@import "@phosphor-icons/web/regular";

:root {
  --paper: #f4f2ed;
  --paper-strong: #ece9e1;
  --white: #fbfaf7;
  --ink: #16171b;
  --muted: #62636a;
  --rule: #b7b4ad;
  --rule-light: #d6d2c9;
  --rose: #923846;
  --rose-dark: #672631;
  --blue: #1767a6;
  --green: #11774f;
  --max-width: 1390px;
  color-scheme: light;
  font-family: Pretendard, "Noto Sans KR", "Apple SD Gothic Neo", Inter, system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(rgba(24, 25, 29, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(24, 25, 29, 0.018) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
  color: var(--ink);
  line-height: 1.65;
  word-break: keep-all;
}

a {
  color: inherit;
  text-decoration: none;
}

p,
h1,
h2,
h3,
h4,
dl,
dd,
figure,
ul {
  margin: 0;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button,
.button {
  font: inherit;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  padding: 9px 12px;
  background: var(--ink);
  color: #fff;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: relative;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(360px, 1.35fr) minmax(420px, 1fr);
  align-items: stretch;
  width: min(calc(100% - 48px), var(--max-width));
  min-height: 72px;
  margin: 0 auto;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule);
}

.brand {
  display: flex;
  gap: 18px;
  align-items: center;
  padding: 12px 28px 12px 2px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border: 1px solid var(--rose);
  color: var(--rose);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-copy strong {
  font-size: 25px;
  line-height: 1.15;
  letter-spacing: -0.05em;
}

.brand-copy small {
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.01em;
}

.map-title {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 30px;
  border-left: 1px solid var(--rule-light);
  color: var(--rose);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.map-title > span:last-child {
  font-weight: 500;
}

.top-nav {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 23px;
  padding: 0 2px 0 20px;
  border-left: 1px solid var(--rule-light);
}

.top-nav a {
  position: relative;
  padding: 24px 0;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.top-nav a::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: var(--rose);
  content: "";
  opacity: 0;
}

.top-nav a:hover::after,
.top-nav a:focus-visible::after,
.top-nav a.is-active::after {
  opacity: 1;
}

main,
.site-footer {
  width: min(calc(100% - 48px), var(--max-width));
  margin-inline: auto;
}

.section-band {
  scroll-margin-top: 24px;
  padding: 92px 30px;
  border-bottom: 1px solid var(--rule);
}

.hero {
  padding: 40px 30px 34px;
}

.system-summary {
  display: grid;
  grid-template-columns: minmax(360px, 0.9fr) minmax(660px, 1.55fr);
  gap: 56px;
  align-items: end;
  margin-bottom: 44px;
}

.system-kicker,
.eyebrow,
.erd-kicker,
.experience-kicker {
  margin-bottom: 8px;
  color: var(--rose);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.system-summary h1 {
  margin-bottom: 4px;
  font-size: clamp(27px, 2.25vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.055em;
  white-space: nowrap;
}

.system-summary h1 em {
  color: var(--blue);
  font-style: normal;
}

.system-summary > div > p:last-child {
  color: var(--muted);
  font-size: 13px;
}

.system-facts {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1fr 1.2fr;
  border-top: 1px solid var(--rule-light);
  border-bottom: 1px solid var(--rule-light);
}

.system-facts > div {
  min-width: 0;
  padding: 13px 20px 14px;
  border-left: 1px solid var(--rule-light);
}

.system-facts > div:first-child {
  border-left: 0;
}

.system-facts dt {
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 11px;
}

.system-facts dd {
  font-size: 17px;
  font-weight: 700;
  white-space: nowrap;
}

.system-facts a {
  margin-left: 7px;
  color: var(--blue);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
  font-weight: 500;
}

.live-signal {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-left: 8px;
  color: var(--blue);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 9px;
  letter-spacing: 0.08em;
  vertical-align: middle;
}

.live-signal::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 4px rgba(23, 103, 166, 0.1);
  content: "";
}

.map-row {
  display: grid;
  grid-template-columns: 145px minmax(0, 1fr);
  margin-top: 18px;
}

.map-label {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-right: 22px;
  border-right: 1px solid var(--rule);
}

.map-label strong {
  font-size: 13px;
  letter-spacing: 0.04em;
}

.map-label span {
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 9px;
  letter-spacing: 0.08em;
}

.commerce-row {
  margin-top: 0;
}

.commerce-flow {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr) 28px) minmax(0, 1fr);
  align-items: center;
  padding-left: 44px;
}

.commerce-flow::after {
  position: absolute;
  right: 4%;
  bottom: -17px;
  left: 12%;
  height: 17px;
  border-right: 1px solid var(--rose);
  border-bottom: 1px solid var(--rose);
  border-left: 1px solid var(--rose);
  content: "";
  opacity: 0.65;
}

.flow-node {
  position: relative;
  min-height: 185px;
  padding: 19px 22px 16px;
  border: 1px solid rgba(146, 56, 70, 0.7);
  background: rgba(251, 250, 247, 0.56);
}

.flow-node small {
  display: block;
  margin-bottom: 12px;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
}

.flow-node > i {
  color: var(--rose);
  font-size: 31px;
}

.flow-node h2 {
  margin: 7px 0 6px;
  font-size: 18px;
  letter-spacing: -0.04em;
}

.flow-node p {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.7;
}

.flow-connector {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-left: -7px;
  background: var(--paper);
  color: var(--rose);
  font-size: 21px;
}

.architecture-row > p,
.data-strip,
.infra-flow {
  min-height: 54px;
  margin-left: 44px;
  padding: 14px 22px;
  border: 1px solid var(--rule);
  background: rgba(251, 250, 247, 0.38);
}

.architecture-row > p {
  color: #36373c;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  text-align: center;
  word-spacing: 10px;
}

.architecture-row b {
  color: var(--rose);
  font-weight: 400;
}

.data-strip {
  display: grid;
  grid-template-columns: 28px auto auto 1fr;
  gap: 16px;
  align-items: center;
}

.data-strip > i {
  font-size: 25px;
}

.data-strip > strong {
  font-size: 14px;
}

.data-strip > em {
  color: var(--blue);
  font-size: 11px;
  font-style: normal;
  font-weight: 700;
}

.data-strip > p {
  padding-left: 20px;
  border-left: 1px solid var(--rule-light);
  color: var(--muted);
  font-size: 10px;
}

.infra-flow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.infra-flow span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  white-space: nowrap;
}

.infra-flow span > i {
  color: var(--blue);
  font-size: 22px;
}

.infra-flow > i {
  color: var(--rose);
  font-size: 15px;
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-left: 44px;
  border-bottom: 1px solid var(--rose);
}

.evidence-grid p {
  position: relative;
  padding: 7px 20px 15px;
  border-left: 1px solid var(--rule-light);
}

.evidence-grid p:first-child {
  border-left: 0;
}

.evidence-grid p::after {
  position: absolute;
  bottom: -5px;
  left: 50%;
  width: 7px;
  height: 7px;
  border: 2px solid var(--rose);
  border-radius: 50%;
  background: var(--paper);
  content: "";
}

.evidence-grid strong,
.evidence-grid span {
  display: block;
}

.evidence-grid strong {
  min-height: 37px;
  color: var(--blue);
  font-size: 11px;
  line-height: 1.55;
}

.evidence-grid span {
  color: var(--muted);
  font-size: 10px;
}

.system-actions {
  display: grid;
  grid-template-columns: 230px 260px minmax(0, 1fr);
  gap: 16px;
  margin-top: 42px;
}

.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  min-height: 58px;
  padding: 13px 22px;
  border: 1px solid var(--ink);
  background: transparent;
  font-size: 13px;
  font-weight: 700;
}

.button.primary {
  border-color: var(--rose-dark);
  background: var(--rose-dark);
  color: #fff;
}

.button:hover,
.button:focus-visible {
  border-color: var(--blue);
  color: var(--blue);
}

.button.primary:hover,
.button.primary:focus-visible {
  border-color: var(--rose);
  background: var(--rose);
  color: #fff;
}

.terminal-card {
  display: grid;
  grid-template-columns: auto 1fr;
  align-content: center;
  min-height: 88px;
  padding: 12px 22px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 9px;
}

.terminal-card p {
  margin-right: 20px;
  color: var(--muted);
}

.terminal-card p span {
  color: var(--rose);
}

.terminal-card strong {
  font-weight: 500;
}

.section-heading,
.project-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 30px;
  margin-bottom: 38px;
}

.section-heading h2,
.project-heading h2 {
  font-size: clamp(30px, 4vw, 58px);
  line-height: 1.05;
  letter-spacing: -0.06em;
}

.section-heading > p:last-child,
.project-lead {
  max-width: 670px;
  margin-top: 13px;
  color: var(--muted);
  font-size: 14px;
}

.project-status {
  display: flex;
  gap: 9px;
}

.project-status span,
.status-pill,
.experience-badge,
.erd-source {
  padding: 5px 9px;
  border: 1px solid var(--rule);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 9px;
}

.project-status .live-dot,
.status-pill {
  border-color: rgba(17, 119, 79, 0.35);
  color: var(--green);
}

.project-overview {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(390px, 0.85fr);
  gap: 30px;
}

.project-copy,
.project-visual,
.interviewer-guide,
.experience-card,
.previous-experience,
.erd-domain-card,
.erd-principles,
.erd-diagram-card,
.case-study,
.stack-grid article,
.contact-grid article {
  border: 1px solid var(--rule);
  background: rgba(251, 250, 247, 0.52);
}

.project-copy {
  padding: 34px;
}

.project-copy h3 {
  max-width: 620px;
  margin-bottom: 18px;
  font-size: 28px;
  line-height: 1.28;
  letter-spacing: -0.045em;
}

.project-copy > p:not(.tag-list):not(.scope-note) {
  color: var(--muted);
  font-size: 14px;
}

.project-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 28px 0;
  border-top: 1px solid var(--rule-light);
  border-bottom: 1px solid var(--rule-light);
}

.project-facts div {
  padding: 14px;
  border-left: 1px solid var(--rule-light);
}

.project-facts div:first-child {
  border-left: 0;
}

.project-facts dt {
  color: var(--muted);
  font-size: 10px;
}

.project-facts dd {
  font-weight: 700;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
  color: var(--blue);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
  line-height: 1.8;
}

.tag-list span:not(:last-child)::after {
  margin: 0 8px;
  color: var(--rule);
  content: "/";
}

.project-actions,
.guide-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 24px;
}

.text-link,
.live-project-link,
.contact-dev-link {
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.scope-note,
.guide-note,
.disclosure-note,
.erd-disclosure {
  margin-top: 17px;
  color: var(--muted);
  font-size: 10px;
}

.project-visual {
  min-height: 100%;
  padding: 28px;
}

.architecture-topline,
.erd-card-heading,
.case-study-heading,
.experience-card > header,
.previous-experience {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}

.architecture-topline {
  margin-bottom: 25px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
}

.architecture-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 10px;
  align-items: center;
}

.architecture-node {
  min-height: 115px;
  padding: 18px;
  border: 1px solid var(--rule);
}

.architecture-node.core {
  border-color: var(--rose);
}

.architecture-node span,
.architecture-node strong,
.architecture-node small {
  display: block;
}

.architecture-node span,
.architecture-node small {
  color: var(--muted);
  font-size: 9px;
}

.architecture-node strong {
  margin: 6px 0;
  font-size: 13px;
}

.flow-arrow {
  color: var(--rose);
  font-size: 15px;
}

.architecture-infra {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 20px;
}

.architecture-infra span {
  padding: 8px;
  border-top: 1px solid var(--rule-light);
  color: var(--muted);
  font-size: 9px;
  text-align: center;
}

.interviewer-guide {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  margin-top: 28px;
  padding: 26px;
}

.interviewer-guide h3 {
  max-width: 650px;
  font-size: 19px;
}

.interviewer-guide ol {
  margin: 14px 0 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 12px;
}

.guide-note {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 13px;
  border-top: 1px solid var(--rule-light);
}

.experience-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.experience-card {
  padding: 28px;
}

.experience-card h3,
.previous-experience h3 {
  font-size: 21px;
  letter-spacing: -0.035em;
}

.experience-summary {
  margin: 22px 0;
  color: var(--muted);
  font-size: 13px;
}

.experience-card ul {
  padding-left: 18px;
  color: #3f4045;
  font-size: 12px;
}

.experience-proof {
  margin: 22px 0 12px;
  padding: 11px 0;
  border-top: 1px solid var(--rule-light);
  border-bottom: 1px solid var(--rule-light);
  font-size: 11px;
}

.previous-experience {
  margin-top: 22px;
  padding: 24px 28px;
}

.previous-experience > p {
  max-width: 650px;
  color: var(--muted);
  font-size: 12px;
}

.erd-heading {
  grid-template-columns: 1fr;
}

.erd-overview {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 22px;
}

.erd-domain-card,
.erd-principles,
.erd-diagram-card {
  padding: 27px;
}

.erd-card-heading h3,
.erd-principles h3 {
  font-size: 19px;
}

.erd-domain-map {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 22px;
}

.erd-domain-map > div {
  min-height: 100px;
  padding: 16px;
  border: 1px solid var(--rule-light);
}

.erd-domain-map > div.core {
  border-color: var(--rose);
  background: rgba(146, 56, 70, 0.04);
}

.erd-domain-map small,
.erd-domain-map strong,
.erd-domain-map span {
  display: block;
}

.erd-domain-map small {
  color: var(--rose);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 9px;
}

.erd-domain-map strong {
  margin: 5px 0;
  font-size: 12px;
}

.erd-domain-map span {
  color: var(--muted);
  font-size: 9px;
}

.erd-principles ol {
  margin: 20px 0 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 12px;
}

.erd-diagram-card {
  margin-top: 22px;
}

.erd-legend {
  display: flex;
  gap: 14px;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 9px;
}

.erd-lanes {
  display: grid;
  gap: 12px;
  margin-top: 24px;
  overflow-x: auto;
}

.erd-lane {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr) 48px) minmax(150px, 1fr);
  align-items: center;
  min-width: 900px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule-light);
}

.erd-lane.compact {
  grid-template-columns: minmax(160px, 1fr) 48px minmax(180px, 1fr) 2fr;
  min-width: 620px;
}

.erd-entity {
  min-height: 73px;
  padding: 11px;
  border: 1px solid var(--rule);
  background: var(--white);
}

.erd-entity.anchor {
  border-color: var(--rose);
}

.erd-entity.payment {
  border-color: var(--blue);
}

.erd-entity small,
.erd-entity strong,
.erd-entity span {
  display: block;
}

.erd-entity small,
.erd-entity span {
  color: var(--muted);
  font-size: 8px;
}

.erd-entity strong {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 11px;
}

.erd-relation {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 7px;
}

.erd-relation i {
  border-top: 1px solid var(--rose);
}

.erd-notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.erd-notes article {
  padding: 20px 0;
  border-top: 2px solid var(--ink);
}

.erd-notes h3 {
  font-size: 14px;
}

.erd-notes p {
  margin-top: 8px;
  color: var(--muted);
  font-size: 11px;
}

.case-study-list {
  display: grid;
  gap: 18px;
}

.case-study {
  padding: 28px;
}

.case-number {
  color: var(--rose);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
}

.case-study-heading {
  justify-content: flex-start;
}

.case-study-heading h3 {
  font-size: 22px;
}

.case-study-heading p {
  color: var(--muted);
  font-size: 12px;
}

.data-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr) 32px) minmax(0, 1fr);
  align-items: center;
  margin-top: 25px;
}

.data-node {
  min-height: 84px;
  padding: 15px;
  border: 1px solid var(--rule);
  background: var(--white);
}

.data-node.accent {
  border-color: var(--rose);
}

.data-node small,
.data-node strong {
  display: block;
}

.data-node small {
  color: var(--blue);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
}

.data-node strong {
  margin-top: 5px;
  font-size: 11px;
}

.data-arrow {
  color: var(--rose);
  text-align: center;
}

.case-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 22px;
  border-top: 1px solid var(--rule-light);
}

.case-summary section {
  padding: 19px;
  border-left: 1px solid var(--rule-light);
}

.case-summary section:first-child {
  border-left: 0;
}

.case-summary h4 {
  margin-bottom: 7px;
  color: var(--rose);
  font-size: 11px;
}

.case-summary p {
  color: var(--muted);
  font-size: 11px;
}

.additional-cases {
  padding-top: 8px;
}

.additional-cases summary {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  width: fit-content;
  min-width: 290px;
  margin: 0 auto;
  padding: 12px 20px;
  border: 1px solid var(--ink);
  cursor: pointer;
  list-style: none;
  text-align: center;
}

.additional-cases summary::-webkit-details-marker {
  display: none;
}

.additional-cases summary::after {
  color: var(--rose);
  content: "+";
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 16px;
}

.additional-cases[open] summary::after {
  content: "−";
}

.additional-cases summary:hover,
.additional-cases summary:focus-visible {
  border-color: var(--rose);
  color: var(--rose);
}

.additional-cases .collapse-copy {
  display: none;
}

.additional-cases[open] .expand-copy {
  display: none;
}

.additional-cases[open] .collapse-copy {
  display: inline;
}

.additional-case-list {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.stack-grid,
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.stack-grid article,
.contact-grid article {
  min-height: 130px;
  padding: 22px;
}

.stack-grid h3,
.contact-grid span {
  display: block;
  margin-bottom: 10px;
  color: var(--rose);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 10px;
}

.stack-grid p,
.contact-grid a {
  font-size: 12px;
}

.contact-dev-link {
  display: inline-block;
  margin-top: 24px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 24px 30px 40px;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 9px;
}

@media (max-width: 1180px) {
  .site-header {
    grid-template-columns: minmax(280px, 0.9fr) minmax(280px, 1fr) auto;
  }

  .top-nav {
    gap: 14px;
  }

  .system-summary {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .system-facts {
    grid-template-columns: repeat(4, 1fr);
  }

  .commerce-flow {
    padding-left: 26px;
  }

  .flow-node {
    padding-inline: 15px;
  }

  .architecture-row > p,
  .data-strip,
  .infra-flow,
  .evidence-grid {
    margin-left: 26px;
  }

  .infra-flow span {
    font-size: 9px;
  }

  .system-actions {
    grid-template-columns: 210px 240px 1fr;
  }
}

@media (max-width: 900px) {
  .site-header {
    grid-template-columns: auto 1fr;
    width: min(calc(100% - 28px), var(--max-width));
  }

  .map-title {
    display: none;
  }

  .top-nav {
    overflow-x: auto;
  }

  main,
  .site-footer {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .section-band {
    padding: 70px 18px;
  }

  .hero {
    padding-top: 34px;
  }

  .map-row {
    grid-template-columns: 116px 1fr;
  }

  .commerce-flow {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .commerce-flow::after,
  .flow-connector {
    display: none;
  }

  .flow-node {
    display: grid;
    grid-template-columns: 32px 48px 80px 1fr;
    align-items: center;
    min-height: 82px;
  }

  .flow-node small,
  .flow-node h2,
  .flow-node p {
    margin: 0;
  }

  .flow-node p br {
    display: none;
  }

  .flow-node p {
    word-spacing: 8px;
  }

  .architecture-row > p,
  .data-strip,
  .infra-flow,
  .evidence-grid {
    margin-left: 18px;
  }

  .data-strip {
    grid-template-columns: 28px 1fr auto;
  }

  .data-strip p {
    grid-column: 1 / -1;
    padding: 10px 0 0;
    border-top: 1px solid var(--rule-light);
    border-left: 0;
  }

  .infra-flow {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .evidence-grid {
    grid-template-columns: repeat(2, 1fr);
    border-bottom: 0;
  }

  .evidence-grid p {
    border-bottom: 1px solid var(--rose);
  }

  .evidence-grid p::after {
    left: 16px;
  }

  .system-actions {
    grid-template-columns: repeat(2, 1fr);
  }

  .terminal-card {
    grid-column: 1 / -1;
  }

  .project-overview,
  .erd-overview,
  .interviewer-guide {
    grid-template-columns: 1fr;
  }

  .experience-grid,
  .stack-grid,
  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .data-flow {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .data-arrow {
    transform: rotate(90deg);
  }
}

@media (max-width: 680px) {
  body {
    background-size: 24px 24px;
    word-break: normal;
  }

  .site-header {
    grid-template-columns: 1fr auto;
    min-height: 60px;
  }

  .brand {
    gap: 10px;
    padding: 8px 0;
  }

  .brand-mark {
    width: 42px;
    height: 42px;
    font-size: 11px;
  }

  .brand-copy strong {
    font-size: 16px;
  }

  .brand-copy small {
    display: none;
  }

  .top-nav {
    gap: 14px;
    border: 0;
  }

  .top-nav a {
    padding-block: 17px;
    font-size: 10px;
  }

  .top-nav a:nth-child(3),
  .top-nav a:nth-child(4),
  .top-nav a:nth-child(5) {
    display: none;
  }

  .hero {
    padding-inline: 4px;
  }

  .system-summary h1 {
    font-size: 29px;
    white-space: normal;
  }

  .system-facts {
    grid-template-columns: repeat(2, 1fr);
  }

  .system-facts > div:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--rule-light);
  }

  .system-facts > div:nth-child(4) {
    border-top: 1px solid var(--rule-light);
  }

  .system-facts dd {
    font-size: 14px;
  }

  .system-facts a {
    display: block;
    margin: 3px 0 0;
  }

  .map-row {
    grid-template-columns: 1fr;
    margin-top: 26px;
  }

  .map-label {
    flex-direction: row;
    justify-content: space-between;
    margin-bottom: 8px;
    padding: 0 0 7px;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .commerce-flow,
  .architecture-row > p,
  .data-strip,
  .infra-flow,
  .evidence-grid {
    margin-left: 0;
    padding-left: 0;
  }

  .commerce-flow {
    padding: 0;
  }

  .architecture-row > p,
  .data-strip,
  .infra-flow {
    padding: 13px;
  }

  .architecture-row > p {
    text-align: left;
    word-spacing: 2px;
  }

  .infra-flow > i {
    display: none;
  }

  .evidence-grid {
    grid-template-columns: 1fr;
  }

  .evidence-grid p {
    padding-left: 12px;
    border-left: 0;
  }

  .evidence-grid strong {
    min-height: auto;
  }

  .system-actions {
    grid-template-columns: 1fr;
  }

  .terminal-card {
    grid-column: auto;
  }

  .section-band {
    padding: 62px 4px;
  }

  .hero {
    padding-top: 34px;
  }

  .flow-node {
    grid-template-columns: 28px 42px 58px 1fr;
    min-height: 100px;
    padding: 13px 14px;
  }

  .flow-node p br {
    display: block;
  }

  .flow-node p {
    line-height: 1.55;
    word-spacing: 0;
  }

  .project-heading,
  .section-heading {
    grid-template-columns: 1fr;
  }

  .project-status {
    justify-self: start;
  }

  .section-heading h2,
  .project-heading h2 {
    font-size: 38px;
  }

  .project-copy,
  .project-visual,
  .experience-card,
  .erd-domain-card,
  .erd-principles,
  .erd-diagram-card,
  .case-study,
  .stack-grid article,
  .contact-grid article {
    padding: 20px;
  }

  .project-overview,
  .experience-grid,
  .stack-grid,
  .contact-grid,
  .erd-notes {
    grid-template-columns: 1fr;
  }

  .project-facts,
  .architecture-infra {
    grid-template-columns: 1fr;
  }

  .project-facts div {
    border-top: 1px solid var(--rule-light);
    border-left: 0;
  }

  .project-facts div:first-child {
    border-top: 0;
  }

  .architecture-flow {
    grid-template-columns: 1fr;
  }

  .architecture-flow .flow-arrow {
    text-align: center;
  }

  .interviewer-guide,
  .previous-experience,
  .erd-card-heading,
  .experience-card > header {
    display: grid;
  }

  .guide-actions,
  .project-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .case-summary {
    grid-template-columns: 1fr;
  }

  .case-summary section {
    border-top: 1px solid var(--rule-light);
    border-left: 0;
  }

  .case-summary section:first-child {
    border-top: 0;
  }

  .site-footer {
    display: grid;
    gap: 7px;
    padding-inline: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}