:root {
    color-scheme: light;
    --bg: #f7f7f7;
    --surface: #ffffff;
    --surface-soft: #f0eeee;
    --surface-strong: #171414;
    --text: #171414;
    --muted: #6b6262;
    --line: #ded8d8;
    --accent: #8b1e3f;
    --accent-strong: #64152c;
    --accent-soft: #f3e6eb;
    --gold: #a97c3a;
    --success: #1c7c54;
    --warning: #aa6a18;
    --danger: #a43030;
    --shadow: 0 18px 48px rgba(23, 20, 20, 0.12);
    --radius: 8px;
    --container: 1160px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #111010;
    --surface: #1a1717;
    --surface-soft: #242020;
    --surface-strong: #0b0a0a;
    --text: #f8f5f2;
    --muted: #b8adad;
    --line: #3a3131;
    --accent: #b23a5b;
    --accent-strong: #d85679;
    --accent-soft: #321922;
    --gold: #c69a55;
    --shadow: 0 20px 54px rgba(0, 0, 0, 0.38);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        color-scheme: dark;
        --bg: #111010;
        --surface: #1a1717;
        --surface-soft: #242020;
        --surface-strong: #0b0a0a;
        --text: #f8f5f2;
        --muted: #b8adad;
        --line: #3a3131;
        --accent: #b23a5b;
        --accent-strong: #d85679;
        --accent-soft: #321922;
        --gold: #c69a55;
        --shadow: 0 20px 54px rgba(0, 0, 0, 0.38);
    }
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-size: 16px;
    line-height: 1.7;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select {
    font: inherit;
}

button {
    cursor: pointer;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 100;
    transform: translateY(-140%);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    padding: 10px 14px;
    box-shadow: var(--shadow);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    background: var(--surface-strong);
    color: #f8f5f2;
}

.topbar {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 22px 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.brand-mark {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 50%;
    color: #f8f5f2;
    font-weight: 700;
    letter-spacing: 0;
}

.brand strong,
.brand small {
    display: block;
    line-height: 1.2;
}

.brand small {
    color: rgba(248, 245, 242, 0.68);
    font-size: 0.78rem;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(248, 245, 242, 0.82);
    font-size: 0.92rem;
}

.topbar-actions a,
.theme-toggle {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.06);
    color: inherit;
    padding: 8px 12px;
}

.theme-toggle-icon {
    width: 14px;
    height: 14px;
    border: 2px solid currentColor;
    border-radius: 50%;
    box-shadow: inset -4px -2px 0 currentColor;
}

.hero {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 34px;
    align-items: end;
    padding: 58px 0 68px;
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--accent-strong);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.site-header .eyebrow {
    color: #d7839a;
}

h1,
h2,
h3,
p {
    overflow-wrap: anywhere;
}

h1 {
    max-width: 820px;
    margin: 0;
    font-size: clamp(2.1rem, 6vw, 4.6rem);
    line-height: 1.08;
    letter-spacing: 0;
}

h2 {
    margin: 0;
    font-size: clamp(1.7rem, 4vw, 2.6rem);
    line-height: 1.22;
    letter-spacing: 0;
}

h3 {
    margin: 0;
    font-size: 1.08rem;
    line-height: 1.35;
    letter-spacing: 0;
}

.lead {
    margin: 22px 0 0;
    color: rgba(248, 245, 242, 0.9);
    font-size: clamp(1.05rem, 2vw, 1.35rem);
    line-height: 1.7;
}

.hero-text {
    max-width: 720px;
    margin: 14px 0 0;
    color: rgba(248, 245, 242, 0.7);
}

.hero-metric {
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.07);
    padding: 24px;
}

.hero-metric span,
.hero-metric small {
    display: block;
    color: rgba(248, 245, 242, 0.72);
}

.hero-metric strong {
    display: block;
    margin: 10px 0;
    font-size: clamp(2rem, 5vw, 3.4rem);
    line-height: 1;
}

.section {
    width: min(100% - 32px, var(--container));
    margin: 0 auto;
    padding: 74px 0;
}

.section-heading {
    display: grid;
    grid-template-columns: minmax(0, 0.7fr) minmax(280px, 1fr);
    gap: 28px;
    align-items: end;
    margin-bottom: 28px;
}

.section-heading.compact {
    display: block;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.info-card,
.calculator-panel,
.results-panel,
.metric-card,
.analysis-card,
.codoc-placeholder,
.faq-list details {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: 0 1px 0 rgba(23, 20, 20, 0.04);
}

.info-card {
    padding: 24px;
}

.info-card p {
    margin: 12px 0 0;
    color: var(--muted);
}

.simulator-section {
    padding-top: 30px;
}

.simulator-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.94fr) minmax(360px, 1.06fr);
    gap: 22px;
    align-items: start;
}

.calculator-panel,
.results-panel {
    padding: 24px;
    box-shadow: var(--shadow);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
}

.panel-header.subdued {
    margin-top: 28px;
}

.panel-status,
.badge-soft,
.fx-pill {
    display: inline-flex;
    align-items: center;
    min-height: 32px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent-strong);
    padding: 6px 12px;
    font-size: 0.84rem;
    font-weight: 700;
    white-space: nowrap;
}

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

.field {
    display: grid;
    gap: 8px;
}

.field span,
.radio-group legend {
    font-weight: 700;
}

.field small,
.fx-note,
.radio-group p,
.metric-card small,
.analysis-card dt,
.codoc-placeholder p,
.site-footer p {
    color: var(--muted);
    font-size: 0.9rem;
}

.field input,
.field select {
    width: 100%;
    min-height: 52px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-soft);
    color: var(--text);
    padding: 12px 14px;
    transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.field input:focus,
.field select:focus,
.theme-toggle:focus-visible,
.topbar-actions a:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 22%, transparent);
}

.free-result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 24px;
    border-top: 1px solid var(--line);
    padding-top: 22px;
}

.result-label,
.metric-card span {
    display: block;
    color: var(--muted);
    font-size: 0.88rem;
    font-weight: 700;
}

.result-number,
.metric-card strong {
    display: block;
    margin-top: 4px;
    font-size: clamp(1.8rem, 4vw, 2.9rem);
    line-height: 1.08;
    letter-spacing: 0;
}

.rank-badge {
    width: 58px;
    height: 58px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: #ffffff;
    font-size: 1.6rem;
    font-weight: 800;
}

.rank-s { background: #7b1230; }
.rank-a { background: #9a2f44; }
.rank-b { background: #a97c3a; }
.rank-c { background: #57514d; }
.rank-d { background: #8b5b20; }
.rank-e { background: #8a2c2c; }

.result-comment {
    min-height: 3.4em;
    margin: 16px 0 0;
    color: var(--muted);
}

.premium-inputs,
.premium-results {
    position: relative;
    margin-top: 26px;
}

.premium-results {
    margin-top: 0;
}

.premium-blur {
    transition: filter 180ms ease, opacity 180ms ease;
}

.premium-locked .premium-blur {
    filter: blur(5px);
    pointer-events: none;
    user-select: none;
}

.premium-lock {
    position: absolute;
    inset: 16px;
    z-index: 2;
    display: grid;
    place-items: center;
    align-content: center;
    gap: 7px;
    border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
    border-radius: var(--radius);
    background: color-mix(in srgb, var(--surface) 82%, transparent);
    text-align: center;
    padding: 22px;
    box-shadow: var(--shadow);
}

.premium-lock small {
    color: var(--muted);
}

.lock-icon {
    width: 34px;
    height: 28px;
    position: relative;
    display: inline-block;
    border: 2px solid var(--accent);
    border-radius: 5px;
}

.lock-icon::before {
    content: "";
    position: absolute;
    left: 7px;
    top: -17px;
    width: 16px;
    height: 18px;
    border: 2px solid var(--accent);
    border-bottom: 0;
    border-radius: 12px 12px 0 0;
}

.premium-grid {
    margin-top: 12px;
}

.radio-group {
    margin: 18px 0 0;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}

.radio-group input {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

.radio-group p {
    margin: 12px 0 0;
}

.results-panel {
    position: sticky;
    top: 18px;
}

.result-stack {
    display: grid;
    gap: 14px;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 280ms ease, transform 280ms ease;
}

.result-stack.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.metric-card,
.analysis-card {
    padding: 20px;
}

.metric-card.primary {
    background: var(--surface-strong);
    color: #f8f5f2;
}

.metric-card.primary span {
    color: rgba(248, 245, 242, 0.68);
}

.rank-line {
    display: grid;
    grid-template-columns: 80px minmax(0, 1fr);
    gap: 16px;
    align-items: center;
}

.rank-line strong {
    margin: 0;
    font-size: 4rem;
    color: #ffffff;
}

.rank-line p {
    margin: 0;
    color: rgba(248, 245, 242, 0.76);
}

.metric-card.emphasis {
    border-color: color-mix(in srgb, var(--accent) 50%, var(--line));
    background: var(--accent-soft);
}

.metric-card.break-even {
    border-color: color-mix(in srgb, var(--gold) 60%, var(--line));
}

.metric-card.break-even strong {
    color: var(--gold);
}

.analysis-card h3 {
    margin-bottom: 12px;
}

.analysis-card p {
    margin: 0 0 16px;
    color: var(--muted);
}

.analysis-card dl {
    display: grid;
    gap: 10px;
    margin: 0;
}

.analysis-card div {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    border-top: 1px solid var(--line);
    padding-top: 10px;
}

.analysis-card dd {
    margin: 0;
    font-weight: 800;
    text-align: right;
}

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

.faq-list details {
    padding: 18px 20px;
}

.faq-list summary {
    cursor: pointer;
    font-weight: 800;
}

.faq-list p {
    margin: 12px 0 0;
    color: var(--muted);
}

.codoc-placeholder {
    padding: 24px;
}

.codoc-embed-wrap {
    display: grid;
    gap: 16px;
}

.codoc-entries {
    min-height: 72px;
}

.owner-preview-note {
    border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--line));
    border-radius: var(--radius);
    background: var(--accent-soft);
    color: var(--accent-strong);
    padding: 12px 14px;
    font-weight: 700;
}

.owner-preview-note a {
    margin-left: 8px;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.codoc-placeholder code {
    display: block;
    margin-top: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-soft);
    padding: 14px;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.site-footer {
    border-top: 1px solid var(--line);
    padding: 30px 16px 44px;
}

.site-footer p {
    width: min(100%, var(--container));
    margin: 0 auto;
}

.site-footer .rate-credit {
    margin-top: 8px;
    font-size: 0.82rem;
}

.site-footer a {
    color: var(--accent-strong);
    text-decoration: underline;
    text-underline-offset: 3px;
}

@media (max-width: 980px) {
    .hero,
    .simulator-layout,
    .section-heading {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 42px 0 50px;
    }

    .hero-metric {
        max-width: 420px;
    }

    .results-panel {
        position: static;
    }
}

@media (max-width: 720px) {
    .topbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .topbar-actions {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .topbar-actions a,
    .theme-toggle {
        justify-content: center;
        padding: 9px 8px;
    }

    .section {
        width: min(100% - 24px, var(--container));
        padding: 52px 0;
    }

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

    .calculator-panel,
    .results-panel,
    .info-card,
    .metric-card,
    .analysis-card {
        padding: 18px;
    }

    .panel-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .free-result {
        align-items: flex-start;
    }

    .rank-line {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .rank-line strong {
        font-size: 3.4rem;
    }

    .analysis-card div {
        display: grid;
    }

    .analysis-card dd {
        text-align: left;
    }

    .premium-lock {
        inset: 10px;
        padding: 18px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}