/* =====================================================
   Ekantik 10x — Layout (spec §9.3, §9.5)
   Single-column, mobile-first, 640–720 content width.
   ===================================================== */

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: var(--fs-body);
    line-height: 1.6;
    color: var(--ink);
    background: var(--cream);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ─── Nav + trust strip ─── */
.nav {
    position: sticky; top: 0; z-index: 50;
    background: var(--navy);
    color: var(--white);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav__inner {
    max-width: var(--max-wide);
    margin: 0 auto;
    padding: 14px var(--s-2);
    display: flex; align-items: center; justify-content: space-between;
}
.nav__brand {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 18px;
    color: var(--gold);
    text-decoration: none;
    letter-spacing: 0.01em;
}
.nav__brand-sub {
    display: inline-block; margin-left: 8px;
    font-family: var(--font-sans);
    font-size: 10px;
    color: rgba(255,255,255,0.5);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    vertical-align: middle;
}
.nav__links {
    display: flex; gap: var(--s-3); align-items: center;
    list-style: none; margin: 0; padding: 0;
}
.nav__link {
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    font-size: var(--fs-small);
    font-weight: 500;
    padding: 6px 2px;
    border-bottom: 2px solid transparent;
}
.nav__link:hover { color: var(--white); }
.nav__link--active {
    color: var(--white);
    border-bottom-color: var(--gold);
}
.nav__toggle {
    display: none;
    background: none; border: none; color: var(--white);
    font-size: 22px; cursor: pointer; padding: 8px 12px;
    min-height: 44px; min-width: 44px;
}

.trust-strip {
    background: var(--cream-2);
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    border-bottom: 1px solid var(--divider);
}
.trust-strip__inner {
    max-width: var(--max-wide);
    margin: 0 auto;
    padding: 10px var(--s-2);
    display: flex; gap: var(--s-3); flex-wrap: wrap;
    align-items: center; justify-content: space-between;
}
.trust-strip__group { display: inline-flex; gap: var(--s-2); align-items: center; flex-wrap: wrap; }
.trust-strip__sep { color: var(--muted); }

/* ─── Section framing ─── */
.section {
    padding: var(--s-12) var(--s-2);
    border-bottom: 1px solid var(--divider);
}
.section:last-of-type { border-bottom: none; }
.section--cream { background: var(--cream); }
.section--white { background: var(--white); }
.section--navy  { background: var(--navy); color: var(--white); }

.section__inner {
    max-width: var(--max-content);
    margin: 0 auto;
}
.section__inner--wide {
    max-width: var(--max-wide);
    margin: 0 auto;
}

/* ─── Hero ─── */
.hero {
    padding: var(--s-12) var(--s-2);
    background: var(--ivory);
    border-top: 1px solid var(--divider);
    border-bottom: 1px solid var(--divider);
    text-align: left;
}
.hero__inner { max-width: var(--max-wide); margin: 0 auto; }
.hero__h1 {
    font-family: var(--font-serif);
    font-size: var(--fs-h1);
    line-height: 1.08;
    color: var(--navy);
    margin: 0 0 var(--s-4);
    font-weight: 700;
    letter-spacing: -0.01em;
}
.hero__h1 span { display: block; }
.hero__subline {
    font-family: var(--font-serif);
    font-size: 22px;
    line-height: 1.4;
    color: var(--navy);
    margin: var(--s-4) 0 0;
    max-width: 640px;
}
.hero__ctas {
    margin-top: var(--s-4);
    display: flex; gap: var(--s-2); flex-wrap: wrap;
}

/* ─── Hero stat quartet ─── */
.stat-quartet {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--s-2);
    margin: var(--s-4) 0 0;
}

/* ─── Section A: Edge triplet ─── */
.edge-triplet {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s-3);
    margin: var(--s-4) 0;
}

/* ─── Section B: controls bar ─── */
.controls-bar {
    display: flex; flex-wrap: wrap; gap: var(--s-2);
    align-items: center; justify-content: space-between;
    padding: var(--s-2); margin: var(--s-3) 0;
    background: var(--cream-2);
    border: 1px solid var(--divider);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
}
.controls-bar__group { display: inline-flex; gap: var(--s-2); align-items: center; }
.controls-bar__buttons { display: inline-flex; gap: var(--s-1); }

/* ─── Section C: two-card row ─── */
.validation-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--s-3);
}

/* ─── Footer ─── */
.footer {
    background: var(--navy);
    color: rgba(255,255,255,0.75);
    padding: var(--s-8) var(--s-2);
    font-size: var(--fs-small);
    line-height: 1.6;
}
.footer__inner { max-width: var(--max-wide); margin: 0 auto; }
.footer__architecture {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s-3);
    margin-bottom: var(--s-4);
    padding-bottom: var(--s-4);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer__disclosure {
    font-size: var(--fs-xs);
    color: rgba(255,255,255,0.55);
    max-width: 840px;
}
.footer__disclosure p { margin: 0 0 var(--s-1); }

/* ─── Responsive ─── */
@media (max-width: 760px) {
    .section { padding: var(--s-6) var(--s-2); }
    .hero { padding: var(--s-6) var(--s-2); }
    .stat-quartet { grid-template-columns: 1fr 1fr; gap: var(--s-1); }
    .edge-triplet { grid-template-columns: 1fr; }
    .validation-row { grid-template-columns: 1fr; }
    .footer__architecture { grid-template-columns: 1fr 1fr; }
    .nav__links { display: none; }
    .nav__links--open {
        display: flex; flex-direction: column; gap: var(--s-2);
        position: absolute; right: var(--s-2); top: 56px;
        background: var(--navy);
        padding: var(--s-2) var(--s-3);
        border: 1px solid rgba(255,255,255,0.1);
        border-radius: var(--radius-md);
    }
    .nav__toggle { display: inline-block; }
    .trust-strip__inner { font-size: 11px; }
    .hero__subline { font-size: 18px; }
    .hero__ctas { flex-direction: column; align-items: stretch; }
}