/* ARCH-01 revision 2 approved by Gerrit, 7 September 2026. */
/* Explicit section defaults preserve the approved proof inside both hosts. */
.zp-model { font-family: var(--font-body); font-size: 16px; line-height: 1.5; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
.zp-model, .zp-model *, .zp-model *::before, .zp-model *::after { box-sizing: border-box; }
.zp-model :where(h2, h3, h4, p) { margin: 0; padding: 0; }
.zp-model :where(h2, h3, h4) { font-family: var(--font-primary); }
.site-wrapper .zp-model { scroll-margin-top: 72px; }
/* Approved services, supporting partners and shared infrastructure. */
.zp-model { --model-rule: #344252; --model-soft-rule: #253140; padding: 48px 48px 72px; background: #070a10; }
.model-container { max-width: 1280px; margin: 0 auto; }
.model-header { display: grid; grid-template-columns: 1.65fr 1fr; gap: 0 56px; align-items: end; margin-bottom: 36px; }
.model-eyebrow { grid-column: 1 / -1; color: #a9b7c7; font-size: 11px; font-weight: 500; line-height: 1.4; letter-spacing: .18em; text-transform: uppercase; margin-bottom: 24px; display: flex; align-items: center; gap: 12px; }
.model-eyebrow::before { content: ''; width: 5px; height: 5px; background: #8fb6f0; border-radius: 50%; }
.model-header h2 { font-size: clamp(36px, 3.9vw, 56px); line-height: 1.12; letter-spacing: -.04em; font-weight: 500; margin: 0; color: #f4f4f0; }
.model-header h2 span { color: #8fb6f0; }
.model-intro { font-size: 16px; line-height: 1.75; color: #a9b7c7; max-width: 400px; margin: 0 0 4px; }
.model-diagram { --model-label-width: 172px; --model-column-gap: 32px; }
.model-row, .model-wiring { display: grid; grid-template-columns: var(--model-label-width) minmax(0, 1fr); column-gap: var(--model-column-gap); }
.model-row-label { padding-top: 27px; }
.model-caption { font-size: 10px; color: #a9b7c7; line-height: 1.5; letter-spacing: .08em; margin-bottom: 10px; }
.model-row-label h3 { font-size: 18px; font-weight: 500; color: #f4f4f0; line-height: 1.5; letter-spacing: -.02em; margin: 0; }
.model-support-content { display: grid; grid-template-columns: 1fr 1fr; background: #0c141f; border-top: 1px solid var(--model-rule); border-bottom: 1px solid var(--model-rule); padding: 20px 32px; gap: 36px; }
.model-partner + .model-partner { padding-left: 32px; border-left: 1px solid var(--model-soft-rule); }
.model-partner h4 { font-size: 18px; line-height: 1.4; font-weight: 500; letter-spacing: -.02em; margin-bottom: 8px; color: #f4f4f0; }
.model-partner p { font-size: 14px; line-height: 1.65; color: #a9b7c7; max-width: 42ch; }
.model-partner strong { font-weight: 500; color: #d5dde7; }
.model-wiring { height: 28px; }
.model-bus { grid-column: 2; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); position: relative; }
.model-bus::before { content: ''; position: absolute; height: 1px; background: var(--model-rule); top: 8px; left: 16.6667%; right: 16.6667%; }
.model-bus i { display: block; position: relative; width: 1px; height: 20px; align-self: end; justify-self: center; background: var(--model-rule); }
.model-bus i:nth-child(2) { height: 28px; }
.model-bus i::after { content: ''; position: absolute; left: -2px; bottom: -2px; width: 5px; height: 5px; border: 1px solid #8fb6f0; border-radius: 50%; background: #070a10; }
.model-zero-label { padding-top: 34px; }
.model-zero-label h3 { display: flex; align-items: center; gap: 9px; font-size: 23px; line-height: 1.4; }
.model-zero-label img { width: 24px; height: 24px; }
.model-label-note { margin-top: 10px; color: #a9b7c7; font-size: 12px; line-height: 1.6; max-width: 145px; }
.model-service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); padding: 24px 0 20px; }
.model-service { padding: 0 32px; display: grid; grid-template-rows: 68px minmax(86px, 1fr) auto; min-height: 212px; }
.model-service + .model-service { border-left: 1px solid var(--model-soft-rule); }
.model-service h4 { font-size: 27px; font-weight: 500; letter-spacing: -.025em; line-height: 1.22; margin: 0; color: #f4f4f0; }
.model-service p { font-size: 15px; line-height: 1.7; color: #a9b7c7; max-width: 31ch; padding-top: 12px; }
.model-service a { display: flex; gap: 14px; align-items: center; justify-content: space-between; width: fit-content; color: #f4f4f0; text-decoration: none; border-bottom: 1px solid #53677e; font-size: 12px; min-height: 44px; line-height: 1.5; padding: 10px 0; margin-top: 12px; transition: border-color 150ms ease, color 150ms ease; }
.model-service a span { color: #8fb6f0; font-size: 16px; }
.model-service a:hover { border-color: #f4f4f0; color: #8fb6f0; }
.model-service a:focus-visible { outline: 2px solid #8fb6f0; outline-offset: 5px; }
.model-wiring-bottom .model-bus { transform: scaleY(-1); }
.model-foundation { background: #0c141f; border-top: 1px solid #5a6f8a; border-bottom: 1px solid var(--model-rule); display: grid; grid-template-columns: 1.25fr 1fr; gap: 36px; padding: 24px 32px; }
.model-foundation h4 { font-size: 23px; font-weight: 500; letter-spacing: -.035em; line-height: 1.3; margin-bottom: 10px; color: #f4f4f0; }
.model-foundation p { color: #a9b7c7; font-size: 14px; line-height: 1.65; }
.model-foundation-partner { padding-left: 32px; border-left: 1px solid var(--model-soft-rule); display: grid; grid-template-columns: 1fr 1fr; column-gap: 24px; align-content: center; align-items: end; }
.model-foundation-partner .model-caption { grid-column: 1; font-size: 10px; margin: 0 0 4px; align-self: start; }
.model-foundation-partner .model-provider { grid-column: 1; font-size: 19px; color: #f4f4f0; letter-spacing: -.02em; }
.model-foundation-partner p:last-child { grid-column: 2; grid-row: 1 / 3; font-size: 12px; }
@media (max-width: 1199px) {
  .model-diagram { --model-label-width: 148px; --model-column-gap: 24px; }
  .model-header { column-gap: 40px; grid-template-columns: 1.5fr 1fr; }
  .model-header h2 { font-size: 43px; }
  .model-intro { font-size: 14px; }
  .model-service { padding: 0 24px; grid-template-rows: 64px minmax(112px, 1fr) auto; }
  .model-service h4 { font-size: 23px; }
  .model-service p { font-size: 14px; }
  .model-support-content, .model-foundation { padding-left: 24px; padding-right: 24px; gap: 24px; }
  .model-partner + .model-partner, .model-foundation-partner { padding-left: 24px; }
  .model-foundation-partner { display: block; }
  .model-foundation-partner p:last-child { margin-top: 6px; }
}
@media (max-width: 999px) {
  .zp-model { padding: 56px 32px 72px; }
  .model-header { display: block; margin-bottom: 40px; }
  .model-header h2 { font-size: clamp(36px, 5.7vw, 50px); }
  .model-intro { max-width: 560px; margin-top: 24px; font-size: 15px; }
  .model-row, .model-wiring { grid-template-columns: minmax(0, 1fr); }
  .model-row-label { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 0 0 14px; }
  .model-row-label .model-caption { margin-bottom: 0; }
  .model-row-label h3 { font-size: 18px; }
  .model-zero-label { padding-top: 12px; }
  .model-zero-label .model-label-note { display: none; }
  .model-zero-label h3 { font-size: 21px; }
  .model-wiring { height: 28px; }
  .model-bus { grid-column: 1; }
  .model-bus::before { top: 8px; }
  .model-bus i { height: 20px; }
  .model-bus i:nth-child(2) { height: 28px; }
  .model-service { padding: 0 24px; }
  .model-service-grid { padding: 20px 0 24px; }
  .model-infrastructure .model-row-label { padding-top: 22px; }
}
@media (max-width: 699px) {
  .zp-model { padding: 36px 24px 64px; }
  .model-header h2 { font-size: clamp(25px, 7.1vw, 44px); letter-spacing: -.035em; line-height: 1.16; }
  .model-eyebrow { font-size: 10px; margin-bottom: 16px; }
  .model-intro { font-size: 14px; line-height: 1.75; margin-top: 16px; }
  .model-header { margin-bottom: 28px; }
  .model-row-label { align-items: baseline; gap: 12px; }
  .model-row-label h3 { font-size: 16px; }
  .model-row-label .model-caption { font-size: 11px; }
  .model-support-content { grid-template-columns: 1fr; padding: 18px; gap: 16px; }
  .model-partner + .model-partner { border-left: 0; border-top: 1px solid var(--model-soft-rule); padding: 16px 0 0; }
  .model-partner h4 { font-size: 17px; }
  .model-partner p { font-size: 13px; }
  .model-wiring { height: 28px; }
  .model-bus { display: flex; justify-content: center; }
  .model-bus::before { display: none; }
  .model-bus i { height: 28px; }
  .model-bus i:not(:nth-child(2)) { display: none; }
  .model-zero-label { padding-top: 10px; padding-bottom: 18px; }
  .model-zero-label h3 { font-size: 20px; }
  .model-zero-label img { width: 20px; height: 20px; }
  .model-service-grid { grid-template-columns: 1fr; padding: 0 0 0 21px; border-left: 1px solid var(--model-rule); margin-left: 0; }
  .model-service { display: block; min-height: 0; padding: 24px 0; position: relative; }
  .model-service::before { content: ''; position: absolute; top: 37px; left: -22px; width: 12px; height: 1px; background: var(--model-rule); }
  .model-service + .model-service { border-left: 0; border-top: 1px solid var(--model-soft-rule); }
  .model-service:first-child { padding-top: 12px; }
  .model-service:first-child::before { top: 25px; }
  .desktop-break { display: none; }
  .model-service h4 { font-size: 24px; }
  .model-service p { font-size: 14px; padding-top: 12px; max-width: 40ch; }
  .model-service a { margin-top: 12px; font-size: 12px; }
  .model-infrastructure .model-row-label { padding-top: 18px; }
  .model-foundation { grid-template-columns: 1fr; padding: 24px 22px; gap: 22px; }
  .model-foundation h4 { font-size: 23px; }
  .model-foundation p { font-size: 13px; }
  .model-foundation-copy br { display: none; }
  .model-foundation-partner { border-left: 0; border-top: 1px solid var(--model-soft-rule); padding: 18px 0 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
  .model-foundation-partner .model-caption { font-size: 10px; }
  .model-foundation-partner p:last-child { margin: 0; font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) { .zp-model .model-service a { transition: none; } }

@media (max-width: 699px) {
  .model-wiring { display: none; }
  .model-zero-label { padding-top: 26px; }
  .model-row-label { flex-wrap: wrap; row-gap: 6px; }
}