/* Basis Group LLC — corporate site styles
   Structural/technical minimalism: grid-line panels, no photography.
   Space Grotesk (display) + Inter (body) + JetBrains Mono (labels).
   No JS dependency. Mobile-first. */

:root {
    --paper: #f4f5f2;
    --paper-soft: #e8eae5;
    --panel: #12151a;
    --panel-soft: #1c2129;
    --ink: #12151a;
    --ink-soft: #3a4048;
    --muted: #7c828a;
    --line: #d7dad4;
    --line-on-panel: rgba(244, 245, 242, 0.14);
    --accent: #2b3fd6;
    --accent-soft: #aab3f2;
    --on-panel: rgba(244, 245, 242, 0.94);
    --on-panel-soft: rgba(244, 245, 242, 0.62);

    --display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    --measure: 38rem;
    --measure-wide: 62rem;
    --pad-x: clamp(1.25rem, 5vw, 3rem);
    --section-y: clamp(3.5rem, 9vw, 6.5rem);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.6;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

img, svg { max-width: 100%; display: block; }

.skip {
    position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden;
}
.skip:focus {
    left: 1rem; top: 1rem; width: auto; height: auto;
    background: var(--panel); color: var(--paper);
    padding: 0.5rem 1rem; text-decoration: none; z-index: 100;
}

/* ── Nav ─────────────────────────────────────────────────────────── */
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem var(--pad-x);
    position: relative;
    z-index: 10;
}
.nav-overlay { position: absolute; top: 0; left: 0; right: 0; }
.nav-overlay .nav-mark,
.nav-overlay .nav-links a { color: var(--on-panel); }
.nav-overlay .nav-mark:hover,
.nav-overlay .nav-links a:hover { color: var(--accent-soft); }
.nav:not(.nav-overlay) { border-bottom: 1px solid var(--line); }

.nav-mark {
    font-family: var(--mono);
    font-size: 0.92rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
}
.nav-mark::before {
    content: "";
    width: 0.6rem; height: 0.6rem;
    background: var(--accent);
    display: inline-block;
}
.nav-mark:hover { color: var(--accent); }

.nav-links { display: flex; gap: 2.25rem; list-style: none; }
.nav-links a {
    font-size: 0.74rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-soft);
    text-decoration: none;
    transition: color 0.2s ease;
}
.nav-overlay .nav-links a { color: var(--on-panel-soft); }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--accent); }
.nav-overlay .nav-links a:hover,
.nav-overlay .nav-links a[aria-current="page"] { color: var(--accent-soft); }

/* ── Hero panel (grid pattern, no photography) ──────────────────── */
.hero-panel {
    position: relative;
    min-height: 78vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--panel);
    color: var(--on-panel);
}
.hero-panel .grid-bg {
    position: absolute; inset: 0; z-index: 0;
    background-image:
        linear-gradient(var(--line-on-panel) 1px, transparent 1px),
        linear-gradient(90deg, var(--line-on-panel) 1px, transparent 1px);
    background-size: 56px 56px;
    -webkit-mask-image: radial-gradient(ellipse 75% 65% at 50% 40%, #000 0%, transparent 78%);
    mask-image: radial-gradient(ellipse 75% 65% at 50% 40%, #000 0%, transparent 78%);
}
.hero-panel .plate {
    position: absolute; z-index: 0; border: 1px solid var(--line-on-panel);
}
.hero-content {
    position: relative; z-index: 2; flex: 1;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    text-align: center;
    padding: clamp(4rem, 10vw, 7rem) var(--pad-x) clamp(4.5rem, 9vw, 7rem);
}
.hero-eyebrow {
    font-family: var(--mono);
    font-size: 0.72rem; font-weight: 500; letter-spacing: 0.28em; text-transform: uppercase;
    color: var(--accent-soft); margin-bottom: 1.5rem;
}
.hero-wordmark {
    font-family: var(--display);
    font-weight: 500;
    font-size: clamp(2.6rem, 10vw, 5.75rem);
    letter-spacing: -0.01em;
    line-height: 1;
}
.hero-rule { width: clamp(3rem, 7vw, 4.5rem); height: 1px; background: var(--accent); margin: 2rem auto 1.75rem; border: 0; }
.hero-tagline {
    font-size: clamp(1.05rem, 2.2vw, 1.3rem);
    line-height: 1.55; max-width: 30rem; color: var(--on-panel-soft);
}
.hero-meta {
    margin-top: clamp(2.25rem, 5vw, 3.5rem);
    font-family: var(--mono);
    font-size: 0.7rem; font-weight: 500; letter-spacing: 0.2em; text-transform: uppercase;
    color: var(--on-panel-soft);
}
.hero-meta .sep { color: var(--accent-soft); margin: 0 0.7rem; }

/* Inner-page hero: shorter, eyebrow + headline */
.hero-panel.hero-inner { min-height: 42vh; }
.hero-panel.hero-inner .hero-content { padding: clamp(4rem, 9vw, 6.5rem) var(--pad-x) clamp(2.5rem, 5vw, 4rem); align-items: flex-start; text-align: left; }
.hero-panel.hero-inner .hero-eyebrow { margin-bottom: 1rem; }
.hero-panel.hero-inner .hero-headline {
    font-family: var(--display); font-weight: 500;
    font-size: clamp(2rem, 5vw, 3.25rem); line-height: 1.1; letter-spacing: -0.005em;
    max-width: 34rem;
}

/* ── Generic page main ──────────────────────────────────────────── */
main { flex: 1; }
.section { padding: var(--section-y) var(--pad-x); }
.measure { max-width: var(--measure); margin: 0 auto; }
.measure-wide { max-width: var(--measure-wide); margin: 0 auto; }

/* ── Mission / narrative ─────────────────────────────────────────── */
.mission { padding: clamp(4rem, 9vw, 7rem) var(--pad-x); }
.mission .eyebrow, .eyebrow {
    font-family: var(--mono);
    font-size: 0.7rem; font-weight: 500; letter-spacing: 0.24em; text-transform: uppercase;
    color: var(--accent); margin-bottom: 1.25rem; display: block;
}
.mission h2 {
    font-family: var(--display); font-weight: 500;
    font-size: clamp(1.7rem, 3.8vw, 2.5rem); line-height: 1.2; letter-spacing: -0.005em;
    color: var(--ink); margin: 0 0 1.75rem; max-width: 34rem;
}
.mission p { max-width: 36rem; font-size: 1rem; line-height: 1.75; color: var(--ink-soft); margin-bottom: 1.3rem; }
.mission p:last-child { margin-bottom: 0; }

/* ── Divider strip (dot-matrix, replaces photo break) ───────────── */
.divider-strip {
    width: 100%; height: clamp(4.5rem, 9vw, 7rem);
    background-image: radial-gradient(var(--line) 1.5px, transparent 1.5px);
    background-size: 22px 22px;
    background-color: var(--paper-soft);
    border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}

/* ── Principles / pillars grid ───────────────────────────────────── */
.principles { padding: clamp(4rem, 9vw, 6.5rem) var(--pad-x); background: var(--paper-soft); }
.principles .eyebrow { text-align: center; }
.principles h2 {
    text-align: center; font-family: var(--display); font-weight: 500;
    font-size: clamp(1.6rem, 3.6vw, 2.3rem); color: var(--ink);
    margin: 0 auto clamp(2.75rem, 6vw, 4rem); max-width: 30rem; line-height: 1.25;
}
.principles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.75rem, 4vw, 3rem); max-width: var(--measure-wide); margin: 0 auto; }
.principle { border-top: 2px solid var(--accent); padding-top: 1.1rem; }
.principle .num { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); margin-bottom: 0.6rem; letter-spacing: 0.05em; }
.principle h3 { font-family: var(--display); font-weight: 500; font-size: 1.2rem; color: var(--ink); margin-bottom: 0.75rem; line-height: 1.25; }
.principle p { font-size: 0.94rem; line-height: 1.7; color: var(--ink-soft); }
@media (max-width: 50rem) { .principles-grid { grid-template-columns: 1fr; gap: 2.25rem; } }

/* ── Two-column section (used on About: text + abstract mark) ──── */
.two-col { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 0; }
.two-col-graphic {
    background: var(--panel);
    aspect-ratio: 4 / 5; width: 100%;
    display: flex; align-items: center; justify-content: center;
}
.two-col-text { padding: clamp(2.5rem, 6vw, 5rem) clamp(1.5rem, 5vw, 4rem); max-width: 30rem; justify-self: center; }
.two-col-text h2 { font-family: var(--display); font-weight: 500; font-size: clamp(1.6rem, 3.6vw, 2.2rem); line-height: 1.2; margin-bottom: 1.4rem; color: var(--ink); }
.two-col-text p { font-size: 0.97rem; line-height: 1.75; color: var(--ink-soft); margin-bottom: 1.1rem; }
.two-col-text p:last-child { margin-bottom: 0; }
@media (max-width: 48rem) { .two-col { grid-template-columns: 1fr; } .two-col-graphic { aspect-ratio: 16/9; } }

/* ── Closing / CTA ───────────────────────────────────────────────── */
.closing { text-align: center; padding: clamp(4rem, 9vw, 6.5rem) var(--pad-x); }
.closing h2 { font-family: var(--display); font-weight: 500; font-size: clamp(1.5rem, 3.2vw, 2.1rem); color: var(--ink); margin-bottom: 1.9rem; line-height: 1.3; max-width: 32rem; margin-left: auto; margin-right: auto; }
.btn-primary {
    display: inline-block; padding: 0.9rem 2.25rem;
    font-family: var(--mono); font-size: 0.72rem; font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase;
    color: var(--paper); background: var(--ink); text-decoration: none; border: 1px solid var(--ink);
    transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ── Inner pages — generic ──────────────────────────────────────── */
.page-eyebrow { font-family: var(--mono); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.24em; text-transform: uppercase; color: var(--accent); margin-bottom: 1rem; }
.page-title { font-family: var(--display); font-weight: 500; font-size: clamp(2rem, 4.6vw, 3.1rem); line-height: 1.1; letter-spacing: -0.005em; margin-bottom: 2.25rem; color: var(--ink); }
.page-title-rule { width: 2.75rem; height: 2px; background: var(--accent); margin: 0 0 2.25rem 0; border: 0; }

.prose p { margin-bottom: 1.3rem; font-size: 1rem; line-height: 1.78; color: var(--ink-soft); }
.prose p:last-child { margin-bottom: 0; }
.prose a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-soft); transition: color 0.15s ease, border-color 0.15s ease; }
.prose a:hover { color: var(--ink); border-bottom-color: var(--ink); }
.prose .lede { font-size: clamp(1.1rem, 2.1vw, 1.3rem); color: var(--ink); line-height: 1.55; margin-bottom: 1.9rem; }
.prose h2 { font-family: var(--display); font-weight: 500; font-size: 1.4rem; letter-spacing: 0.002em; margin: 2.6rem 0 0.9rem; color: var(--ink); }

/* ── Contact specifics ──────────────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: max-content 1fr; gap: 0.75rem 2.5rem; margin-top: 2rem; }
.contact-grid dt { font-family: var(--mono); font-size: 0.7rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); padding-top: 0.4rem; align-self: start; }
.contact-grid dd { font-family: var(--display); font-size: 1.2rem; color: var(--ink); line-height: 1.4; }
.contact-grid a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--line); transition: border-color 0.15s ease, color 0.15s ease; }
.contact-grid a:hover { color: var(--accent); border-bottom-color: var(--accent); }
@media (max-width: 36rem) { .contact-grid { grid-template-columns: 1fr; gap: 0.25rem 0; } .contact-grid dd { margin-bottom: 1.25rem; } }

/* ── Legal pages ─────────────────────────────────────────────────── */
.legal-meta { font-size: 0.78rem; color: var(--muted); margin-bottom: 2rem; font-family: var(--mono); }
.legal h2 { font-family: var(--sans); font-weight: 600; font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink); margin: 2.25rem 0 0.75rem; }
.legal p { font-size: 0.93rem; line-height: 1.7; }

/* ── SMS opt-in sample card ──────────────────────────────────────── */
.optin-card { background: var(--paper-soft); border: 1px solid var(--line); border-left: 3px solid var(--accent); padding: clamp(1.25rem, 4vw, 2rem); margin: 1.75rem 0 2.25rem; max-width: 34rem; }
.optin-card .card-eyebrow { font-family: var(--mono); font-size: 0.66rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); margin-bottom: 1.1rem; }
.optin-row { display: flex; align-items: flex-start; gap: 0.7rem; }
.optin-row input[type=checkbox] { width: 1.05rem; height: 1.05rem; margin-top: 0.15rem; flex: 0 0 auto; accent-color: var(--accent); }
.optin-row .optin-label { font-size: 0.95rem; line-height: 1.45; color: var(--ink); }
.optin-row .optin-label strong { font-weight: 600; }
.optin-fineprint { font-size: 0.8rem; line-height: 1.6; color: var(--ink-soft); margin: 1.1rem 0 0 1.75rem; }
.optin-fineprint a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-soft); }
.optin-fineprint a:hover { color: var(--ink); border-bottom-color: var(--ink); }
.optin-note { font-size: 0.78rem; font-style: italic; color: var(--muted); margin-top: 0.85rem; }

/* ── Footer ──────────────────────────────────────────────────────── */
.footer {
    border-top: 1px solid var(--line);
    padding: 2rem var(--pad-x);
    display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem;
    font-size: 0.78rem; color: var(--muted);
}
.footer-mark { font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.06em; color: var(--ink-soft); }
.footer-links { display: flex; gap: 1.75rem; list-style: none; }
.footer-links a { color: var(--muted); text-decoration: none; transition: color 0.15s ease; }
.footer-links a:hover { color: var(--accent); }
@media (max-width: 30rem) { .footer { flex-direction: column; align-items: flex-start; gap: 0.85rem; } }

/* ── 404 ─────────────────────────────────────────────────────────── */
.not-found { text-align: center; padding: clamp(5rem, 15vw, 9rem) var(--pad-x); }
.not-found .num { font-family: var(--mono); font-size: clamp(3.5rem, 11vw, 6rem); color: var(--accent); line-height: 1; margin-bottom: 1rem; }
.not-found .msg { font-family: var(--display); font-size: 1.25rem; color: var(--ink-soft); margin-bottom: 2rem; }
.not-found a { font-family: var(--mono); font-size: 0.78rem; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--accent); padding-bottom: 0.2rem; }
.not-found a:hover { color: var(--accent); }