/* 
 * v2_executive_theme - Layout
 * Style: McKinsey/Pentagram Think Tank
 * Core: Asymmetric two-column grid throughout. Warm newsprint header. 
 */

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ─── Header: Clean Masthead ─── */
/* McKinsey / think tank: warm newsprint header, precise hairline, no glass */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.1rem 0;
    background-color: rgba(247, 246, 242, 0.97);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo: mono wordmark — think tank masthead style */
.logo {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: var(--fw-regular);
    color: var(--color-text-main);
    letter-spacing: 0.22em;
    text-transform: uppercase;
}

.logo span {
    color: var(--color-gold);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: var(--fw-regular);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-text-subtle);
    transition: color var(--transition-smooth);
    position: relative;
}

.nav-links a:hover {
    color: var(--color-text-main);
}

/* Active: rule underline — not a color pop */
.nav-links a.active {
    color: var(--color-text-main);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--color-text-main);
}

/* ─── Sections: Generous White Paper Rhythm ─── */
.section {
    padding: var(--spacing-section) 0;
}

/* ─── Section Header: Asymmetric Two-Column ─── */
/* Left (narrow): mono chapter label
   Right (wide): display serif headline + prose description */
.section-header {
    display: grid;
    grid-template-columns: var(--col-label) 1fr;
    gap: 0 var(--col-gap);
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    align-items: start;
}

/* The .label span goes in column 1 */
.section-header .label {
    padding-top: 8px;  /* Align baseline with h2 cap height */
}

/* h2 and p both sit in column 2 */
.section-header h2 {
    grid-column: 2;
    margin-bottom: 0.75rem;
}

.section-header p {
    grid-column: 2;
    font-size: 1rem;
    line-height: 1.75;
    margin-bottom: 0;
    max-width: 62ch;
}

/* ─── Footer ─── */
.site-footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
    text-align: left;
    background-color: var(--color-bg-main);
}

.site-footer p {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-text-subtle);
    max-width: none;
    margin: 0;
}

/* ═══════════════════════════════════════════════
   TABLET RESPONSIVE  (769px – 1024px)
   ═══════════════════════════════════════════════ */
@media (min-width: 769px) and (max-width: 1024px) {
    :root {
        --col-label: 140px;
        --col-gap:   2rem;
    }
}

/* ═══════════════════════════════════════════════
   MOBILE RWD  (≤ 768px)
   ═══════════════════════════════════════════════ */
@media (max-width: 768px) {

    /* ─── Container: disciplined horizontal padding (px-6 equivalent) ─── */
    .container {
        padding: 0 1.5rem;  /* 24px — generous but disciplined */
    }

    /* ─── Header: Logo-left + Contact-only on right ─── */
    /* No hamburger. No drawer. No glassmorphism. Pure text. */
    .site-header {
        padding: 0.85rem 0;
    }

    .site-header .container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 0;
    }

    /* Hide ALL nav links except the last one (Contact) on mobile */
    .nav-links a:not(:last-child) {
        display: none;
    }

    .nav-links {
        gap: 0;
    }

    /* The sole remaining Contact link: styled as a minimal text CTA */
    .nav-links a:last-child {
        font-family: var(--font-mono);
        font-size: 0.6rem;
        letter-spacing: 0.14em;
        text-transform: uppercase;
        color: var(--color-text-main);
        border: 1px solid var(--color-border-strong);
        padding: 5px 12px;
        transition: border-color var(--transition-smooth), color var(--transition-smooth);
    }

    .nav-links a:last-child:hover {
        border-color: var(--color-text-main);
    }

    /* ─── Fluid Typography ─── */
    /* Clamp headlines to 28px–32px to avoid awkward single-word wrapping */
    h1 {
        font-size: clamp(1.75rem, 7.5vw, 2.05rem);  /* 28–33px */
        letter-spacing: -0.02em;
        line-height: 1.1;
    }

    h2 {
        font-size: clamp(1.4rem, 5.5vw, 1.75rem);   /* 22.4–28px */
        letter-spacing: -0.015em;
        line-height: 1.15;
    }

    /* ─── Section Header: Natural Vertical Stack ─── */
    /* Chapter label sits cleanly at top, followed by h2 and p */
    .section-header {
        display: flex;
        flex-direction: column;
        gap: 0;
        padding-top: 1.25rem;
        margin-bottom: 2rem;
    }

    .section-header .label {
        padding-top: 0;
        margin-bottom: 0.5rem;
    }

    .section-header h2 {
        grid-column: 1;
        margin-bottom: 0.6rem;
    }

    .section-header p {
        grid-column: 1;
        font-size: 0.9rem;
        line-height: 1.75;
        max-width: none;
    }

    /* ─── Sections: compressed vertical rhythm (py-12 to py-16 equivalent) ─── */
    .section {
        padding: var(--spacing-section) 0;
    }

    /* ─── Footer: compact mono style ─── */
    .site-footer {
        padding: 2rem 0;
    }
}

/* ═══════════════════════════════════════════════
   EXTRA SMALL MOBILE  (≤ 375px)
   ═══════════════════════════════════════════════ */
@media (max-width: 375px) {
    .container {
        padding: 0 1rem;  /* 16px */
    }

    h1 {
        font-size: 1.75rem;  /* 28px floor */
    }

    h2 {
        font-size: 1.35rem;
    }
}