/* ===== Calcify — Design Tokens ===== */
:root {
    --bg: #f5f5f5;
    --surface: #ffffff;
    --surface-hover: #fafafa;
    --border: rgba(0, 0, 0, 0.08);
    --border-strong: rgba(0, 0, 0, 0.12);
    --accent: #c5a059;
    --accent-soft: rgba(197, 160, 89, 0.12);
    --text: #1a1a1a;
    --text-muted: #666666;
    --text-secondary: #555555;
    --text-tertiary: #888888;
    --bg-subtle: rgba(0, 0, 0, 0.02);
    --bg-hover: rgba(0, 0, 0, 0.05);
    --radius: 14px;
    --font: "Segoe UI", system-ui, -apple-system, Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
    --bg: #1a1a1a;
    --surface: #262626;
    --surface-hover: #2c2c2c;
    --border: rgba(255, 255, 255, 0.06);
    --border-strong: rgba(255, 255, 255, 0.1);
    --accent: #c5a059;
    --accent-soft: rgba(197, 160, 89, 0.15);
    --text: #e5e5e5;
    --text-muted: #999999;
    --text-secondary: #c8c8c8;
    --text-tertiary: #b7b7b7;
    --bg-subtle: rgba(255, 255, 255, 0.02);
    --bg-hover: rgba(255, 255, 255, 0.05);
}

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

body {
    font-family: var(--font);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 560px;
    margin: 0 auto;
    padding: 0 20px;
}

.site-header { padding: 28px 0; border-bottom: 1px solid var(--border); }

.brand {
    display: flex;
    align-items: baseline;
    gap: 8px;
    font-weight: 300;
    letter-spacing: 0.04em;
}
.brand-link {
    display: inline-flex;
    align-items: baseline;
    color: var(--text);
    cursor: pointer;
    text-decoration: none !important;
    -webkit-text-decoration: none !important;
    border-bottom: none !important;
    border: none !important;
    outline: none !important;
    box-shadow: none !important;
    -webkit-tap-highlight-color: transparent;
    background: none;
}
.brand-link:link,
.brand-link:visited,
.brand-link:hover,
.brand-link:active,
.brand-link:focus,
.brand-link:focus-visible {
    color: var(--text) !important;
    text-decoration: none !important;
    -webkit-text-decoration: none !important;
    border-bottom: none !important;
    border: none !important;
    outline: none !important;
    box-shadow: none !important;
    background: none;
}
.brand-link .brand-mark {
    color: var(--text);
    text-decoration: none !important;
    border-bottom: none !important;
    transition: color 0.2s ease;
}
.brand-link:hover .brand-mark {
    color: var(--accent);
}
.brand-link .brand-mark::after,
.brand-link .brand-mark::before {
    display: none !important;
    content: none !important;
    text-decoration: none !important;
}
.brand-mark { font-size: 1.5rem; font-weight: 600; color: var(--text); }
.brand-divider { color: var(--accent); font-size: 1.2rem; }
.brand-module {
    font-size: 1rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

.content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
    padding: 40px 0;
}

.card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
}
.card-title { font-size: 1.5rem; font-weight: 600; color: var(--text); text-align: center; }
.card-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 6px;
    margin-bottom: 28px;
}

.form { display: flex; flex-direction: column; gap: 20px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-size: 0.85rem; color: var(--text-muted); letter-spacing: 0.03em; }

.field input {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    color: var(--text);
    background-color: var(--bg);
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    font-family: inherit;
}
.field input::placeholder { color: var(--text-muted); }
.field input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.field input[type="number"]::-webkit-outer-spin-button,
.field input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.field input[type="number"] { -moz-appearance: textfield; appearance: textfield; }

.btn-primary {
    margin-top: 8px;
    padding: 15px;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--bg);
    background-color: var(--accent);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
    font-family: inherit;
}
.btn-primary:hover { background-color: #d4af37; }
.btn-primary:active { transform: translateY(1px); }

.results {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
.result-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 20px 16px;
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
}
.result-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.result-value { font-size: 1.35rem; font-weight: 600; color: var(--text); }

.calculator-nav {
    display: flex;
    justify-content: center;
    padding: 20px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.site-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-muted);
    gap: 16px;
}

.language-switcher {
    display: inline-flex;
    align-items: center;
    gap: 1px;
    padding: 2px;
    background-color: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: 6px;
}
.language-option {
    min-width: 28px;
    padding: 3px 8px;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    background: transparent;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: inherit;
    transition: color 0.2s ease, background-color 0.2s ease;
}
.language-option:hover {
    color: var(--text);
    background-color: var(--bg-hover);
}
.language-option.is-active {
    color: var(--bg);
    background-color: var(--accent);
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    min-height: 32px;
    padding: 0 8px;
    background: transparent;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    color: var(--text-muted);
    cursor: pointer;
    font-family: inherit;
    font-size: 1rem;
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.theme-toggle:hover {
    color: var(--text);
    border-color: var(--accent);
    background: var(--accent-soft);
}

@media (max-width: 480px) {
    .results { grid-template-columns: 1fr; }
    .card { padding: 24px; }
    .site-footer {
        flex-wrap: wrap;
        justify-content: center;
        text-align: center;
    }
}

/* ===== Main Hub Menu Styles ===== */
.menu-list {
    list-style: none !important;
    padding: 0 !important;
    margin: 24px 0 0 0 !important;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.menu-item-link {
    display: block !important;
    text-decoration: none !important;
    background-color: var(--bg) !important;
    border: 1px solid var(--border-strong) !important;
    border-radius: 12px !important;
    padding: 20px !important;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease !important;
    cursor: pointer;
}

.menu-item-link:link,
.menu-item-link:visited {
    text-decoration: none !important;
    color: var(--text) !important;
}

.menu-item-link:hover {
    border-color: var(--accent) !important;
    box-shadow: 0 0 0 4px var(--accent-soft) !important;
    transform: translateY(-2px) !important;
    background-color: var(--surface-hover) !important;
}

.menu-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text) !important;
    margin-bottom: 6px;
}

.menu-desc {
    color: var(--text-muted) !important;
    font-size: 0.9rem;
    line-height: 1.4;
}

.home-content {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.home-hero {
    position: relative;
    overflow: hidden;
    padding: 18px 24px 16px;
    background: linear-gradient(180deg, var(--accent-soft) 0%, var(--surface) 100%);
}

.home-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
    color: var(--accent);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.home-hero .card-title,
.home-hero .card-subtitle {
    text-align: left;
}

.home-hero .card-title {
    font-size: clamp(1.35rem, 3vw, 1.95rem);
    line-height: 1.02;
    max-width: none;
    white-space: nowrap;
}

.home-lead {
    margin-top: 6px;
    max-width: 720px;
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

.home-section-head {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 18px;
}

.home-section-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
}

.home-section-copy {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.55;
}

.home-tools {
    box-shadow: 0 0 0 1px rgba(197, 160, 89, 0.14);
}

.home-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-top: 0 !important;
}

.home-grid > li {
    min-width: 0;
}

.home-card {
    height: 100%;
}

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

.home-card-badge {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 0 10px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.04em;
}

.home-card-arrow {
    color: var(--text-muted);
    font-size: 1rem;
    transition: transform 0.2s ease, color 0.2s ease;
}

.menu-item-link:hover .home-card-arrow {
    color: var(--accent);
    transform: translateX(2px);
}

.home-summary {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.summary-chip {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 72px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-subtle);
    color: var(--text-secondary);
    text-align: center;
    font-size: 0.84rem;
    line-height: 1.45;
}

.partner-rail {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.partner-slot {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 76px;
    padding: 16px;
    border: 1px dashed var(--border);
    border-radius: 12px;
    background: var(--bg-subtle);
    color: var(--text-muted);
    text-align: center;
    font-size: 0.82rem;
}

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

.home-info-card {
    min-width: 0;
}

.home-about-copy {
    color: var(--text-secondary);
    font-size: 0.94rem;
    line-height: 1.65;
}

.mini-footer-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.mini-footer-item {
    display: inline-flex;
    align-items: center;
    min-height: 32px;
    padding: 0 12px;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    background: var(--bg-subtle);
    color: var(--text-muted);
    font-size: 0.82rem;
}

.app-shell-article {
    max-width: 880px;
}

.card-hero {
    padding: 40px 32px;
}

.hero-lead {
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

.calculator-stack {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-note {
    color: var(--text-muted);
    font-size: 0.82rem;
    text-align: center;
    margin-top: 4px;
}

.result-summary {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: linear-gradient(180deg, rgba(197, 160, 89, 0.14), rgba(197, 160, 89, 0.06));
}

.result-summary-title {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text);
}

.result-summary-text {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.result-summary-note {
    margin-top: 10px;
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
}

.section-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.toc {
    padding-top: 28px;
    padding-bottom: 28px;
}

.toc-list {
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toc-list a {
    color: var(--text);
    text-decoration: none;
}

.toc-list a:hover {
    color: var(--accent);
}

.article-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.article-text {
    color: var(--text-secondary);
    line-height: 1.75;
}

.article-list {
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.formula-box {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 20px;
    border-radius: 12px;
    background-color: var(--bg);
    border: 1px solid var(--border-strong);
}

.formula-label {
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.formula-code {
    font-size: 1.05rem;
    color: var(--accent);
}

.table-wrap {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 640px;
}

.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    line-height: 1.6;
}

.data-table th {
    color: var(--text);
    font-weight: 600;
}

.data-table td {
    color: var(--text-secondary);
}

.faq-section {
    gap: 12px;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: 12px;
    background-color: var(--bg);
    padding: 18px 20px;
}

.faq-item summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text);
}

.faq-answer {
    margin-top: 12px;
    color: var(--text-muted);
    line-height: 1.7;
}

.calculator-disclaimer {
    color: var(--text-secondary);
    font-size: 0.84rem;
    line-height: 1.7;
    text-align: center;
    max-width: 760px;
    margin: -8px auto 0;
}

.calculator-disclaimer a {
    color: var(--accent);
    text-decoration: none;
}

.calculator-disclaimer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .app-shell-article {
        max-width: 560px;
    }

    .home-grid,
    .home-summary,
    .partner-rail,
    .home-info-grid {
        grid-template-columns: 1fr;
    }

    .card-hero {
        padding: 28px 24px;
    }

    .section-title {
        font-size: 1.15rem;
    }
}


.footer-links {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.footer-link {
    display: inline-flex;
    align-items: center;
    min-height: 32px;
    padding: 0 12px;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    background: var(--bg-subtle);
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.footer-link:hover {
    color: var(--accent);
    border-color: rgba(197, 160, 89, 0.45);
    background: var(--accent-soft);
}

.legal-meta {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.legal-stack {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.legal-section-body {
    color: var(--text-secondary);
    line-height: 1.75;
    font-size: 0.98rem;
}

.legal-section-body strong {
    color: var(--text);
}

.legal-section-body p + p,
.legal-section-body p + ul,
.legal-section-body p + ol,
.legal-section-body ul + p,
.legal-section-body ol + p,
.legal-section-body ul + ul,
.legal-section-body ol + ol,
.legal-section-body ul + ol,
.legal-section-body ol + ul {
    margin-top: 14px;
}

.legal-section-body ul,
.legal-section-body ol {
    padding-left: 22px;
}

.legal-section-body li + li {
    margin-top: 8px;
}

@media (max-width: 480px) {
    .footer-links {
        justify-content: center;
    }

    .home-grid,
    .home-summary,
    .partner-rail,
    .home-info-grid {
        grid-template-columns: 1fr;
    }

    .home-hero {
        padding: 16px 20px 14px;
    }
}