:root {
    --bg: #f4f8ff;
    --bg-strong: #2e4f8f;
    --card: rgba(255, 255, 255, 0.82);
    --card-strong: #ffffff;
    --line: rgba(56, 87, 143, 0.16);
    --text: #24416f;
    --muted: #5f78a7;
    --accent: #5a6dff;
    --accent-soft: #dfe4ff;
    --warm: #ffb884;
    --mint: #bff3ed;
    --shadow: 0 18px 60px rgba(42, 75, 138, 0.18);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "Noto Sans SC", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(255, 191, 187, 0.65), transparent 28%),
        radial-gradient(circle at bottom right, rgba(181, 245, 234, 0.7), transparent 24%),
        linear-gradient(180deg, #f7fbff 0%, #eef5ff 48%, #edf4ff 100%);
    min-height: 100vh;
}

body[data-paper-size="a3"] {
    --print-page-size: A3 landscape;
}

body[data-paper-size="a4"] {
    --print-page-size: A4 landscape;
}

body[data-print-mode="teacher"] .teacher-answer {
    display: block;
}

body[data-print-mode="teacher"] #teacherModeButton,
body[data-print-mode="student"] #studentModeButton {
    background: var(--accent-soft);
    border-color: rgba(90, 109, 255, 0.25);
    color: var(--accent);
}

body[data-print-layer="clean"] .stone-layer {
    display: none;
}

.page-shell {
    width: min(1320px, calc(100% - 40px));
    margin: 0 auto;
    padding: 32px 0 72px;
}

.hero,
.section,
.workspace {
    margin-bottom: 28px;
}

.hero {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 24px;
    align-items: stretch;
}

.hero-copy,
.hero-poster,
.section,
.workspace {
    background: var(--card);
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: var(--shadow);
    backdrop-filter: blur(12px);
    border-radius: 28px;
}

.hero-copy {
    padding: 42px;
}

.eyebrow {
    margin: 0 0 10px;
    font-size: 0.8rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted);
}

.hero h1,
.section-heading h2,
.panel-head h3,
.preview-head h3 {
    margin: 0;
    font-family: "Baloo 2", sans-serif;
    line-height: 1.05;
}

.hero h1 {
    font-size: clamp(2.4rem, 4vw, 4.6rem);
    max-width: 10ch;
}

.hero-text {
    max-width: 56ch;
    font-size: 1rem;
    line-height: 1.8;
    color: var(--muted);
    margin: 18px 0 24px;
}

.hero-actions,
.action-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 18px;
    border-radius: 999px;
    border: 1px solid transparent;
    text-decoration: none;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.button:hover {
    transform: translateY(-1px);
}

.button.primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 12px 24px rgba(90, 109, 255, 0.28);
}

.button.ghost {
    background: rgba(255, 255, 255, 0.72);
    color: var(--text);
    border-color: rgba(53, 94, 166, 0.14);
}

.hero-points {
    margin: 24px 0 0;
    padding-left: 18px;
    color: var(--muted);
    line-height: 1.85;
}

.hero-poster {
    position: relative;
    padding: 26px;
    background: linear-gradient(180deg, #325192 0%, #304b8a 100%);
    overflow: hidden;
}

.hero-poster::before,
.hero-poster::after {
    content: "";
    position: absolute;
    border-radius: 999px;
    opacity: 0.7;
}

.hero-poster::before {
    width: 260px;
    height: 260px;
    background: radial-gradient(circle, rgba(255, 211, 210, 0.9), rgba(255, 211, 210, 0));
    left: -60px;
    bottom: -80px;
}

.hero-poster::after {
    width: 260px;
    height: 260px;
    background: radial-gradient(circle, rgba(193, 255, 250, 0.82), rgba(193, 255, 250, 0));
    right: -70px;
    bottom: -90px;
}

.mini-poster {
    position: relative;
    z-index: 1;
    height: 100%;
    min-height: 340px;
    border-radius: 24px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.9));
    box-shadow: 0 18px 40px rgba(13, 25, 58, 0.28);
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 18px;
}

.mini-badge,
.tag,
.rule-level {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
}

.mini-badge {
    padding: 8px 14px;
    background: rgba(90, 109, 255, 0.12);
    color: var(--accent);
}

.mini-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    width: min(280px, 100%);
}

.mini-board span {
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 1;
    border-radius: 16px;
    background: #f4f7ff;
    color: var(--text);
    font-weight: 700;
}

.section,
.workspace {
    padding: 28px;
}

.section-heading {
    margin-bottom: 22px;
}

.section-heading h2 {
    font-size: clamp(1.8rem, 2.8vw, 3rem);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.feature-card {
    padding: 22px;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid rgba(68, 95, 160, 0.1);
}

.feature-card h3,
.rule-card h4,
.data-summary h4 {
    margin: 0 0 8px;
    font-size: 1.1rem;
}

.feature-card p,
.rule-card p,
.preview-head p,
.panel-head p,
.field span,
.toggle span,
.data-summary p {
    margin: 0;
    color: var(--muted);
    line-height: 1.7;
}

.workspace-grid {
    display: grid;
    grid-template-columns: 360px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
}

.control-panel,
.preview-panel {
    background: rgba(255, 255, 255, 0.76);
    border-radius: 24px;
    border: 1px solid rgba(68, 95, 160, 0.1);
    padding: 20px;
}

.generator-form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.print-settings {
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid rgba(68, 95, 160, 0.12);
}

.panel-head.compact {
    margin-bottom: 12px;
}

.field,
.toggle {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.field-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.field select,
.field input,
.field textarea {
    width: 100%;
    border: 1px solid rgba(81, 111, 184, 0.16);
    border-radius: 16px;
    background: rgba(246, 249, 255, 0.88);
    color: var(--text);
    padding: 14px 15px;
    font: inherit;
    outline: none;
}

.field textarea {
    resize: vertical;
    min-height: 120px;
}

.toggles {
    gap: 10px;
}

.toggle {
    flex-direction: row;
    align-items: center;
    border-radius: 16px;
    background: rgba(244, 247, 255, 0.88);
    border: 1px solid rgba(81, 111, 184, 0.1);
    padding: 12px 14px;
}

.toggle input {
    width: 18px;
    height: 18px;
    margin: 0;
}

.preview-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 16px;
}

.preview-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.print-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.print-mode-switch {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.tag {
    padding: 8px 12px;
    background: rgba(90, 109, 255, 0.12);
    color: var(--accent);
}

.tag.accent {
    background: rgba(255, 184, 132, 0.2);
    color: #d96f1c;
}

.practice-panel {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    align-items: center;
    margin-bottom: 16px;
    padding: 16px 18px;
    border-radius: 20px;
    background: rgba(245, 248, 255, 0.95);
}

.practice-status {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    flex: 1;
}

.practice-label {
    margin: 0 0 4px;
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}

.practice-status strong {
    display: block;
    color: var(--text);
    line-height: 1.5;
}

.practice-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.poster-layout {
    display: grid;
    grid-template-columns: 190px minmax(0, 1fr) 190px;
    gap: 16px;
    align-items: center;
    padding: 18px;
    border-radius: 28px;
    background:
        radial-gradient(circle at 10% 90%, rgba(255, 210, 208, 0.8), transparent 24%),
        radial-gradient(circle at 90% 90%, rgba(191, 243, 237, 0.9), transparent 24%),
        linear-gradient(180deg, #31508f 0%, #2f4b88 100%);
    overflow: hidden;
}

.print-header,
.print-footer {
    grid-column: 1 / -1;
    text-align: center;
    color: #ffffff;
}

.print-header h4,
.print-header p,
.print-footer {
    margin: 0;
}

.print-header h4 {
    font-family: "Baloo 2", sans-serif;
    font-size: 1.8rem;
    line-height: 1.1;
    margin-bottom: 4px;
}

.print-header p,
.print-footer {
    color: rgba(255, 255, 255, 0.88);
}

.rule-card {
    align-self: center;
    background: rgba(49, 75, 136, 0.16);
    color: #fff;
    padding: 18px;
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.16);
    backdrop-filter: blur(6px);
}

.rule-card h4,
.rule-card p,
.rule-level {
    color: #fff;
}

.rule-level {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.16);
    margin-bottom: 12px;
}

.poster-board {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.board-svg-wrapper {
    width: 100%;
    background: rgba(255, 255, 255, 0.94);
    border-radius: 28px;
    box-shadow: 0 18px 34px rgba(9, 21, 53, 0.28);
    padding: 14px;
}

.board-svg-wrapper svg {
    display: block;
    width: 100%;
    height: auto;
}

.teacher-answer {
    display: none;
    width: 100%;
    padding: 14px 16px;
    border-radius: 18px;
    background: rgba(255, 247, 233, 0.94);
    color: #835016;
}

.teacher-answer h4,
.teacher-answer p {
    margin: 0;
}

.teacher-answer h4 {
    margin-bottom: 6px;
}

.board-cell {
    cursor: pointer;
}

.board-cell rect {
    transition: fill 0.16s ease, stroke 0.16s ease;
}

.board-cell:hover rect {
    fill: #f4f7ff;
    stroke: #8fa6dc;
}

.stone-layer {
    display: block;
}

.stone-shadow {
    opacity: 0.18;
}

.stone-blue {
    fill: #5a6dff;
}

.stone-orange {
    fill: #ff9f57;
}

.win-cell rect {
    fill: #fff6e8;
    stroke: #ffb15e;
    stroke-width: 2;
}

.board-footnote {
    color: rgba(255, 255, 255, 0.88);
    font-size: 0.86rem;
    text-align: center;
}

.avatar-card {
    justify-self: center;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    width: 180px;
    min-height: 98px;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.86);
    color: var(--text);
    box-shadow: 0 10px 24px rgba(23, 38, 84, 0.12);
}

.avatar-badge {
    display: grid;
    place-items: center;
    width: 54px;
    height: 54px;
    border-radius: 18px;
    background: rgba(90, 109, 255, 0.16);
    color: var(--accent);
    font-family: "Baloo 2", sans-serif;
    font-size: 1.45rem;
    font-weight: 700;
    flex-shrink: 0;
}

.avatar-badge.orange {
    background: rgba(255, 184, 132, 0.24);
    color: #d96f1c;
}

.avatar-card-left {
    grid-column: 1;
    justify-self: start;
}

.avatar-card-right {
    grid-column: 3;
    justify-self: end;
}

.avatar-card p {
    margin: 0;
    font-weight: 700;
    font-size: 0.95rem;
}

.avatar-card span {
    text-align: left;
    font-size: 0.76rem;
    color: var(--muted);
    line-height: 1.45;
}

.avatar-card > div:last-child,
.avatar-copy {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.print-footer {
    padding-top: 4px;
    font-size: 0.98rem;
    letter-spacing: 0.04em;
}

.data-summary {
    margin-top: 16px;
    padding: 18px;
    border-radius: 20px;
    background: rgba(245, 248, 255, 0.95);
}

@media (max-width: 1100px) {
    .hero,
    .workspace-grid,
    .feature-grid {
        grid-template-columns: 1fr;
    }

    .practice-panel,
    .practice-status {
        grid-template-columns: 1fr;
        display: grid;
    }

    .practice-panel {
        justify-content: stretch;
    }

    .print-toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .poster-layout {
        grid-template-columns: 1fr;
    }

    .rule-card,
    .avatar-card {
        width: 100%;
        justify-self: stretch;
    }

    .avatar-card-left,
    .avatar-card-right {
        grid-column: auto;
    }

    .avatar-card {
        justify-content: flex-start;
    }
}

@media (max-width: 720px) {
    .page-shell {
        width: min(100% - 24px, 1320px);
        padding-top: 16px;
    }

    .hero-copy,
    .section,
    .workspace,
    .control-panel,
    .preview-panel {
        padding: 18px;
    }

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

@media print {
    @page {
        size: var(--print-page-size, A4 landscape);
        margin: 10mm;
    }

    body {
        background: #ffffff;
    }

    .hero,
    .section,
    .control-panel,
    .practice-panel,
    .print-toolbar,
    .preview-tags,
    .board-footnote,
    .data-summary {
        display: none !important;
    }

    .page-shell,
    .workspace,
    .preview-panel {
        width: 100%;
        margin: 0;
        padding: 0;
        box-shadow: none;
        border: 0;
        background: transparent;
    }

    .workspace-grid {
        display: block;
    }

    .preview-head {
        margin-bottom: 8mm;
    }

    .preview-head h3 {
        font-size: 24pt;
    }

    .preview-head p {
        font-size: 11pt;
    }

    .poster-layout {
        padding: 8mm;
        border-radius: 0;
        gap: 8mm;
        break-inside: avoid;
        grid-template-columns: 42mm minmax(0, 1fr) 42mm;
    }

    .rule-card {
        min-height: 48mm;
        background: rgba(49, 75, 136, 0.22);
        box-shadow: none;
    }

    .board-svg-wrapper {
        box-shadow: none;
        padding: 5mm;
    }

    .print-header h4 {
        font-size: 22pt;
    }

    .print-header p,
    .print-footer {
        font-size: 10.5pt;
    }

    .avatar-card {
        width: auto;
        min-height: 34mm;
        break-inside: avoid;
    }

    body[data-print-mode="student"] .teacher-answer {
        display: none !important;
    }

    body[data-print-mode="teacher"] .teacher-answer {
        display: block !important;
        margin-top: 4mm;
    }

    body[data-paper-size="a3"] .preview-head h3 {
        font-size: 30pt;
    }

    body[data-paper-size="a3"] .poster-layout {
        grid-template-columns: 56mm minmax(0, 1fr) 56mm;
        gap: 10mm;
    }

    body[data-paper-size="a3"] .print-header h4 {
        font-size: 28pt;
    }

    body[data-paper-size="a3"] .avatar-card {
        min-height: 42mm;
    }
}