/* Product v1.1: proof, beta and responsive layers. */
.pain-question {
    display: inline-flex;
    margin: 0 0 18px;
    padding: 9px 13px;
    border: 1px solid rgba(49, 130, 246, 0.16);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.72);
    color: var(--blue-deep);
    font-size: 13px;
    font-weight: 700;
}

.beta-status {
    display: flex;
    max-width: 560px;
    align-items: center;
    gap: 10px;
    margin-top: 24px;
}

.beta-status > span,
.filter-label,
.sample-kicker,
.evidence-type {
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.1em;
}

.beta-status > span {
    padding: 6px 9px;
    border-radius: 999px;
    background: var(--teal-soft);
    color: var(--teal-deep);
}

.beta-status p {
    margin: 0;
    color: var(--ink-soft);
    font-size: 13px;
}

.beta-microcopy,
.hero-risk {
    max-width: 620px;
    margin: 14px 0 0;
    color: var(--ink-faint);
    font-size: 12px;
}

.hero-risk {
    margin-top: 7px;
}

.quick-start {
    padding: 32px 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: var(--paper);
}

.quick-start-heading {
    margin-bottom: 22px;
}

.quick-start-heading .eyebrow {
    margin-bottom: 8px;
}

.quick-start-heading h2 {
    margin: 0;
    font-size: 22px;
    letter-spacing: -0.02em;
}

.quick-steps {
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.quick-steps li {
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 13px;
    align-items: center;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--cloud);
}

.quick-steps li > span {
    display: grid;
    width: 38px;
    height: 38px;
    place-items: center;
    border-radius: 12px;
    background: var(--paper);
    color: var(--blue-deep);
    font-size: 11px;
    font-weight: 800;
}

.quick-steps strong {
    font-size: 14px;
}

.quick-steps p {
    margin: 3px 0 0;
    color: var(--ink-faint);
    font-size: 12px;
}

.upstream-section {
    background: linear-gradient(180deg, #f7faff, var(--paper));
}

.upstream-layout {
    display: grid;
    gap: 32px;
    align-items: center;
}

.upstream-layout .section-heading {
    margin-bottom: 0;
}

.cause-chain {
    display: grid;
    gap: 8px;
    padding: 24px;
    border: 1px solid rgba(49, 130, 246, 0.15);
    border-radius: var(--radius-lg);
    background: var(--paper);
    box-shadow: var(--shadow-card);
}

.cause-chain span,
.cause-chain strong {
    padding: 13px 15px;
    border-radius: 13px;
    background: var(--cloud);
    font-size: 13px;
    text-align: center;
}

.cause-chain strong {
    background: var(--blue);
    color: #fff;
}

.cause-chain i {
    color: var(--blue);
    font-style: normal;
    text-align: center;
}

.relevance-panel {
    display: grid;
    gap: 20px;
    margin-top: 22px;
    padding: 26px;
    border: 1px solid rgba(0, 180, 147, 0.2);
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--teal-soft), #fff 72%);
}

.filter-label {
    color: var(--teal-deep);
}

.relevance-panel h3 {
    margin: 9px 0 8px;
    font-size: 20px;
    letter-spacing: -0.02em;
}

.relevance-panel p,
.route-note {
    margin: 0;
    color: var(--ink-soft);
    font-size: 13px;
    line-height: 1.75;
}

.route-note {
    padding: 16px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.82);
    color: var(--ink);
    font-weight: 650;
}

.alternate-routes {
    display: grid;
    gap: 10px;
    margin-top: 12px;
}

.alternate-routes article {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--paper);
}

.alternate-routes span {
    color: var(--blue-deep);
    font-size: 12px;
    font-weight: 800;
}

.alternate-routes p {
    margin: 6px 0 0;
    color: var(--ink-soft);
    font-size: 12.5px;
}

.sample-heading {
    max-width: 760px;
}

.sample-card {
    overflow: hidden;
    border: 1px solid rgba(16, 24, 40, 0.08);
    border-radius: var(--radius-lg);
    background: var(--paper);
    box-shadow: var(--shadow-lift);
}

.sample-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    padding: 26px;
    border-bottom: 1px solid var(--line);
}

.sample-kicker {
    color: var(--ink-faint);
}

.sample-card-header h3 {
    margin: 7px 0 0;
    font-size: clamp(20px, 4vw, 28px);
    letter-spacing: -0.025em;
}

.sample-card .output-status {
    flex: none;
    padding: 7px 10px;
    border-radius: 999px;
    background: var(--teal-soft);
    color: var(--teal-deep);
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.sample-judgment {
    padding: 26px;
    background: linear-gradient(135deg, var(--blue-wash), #fff 72%);
}

.sample-judgment > span {
    color: var(--blue-deep);
    font-size: 11px;
    font-weight: 800;
}

.sample-judgment h4 {
    max-width: 840px;
    margin: 9px 0 8px;
    font-size: clamp(18px, 4vw, 24px);
    line-height: 1.45;
}

.sample-judgment p {
    max-width: 820px;
    margin: 0;
    color: var(--ink-soft);
    font-size: 13px;
    line-height: 1.75;
}

.evidence-grid {
    display: grid;
    gap: 1px;
    background: var(--line);
}

.evidence-block {
    padding: 24px;
    background: var(--paper);
}

.evidence-type {
    color: var(--blue-deep);
}

.inference-block .evidence-type {
    color: var(--teal-deep);
}

.unknown-block .evidence-type,
.watch-block .evidence-type {
    color: #7357b8;
}

.evidence-block h4 {
    margin: 8px 0 10px;
    font-size: 16px;
    letter-spacing: -0.015em;
}

.evidence-block p,
.evidence-block li {
    color: var(--ink-soft);
    font-size: 13px;
    line-height: 1.75;
}

.evidence-block p {
    margin: 0;
}

.evidence-block ul {
    display: grid;
    gap: 8px;
    margin: 0;
    padding-left: 18px;
}

.sample-footer {
    display: grid;
    gap: 15px;
    padding: 22px 26px;
    background: #f9fafc;
}

.source-list {
    display: flex;
    gap: 8px 14px;
    flex-wrap: wrap;
    align-items: center;
}

.source-list strong {
    color: var(--ink-faint);
    font-size: 11px;
}

.source-list a {
    color: var(--blue-deep);
    font-size: 12px;
    font-weight: 700;
    text-decoration: none;
}

.source-list a:hover {
    text-decoration: underline;
}

.sample-footer p {
    margin: 0;
    color: var(--ink-faint);
    font-size: 11px;
    line-height: 1.7;
}

.sample-action {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    margin-top: 24px;
    padding: 18px 20px;
    border-radius: 18px;
    background: var(--paper);
}

.sample-action p {
    margin: 0;
    color: var(--ink-soft);
    font-size: 14px;
    font-weight: 650;
}

.faq-section {
    background: var(--paper);
}

.faq-layout {
    display: grid;
    gap: 28px;
}

.faq-layout .section-heading {
    margin-bottom: 0;
}

.faq-list {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--paper);
}

.faq-list details {
    border-bottom: 1px solid var(--line);
}

.faq-list details:last-child {
    border-bottom: 0;
}

.faq-list summary {
    position: relative;
    padding: 20px 52px 20px 20px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 750;
    list-style: none;
}

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

.faq-list summary::after {
    position: absolute;
    top: 18px;
    right: 20px;
    color: var(--blue);
    content: "+";
    font-size: 21px;
}

.faq-list details[open] summary::after {
    content: "−";
}

.faq-list details p {
    margin: -6px 0 0;
    padding: 0 52px 20px 20px;
    color: var(--ink-soft);
    font-size: 13px;
    line-height: 1.75;
}

.beta-card-copy p {
    margin: 0 0 10px;
    color: #a9b5c7;
    font-size: 13.5px;
    line-height: 1.75;
}

.beta-card-copy .primary-action {
    margin-top: 14px;
}

@media (min-width: 640px) {
    .shell {
        width: min(calc(100% - 56px), var(--shell));
    }

    .quick-steps,
    .alternate-routes {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .context-grid,
    .trust-grid,
    .evidence-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .comparison-row {
        grid-template-columns: minmax(150px, 0.72fr) minmax(0, 1fr) minmax(0, 1fr);
        gap: 26px;
        align-items: center;
        padding: 19px 26px;
    }

    .comparison-head {
        display: grid;
    }

    .advanced-card,
    .optional-context,
    .footer-layout,
    .relevance-panel {
        grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
        align-items: center;
    }

    .footer-links {
        justify-content: flex-end;
    }
}

@media (min-width: 900px) {
    .product-hero {
        min-height: 780px;
        padding: 150px 0 96px;
    }

    .hero-layout {
        grid-template-columns: minmax(0, 1.04fr) minmax(410px, 0.72fr);
        gap: 72px;
        align-items: center;
    }

    .hero-map {
        padding: 26px;
    }

    .quick-start > .shell {
        display: grid;
        grid-template-columns: minmax(190px, 0.34fr) minmax(0, 1fr);
        gap: 40px;
        align-items: center;
    }

    .quick-start-heading {
        margin-bottom: 0;
    }

    .product-section {
        padding: 112px 0;
    }

    .upstream-layout,
    .faq-layout {
        grid-template-columns: minmax(0, 0.8fr) minmax(460px, 1fr);
        gap: 78px;
    }

    .context-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .method-layout {
        grid-template-columns: minmax(0, 0.82fr) minmax(500px, 1fr);
        gap: 84px;
        align-items: center;
    }

    .trust-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .advanced-card {
        grid-template-columns: minmax(0, 0.8fr) minmax(420px, 1fr);
        gap: 70px;
        padding: 48px 54px;
    }

    .final-card {
        padding: 64px 40px;
    }

    .product-footer {
        padding-bottom: 48px;
    }

    .mobile-start {
        display: none;
    }
}

@media (max-width: 639px) {
    .product-nav {
        min-height: 62px;
    }

    .nav-links a:not([aria-current="page"]) {
        display: none;
    }

    .nav-links a {
        padding-right: 0;
        background: transparent;
        color: var(--ink-soft);
    }

    .product-hero {
        padding: 112px 0 72px;
    }

    .hero-copy h1 {
        font-size: 38px;
    }

    .hero-actions > a,
    .sample-action > a {
        width: 100%;
    }

    .sample-card-header,
    .sample-action {
        align-items: stretch;
        flex-direction: column;
    }

    .sample-card .output-status {
        align-self: flex-start;
    }

    .context-card {
        min-height: 205px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    [data-reveal] {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .primary-action,
    .secondary-action,
    .context-card,
    .trust-card,
    .method-list li,
    .signal-path li {
        transition: none;
    }
}