textarea {
    resize: vertical;
}

.app {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--header-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 0 20px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

.header-logo,
.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-logo {
    font-weight: 600;
    font-size: 15px;
}

.workspace {
    display: flex;
    flex: 1;
    margin-top: var(--header-h);
    min-height: 0;
}

.settings-panel {
    width: var(--settings-w);
    min-width: 300px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.settings-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.settings-scroll::-webkit-scrollbar {
    width: 5px;
}

.settings-scroll::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 99px;
}

.divider {
    width: 1px;
    background: var(--border);
}

.preview-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.preview-toolbar {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.preview-label {
    color: var(--text-3);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 12px;
    font-weight: 600;
}

.preview-container {
    flex: 1;
    overflow: auto;
    padding: 24px;
}

.preview-page-wrap {
    display: flex;
    justify-content: center;
    padding-bottom: 32px;
}

.preview-page {
    width: var(--page-width);
    min-height: var(--page-height);
    background-color: var(--surface);
    background-image: linear-gradient(
        to bottom,
        transparent calc(var(--page-height) - 2px),
        #d6dce6 calc(var(--page-height) - 2px),
        #d6dce6 var(--page-height)
    );
    background-size: 100% var(--page-height);
    background-repeat: repeat-y;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
    border-radius: 4px;
    padding: 52px 62px;
    position: relative;
}

.section {
    margin-bottom: 24px;
}

.section-title {
    margin-bottom: 12px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-3);
}

.section-export {
    margin-top: auto;
    padding-top: 4px;
}

.field,
.field-row {
    margin-bottom: 12px;
}

.field-row {
    display: flex;
    gap: 10px;
}

.two-col .field {
    flex: 1;
}

.field label {
    display: block;
    margin-bottom: 4px;
    color: var(--text-2);
    font-size: 15px;
    font-weight: 500;
}

.field input,
.field select,
.field textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    padding: 8px 10px;
    font-size: 15px;
    transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
    outline: none;
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(79, 136, 61, 0.12);
    background: #fff;
}

.field-hint {
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-3);
}

.toggle-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
}

.toggle-option {
    position: relative;
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface);
    color: var(--text-2);
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
}

.toggle-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.toggle-option span {
    font-weight: 600;
    font-size: 14px;
}

.toggle-option:has(input:checked) {
    border-color: var(--accent-border);
    background: var(--green-pale);
    color: var(--green-hover);
    box-shadow: inset 0 0 0 1px rgba(79, 136, 61, 0.1);
}

.options-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
    padding: 6px 10px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 15px;
    transition: background 0.12s;
}

.checkbox-row:hover {
    background: var(--green-pale);
}

.checkbox-row input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--green);
    flex-shrink: 0;
}

.btn-primary,
.btn-secondary {
    border-radius: var(--radius);
    padding: 9px 12px;
    font-size: 13px;
    font-weight: 600;
    transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.btn-primary {
    border: none;
    background: var(--green);
    color: #fff;
    box-shadow: 0 2px 8px rgba(79, 136, 61, 0.32);
}

.btn-primary:hover {
    background: var(--green-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
}

.btn-secondary:hover {
    background: var(--bg);
}

.btn-panel {
    width: 100%;
}

.panel-actions {
    display: grid;
    gap: 10px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 12px;
}

.stat-card {
    display: grid;
    gap: 4px;
    padding: 12px 10px;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: linear-gradient(180deg, #ffffff 0%, #f9fbfd 100%);
    text-align: center;
}

.stat-card strong {
    font-size: 24px;
    line-height: 1;
    color: var(--green-hover);
}

.stat-card span {
    font-size: 12px;
    color: var(--text-3);
}

.status-box {
    min-height: 70px;
    padding: 12px 14px;
    border-radius: var(--radius-lg);
    background: var(--surface-soft);
    border: 1px solid var(--border);
    color: var(--text-2);
    font-size: 13px;
    line-height: 1.5;
}

.status-box.is-warning {
    background: #fff9ea;
    border-color: #ecd8a0;
    color: #825c0f;
}

.status-box.is-success {
    background: var(--green-pale);
    border-color: var(--accent-border);
    color: var(--accent-text);
}

.status-box.is-error {
    background: #fff2f2;
    border-color: #e1b8b8;
    color: #8c2f2f;
}

.worksheet {
    position: relative;
    min-height: calc(var(--page-height) - 104px);
    display: flex;
    flex-direction: column;
}

.worksheet::before {
    content: "";
    position: absolute;
    inset: 160px 70px 150px 70px;
    background:
        radial-gradient(circle at center, rgba(79, 136, 61, 0.04), transparent 58%),
        radial-gradient(circle at 30% 50%, rgba(79, 136, 61, 0.03), transparent 30%),
        radial-gradient(circle at 70% 60%, rgba(79, 136, 61, 0.03), transparent 30%);
    pointer-events: none;
}

.worksheet::after {
    content: "A B C D E F G H I J K L M N O P R S T U W Y Z";
    position: absolute;
    left: 50%;
    top: 48%;
    transform: translate(-50%, -50%) rotate(-18deg);
    font-size: 58px;
    letter-spacing: 0.22em;
    color: rgba(79, 136, 61, 0.05);
    white-space: nowrap;
    pointer-events: none;
}

.worksheet > *,
.answer-key-page > * {
    position: relative;
    z-index: 1;
}

.sheet-meta {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 18px;
    font-size: 12px;
}

.meta-column {
    display: grid;
    gap: 8px;
    flex: 1;
}

.meta-column.is-right {
    max-width: 220px;
}

.meta-field {
    display: flex;
    align-items: center;
    gap: 8px;
}

.meta-field span {
    min-width: 58px;
    font-weight: 600;
}

.line {
    flex: 1;
    border-bottom: 1px solid #9ea5b0;
    min-height: 18px;
}

.rule {
    height: 1px;
    background: #2a2f37;
    margin-bottom: 10px;
    opacity: 0.45;
}

.sheet-title {
    text-align: center;
    font-size: 32px;
    line-height: 1.12;
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -0.04em;
}

.sheet-title span {
    display: inline-block;
    padding: 0 10px 4px;
    border-bottom: 4px solid var(--accent-highlight-border);
}

.instruction-box,
.answer-key-intro {
    display: grid;
    gap: 8px;
    margin-bottom: 18px;
    padding: 14px 16px;
    border-radius: 16px;
    border: 1px solid var(--accent-border);
    background: linear-gradient(180deg, rgba(79, 136, 61, 0.06) 0%, rgba(79, 136, 61, 0.03) 100%);
}

.instruction-label {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--green-hover);
}

.instruction-text,
.answer-key-intro {
    font-size: 15px;
    line-height: 1.55;
}

.tiles-section {
    margin-bottom: 18px;
}

.tile-rack {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.tile {
    position: relative;
    width: 54px;
    height: 54px;
    border-radius: 14px;
    border: 1px solid #d2d7de;
    background:
        linear-gradient(180deg, #ffffff 0%, #f1f3f6 88%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(213, 218, 225, 0.9));
    box-shadow:
        0 8px 16px rgba(44, 48, 58, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.tile::before {
    content: "";
    position: absolute;
    inset: 4px;
    border-radius: 11px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0));
    pointer-events: none;
}

.tile-letter {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    font-size: 24px;
    font-weight: 800;
    color: #1f2731;
    text-transform: uppercase;
}

.tile-score {
    position: absolute;
    right: 9px;
    bottom: 7px;
    font-size: 11px;
    font-weight: 700;
    color: #3e4856;
}

.sheet-subtitle {
    margin: 18px 0 10px;
    font-size: 14px;
    font-weight: 700;
    color: #222833;
}

.answer-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    margin-bottom: 18px;
}

.answer-column {
    display: grid;
    gap: 10px;
}

.answer-head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 86px;
    gap: 14px;
    align-items: end;
    margin-bottom: 2px;
    font-weight: 800;
    font-size: 16px;
}

.answer-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 86px;
    gap: 14px;
    align-items: end;
    min-height: 32px;
}

.answer-line {
    height: 22px;
    border-bottom: 1px dashed #8f97a3;
}

.answer-score-line {
    height: 22px;
    border-bottom: 1px solid #8f97a3;
}

.word-bank {
    display: grid;
    gap: 10px;
    margin-bottom: 18px;
}

.word-bank-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    justify-content: center;
}

.word-chip {
    padding: 6px 12px;
    border-radius: 999px;
    border: 1px solid var(--accent-border);
    background: rgba(79, 136, 61, 0.08);
    font-size: 15px;
}

.rules-box {
    margin-top: auto;
    padding: 14px 16px;
    border-radius: 16px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(244, 248, 252, 0.92));
    border: 1px solid var(--border);
}

.rules-title {
    margin-bottom: 6px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-3);
    font-weight: 700;
}

.rules-text {
    font-size: 13px;
    line-height: 1.55;
    color: var(--text-2);
}

.sheet-footer {
    margin-top: 18px;
    padding-top: 10px;
    border-top: 1px solid rgba(42, 47, 55, 0.45);
    text-align: center;
    font-size: 12px;
    font-weight: 600;
    color: #4b5360;
}

.answer-key-page {
    display: flex;
    flex-direction: column;
    min-height: calc(var(--page-height) - 104px);
}

.answer-key-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 18px;
    padding-left: 22px;
    margin-bottom: 18px;
}

.answer-key-list li {
    font-size: 16px;
    line-height: 1.5;
}

.empty-state {
    display: grid;
    gap: 12px;
    place-items: center;
    min-height: calc(var(--page-height) - 104px);
    padding: 80px 40px;
    text-align: center;
}

.empty-state-card {
    max-width: 460px;
    padding: 28px;
    border-radius: 20px;
    background: linear-gradient(180deg, #ffffff 0%, #f7faf6 100%);
    border: 1px solid var(--accent-border);
    box-shadow: var(--shadow-md);
}

.empty-state-card h2 {
    margin-bottom: 8px;
    font-size: 28px;
}

.empty-state-card p {
    color: var(--text-2);
    font-size: 15px;
}

.export-root {
    position: fixed;
    inset: 0;
    overflow: auto;
    background: #ffffff;
    opacity: 0;
    pointer-events: none;
    z-index: 300;
}

.export-root.is-active {
    opacity: 0.01;
}

.export-document {
    width: var(--page-width);
    margin: 0 auto;
    background: #ffffff;
}

.export-root .preview-page {
    box-shadow: none;
    border-radius: 0;
    background-image: none;
}

.export-root .pdf-page-break {
    break-after: page;
    page-break-after: always;
}

@media (max-width: 1200px) {
    .settings-panel {
        width: 360px;
    }

    .preview-page {
        transform-origin: top center;
        transform: scale(0.94);
    }
}

@media (min-width: 800px) and (max-width: 980px) {
    .header {
        padding: 0 14px;
        gap: 12px;
    }

    .header-actions {
        gap: 8px;
    }

    .btn-primary,
    .btn-secondary {
        padding: 8px 10px;
        font-size: 12px;
    }

    .settings-panel {
        width: 320px;
        min-width: 320px;
    }

    .settings-scroll {
        padding: 16px;
    }

    .preview-toolbar,
    .preview-container {
        padding-left: 16px;
        padding-right: 16px;
    }

    .preview-page {
        transform-origin: top center;
        transform: scale(0.8);
    }
}

@media (max-width: 799px) {
    body {
        overflow: auto;
    }

    .header {
        position: sticky;
        padding: 12px 16px;
        height: auto;
        flex-wrap: wrap;
        align-items: stretch;
    }

    .header-actions {
        width: 100%;
        justify-content: stretch;
    }

    .header-actions > * {
        flex: 1;
    }

    .workspace {
        margin-top: 0;
        flex-direction: column;
    }

    .settings-panel {
        width: 100%;
        min-width: 0;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .divider {
        display: none;
    }

    .preview-page {
        transform: none;
        width: min(var(--page-width), calc(100vw - 32px));
        min-height: auto;
        background-image: none;
        padding: 32px 24px;
    }

    .sheet-title {
        font-size: 26px;
    }

    .answer-grid,
    .answer-key-list {
        grid-template-columns: 1fr;
    }
}

@media print {
    body {
        background: #fff;
        overflow: visible;
    }

    .header,
    .settings-panel,
    .divider,
    .preview-toolbar {
        display: none !important;
    }

    .workspace,
    .preview-area,
    .preview-container,
    .preview-page-wrap {
        display: block;
        margin: 0;
        padding: 0;
        overflow: visible;
    }

    .preview-page {
        width: auto;
        min-height: auto;
        box-shadow: none;
        border-radius: 0;
        padding: 0;
        background: #fff;
    }

    @page {
        size: A4;
        margin: 12mm;
    }
}