/* ============================================================
   QuantCalc UI v2 — landing page (index.html only).
   Loaded AFTER tokens.css + main.css; overrides app-shell rules
   (main.css is shared — never move rules out of it for this page).
   Identity: precision instrument. Light-only this phase.
   Hairline rules, 2-4px radii, restrained accent, editorial.
   ============================================================ */

/* ---- page shell (override main.css app-shell body) ---- */
html, body {
    height: auto;
}

body {
    display: block;
    min-height: auto;
    font-size: 16px;
    line-height: 1.6;
    color: var(--ink);
    background: var(--surface-card);
    overflow-x: hidden;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: var(--accent-ink);
    padding: 0.75rem 1.5rem;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    z-index: 9999;
    font-weight: 600;
    text-decoration: none;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 0;
}

/* ---- slim top nav ---- */
.site-nav {
    border-bottom: 1px solid var(--border);
    background: var(--surface-card);
}

.site-nav-inner {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0.7rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -0.01em;
    color: var(--ink);
    text-decoration: none;
}

.brand img {
    display: block;
    border-radius: var(--radius-sm);
}

.site-nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.site-nav-links a {
    color: var(--ink-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
}

.site-nav-links a:hover {
    color: var(--ink);
}

.site-nav-links a.nav-cta {
    color: var(--accent);
    font-weight: 600;
}

.site-nav-links a.nav-cta:hover {
    color: var(--accent-hover);
}

/* ---- hero ---- */
.hero {
    background: var(--surface-page);
    border-bottom: 1px solid var(--border);
    padding: 4.5rem 1.5rem 0;
    text-align: center;
}

.hero-content {
    max-width: 1160px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2.1rem, 4.6vw, 3.25rem);
    font-weight: 700;
    letter-spacing: -0.022em;
    line-height: 1.12;
    color: var(--ink);
    max-width: 820px;
    margin: 0 auto 1.25rem;
}

.hero .subtitle {
    font-size: 1.22rem;
    line-height: 1.55;
    color: var(--ink-muted);
    max-width: 640px;
    margin: 0 auto 0.6rem;
}

.highlight {
    color: var(--accent);
    font-weight: 600;
}

.hero .hero-tagline {
    font-size: 0.92rem;
    color: var(--ink-faint);
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.78rem 1.7rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background-color var(--duration-fast) var(--easing-default),
                border-color var(--duration-fast) var(--easing-default),
                color var(--duration-fast) var(--easing-default);
}

.btn-primary {
    background: var(--accent);
    color: var(--accent-ink);
    border: 1px solid var(--accent);
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.link-quiet {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    border-bottom: 1px solid transparent;
}

.link-quiet:hover {
    border-bottom-color: var(--accent);
}

/* trust pills -> quiet hairline-separated meta row */
.trust-pills {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 2rem;
    row-gap: 0.4rem;
}

.trust-pill {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--ink-faint);
    white-space: nowrap;
    padding: 0 1rem;
    border-left: 1px solid var(--border-strong);
}

.trust-pill:first-child {
    border-left: none;
}

.hero-frame {
    display: block;
    max-width: 1100px;
    margin: 3rem auto 0;
    transform: translateY(1px); /* sit on the section's hairline */
}

.hero-frame img {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid var(--border-strong);
    border-bottom: none;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    box-shadow: 0 1px 2px rgba(19, 26, 34, 0.05),
                0 16px 40px -12px rgba(19, 26, 34, 0.18);
}

/* ---- trust strip (promoted) ---- */
.trust {
    background: var(--surface-card);
    border-bottom: 1px solid var(--border);
    padding: 1.4rem 1.5rem;
    text-align: center;
}

.trust-items {
    display: flex;
    justify-content: center;
    gap: 2.75rem;
    flex-wrap: wrap;
    max-width: 1000px;
    margin: 0 auto;
}

.trust-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--ink-muted);
}

.trust-item svg {
    flex: none;
    stroke: var(--ok);
}

.trust-note {
    margin: 0.9rem auto 0;
    font-size: 0.83rem;
    color: var(--ink-faint);
    max-width: 720px;
}

.trust-note a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

.trust-note a:hover {
    text-decoration: underline;
}

/* ---- shared section rhythm ---- */
.features,
.capabilities,
.audience,
.deliverables,
.pricing,
.faq-section {
    padding: 4.5rem 1.5rem;
}

.features h2,
.capabilities h2,
.audience h2,
.deliverables h2,
.pricing h2,
.faq-section h2 {
    text-align: center;
    font-size: 1.9rem;
    font-weight: 700;
    letter-spacing: -0.015em;
    color: var(--ink);
    margin-bottom: 0.6rem;
}

.section-subtitle {
    text-align: center;
    color: var(--ink-muted);
    font-size: 1.02rem;
    margin-bottom: 3rem;
}

/* ---- features ---- */
.features {
    max-width: 1160px;
    margin: 0 auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.25rem;
}

.feature-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1.6rem 1.5rem;
}

.feature-icon {
    color: var(--accent);
    margin-bottom: 0.9rem;
}

.feature-icon svg {
    display: block;
    width: 22px;
    height: 22px;
}

.feature-card h3 {
    font-size: 1.02rem;
    font-weight: 650;
    letter-spacing: -0.005em;
    color: var(--ink);
    margin-bottom: 0.45rem;
}

.feature-card p {
    font-size: 0.92rem;
    color: var(--ink-muted);
    line-height: 1.65;
}

/* ---- chart evidence band (real app output) ---- */
.chart-band {
    background: var(--surface-page);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 3rem 1.5rem;
}

.chart-band-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
    justify-items: center;
}

@media (min-width: 860px) {
    .chart-band-inner {
        grid-template-columns: 3fr 1fr;
        align-items: start;
    }
}

.chart-band figure {
    margin: 0;
    width: 100%;
}

/* Below the 2-col breakpoint, don't upscale the small allocation crop
   past its natural width — it goes soft. */
@media (max-width: 859px) {
    .chart-band figure:last-child {
        max-width: 440px;
    }
}

.chart-band img {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: 0 1px 2px rgba(19, 26, 34, 0.04),
                0 8px 24px -10px rgba(19, 26, 34, 0.12);
    background: var(--surface-card);
}

/* ---- capabilities: editorial stat tiles ---- */
.capabilities {
    background: var(--surface-card);
}

.capabilities-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem 2.5rem;
}

.capability-item {
    border-top: 1px solid var(--border-strong);
    padding-top: 1.1rem;
    text-align: left;
}

.capability-number {
    font-size: 2.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--accent);
    line-height: 1.1;
    font-variant-numeric: tabular-nums lining-nums;
}

.capability-label {
    font-size: 0.76rem;
    font-weight: 650;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--ink);
    margin: 0.35rem 0 0.55rem;
}

.capability-item p {
    font-size: 0.89rem;
    color: var(--ink-muted);
    line-height: 1.6;
    margin: 0;
}

.capability-summary {
    max-width: 1000px;
    margin: 2.75rem auto 0;
    background: var(--accent-surface);
    border-left: 2px solid var(--accent);
    border-radius: var(--radius-sm);
    padding: 1.1rem 1.3rem;
}

.capability-summary p {
    font-size: 0.93rem;
    color: var(--ink-muted);
    line-height: 1.7;
    margin: 0;
}

/* ---- who this is for ---- */
.audience {
    background: var(--surface-page);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.audience h2 {
    margin-bottom: 2rem;
}

.audience-list-wrap {
    max-width: 660px;
    margin: 0 auto;
}

.audience ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.audience li {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    font-size: 1.02rem;
    color: var(--ink);
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border);
}

.audience li:last-child {
    border-bottom: none;
}

.audience .li-marker {
    color: var(--accent);
    font-size: 1rem;
    flex: none;
}

/* ---- deliverables ("see exactly what you get") ---- */
.deliverables-grid {
    max-width: 960px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
}

.deliverable-card {
    display: block;
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1.6rem 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: border-color var(--duration-fast) var(--easing-default);
}

.deliverable-card:hover {
    border-color: var(--border-strong);
}

.deliverable-card h3 {
    font-size: 1rem;
    font-weight: 650;
    color: var(--ink);
    margin-bottom: 0.45rem;
}

.deliverable-card p {
    font-size: 0.875rem;
    color: var(--ink-muted);
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.deliverable-card .card-link {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.875rem;
}

.deliverables-footnote {
    text-align: center;
    margin-top: 1.75rem;
    color: var(--ink-faint);
    font-size: 0.85rem;
}

.deliverables-footnote a {
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
}

.deliverables-footnote a:hover {
    text-decoration: underline;
}

/* ---- pricing ---- */
.pricing {
    background: var(--surface-page);
    border-top: 1px solid var(--border);
    text-align: center;
}

.pricing-note {
    color: var(--ink-muted);
    font-size: 0.95rem;
    margin: -2rem 0 2.5rem;
}

.pricing-note strong {
    color: var(--accent);
}

.pricing-cards {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 1.25rem;
    flex-wrap: wrap;
    max-width: 1160px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.9rem 1.7rem;
    width: 330px;
    text-align: left;
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card.featured {
    border-color: var(--accent);
    box-shadow: 0 1px 2px rgba(19, 26, 34, 0.04),
                0 12px 32px -12px rgba(30, 86, 200, 0.25);
}

.pricing-badge {
    position: absolute;
    top: -11px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: var(--accent-ink);
    padding: 0.2rem 0.8rem;
    border-radius: 3px;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    white-space: nowrap;
}

.pricing-card h3 {
    font-size: 1.15rem;
    font-weight: 650;
    color: var(--ink);
    margin-bottom: 0.4rem;
}

.pricing-card .price {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--ink);
    font-variant-numeric: tabular-nums lining-nums;
}

.pricing-card .price > span {
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 0;
    color: var(--ink-faint);
}

.pricing-card .price .price-was {
    text-decoration: line-through;
    color: var(--ink-faint);
    font-size: 0.55em;
    font-weight: 500;
    vertical-align: middle;
}

.pricing-card ul {
    list-style: none;
    padding: 0;
    margin: 1.25rem 0 1.5rem;
    flex-grow: 1;
}

.pricing-card li {
    padding: 0.5rem 0 0.5rem 1.4rem;
    color: var(--ink-muted);
    font-size: 0.92rem;
    line-height: 1.5;
    position: relative;
    border-bottom: 1px solid var(--border);
}

.pricing-card li:last-child {
    border-bottom: none;
}

.pricing-card li::before {
    content: '\2713';
    font-weight: 700;
    color: var(--ok);
    position: absolute;
    left: 0;
    top: 0.5rem;
}

.pricing-card li a,
.pricing-fineprint a,
.pricing-meta a {
    color: var(--accent);
}

.pricing-fineprint {
    font-size: 0.74rem;
    color: var(--ink-muted);
    margin-bottom: var(--space-2, 8px);
    text-align: center;
    line-height: 1.55;
    padding: 6px 8px;
    background: var(--surface-page);
    border-radius: var(--radius-sm);
}

.pricing-card .btn {
    width: 100%;
}

.btn-outline {
    background: var(--surface-card);
    color: var(--ink-muted);
    border: 1px solid var(--border-strong);
}

.btn-outline:hover {
    color: var(--ink);
    border-color: var(--ink-muted);
}

.pricing-meta {
    font-size: var(--text-xs, 0.75rem);
    color: var(--ink-faint);
    margin-top: var(--space-2, 8px);
    text-align: center;
}

/* ---- research section ---- */
.research {
    background: var(--surface-card);
    padding: 4.5rem 1.5rem;
}

.research h2 {
    text-align: center;
    font-size: 1.9rem;
    font-weight: 700;
    letter-spacing: -0.015em;
    color: var(--ink);
    margin-bottom: 2.5rem;
}

.research-inner {
    max-width: 960px;
    margin: 0 auto;
}

.research-banner {
    background: var(--surface-page);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1.9rem 2rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.research-banner .research-lede {
    font-size: 1.05rem;
    color: var(--ink);
    margin-bottom: 0.8rem;
    line-height: 1.7;
}

.research-banner .research-body {
    font-size: 0.95rem;
    color: var(--ink-muted);
    margin-bottom: 1.2rem;
    line-height: 1.7;
}

.research-banner .research-disclaimer {
    font-size: 0.82rem;
    color: var(--ink-faint);
    line-height: 1.6;
    font-style: italic;
    max-width: 700px;
    margin: 0 auto;
}

.research-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

@media (min-width: 640px) {
    .research-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.research-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1.5rem 1.4rem;
}

.research-card h3 {
    font-size: 1rem;
    font-weight: 650;
    color: var(--ink);
    margin-bottom: 0.5rem;
}

.research-card p {
    font-size: 0.875rem;
    color: var(--ink-muted);
    line-height: 1.6;
    margin-bottom: 0.85rem;
}

.research-card a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
}

.research-card a:hover {
    text-decoration: underline;
}

/* ---- FAQ: editorial accordion ---- */
.faq-section {
    background: var(--surface-page);
    border-top: 1px solid var(--border);
}

.faq-inner {
    max-width: 780px;
    margin: 0 auto;
}

.faq-section h2 {
    margin-bottom: 2rem;
}

.faq-section details {
    border-bottom: 1px solid var(--border);
    padding: 0.35rem 0;
}

.faq-section details:first-of-type {
    border-top: 1px solid var(--border);
}

.faq-section summary {
    font-weight: 600;
    font-size: 1rem;
    color: var(--ink);
    cursor: pointer;
    padding: 0.8rem 0;
    list-style: none;
    position: relative;
    padding-right: 2rem;
}

.faq-section summary::-webkit-details-marker {
    display: none;
}

.faq-section summary::after {
    content: '+';
    position: absolute;
    right: 0.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--ink-faint);
    font-weight: 400;
    font-size: 1.25rem;
    line-height: 1;
}

.faq-section details[open] summary::after {
    content: '\2212';
}

.faq-section details p {
    color: var(--ink-muted);
    line-height: 1.7;
    font-size: 0.95rem;
    margin: 0 0 1rem;
}

.faq-section details a {
    color: var(--accent);
}

/* ---- built-by line + footer ---- */
.built-by {
    text-align: center;
    color: var(--ink-faint);
    font-size: 0.85rem;
    padding: 1.5rem 1rem 0;
    max-width: 600px;
    margin: 0 auto;
    background: transparent;
}

footer {
    /* Consistent with the app's legal footer (theme-stable inverted). */
    background: #1f2937;
    color: #9ca3af;
    padding: 2.5rem 1.5rem;
    text-align: center;
    margin-top: 1.5rem;
}

footer nav {
    margin-bottom: 1.25rem;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.4rem 1.6rem;
}

footer a {
    color: #9ca3af;
    text-decoration: none;
    font-size: 0.85rem;
    transition: color var(--duration-fast) var(--easing-default);
}

footer a:hover {
    color: #ffffff;
}

footer .disclaimer {
    font-size: 0.75rem;
    line-height: 1.7;
    color: #6b7280;
    max-width: 800px;
    margin: 0 auto;
}

/* ---- responsive ---- */
@media (max-width: 900px) {
    .capabilities-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .site-nav-links {
        gap: 1rem;
    }

    .site-nav-links a {
        font-size: 0.84rem;
    }

    .hero {
        padding-top: 3rem;
    }

    .hero .subtitle {
        font-size: 1.08rem;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .trust-pills {
        margin-top: 1.5rem;
    }

    .trust-pill {
        font-size: 0.74rem;
        padding: 0 0.7rem;
    }

    .trust-items {
        gap: 0.9rem 1.75rem;
    }

    .hero-frame {
        margin-top: 2rem;
    }

    .features,
    .capabilities,
    .audience,
    .deliverables,
    .pricing,
    .faq-section,
    .research {
        padding-top: 3.25rem;
        padding-bottom: 3.25rem;
    }

    .features h2,
    .capabilities h2,
    .audience h2,
    .deliverables h2,
    .pricing h2,
    .research h2,
    .faq-section h2 {
        font-size: 1.55rem;
    }

    .pricing-note {
        margin-top: -1.5rem;
    }

    .pricing-cards {
        flex-direction: column;
        align-items: center;
    }

    .pricing-card {
        width: 100%;
        max-width: 420px;
    }
}

@media (max-width: 560px) {
    .capabilities-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .site-nav-links a:not(.nav-cta) {
        display: none;
    }

    .trust-pill {
        border-left: none;
        padding: 0 0.5rem;
    }
}