:root {
    --primary: #27486b;
    --primary-dark: #173854;
    --primary-soft: #eaf1f7;
    --background: #f6f8fb;
    --card: #ffffff;
    --border: #dce5ef;
    --border-strong: #bdcbd9;
    --text: #263241;
    --muted: #627184;
    --danger: #a62020;
    --radius: 14px;
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: light;
}

body {
    min-width: 320px;
    margin: 0;
    color: var(--text);
    background: var(--background);
    font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Noto Sans JP", system-ui, sans-serif;
    line-height: 1.65;
}

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

button,
select,
input[type="checkbox"],
input[type="radio"] {
    cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible {
    outline: 3px solid rgba(39, 72, 107, 0.28);
    outline-offset: 2px;
}

[hidden] {
    display: none !important;
}

.site-header {
    background: #fff;
    border-bottom: 1px solid var(--border);
}

.site-header-inner {
    width: min(100% - 40px, 1080px);
    margin: 0 auto;
    padding: 14px 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--primary-dark);
    font-size: 1.22rem;
    font-weight: 800;
    letter-spacing: 0.03em;
    text-decoration: none;
}

.brand-grid {
    display: grid;
    grid-template-columns: repeat(3, 5px);
    gap: 2px;
    flex: 0 0 auto;
}

.brand-grid i {
    width: 5px;
    height: 5px;
    background: var(--primary);
}

.brand-grid i:nth-child(4),
.brand-grid i:nth-child(8) {
    background: transparent;
}

.page-shell,
.result-shell {
    width: min(100% - 40px, 1080px);
    margin: 0 auto;
}

.hero {
    padding: 36px 0 28px;
}

.hero .eyebrow {
    margin: 0 0 6px;
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.14em;
}

.hero h1 {
    margin: 0;
    color: var(--primary-dark);
    font-size: clamp(1.55rem, 3vw, 2.15rem);
    line-height: 1.35;
}

.hero > p:last-child {
    margin: 10px 0 0;
    color: var(--muted);
}

.builder-layout {
    display: grid;
    grid-template-columns: minmax(0, 570px) minmax(320px, 1fr);
    gap: 26px;
    align-items: start;
    padding-bottom: 50px;
}

.settings-panel {
    display: grid;
    gap: 14px;
}

.settings-card,
.download-card,
.result-preview {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.settings-card {
    padding: 22px;
}

.settings-card h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 18px;
    color: var(--primary-dark);
    font-size: 1.05rem;
    line-height: 1.3;
}

.settings-card h2 > span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 25px;
    padding: 0 8px;
    color: #fff;
    background: var(--primary);
    border-radius: 999px;
    font-size: 0.76rem;
    letter-spacing: 0.04em;
}

.field-group {
    min-width: 0;
    margin: 0 0 18px;
    padding: 0;
    border: 0;
}

.field-group legend,
.input-field > label,
.range-title {
    display: block;
    margin: 0 0 6px;
    color: #425269;
    font-size: 0.82rem;
    font-weight: 700;
}

.segment-control {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.segment-control label {
    position: relative;
}

.segment-control input {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
}

.segment-control span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    border: 1px solid var(--border-strong);
    border-radius: 9px;
    background: #fff;
    font-weight: 700;
}

.segment-control input:checked + span {
    color: #fff;
    border-color: var(--primary);
    background: var(--primary);
}

.segment-control input:focus-visible + span {
    outline: 3px solid rgba(39, 72, 107, 0.28);
    outline-offset: 2px;
}

.two-column-fields {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.input-field {
    min-width: 0;
}

.input-field select,
.input-field input[type="text"],
.input-field input[type="number"] {
    width: 100%;
    min-height: 42px;
    padding: 8px 11px;
    border: 1px solid var(--border-strong);
    border-radius: 9px;
    background: #fff;
}

.input-field input:disabled,
.input-field select:disabled {
    cursor: not-allowed;
    background: #f1f4f7;
}

.preset-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 16px;
}

.preset-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 64px;
    padding: 8px;
    color: var(--primary-dark);
    background: #fff;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
}

.preset-button strong {
    font-size: 0.9rem;
}

.preset-button small {
    color: var(--muted);
    font-size: 0.72rem;
}

.preset-button:hover {
    background: var(--primary-soft);
}

.preset-button.is-active {
    color: #fff;
    border-color: var(--primary);
    background: var(--primary);
}

.preset-button.is-active small {
    color: #e7eff7;
}

.number-mode-list {
    display: grid;
    gap: 8px;
}

.number-mode-card {
    display: flex;
    gap: 11px;
    align-items: flex-start;
    padding: 13px 14px;
    border: 1px solid transparent;
    border-radius: 10px;
    cursor: pointer;
}

.number-mode-card:hover {
    background: #f8fafc;
}

.number-mode-card:has(input:checked) {
    border-color: #cad9e7;
    background: var(--primary-soft);
}

.number-mode-card input {
    width: 18px;
    height: 18px;
    margin: 3px 0 0;
    accent-color: var(--primary);
    flex: 0 0 auto;
}

.number-mode-card > span {
    display: grid;
}

.number-mode-card strong {
    color: var(--primary-dark);
    font-size: 0.94rem;
}

.number-mode-card small {
    color: var(--muted);
    font-size: 0.78rem;
}

.mode-detail {
    display: grid;
    gap: 12px;
    margin: 0 0 8px 42px;
    padding: 12px 14px;
    background: #f8fafc;
    border-left: 2px solid #cbd9e6;
    border-radius: 0 9px 9px 0;
}

.inline-options,
.print-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 18px;
}

.check-option {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    min-width: 0;
    cursor: pointer;
}

.check-option input {
    width: 17px;
    height: 17px;
    margin: 0;
    accent-color: var(--primary);
    flex: 0 0 auto;
}

.check-option span {
    font-size: 0.88rem;
}

.help-text {
    margin: 0;
    color: var(--muted);
    font-size: 0.78rem;
    line-height: 1.6;
}

.help-text code {
    color: var(--text);
    font-size: 0.76rem;
}

.range-group + .range-group {
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

.range-title {
    margin-bottom: 7px;
}

.range-inputs {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 9px;
    align-items: end;
}

.range-inputs > span {
    padding-bottom: 8px;
    color: var(--muted);
}

.print-options {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-bottom: 18px;
}

.page-count-field {
    display: grid;
    grid-template-columns: minmax(0, 150px) minmax(120px, 170px);
    align-items: center;
    gap: 12px;
    margin-bottom: 18px;
}

.page-count-field > label {
    margin: 0;
}

.primary-button,
.download-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    min-height: 46px;
    color: #fff;
    background: var(--primary);
    border: 1px solid var(--primary);
    border-radius: 9px;
    font-weight: 800;
    text-decoration: none;
}

.primary-button {
    width: 100%;
}

.primary-button:hover,
.download-button:hover {
    background: var(--primary-dark);
}

.primary-button:disabled {
    cursor: wait;
    opacity: 0.66;
}

.button-document-icon {
    position: relative;
    width: 14px;
    height: 18px;
    border: 1.7px solid currentColor;
    border-radius: 2px;
}

.button-document-icon::after {
    content: "";
    position: absolute;
    right: 2px;
    bottom: 4px;
    left: 2px;
    height: 1px;
    background: currentColor;
    box-shadow: 0 -4px currentColor;
}

.status-message,
.error-message {
    margin: 11px 0 0;
    font-size: 0.84rem;
}

.status-message:empty,
.error-message:empty {
    display: none;
}

.error-message {
    color: var(--danger);
    font-weight: 700;
}

.preview-panel {
    position: sticky;
    top: 20px;
}

.preview-heading {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin: 0 0 10px;
}

.preview-heading h2 {
    margin: 0;
    color: var(--primary-dark);
    font-size: 0.96rem;
}

.preview-heading span {
    color: var(--muted);
    font-size: 0.72rem;
}

.paper-preview {
    position: relative;
    width: min(100%, 400px);
    aspect-ratio: 210 / 297;
    margin: 0 auto;
    padding: 6% 7% 5%;
    overflow: hidden;
    background: #fff;
    border: 1px solid #aab5c1;
    box-shadow: 0 10px 24px rgba(29, 53, 78, 0.09);
}

.paper-preview::after {
    content: "";
    position: absolute;
    right: -6%;
    bottom: -2%;
    left: -6%;
    height: 5%;
    background: #eef1f4;
    border-radius: 50% 50% 0 0;
}

.paper-preview-header {
    display: grid;
    grid-template-columns: 1.25fr 1fr 0.9fr;
    gap: 5px;
    align-items: center;
    padding-bottom: 2.5%;
    border-bottom: 1px solid #9aa1a8;
    color: #2b3036;
    font-size: clamp(5px, 1vw, 8px);
}

.paper-brand {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    font-weight: 800;
}

.mini-grid {
    width: 2px;
    height: 2px;
    margin: 0 5px 6px 0;
    background: #30363c;
    box-shadow:
        3px 0 #30363c,
        6px 0 #30363c,
        3px 3px #30363c,
        6px 3px #30363c,
        0 6px #30363c,
        6px 6px #30363c;
}

.preview-tables {
    display: grid;
    height: 88%;
    gap: 5%;
    padding: 5% 3% 2%;
}

.preview-tables.is-single {
    align-items: center;
}

.preview-problem {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    min-height: 0;
}

.preview-problem-title {
    display: flex;
    align-items: center;
    gap: 5px;
    min-height: 17px;
    color: #252a30;
    font-size: clamp(6px, 1.2vw, 10px);
    font-weight: 800;
}

.preview-problem-title b {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 15px;
    height: 15px;
    color: #fff;
    background: #353a40;
    border-radius: 50%;
    font-size: 7px;
}

.preview-problem-title small {
    margin-left: auto;
    font-size: 5px;
    font-weight: 600;
}

.preview-grid {
    display: grid;
    align-self: center;
    justify-self: center;
    width: min(100%, calc((var(--columns) + 1) / (var(--rows) + 1) * 100%));
    max-height: 100%;
    aspect-ratio: calc(var(--columns) + 1) / calc(var(--rows) + 1);
    grid-template-columns: repeat(var(--columns-plus-one), 1fr);
    grid-template-rows: repeat(var(--rows-plus-one), 1fr);
    border-top: 1px solid #555;
    border-left: 1px solid #555;
}

.preview-cell {
    min-width: 0;
    min-height: 0;
    border-right: 1px solid #aeb3b8;
    border-bottom: 1px solid #aeb3b8;
    background: #fff;
}

.preview-cell.is-heading {
    background: #f0f1f2;
}

.preview-sprout {
    position: absolute;
    right: 5%;
    bottom: 3.5%;
    z-index: 1;
    width: 14px;
    height: 17px;
}

.preview-sprout i:first-child {
    position: absolute;
    left: 6px;
    bottom: 0;
    width: 1px;
    height: 11px;
    background: #6e7479;
}

.preview-sprout i:nth-child(2),
.preview-sprout i:nth-child(3) {
    position: absolute;
    top: 3px;
    width: 7px;
    height: 4px;
    background: #6e7479;
    border-radius: 80% 20% 80% 20%;
}

.preview-sprout i:nth-child(2) {
    left: 0;
    transform: rotate(30deg);
}

.preview-sprout i:nth-child(3) {
    right: 0;
    transform: scaleX(-1) rotate(30deg);
}

.preview-note {
    margin: 10px 0 0;
    color: var(--muted);
    font-size: 0.74rem;
    text-align: center;
}

.site-footer {
    padding: 22px 20px;
    color: var(--muted);
    background: #fff;
    border-top: 1px solid var(--border);
    text-align: center;
}

.site-footer p {
    margin: 0;
    font-size: 0.78rem;
}

.result-shell {
    padding: 46px 0 56px;
}

.result-hero {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 17px;
    margin-bottom: 28px;
}

.result-hero h1 {
    margin: 0;
    color: var(--primary-dark);
    font-size: clamp(1.45rem, 3vw, 2rem);
}

.result-hero p {
    margin: 2px 0 0;
    color: var(--muted);
}

.success-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    color: #fff;
    background: var(--primary);
    border-radius: 50%;
    font-size: 1.8rem;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.download-card {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 14px;
    align-items: center;
    padding: 20px;
}

.download-card h2 {
    margin: 0;
    color: var(--primary-dark);
    font-size: 1rem;
}

.download-card p {
    margin: 0;
    color: var(--muted);
    font-size: 0.75rem;
}

.pdf-file-icon {
    position: relative;
    width: 34px;
    height: 43px;
    border: 2px solid var(--primary);
    border-radius: 4px;
}

.pdf-file-icon::after {
    content: "";
    position: absolute;
    right: 5px;
    bottom: 9px;
    left: 5px;
    height: 2px;
    background: var(--primary);
    box-shadow: 0 -7px var(--primary), 0 7px var(--primary);
}

.download-button {
    min-height: 40px;
    padding: 7px 16px;
    font-size: 0.82rem;
}

.result-preview {
    padding: 18px;
    margin-top: 18px;
}

.result-preview h2 {
    display: flex;
    align-items: center;
    gap: 7px;
    margin: 0 0 12px;
    color: var(--primary-dark);
    font-size: 0.95rem;
}

.result-preview h2 span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    color: #fff;
    background: var(--primary);
    border-radius: 50%;
    font-size: 0.68rem;
}

.result-preview embed {
    display: block;
    min-height: 600px;
    border: 1px solid var(--border);
    border-radius: 8px;
}

.result-back {
    margin: 26px 0 0;
    text-align: center;
}

.result-back a {
    display: inline-flex;
    padding: 9px 18px;
    color: var(--primary);
    background: #fff;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    font-size: 0.84rem;
    font-weight: 700;
    text-decoration: none;
}

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

    .preview-panel {
        position: static;
    }

    .paper-preview {
        width: min(100%, 440px);
    }

    .preview-problem-title {
        font-size: 9px;
    }

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

@media (max-width: 560px) {
    .site-header-inner,
    .page-shell,
    .result-shell {
        width: min(100% - 24px, 1080px);
    }

    .site-header-inner {
        padding: 11px 0;
    }

    .hero {
        padding: 25px 0 20px;
    }

    .hero h1 {
        font-size: 1.45rem;
    }

    .hero > p:last-child {
        font-size: 0.88rem;
    }

    .settings-card {
        padding: 18px 16px;
    }

    .two-column-fields {
        gap: 10px;
    }

    .preset-grid {
        gap: 7px;
    }

    .preset-button {
        min-height: 60px;
        padding: 6px 3px;
    }

    .mode-detail {
        margin-left: 19px;
        padding: 11px;
    }

    .print-options {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .check-option span {
        white-space: normal;
    }

    .page-count-field {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .paper-preview-header {
        font-size: 6px;
    }

    .result-shell {
        padding-top: 30px;
    }

    .result-hero {
        justify-content: flex-start;
    }

    .success-mark {
        width: 44px;
        height: 44px;
        font-size: 1.45rem;
    }

    .download-card {
        grid-template-columns: auto 1fr;
    }

    .download-button {
        grid-column: 1 / -1;
    }

    .result-preview {
        padding: 12px;
    }

    .result-preview embed {
        height: 560px;
        min-height: 420px;
    }
}