/* ============================================================
   SELACORP — Website System (self-contained)
   Logotype: Condensed Authority · Palette: Manual Standard
   ============================================================ */

:root {
  --midnight:   #061B2E;
  --midnight-2: #0A2236;
  --midnight-3: #0D2A42;
  --graphite:   #111318;
  --graphite-2: #16191F;
  --accent:       #E9A23D;
  --accent-dim:   #845A0E;
  --paper:      #F4F0E6;
  --paper-2:    #EAE3D2;
  --steel:      #7D8A96;
  --steel-dim:  #5E6B77;
  --white:      #FFFFFF;

  --line-light:   rgba(244, 240, 230, 0.10);
  --line-light-2: rgba(244, 240, 230, 0.17);
  --line-dark:    rgba(6, 27, 46, 0.12);
  --line-dark-2:  rgba(6, 27, 46, 0.22);

  --font-display: 'Archivo', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --maxw: 1240px;
  --gutter: clamp(20px, 5vw, 64px);
  --radius: 7px;
  --radius-sm: 12px;
  --radius-lg: 26px;
  --nav-h: 70px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body { font-family: var(--font-body); background: var(--midnight); color: var(--paper); line-height: 1.55; overflow-x: hidden; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: var(--midnight); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); position: relative; z-index: 1; }
.section { position: relative; padding-block: clamp(64px, 9vw, 130px); overflow: hidden; }
.section--midnight { background: var(--midnight); }
.section--midnight-2 { background: var(--midnight-2); }
.section--midnight-3 { background: var(--midnight-3); }
.section--graphite { background: var(--graphite); }
.section--paper { background: var(--paper); color: var(--midnight); }
.section--paper .lede, .section--paper .body { color: color-mix(in srgb, var(--midnight) 78%, transparent); }

/* ---------- Logotype: Condensed Authority ---------- */
.logo {
  font-family: var(--font-display); font-weight: 800;
  letter-spacing: 0.04em; line-height: 1; color: var(--paper);
  white-space: nowrap; font-size: 1.25rem; display: inline-block;
}
.logo--ink { color: var(--midnight); }

/* ---------- Type ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  letter-spacing: 0.26em; text-transform: uppercase; color: var(--accent);
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--accent); }
.section--paper .eyebrow { color: var(--accent-dim); }
.section--paper .eyebrow::before { background: var(--accent-dim); }

.display { font-family: var(--font-display); font-weight: 800; font-size: clamp(2.5rem, 6.4vw, 5.2rem); line-height: 0.99; letter-spacing: -0.035em; text-wrap: balance; }
.h2 { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.8rem, 4vw, 3.2rem); line-height: 1.02; letter-spacing: -0.032em; text-wrap: balance; }
.h3 { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.15rem, 2vw, 1.5rem); line-height: 1.1; letter-spacing: -0.018em; }
.lede { font-size: clamp(1.05rem, 1.55vw, 1.32rem); line-height: 1.5; color: color-mix(in srgb, currentColor 86%, transparent); }
.body { font-size: 1rem; line-height: 1.62; color: color-mix(in srgb, currentColor 80%, transparent); }
.micro { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--steel); }
.measure { max-width: 60ch; }
.measure-sm { max-width: 44ch; }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-body); font-weight: 600; font-size: 0.92rem; letter-spacing: 0.01em; padding: 14px 26px; border-radius: 3px; cursor: pointer; border: 1px solid transparent; transition: background .15s ease, border-color .15s ease, color .15s ease; white-space: nowrap; }
.btn--primary { background: var(--paper); color: var(--midnight); }
.btn--primary:hover { background: var(--accent); color: var(--midnight); }
.btn--ghost { background: transparent; color: var(--paper); border-color: var(--line-light-2); }
.btn--ghost:hover { background: var(--accent); border-color: var(--accent); color: var(--midnight); }
.section--paper .btn--ghost { color: var(--midnight); border-color: var(--line-dark-2); }
.section--paper .btn--ghost:hover { color: var(--midnight); }
.btn--ink { background: var(--midnight); color: var(--paper); }
.btn--ink:hover { background: var(--accent); color: var(--midnight); }
.btn-arrow { transition: transform .25s; }
.btn:hover .btn-arrow { transform: translateX(3px); }

/* link with arrow */
.txtlink { display: inline-flex; align-items: center; gap: 9px; font-weight: 600; color: var(--accent); font-size: 0.95rem; }
.section--paper .txtlink { color: var(--accent-dim); }
.txtlink:hover .btn-arrow { transform: translateX(3px); }

/* ---------- Motifs ---------- */
.data-grid { position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    repeating-linear-gradient(to right, transparent 0, transparent calc((100% / 12) - 1px), var(--line-light) calc((100% / 12) - 1px), var(--line-light) calc(100% / 12)),
    repeating-linear-gradient(to bottom, transparent 0, transparent calc(96px - 1px), var(--line-light) calc(96px - 1px), var(--line-light) 96px);
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 16%, #000 84%, transparent);
          mask-image: linear-gradient(to bottom, transparent, #000 16%, #000 84%, transparent); }
.section--paper .data-grid { background-image:
    repeating-linear-gradient(to right, transparent 0, transparent calc((100% / 12) - 1px), var(--line-dark) calc((100% / 12) - 1px), var(--line-dark) calc(100% / 12)),
    repeating-linear-gradient(to bottom, transparent 0, transparent calc(96px - 1px), var(--line-dark) calc(96px - 1px), var(--line-dark) 96px); }
.hairline { height: 1px; width: 100%; background: var(--line-light); border: 0; }
.section--paper .hairline { background: var(--line-dark-2); }

/* ---------- Cards ---------- */
.card { position: relative; z-index: 1; background: var(--midnight-2); border: 1px solid var(--line-light); border-radius: var(--radius); padding: clamp(24px, 2.8vw, 36px); transition: transform .4s, border-color .4s; }
.card--graphite { background: var(--graphite-2); }
.card--paper { background: var(--paper); border-color: var(--line-dark-2); color: var(--midnight); }
.card-k { font-family: var(--font-mono); font-size: 11px; font-weight: 500; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent); display: block; margin-bottom: 16px; }
.section--paper .card--paper .card-k { color: var(--accent-dim); }

/* proof bullets */
.bullets { list-style: none; display: grid; gap: 11px; margin-top: 18px; }
.bullets li { display: flex; gap: 12px; font-size: 0.95rem; line-height: 1.45; color: color-mix(in srgb, currentColor 84%, transparent); }
.bullets li::before { content: ""; flex: none; width: 7px; height: 7px; border-radius: 50%; border: 1.5px solid var(--accent); margin-top: 0.45em; }

/* ---------- Top nav ---------- */
.nav { position: fixed; inset: 0 0 auto 0; z-index: 100; height: var(--nav-h); display: flex; align-items: center;
  background: var(--midnight);
  border-bottom: 1px solid transparent; transition: border-color .4s, background .4s, height .4s; }
.nav.is-scrolled { border-bottom-color: var(--line-light); height: 60px; background: var(--midnight); }
.nav .container { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.nav-links { display: flex; align-items: center; gap: clamp(18px, 2.4vw, 36px); }
.nav-links a { font-size: 0.92rem; color: color-mix(in srgb, var(--paper) 82%, transparent); transition: color .2s; position: relative; }
.nav-links a:hover { color: var(--paper); }
.nav-links a.is-active { color: var(--paper); }
.nav-links a.is-active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -7px; height: 2px; background: var(--accent); }
.nav-right { display: flex; align-items: center; gap: 20px; }
.nav-cta { padding: 10px 20px; font-size: 0.86rem; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 30px; height: 22px; position: relative; }
.nav-toggle span { position: absolute; left: 0; right: 0; height: 2px; background: var(--paper); transition: transform .3s, opacity .3s; }
.nav-toggle span:nth-child(1){ top: 2px; } .nav-toggle span:nth-child(2){ top: 10px; } .nav-toggle span:nth-child(3){ top: 18px; }
body.nav-open .nav-toggle span:nth-child(1){ transform: translateY(8px) rotate(45deg); }
body.nav-open .nav-toggle span:nth-child(2){ opacity: 0; }
body.nav-open .nav-toggle span:nth-child(3){ transform: translateY(-8px) rotate(-45deg); }

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .nav-menu { position: fixed; inset: var(--nav-h) 0 auto 0; background: var(--midnight); border-bottom: 1px solid var(--line-light);
    flex-direction: column; align-items: flex-start; gap: 0; padding: 10px var(--gutter) 28px; transform: translateY(-120%); transition: transform .4s cubic-bezier(.2,.7,.2,1); }
  body.nav-open .nav-menu { transform: none; }
  .nav-menu { display: flex; }
  .nav-links { flex-direction: column; align-items: stretch; gap: 0; width: 100%; }
  .nav-links a { padding: 16px 0; border-bottom: 1px solid var(--line-light); font-size: 1.05rem; }
  .nav-links a.is-active::after { display: none; }
  .nav-cta { margin-top: 20px; align-self: flex-start; }
}
@media (min-width: 861px) { .nav-menu { display: flex; align-items: center; gap: clamp(20px,2.6vw,40px); } }

/* ---------- Hero ---------- */
.hero { position: relative; padding-top: calc(var(--nav-h) + clamp(40px, 8vw, 90px)); padding-bottom: clamp(56px, 9vw, 120px); overflow: hidden; }
.hero-grid { display: grid; gap: clamp(28px, 4vw, 56px); }
.hero h1 { margin: 22px 0 24px; }
.hero .lede { max-width: 46ch; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: clamp(28px, 4vw, 40px); }
/* 01–04 columns hung off a single structural rail — connectors, not decoration */
.hero-stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: clamp(40px,6vw,64px); border-top: 1px solid var(--line-light-2); }
.hero-stat { position: relative; padding: 26px clamp(16px,2vw,28px) 0; border-left: 1px solid var(--line-light); }
.hero-stat:first-child { border-left: 0; padding-left: 0; }
.hero-stat::before { content: ""; position: absolute; top: -1px; left: clamp(16px,2vw,28px); width: 1px; height: 18px; background: var(--accent); opacity: .55; }
.hero-stat:first-child::before { left: 0; }
.hero-stat .n { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.8rem,3vw,2.6rem); letter-spacing: -0.03em; }
.hero-stat .l { margin-top: 6px; max-width: 22ch; }
@media (max-width: 720px){
  .hero-stat-row { grid-template-columns: repeat(2, 1fr); }
  .hero-stat:nth-child(3) { border-left: 0; padding-left: 0; }
  .hero-stat:nth-child(3)::before { left: 0; }
}
@media (max-width: 420px){
  .hero-stat-row { grid-template-columns: 1fr; }
  .hero-stat { border-left: 0; padding-left: 0; padding-top: 20px; }
  .hero-stat::before { display: none; }
}

/* ---------- Section head ---------- */
.head { display: grid; gap: 22px; margin-bottom: clamp(40px, 6vw, 66px); }
.head .display, .head .h2 { max-width: 20ch; }
.head--split { grid-template-columns: 1.15fr 1fr; gap: clamp(28px,5vw,72px); align-items: end; }
.head--split .lede, .head--split .body { max-width: 42ch; }
@media (max-width: 820px){ .head--split { grid-template-columns: 1fr; } }

/* ---------- Capability cards grid ---------- */
.cap-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(16px, 2vw, 24px); }
@media (max-width: 720px){ .cap-grid { grid-template-columns: 1fr; } }
.cap-card { display: flex; flex-direction: column; transition: background .25s ease, border-color .25s ease; }
.cap-card:hover, .eng-card:hover { transform: none; background: var(--midnight-3); border-color: color-mix(in srgb, var(--accent) 38%, transparent); }
.cap-icon { width: 50px; height: 50px; margin-bottom: 22px; color: var(--accent); }
.cap-card h3 { margin-bottom: 12px; }

/* ---------- Deep capability rows ---------- */
.cap-row { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(28px,5vw,70px); align-items: start; padding-block: clamp(40px,5vw,64px); border-top: 1px solid var(--line-light); }
.cap-row:first-child { border-top: 0; }
.section--paper .cap-row { border-color: var(--line-dark); }
@media (max-width: 820px){ .cap-row { grid-template-columns: 1fr; gap: 24px; } }
.cap-row .num { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.2em; color: var(--accent); }
.cap-row h3 { margin: 14px 0 0; font-size: clamp(1.5rem,2.6vw,2.1rem); }

/* ---------- Engagement list ---------- */
.eng-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: clamp(16px,2vw,24px); }
@media (max-width: 720px){ .eng-grid { grid-template-columns: 1fr; } }
.eng-card { position: relative; transition: background .25s ease, border-color .25s ease; }
.eng-card .en { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.2em; color: var(--accent); }
.eng-card h3 { margin: 14px 0 12px; }

/* ---------- Systems model diagram ---------- */
.model { display: grid; gap: 14px; }
.layer { position: relative; display: grid; grid-template-columns: auto 1fr; gap: clamp(18px,3vw,40px); align-items: center;
  border: 1px solid var(--line-light); border-radius: var(--radius); padding: clamp(22px,2.8vw,32px) clamp(22px,3vw,40px); background: var(--midnight-2); overflow: hidden; transition: border-color .4s, transform .4s; }
.layer:hover { border-color: color-mix(in srgb, var(--accent) 34%, transparent); transform: translateX(4px); }
.layer .lnum { font-family: var(--font-mono); font-size: clamp(2rem,4vw,3.2rem); font-weight: 500; color: color-mix(in srgb, var(--accent) 80%, transparent); line-height: 1; }
.layer h3 { margin-bottom: 8px; }
.layer .ll { display: flex; flex-direction: column; gap: 4px; }
.layer .connector { position: absolute; left: calc(clamp(22px,3vw,40px) + 0.5em); bottom: -14px; width: 2px; height: 14px; background: color-mix(in srgb,var(--accent) 40%, transparent); z-index: 2; }
@media (max-width: 600px){ .layer { grid-template-columns: 1fr; gap: 10px; } .layer .connector { display: none; } }

/* steps */
.steps { counter-reset: s; display: grid; gap: 0; }
.step { counter-increment: s; display: grid; grid-template-columns: auto 1fr; gap: 22px; padding: 20px 0; border-bottom: 1px solid var(--line-light); align-items: baseline; }
.section--paper .step { border-color: var(--line-dark); }
.step:last-child { border-bottom: 0; }
.step::before { content: counter(s, decimal-leading-zero); font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.1em; color: var(--accent); }
.section--paper .step::before { color: var(--accent-dim); }
.step p { font-size: clamp(1.05rem,1.8vw,1.3rem); font-family: var(--font-display); font-weight: 500; letter-spacing: -0.01em; }

/* two-col lists */
.cols-2 { columns: 2; column-gap: clamp(28px,5vw,64px); }
@media (max-width: 640px){ .cols-2 { columns: 1; } }
.list-clean { list-style: none; display: grid; gap: 14px; }
.list-clean li { display: flex; gap: 14px; break-inside: avoid; line-height: 1.45; }
.list-clean li::before { content: ""; flex: none; width: 7px; height: 7px; border-radius: 50%; border: 1.5px solid var(--accent); margin-top: 0.42em; }

/* ---------- CTA band ---------- */
.cta-band { position: relative; overflow: hidden; }
.cta-inner { display: grid; gap: 28px; justify-items: start; }
.cta-band .h2 { max-width: 18ch; }

/* ---------- Footer ---------- */
.foot { background: var(--graphite); border-top: 1px solid var(--line-light); padding-block: clamp(50px,7vw,80px); position: relative; overflow: hidden; }
.foot-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 36px; }
@media (max-width: 760px){ .foot-top { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px){ .foot-top { grid-template-columns: 1fr; } }
.foot-line { max-width: 38ch; color: color-mix(in srgb,var(--paper) 72%,transparent); margin-top: 20px; line-height: 1.6; font-size: 0.95rem; }
.foot-col h4 { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--steel); margin-bottom: 16px; }
.foot-col ul { list-style: none; display: grid; gap: 11px; }
.foot-col a, .foot-col .gv { font-size: 0.95rem; color: color-mix(in srgb,var(--paper) 84%,transparent); transition: color .2s; white-space: nowrap; }
.foot-col a:hover { color: var(--accent); }
.foot-col .gv[contenteditable] { outline: none; border-bottom: 1px dashed transparent; cursor: text; display: inline-block; }
.foot-col .gv[contenteditable]:hover, .foot-col .gv[contenteditable]:focus { border-bottom-color: var(--accent-dim); }
.foot-base { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 14px; margin-top: clamp(40px,6vw,60px); padding-top: 26px; border-top: 1px solid var(--line-light); }
.foot-base .micro { color: var(--steel-dim); }

/* ---------- Contact form ---------- */
.contact-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: clamp(28px,4vw,56px); align-items: start; }
@media (max-width: 860px){ .contact-grid { grid-template-columns: 1fr; } }
.form-card { background: var(--midnight-2); border: 1px solid var(--line-light); border-radius: var(--radius-lg); padding: clamp(26px,3.4vw,44px); position: relative; z-index: 1; }
.field { margin-bottom: 20px; }
.field label { display: block; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--steel); margin-bottom: 9px; }
.field input, .field select, .field textarea {
  width: 100%; font-family: var(--font-body); font-size: 0.98rem; color: var(--paper);
  background: var(--midnight); border: 1px solid var(--line-light-2); border-radius: 11px; padding: 14px 16px; transition: border-color .2s, background .2s; }
.field textarea { resize: vertical; min-height: 120px; }
.field input::placeholder, .field textarea::placeholder { color: var(--steel-dim); }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent); background: var(--midnight-3); }
.field select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237D8A96' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 16px center; padding-right: 40px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 520px){ .field-row { grid-template-columns: 1fr; } }
.form-confirm { display: none; text-align: left; }
.form-confirm.show { display: block; }
.form-confirm .ic { width: 46px; height: 46px; border-radius: 50%; border: 2px solid var(--accent); display: flex; align-items: center; justify-content: center; margin-bottom: 22px; }

.detail-block { display: grid; gap: 26px; }
.detail-item .dk { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; }
.detail-item .dv { font-size: 1.1rem; white-space: nowrap; }
.detail-item a.dv { color: inherit; text-decoration: none; transition: color .2s; }
.detail-item a.dv:hover { color: var(--accent); }
.detail-item .dv[contenteditable] { outline: none; border-bottom: 1px dashed transparent; cursor: text; display: inline-block; }
.detail-item .dv[contenteditable]:hover, .detail-item .dv[contenteditable]:focus { border-bottom-color: var(--accent-dim); }

/* ---------- Reveal (fail-safe: base is fully visible; is-in fades opacity only, no movement) ---------- */
.reveal { opacity: 1; transform: none; }
html.js .reveal { transition: opacity .65s cubic-bezier(.2,.7,.2,1); }
html.js .reveal:not(.is-in) { opacity: 0; }
html.js .reveal.is-in { opacity: 1; }
@media (prefers-reduced-motion: reduce){
  html.js .reveal, html.js .reveal:not(.is-in){ opacity: 1; transform: none; transition: none; }
  html{ scroll-behavior: auto; }
}

/* 01–04 column rail — links the four model layers into one system */
.colrail { position: relative; }
.colrail::before { content: ""; position: absolute; left: 0; right: 0; top: -22px; height: 1px; background: var(--line-dark-2); }
.colrail > * { position: relative; }
.colrail > *::before { content: ""; position: absolute; top: -22px; left: clamp(20px,2.8vw,36px); width: 1px; height: 22px; background: var(--accent-dim); opacity: .6; }
@media (max-width: 720px){ .colrail::before, .colrail > *::before { display: none; } }

/* utilities */
.mt-s { margin-top: 18px; } .mt-m { margin-top: 28px; } .mt-l { margin-top: 44px; }
.grid-2 { display:grid; grid-template-columns: repeat(2,1fr); gap: clamp(16px,2vw,24px); }
@media (max-width:720px){ .grid-2{ grid-template-columns:1fr; } }