/* ===========================================================
   Data X Capital Partners — stylesheet
   Handwritten CSS. No external resources. No Tailwind build step.
   Design tokens → reset → primitives → components → pages.
   =========================================================== */

:root {
    --color-paper: #ffffff;
    --color-ivory: #faf8f3;
    --color-ink: #0a0a0a;
    --color-graphite: #3a3a3a;
    --color-navy: #0b2545;
    --color-navy-soft: #13325c;
    --color-mute: #8a8a8a;
    --color-rule: #e4e0d7;
    --color-rule-strong: #c9c3b5;
    --color-gold: #8a6d3b;

    --font-serif: "Fraunces", "Iowan Old Style", "Apple Garamond", "Palatino Linotype", "Palatino", "Georgia", serif;
    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;

    --wrap: 1240px;
    --wrap-narrow: 820px;

    --s-1: 4px;
    --s-2: 8px;
    --s-3: 12px;
    --s-4: 16px;
    --s-5: 24px;
    --s-6: 32px;
    --s-7: 48px;
    --s-8: 64px;
    --s-9: 96px;
    --s-10: 128px;
    --s-11: 192px;

    --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font-sans); font-size: 17px; line-height: 1.65; color: var(--color-ink); background: var(--color-paper); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
img, svg { display: block; max-width: 100%; height: auto; }
button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; padding: 0; }
a { color: inherit; text-decoration: none; transition: color 200ms var(--ease); }
input, textarea, select { font: inherit; color: inherit; }

.serif { font-family: var(--font-serif); font-weight: 300; letter-spacing: -0.015em; }
.display { font-family: var(--font-serif); font-weight: 300; font-size: clamp(48px, 6.5vw, 80px); line-height: 1.05; letter-spacing: -0.025em; color: inherit; }
.h1 { font-family: var(--font-serif); font-weight: 300; font-size: clamp(36px, 4.5vw, 56px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 var(--s-5); }
.h2 { font-family: var(--font-serif); font-weight: 300; font-size: clamp(28px, 3.2vw, 40px); line-height: 1.15; letter-spacing: -0.015em; margin: 0 0 var(--s-5); }
.h3 { font-family: var(--font-sans); font-weight: 500; font-size: 22px; line-height: 1.35; margin: 0 0 var(--s-4); letter-spacing: -0.005em; }

.lede { font-family: var(--font-serif); font-weight: 300; font-size: clamp(20px, 2vw, 26px); line-height: 1.45; color: var(--color-graphite); letter-spacing: -0.01em; }
.body-lg { font-size: 19px; line-height: 1.7; color: var(--color-graphite); }
.body { font-size: 17px; line-height: 1.7; color: var(--color-graphite); }
.caption { font-family: var(--font-sans); font-size: 13px; line-height: 1.5; letter-spacing: 0.14em; text-transform: uppercase; color: var(--color-mute); }
.numeric { font-feature-settings: "tnum" 1, "lnum" 1; }

.bg-paper { background: var(--color-paper); }
.bg-ivory { background: var(--color-ivory); }
.bg-ink { background: var(--color-ink); color: var(--color-ivory); }
.bg-navy { background: var(--color-navy); color: var(--color-ivory); }

.wrap { width: min(var(--wrap), calc(100% - var(--s-6))); margin-inline: auto; }
.wrap-narrow { width: min(var(--wrap-narrow), calc(100% - var(--s-6))); margin-inline: auto; }
.section { padding-block: var(--s-9); }
.section-lg { padding-block: var(--s-10); }
.section.tight { padding-block: var(--s-8); }

.rule { height: 1px; background: var(--color-rule); border: 0; margin: 0; }
.rule-dark { height: 1px; background: rgba(255,255,255,0.18); border: 0; margin: 0; }

.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-7); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-7); }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--s-6); }

.stack > * + * { margin-top: var(--s-5); }
.stack-lg > * + * { margin-top: var(--s-7); }

@media (max-width: 860px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--s-3);
    padding: 14px 28px;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    border: 1px solid currentColor;
    transition: background 200ms var(--ease), color 200ms var(--ease);
}
.btn::after { content: "→"; transition: transform 200ms var(--ease); }
.btn:hover::after { transform: translateX(4px); }

.btn-primary { background: var(--color-ink); color: var(--color-ivory); border-color: var(--color-ink); }
.btn-primary:hover { background: var(--color-navy); border-color: var(--color-navy); }
.btn-ghost { color: var(--color-ink); }
.btn-ghost:hover { background: var(--color-ink); color: var(--color-ivory); }
.btn-on-dark { color: var(--color-ivory); border-color: var(--color-ivory); }
.btn-on-dark:hover { background: var(--color-ivory); color: var(--color-ink); }

.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: saturate(160%) blur(8px);
    -webkit-backdrop-filter: saturate(160%) blur(8px);
    border-bottom: 1px solid var(--color-rule);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: var(--s-4);
    gap: var(--s-6);
}
.brand { display: flex; align-items: center; gap: var(--s-3); }
.brand-mark {
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    background: var(--color-ink);
    color: var(--color-ivory);
    font-family: var(--font-serif);
    font-weight: 400;
    font-size: 16px;
    letter-spacing: -0.02em;
}
.brand-mark.large { width: 56px; height: 56px; font-size: 22px; }
.brand-name {
    font-family: var(--font-serif);
    font-weight: 400;
    font-size: 19px;
    letter-spacing: -0.01em;
    color: var(--color-ink);
}
.brand-name .x { font-style: italic; color: var(--color-gold); }

.site-nav { display: flex; align-items: center; gap: var(--s-7); }
.site-nav a {
    font-size: 14px;
    letter-spacing: 0.06em;
    color: var(--color-graphite);
    position: relative;
    padding-block: 6px;
}
.site-nav a:hover { color: var(--color-ink); }
.site-nav a.is-current { color: var(--color-ink); }
.site-nav a.is-current::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: var(--color-ink);
}
.site-nav a.nav-cta {
    padding: 10px 22px;
    background: var(--color-ink);
    color: var(--color-ivory);
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.14em;
}
.site-nav a.nav-cta:hover { background: var(--color-navy); color: var(--color-ivory); }
.site-nav a.nav-cta.is-current::after { display: none; }

.nav-toggle { display: none; width: 32px; height: 24px; position: relative; }
.nav-toggle span { position: absolute; left: 0; right: 0; height: 1.5px; background: var(--color-ink); }
.nav-toggle span:nth-child(1) { top: 4px; }
.nav-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav-toggle span:nth-child(3) { bottom: 4px; }

.mobile-menu { display: none; flex-direction: column; gap: var(--s-4); padding: var(--s-5) var(--s-6); border-top: 1px solid var(--color-rule); background: var(--color-paper); }
.mobile-menu a { font-family: var(--font-serif); font-size: 22px; color: var(--color-ink); }

@media (max-width: 840px) {
    .site-nav { display: none; }
    .nav-toggle { display: block; }
    .brand-name { font-size: 16px; }
    .mobile-menu[data-open="true"] { display: flex; }
}

/* Hero */
.hero {
    position: relative;
    min-height: 86vh;
    display: flex;
    align-items: flex-end;
    color: var(--color-ivory);
    overflow: hidden;
    isolation: isolate;
}
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: url("/images/datax_hero_architecture_monochrome.jpg");
    background-size: cover;
    background-position: center 30%;
    z-index: -2;
    filter: grayscale(20%) brightness(0.75);
}
.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(11, 37, 69, 0.55) 0%, rgba(10, 10, 10, 0.78) 100%);
    z-index: -1;
}
.hero-inner {
    padding-block: var(--s-11) var(--s-9);
    max-width: 960px;
}
.hero .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--s-3);
    margin-bottom: var(--s-6);
    color: rgba(250, 248, 243, 0.85);
    font-size: 13px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}
.hero .eyebrow::before {
    content: "";
    display: inline-block;
    width: 36px;
    height: 1px;
    background: currentColor;
}
.hero h1 { color: var(--color-ivory); margin-bottom: var(--s-6); }
.hero .hero-lede {
    color: rgba(250, 248, 243, 0.85);
    max-width: 680px;
    margin-bottom: var(--s-7);
    font-family: var(--font-serif);
    font-weight: 300;
    font-size: clamp(20px, 2vw, 26px);
    line-height: 1.45;
    letter-spacing: -0.01em;
}
.hero-actions { display: flex; gap: var(--s-4); flex-wrap: wrap; }

/* Section title pattern */
.section-title {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: var(--s-8);
    align-items: baseline;
    margin-bottom: var(--s-8);
}
.section-title .caption { margin: 0; }
.section-title .h2 { margin: 0; max-width: 760px; }
@media (max-width: 860px) {
    .section-title { grid-template-columns: 1fr; gap: var(--s-4); }
}

/* Pillars */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--color-rule); border-bottom: 1px solid var(--color-rule); }
.pillar {
    padding: var(--s-8) var(--s-6);
    border-right: 1px solid var(--color-rule);
    transition: background 300ms var(--ease);
}
.pillar:last-child { border-right: 0; }
.pillar:hover { background: var(--color-ivory); }
.pillar-num {
    font-family: var(--font-serif);
    font-size: 14px;
    color: var(--color-gold);
    margin-bottom: var(--s-5);
    letter-spacing: 0.2em;
}
.pillar .h3 { margin-bottom: var(--s-4); }
.pillar p { margin: 0; color: var(--color-graphite); }
@media (max-width: 860px) {
    .pillars { grid-template-columns: 1fr; }
    .pillar { border-right: 0; border-bottom: 1px solid var(--color-rule); }
    .pillar:last-child { border-bottom: 0; }
}

/* Stats */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    background: var(--color-ink);
    color: var(--color-ivory);
}
.stat {
    padding: var(--s-8) var(--s-6);
    border-right: 1px solid rgba(255, 255, 255, 0.12);
}
.stat:last-child { border-right: 0; }
.stat-value {
    font-family: var(--font-serif);
    font-weight: 300;
    font-size: clamp(42px, 4.8vw, 64px);
    line-height: 1;
    letter-spacing: -0.03em;
    margin-bottom: var(--s-4);
}
.stat-label {
    font-size: 12px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(250, 248, 243, 0.65);
}
@media (max-width: 860px) {
    .stats { grid-template-columns: repeat(2, 1fr); }
    .stat { border-right: 1px solid rgba(255, 255, 255, 0.12); border-bottom: 1px solid rgba(255, 255, 255, 0.12); }
    .stat:nth-child(2n) { border-right: 0; }
    .stat:nth-child(n+3) { border-bottom: 0; }
}

/* Approach phases */
.phases { display: grid; gap: 0; }
.phase {
    display: grid;
    grid-template-columns: 120px 280px 1fr;
    gap: var(--s-7);
    padding-block: var(--s-7);
    border-top: 1px solid var(--color-rule);
    align-items: start;
}
.phase:last-child { border-bottom: 1px solid var(--color-rule); }
.phase-num {
    font-family: var(--font-serif);
    font-size: 48px;
    font-weight: 300;
    line-height: 1;
    color: var(--color-gold);
    letter-spacing: -0.02em;
}
.phase-title {
    font-family: var(--font-serif);
    font-size: 28px;
    font-weight: 300;
    letter-spacing: -0.015em;
    margin: 0;
    line-height: 1.2;
}
.phase-body { color: var(--color-graphite); max-width: 560px; }
.phase-body > * + * { margin-top: var(--s-3); }
@media (max-width: 860px) {
    .phase { grid-template-columns: 1fr; gap: var(--s-3); }
    .phase-num { font-size: 36px; }
}

/* Image bands */
.band {
    background-color: var(--color-ivory);
    height: clamp(320px, 42vw, 520px);
    position: relative;
    isolation: isolate;
}
.band::before {
    content: "";
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    z-index: -1;
    filter: grayscale(25%);
}
.band::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0.15) 0%, rgba(0,0,0,0.45) 100%);
    z-index: -1;
}
.band.band-about::before { background-image: url("/images/datax_about_boardroom.jpg"); }
.band.band-approach::before { background-image: url("/images/datax_approach_geometry.jpg"); }

/* Leadership */
.leaders { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-7); }
.leader-avatar {
    aspect-ratio: 4/5;
    background: var(--color-ink);
    color: var(--color-ivory);
    display: grid;
    place-items: center;
    font-family: var(--font-serif);
    font-size: 64px;
    font-weight: 300;
    margin-bottom: var(--s-5);
    letter-spacing: -0.02em;
}
.leader-name {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 400;
    margin: 0 0 var(--s-2);
    letter-spacing: -0.01em;
}
.leader-role {
    font-size: 13px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-mute);
    margin: 0 0 var(--s-4);
}
.leader-bio { color: var(--color-graphite); margin: 0; font-size: 16px; }
@media (max-width: 860px) { .leaders { grid-template-columns: 1fr; } }

/* Values */
.values { border-top: 1px solid var(--color-rule); margin-top: var(--s-7); }
.value {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: var(--s-6);
    padding-block: var(--s-5);
    border-bottom: 1px solid var(--color-rule);
    align-items: baseline;
}
.value-num {
    font-family: var(--font-serif);
    font-size: 16px;
    color: var(--color-gold);
    letter-spacing: 0.1em;
}
.value-text {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 300;
    font-size: clamp(20px, 2vw, 24px);
    line-height: 1.45;
    color: var(--color-ink);
    margin: 0;
}

/* Engagement cards */
.engagements { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s-7); }
.engagement {
    padding: var(--s-7);
    background: var(--color-ivory);
    border: 1px solid var(--color-rule);
}
.engagement h3 {
    font-family: var(--font-serif);
    font-weight: 400;
    font-size: 28px;
    letter-spacing: -0.015em;
    margin: 0 0 var(--s-4);
}
.engagement .engagement-caption { margin: 0 0 var(--s-5); color: var(--color-mute); font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; }
.engagement ul { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--color-rule); }
.engagement li {
    padding-block: var(--s-3);
    border-bottom: 1px solid var(--color-rule);
    color: var(--color-graphite);
    font-size: 16px;
    display: flex;
    gap: var(--s-3);
}
.engagement li::before { content: "—"; color: var(--color-gold); flex-shrink: 0; }
@media (max-width: 860px) { .engagements { grid-template-columns: 1fr; } }

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: var(--s-9);
    align-items: start;
}
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; gap: var(--s-7); } }

.contact-details { border-left: 1px solid var(--color-rule); padding-left: var(--s-6); }
.contact-details h4 { font-family: var(--font-serif); font-size: 22px; font-weight: 400; margin: 0 0 var(--s-4); }
.contact-details address {
    font-style: normal;
    color: var(--color-graphite);
    margin-bottom: var(--s-5);
    font-size: 16px;
    line-height: 1.6;
}
.contact-details address strong {
    display: block;
    color: var(--color-ink);
    font-weight: 500;
    letter-spacing: 0.02em;
    margin-bottom: var(--s-1);
}
.contact-detail-divider { height: 1px; background: var(--color-rule); margin: var(--s-5) 0; }

.form { display: grid; gap: var(--s-5); }
.field { display: grid; gap: var(--s-2); }
.field label {
    font-size: 12px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-mute);
}
.field input,
.field select,
.field textarea {
    width: 100%;
    padding: 14px 16px;
    background: var(--color-paper);
    border: 1px solid var(--color-rule-strong);
    border-radius: 0;
    font-size: 16px;
    color: var(--color-ink);
    transition: border-color 200ms var(--ease);
    font-family: var(--font-sans);
}
.field textarea { resize: vertical; min-height: 160px; font-family: var(--font-sans); }
.field input:focus,
.field select:focus,
.field textarea:focus { outline: none; border-color: var(--color-ink); }
.field .field-error { font-size: 13px; color: #8a1e1e; margin-top: var(--s-1); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-5); }
@media (max-width: 640px) { .field-row { grid-template-columns: 1fr; } }

.form-note {
    font-size: 13px;
    color: var(--color-mute);
    border-top: 1px solid var(--color-rule);
    padding-top: var(--s-4);
    margin-top: var(--s-2);
}

.flash-success {
    padding: var(--s-5) var(--s-6);
    background: var(--color-ivory);
    border-left: 3px solid var(--color-gold);
    color: var(--color-ink);
    margin-bottom: var(--s-6);
    font-size: 16px;
}

/* Legal pages */
.legal-wrap { padding-block: var(--s-9) var(--s-10); }
.legal-wrap .caption { margin-bottom: var(--s-4); display: block; }
.legal-wrap .h1 { margin-bottom: var(--s-7); }
.legal-body { color: var(--color-graphite); }
.legal-body h2 { font-family: var(--font-serif); font-weight: 400; font-size: 26px; margin: var(--s-7) 0 var(--s-3); color: var(--color-ink); letter-spacing: -0.01em; }
.legal-body h3 { font-family: var(--font-sans); font-weight: 500; font-size: 18px; margin: var(--s-6) 0 var(--s-2); color: var(--color-ink); }
.legal-body p { margin: 0 0 var(--s-4); }
.legal-body ul { padding-left: var(--s-5); margin: 0 0 var(--s-4); }
.legal-body li { margin-bottom: var(--s-2); }

/* CTA band */
.cta-band { background: var(--color-navy); color: var(--color-ivory); padding-block: var(--s-9); }
.cta-band-inner {
    display: grid;
    grid-template-columns: 1.4fr auto;
    gap: var(--s-8);
    align-items: center;
}
.cta-band .h2 { color: var(--color-ivory); margin: 0; }
.cta-band p { color: rgba(250, 248, 243, 0.75); max-width: 680px; margin: var(--s-4) 0 0; }
@media (max-width: 860px) { .cta-band-inner { grid-template-columns: 1fr; } }

/* Footer */
.site-footer { background: var(--color-ink); color: var(--color-ivory); padding-top: var(--s-9); }
.footer-inner {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.5fr 1fr;
    gap: var(--s-7);
    padding-bottom: var(--s-8);
}
.footer-col h4 {
    font-size: 12px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(250, 248, 243, 0.5);
    margin: 0 0 var(--s-4);
    font-weight: 500;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: var(--s-3); color: rgba(250, 248, 243, 0.78); font-size: 15px; }
.footer-col a:hover { color: var(--color-ivory); }
.footer-col.footer-brand .brand-mark { margin-bottom: var(--s-4); }
.footer-tagline { font-family: var(--font-serif); font-style: italic; font-weight: 300; font-size: 18px; color: rgba(250, 248, 243, 0.75); margin: 0; max-width: 260px; line-height: 1.5; }
.footer-base { border-top: 1px solid rgba(255,255,255,0.10); padding-block: var(--s-5); background: #060606; }
.footer-base-inner {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--s-6);
    align-items: baseline;
    font-size: 12px;
    color: rgba(250, 248, 243, 0.5);
    letter-spacing: 0.02em;
}
.footer-base .disclosure { text-align: right; }
@media (max-width: 860px) {
    .footer-inner { grid-template-columns: 1fr 1fr; }
    .footer-base-inner { grid-template-columns: 1fr; gap: var(--s-2); }
    .footer-base .disclosure { text-align: left; }
}
@media (max-width: 560px) { .footer-inner { grid-template-columns: 1fr; } }

/* Fade-in */
.fade-in { opacity: 0; transform: translateY(12px); transition: opacity 400ms var(--ease), transform 400ms var(--ease); }
.fade-in.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .fade-in { opacity: 1; transform: none; transition: none; } }

:focus-visible { outline: 2px solid var(--color-gold); outline-offset: 2px; }

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--color-ink);
    color: var(--color-ivory);
    padding: var(--s-3) var(--s-5);
    z-index: 100;
}
.skip-link:focus { left: 0; }