html[data-theme="dark"] {
    color-scheme: dark;
    --bg: #1b1d1a;
    --card: #191b17;
    --surface: #121410;
    --line: rgba(231, 221, 189, .12);
    --text: #f4efe1;
    --muted: #c4baa0;
    --accent: #d8943a;
    --accent-strong: #a85c20;
    --panel: rgba(255,255,255,.035);
    --button-text: #1c1307;
    --radius: 18px;
}

html[data-theme="light"] {
    color-scheme: light;
    --bg: #efe2c3;
    --card: #f1e5ca;
    --surface: #faf5e8;
    --line: rgba(110, 84, 42, .16);
    --text: #2f2415;
    --muted: #6d5a39;
    --accent: #b6691d;
    --accent-strong: #8b4716;
    --panel: rgba(255,255,255,.42);
    --button-text: #fff7ef;
    --radius: 18px;
}

* { box-sizing: border-box; }
html { background: var(--card); }
body {
    margin: 0;
    background:
        radial-gradient(circle at top left, rgba(217, 148, 58, .12), transparent 28%),
        radial-gradient(circle at bottom right, rgba(168, 92, 32, .1), transparent 24%),
        var(--card);
    color: var(--text);
    font-family: Georgia, "Times New Roman", serif;
    transition: background .25s ease, color .25s ease;
    overflow-x: hidden;
    -webkit-text-size-adjust: 100%;
}

.page { max-width: 1280px; margin: 0 auto; padding: 14px 16px 32px; }
.topbar { display: flex; justify-content: flex-end; margin-bottom: 10px; }
.topbar-controls { display: flex; align-items: center; gap: 10px; }
.topbar .language-select { min-width: 168px; }
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--surface) 88%, transparent);
    color: var(--text);
    cursor: pointer;
    transition: background .25s ease, border-color .25s ease, color .25s ease, transform .2s ease;
}
.home-link { text-decoration: none; }
.theme-toggle:hover { transform: translateY(-1px); }
.theme-toggle:focus-visible, .home-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.theme-toggle svg { width: 22px; height: 22px; display: block; }
.theme-toggle .sun { display: none; }
html[data-theme="light"] .theme-toggle .sun { display: block; }
html[data-theme="light"] .theme-toggle .moon { display: none; }

.card { background: transparent; border: none; border-radius: 0; padding: 12px 16px 18px; }
.hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
    align-items: center;
}
.hero-copy { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.hero-copy .muted { max-width: 52rem; }
.hero-badge {
    display: inline-block;
    width: max-content;
    padding: 7px 11px;
    border-radius: 999px;
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
    background: color-mix(in srgb, var(--accent) 14%, transparent);
    font-family: Arial, sans-serif;
    font-size: .88rem;
    font-weight: 700;
}
.hero-title { margin: 0; font-size: clamp(2.1rem, 4vw, 3.4rem); line-height: 1.02; }
.hero-version { margin-top: -2px; color: var(--muted); letter-spacing: .05em; font-size: .82rem; text-transform: uppercase; font-family: Arial, sans-serif; }
.muted, .field-help, .panel-kicker, .family-card span, .result-summary { color: var(--muted); line-height: 1.6; margin: 0; }
.converter-format-hint {
    min-height: 2.8em;
    font-size: .92rem;
    flex: 1 0 100%;
    padding-left: 70px;
}
.converter-format-hint strong {
    color: var(--text);
}

.selection-panel {
    margin-top: 18px;
    padding: 20px;
    border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line));
    border-radius: 24px;
    background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 8%, var(--surface)) 0%, color-mix(in srgb, var(--surface) 92%, transparent) 100%);
    box-shadow: 0 16px 26px rgba(20, 17, 10, .08);
}
.selection-panel-header { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.selection-kicker {
    font-family: Arial, sans-serif;
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--accent);
}
.selection-title { margin: 0; font-size: clamp(1.15rem, 2.4vw, 1.55rem); }

.field-grid { display: grid; gap: 14px; }
.converter-grid { align-items: end; }
.converter-grid-single { grid-template-columns: 1fr; }
.converter-grid-pair { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.converter-grid-result-row { align-items: start; margin-top: 14px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field-inline { justify-content: flex-end; }
.field-inline-button { margin-top: 10px; width: max-content; }
.field-inline-control {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px 12px;
}
.field-inline-control > label {
    flex: 0 0 58px;
    margin: 0;
}
.field-inline-control > select,
.field-inline-control > input,
.field-inline-control > .result-inline {
    flex: 1 1 0;
}
.field-inline-control > .field-inline-button {
    margin-top: 0;
    flex: 0 0 auto;
}
label {
    font-family: Arial, sans-serif;
    font-weight: 700;
    font-size: .95rem;
}
select, input {
    width: 100%;
    min-width: 0;
    padding: 12px 13px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text);
    font: inherit;
}
input::placeholder {
    color: color-mix(in srgb, var(--muted) 92%, transparent);
    opacity: 1;
}

button, .ghost-button, .chip-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 13px 16px;
    border-radius: 12px;
    border: 0;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: var(--button-text);
    font-family: Arial, sans-serif;
    font-size: .95rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: transform .16s ease, box-shadow .16s ease, filter .16s ease;
}
button:hover, .ghost-button:hover, .chip-button:hover { transform: translateY(-1px); }
button:active, .ghost-button:active, .chip-button:active { transform: translateY(0) scale(.98); }
.ghost-button.slim { padding: 9px 12px; font-size: .88rem; }
.chip-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.chip-button { padding: 10px 14px; border-radius: 999px; }

.layout { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 14px; }
.results-panel, .section, .faq-item, .family-card, .detail-card {
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--panel);
}
.results-panel { padding: 14px; }
.result-card {
    display: grid;
    gap: 16px;
    padding: 18px;
    border-radius: 18px;
    background: linear-gradient(180deg, color-mix(in srgb, var(--surface) 84%, transparent), color-mix(in srgb, var(--panel) 96%, transparent));
}
.result-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}
.result-header h2, .section h2 { margin: 0; }
.panel-kicker {
    font-family: Arial, sans-serif;
    font-size: .78rem;
    letter-spacing: .1em;
    text-transform: uppercase;
}
.result-value {
    font-size: clamp(2rem, 4vw, 3.5rem);
    line-height: 1.04;
    word-break: break-word;
}
.result-inline {
    min-height: 52px;
    padding: 12px 13px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    display: flex;
    align-items: center;
    font-size: clamp(1.1rem, 2vw, 1.55rem);
    line-height: 1.3;
    word-break: break-word;
}
.result-summary-inline {
    margin-top: 14px;
}
.detail-grid, .family-grid, .faq {
    display: grid;
    gap: 14px;
}
.detail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.detail-card {
    display: grid;
    gap: 6px;
    padding: 14px 16px;
    background: color-mix(in srgb, var(--surface) 88%, transparent);
}
.detail-card strong, .family-card strong, .faq-item h3 {
    font-family: Arial, sans-serif;
}
.callout {
    padding: 12px 14px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    font-family: Arial, sans-serif;
}
.family-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 16px; }
.family-card {
    display: grid;
    gap: 6px;
    padding: 14px 16px;
    transition: border-color .2s ease, transform .2s ease, background .2s ease;
}
.family-button {
    width: 100%;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--panel) 94%, transparent);
    color: var(--text);
    text-align: left;
    align-items: start;
    justify-content: start;
    box-shadow: none;
}
.family-button:hover {
    border-color: color-mix(in srgb, var(--accent) 46%, var(--line));
    background: color-mix(in srgb, var(--accent) 8%, var(--surface));
}
.family-card.is-active {
    border-color: color-mix(in srgb, var(--accent) 46%, var(--line));
    background: color-mix(in srgb, var(--accent) 10%, var(--surface));
}

.section { margin-top: 26px; padding: 24px; border-radius: 20px; background: color-mix(in srgb, var(--surface) 82%, transparent); }
.faq { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 18px; }
.faq-item { padding: 18px; border-radius: 16px; background: color-mix(in srgb, var(--panel) 94%, transparent); }
.faq-item h3 { margin: 0 0 8px; font-size: 1rem; }
.faq-item p { margin: 0; color: var(--muted); line-height: 1.6; }

.site-footer {
    margin-top: 26px;
    padding: 20px 4px 0;
    border-top: 1px solid var(--line);
    display: flex;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    color: var(--muted);
    font-family: Arial, sans-serif;
    font-size: .95rem;
}
.site-footer-links { display: flex; gap: 12px; flex-wrap: wrap; }
.site-footer a { color: inherit; }
.ad-slot { margin-top: 26px; }

@media (max-width: 1100px) {
    .family-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
    .hero { grid-template-columns: 1fr; }
    .hero-visual { justify-self: stretch; width: 100%; min-height: 0; }
    .detail-grid, .faq { grid-template-columns: 1fr; }
    .converter-grid-pair { grid-template-columns: 1fr; }
    .family-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
    .page { padding-inline: 12px; }
    .card { padding-inline: 6px; }
    .selection-panel, .section, .results-panel { padding: 16px; }
    .converter-grid-single, .converter-grid-pair, .family-grid { grid-template-columns: 1fr; }
    .field-inline-control > label { flex-basis: 52px; }
    .converter-format-hint { padding-left: 64px; }
    .result-header { flex-direction: column; align-items: stretch; }
    .topbar-controls { width: 100%; justify-content: flex-end; flex-wrap: wrap; }
    .topbar .language-select { min-width: 0; flex: 1 1 180px; }
}