:root {
    color-scheme: dark;
    --bg: #020806;
    --panel: #06110d;
    --panel-soft: #081812;
    --line: rgba(84, 208, 163, 0.18);
    --line-soft: rgba(255,255,255,0.08);
    --text: #f4f7f5;
    --muted: #9dafaa;
    --green: #51e0ad;
    --green-soft: #8ef1cb;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background:
        radial-gradient(
            circle at 10% 8%,
            rgba(24, 102, 76, 0.13),
            transparent 30%
        ),
        var(--bg);
    color: var(--text);
    font-family:
        Inter,
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
}

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

.playbook-header {
    width: 100%;
    min-height: 78px;
    padding: 0 5vw;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--line-soft);
    background: rgba(2, 8, 6, 0.93);
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(14px);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-mark {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 11px;
    color: var(--green);
    background: #07150f;
    font-weight: 800;
}

.brand strong {
    display: block;
    letter-spacing: 0.18em;
    font-size: 0.92rem;
}

.brand small {
    display: block;
    margin-top: 3px;
    color: var(--muted);
    letter-spacing: 0.2em;
    font-size: 0.58rem;
}

.playbook-header nav {
    display: flex;
    align-items: center;
    gap: 24px;
    color: #bdc9c4;
    font-size: 0.9rem;
}

.nav-cta {
    padding: 11px 17px;
    border: 1px solid var(--line);
    border-radius: 10px;
    color: var(--text);
}

main {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.playbook-hero {
    padding: 110px 0 86px;
    max-width: 900px;
}

.eyebrow,
.section-heading > span,
.final-cta > span {
    display: inline-block;
    color: var(--green);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.16em;
}

.playbook-hero h1 {
    margin: 18px 0 22px;
    max-width: 850px;
    font-size: clamp(3rem, 7vw, 6.2rem);
    line-height: 0.98;
    letter-spacing: -0.055em;
}

.playbook-hero > p {
    max-width: 720px;
    color: var(--muted);
    font-size: 1.1rem;
    line-height: 1.75;
}

.principle {
    display: inline-block;
    margin-top: 28px;
    padding: 13px 16px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: rgba(12, 34, 25, 0.55);
    color: var(--green-soft);
    font-weight: 650;
}

.reading-path {
    padding: 80px 0;
    border-top: 1px solid var(--line-soft);
}

.section-heading {
    max-width: 700px;
    margin-bottom: 38px;
}

.section-heading h2 {
    margin: 13px 0;
    font-size: clamp(2rem, 4vw, 3.5rem);
    letter-spacing: -0.04em;
}

.section-heading p {
    color: var(--muted);
    line-height: 1.65;
}

.playbook-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

.playbook-card {
    min-height: 245px;
    padding: 24px;
    display: flex;
    gap: 18px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background:
        linear-gradient(
            145deg,
            rgba(8, 29, 21, 0.92),
            rgba(3, 13, 10, 0.97)
        );
}

.number {
    color: var(--green);
    font-size: 0.72rem;
    font-weight: 800;
}

.tag {
    color: var(--green);
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.12em;
}

.playbook-card h3 {
    margin: 10px 0 14px;
    font-size: 1.35rem;
    line-height: 1.2;
}

.playbook-card p {
    margin: 0;
    color: var(--muted);
    line-height: 1.65;
    font-size: 0.92rem;
}

.playbook-content {
    padding: 80px 0;
    border-top: 1px solid var(--line-soft);
}

details {
    border-top: 1px solid var(--line-soft);
}

details:last-child {
    border-bottom: 1px solid var(--line-soft);
}

summary {
    padding: 24px 6px;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 1.08rem;
    font-weight: 700;
}

summary::-webkit-details-marker {
    display: none;
}

summary span {
    color: var(--green);
    font-size: 0.72rem;
}

.detail-body {
    padding: 0 6px 32px 48px;
    max-width: 930px;
    color: var(--muted);
    line-height: 1.75;
}

.detail-body h4 {
    color: var(--text);
    margin-bottom: 8px;
}

.two-column,
.model {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin: 24px 0;
}

.two-column > div,
.model > div {
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: 13px;
    background: var(--panel);
}

.model strong {
    color: var(--green-soft);
}

.callout {
    margin: 22px 0;
    padding: 17px 19px;
    border-left: 3px solid var(--green);
    background: var(--panel-soft);
    color: var(--text);
    font-weight: 650;
}

.callout.danger {
    border-left-color: #c7a56b;
}

.market-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    margin: 24px 0;
    border: 1px solid var(--line);
    border-radius: 12px;
    overflow: hidden;
}

.market-row span {
    padding: 18px;
    text-align: center;
    border-right: 1px solid var(--line);
    color: var(--green-soft);
    font-weight: 800;
    font-size: 0.76rem;
    letter-spacing: 0.08em;
}

.market-row span:last-child {
    border-right: 0;
}

.detail-actions {
    display: flex;
    gap: 10px;
    margin-top: 24px;
}

.detail-actions a,
.final-cta a {
    padding: 12px 17px;
    border-radius: 10px;
    border: 1px solid var(--line);
    font-weight: 700;
}

.final-cta {
    margin: 50px 0 90px;
    padding: 54px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background:
        radial-gradient(
            circle at 10% 0%,
            rgba(36, 125, 94, 0.14),
            transparent 35%
        ),
        linear-gradient(
            145deg,
            #07140f,
            #030b08
        );
}

.final-cta h2 {
    max-width: 720px;
    margin: 14px 0 26px;
    font-size: clamp(2rem, 4vw, 3.7rem);
    line-height: 1.06;
    letter-spacing: -0.045em;
}

.final-cta > div {
    display: flex;
    gap: 10px;
}

.final-cta .primary {
    background: var(--green);
    color: #03110b;
    border-color: transparent;
}

footer {
    padding: 28px 5vw;
    display: flex;
    justify-content: space-between;
    gap: 24px;
    border-top: 1px solid var(--line-soft);
    color: #82948d;
    font-size: 0.78rem;
}

@media (max-width: 900px) {
    .playbook-grid {
        grid-template-columns: 1fr 1fr;
    }

    .playbook-header nav a:not(.nav-cta) {
        display: none;
    }
}

@media (max-width: 620px) {
    main {
        width: min(100% - 28px, 1180px);
    }

    .playbook-header {
        padding: 0 18px;
    }

    .playbook-hero {
        padding: 74px 0 60px;
    }

    .playbook-grid,
    .two-column,
    .model,
    .market-row {
        grid-template-columns: 1fr;
    }

    .market-row span {
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .market-row span:last-child {
        border-bottom: 0;
    }

    .detail-body {
        padding-left: 0;
    }

    .final-cta {
        padding: 32px 24px;
    }

    footer {
        flex-direction: column;
    }
}

/* ==========================================================
   TEEWAI SME PLAYBOOKS — HERO VIEWPORT POLISH REV2
   Desktop only. Uses certified production selectors.
   ========================================================== */

@media (min-width: 769px) {
    .playbook-hero {
        padding-top: 72px;
        padding-bottom: 68px;
        max-width: 1080px;
    }

    .playbook-hero h1 {
        font-size: clamp(3.9rem, 5.7vw, 6.25rem);
        line-height: 1;
        letter-spacing: -0.05em;
        max-width: 1080px;
    }

    .playbook-hero > p {
        max-width: 960px;
        font-size: 1.16rem;
        line-height: 1.7;
    }
}