:root {
  --bg: #f7f7f7;
  --surface: #ffffff;
  --ink: #121212;
  --muted: #555555;
  --line: #d9d9d9;
  --line-strong: #acacac;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Sora", "Noto Sans KR", sans-serif;
  line-height: 1.6;
}

.progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--ink);
  z-index: 50;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(247, 247, 247, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 4vw;
}

.brand {
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9rem;
  position: relative;
}

nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 1px;
  background: var(--ink);
  transition: width 0.2s ease;
}

nav a:hover::after,
nav a.active::after {
  width: 100%;
}

main {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

.section {
  padding: 10vh 0;
  border-bottom: 1px solid var(--line);
}

.kicker {
  margin: 0 0 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.74rem;
  color: var(--muted);
}

.section-head {
  display: grid;
  grid-template-columns: 1.1fr 1.2fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2.8rem);
  line-height: 1.2;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 2rem;
  min-height: 80vh;
  align-items: end;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 4.8rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
}

.page-hero p {
  margin: 1rem 0 0;
  max-width: 56ch;
  color: var(--muted);
}

.hero-copy > p {
  margin: 1.2rem 0 0;
  max-width: 42ch;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  gap: 0.7rem;
  margin-top: 1.4rem;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid var(--ink);
  padding: 0.6rem 1rem;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.88rem;
  transition: background 0.2s ease, color 0.2s ease;
}

.btn.solid,
.btn:hover {
  background: var(--ink);
  color: #fff;
}

.hero-visual {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1rem;
}

.hero-visual figcaption {
  margin-top: 0.8rem;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.diagram-grid {
  min-height: 420px;
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 24px 24px,
    radial-gradient(circle at 30% 30%, #222 0 18%, transparent 19%),
    radial-gradient(circle at 65% 60%, #444 0 16%, transparent 17%),
    radial-gradient(circle at 45% 80%, #666 0 10%, transparent 11%);
  border: 1px solid var(--line-strong);
}

.tab-grid,
.split-layout,
.project-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.tab-card,
.split-layout article,
.project-list article,
.manifesto-grid article,
.insight-list article,
.process-steps li,
.philosophy-grid article {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1rem;
}

.tab-card h3,
.split-layout h3,
.project-list h3,
.insight-list h3 {
  margin: 0.2rem 0 0.4rem;
}

.tab-card p,
.split-layout p,
.project-list p,
.insight-list p {
  margin: 0;
  color: var(--muted);
}

.project-thumb {
  height: 140px;
  margin: -1rem -1rem 0.8rem;
  background-size: cover;
  background-position: center;
  border-bottom: 1px solid var(--line);
  background-color: #efefef;
}

.tab-card a {
  display: inline-block;
  margin-top: 0.8rem;
  font-size: 0.85rem;
  color: var(--ink);
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.philosophy-grid h3,
.manifesto-grid strong {
  margin: 0 0 0.4rem;
}

.manifesto-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.manifesto-grid strong {
  display: block;
  font-size: 1.2rem;
}

.project-case {
  border: 1px solid var(--line);
  background: var(--surface);
}

.case-head {
  padding: 1.2rem;
  border-bottom: 1px solid var(--line);
}

.case-meta {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.case-head h3 {
  margin: 0.35rem 0;
  font-size: clamp(1.3rem, 2.6vw, 2rem);
}

.case-one-line {
  margin: 0;
  color: var(--muted);
  max-width: 60ch;
}

.case-media {
  height: clamp(220px, 38vw, 420px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(130deg, #171717 0%, #3f3f3f 42%, #d5d5d5 100%);
}

.case-media.has-image {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.case-grid section {
  padding: 1rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.case-grid section:nth-child(2n) {
  border-right: 0;
}

.case-grid h4 {
  margin: 0 0 0.4rem;
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.case-grid p {
  margin: 0;
  color: var(--muted);
}

.process-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.process-steps strong {
  font-size: 1rem;
  display: block;
}

.process-steps span {
  color: var(--muted);
  font-size: 0.9rem;
}

.insight-list {
  display: grid;
  gap: 0.7rem;
}

.contact-cta {
  text-align: center;
  border-bottom: 0;
}

.contact-cta h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.4rem, 4vw, 2.2rem);
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1080px) {
  .hero,
  .section-head,
  .tab-grid,
  .split-layout,
  .project-list,
  .philosophy-grid,
  .manifesto-grid,
  .process-steps {
    grid-template-columns: 1fr;
  }

  .diagram-grid {
    min-height: 280px;
  }
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .section {
    padding: 8vh 0;
  }

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

  .case-grid section {
    border-right: 0;
  }
}


.admin-panel {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1rem;
}

.admin-form {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1rem;
  display: grid;
  gap: 0.6rem;
  align-content: start;
}

.admin-form label {
  font-size: 0.8rem;
  color: var(--muted);
}

.admin-form input {
  border: 1px solid var(--line);
  padding: 0.6rem;
  font: inherit;
  background: #fff;
}

.admin-message {
  min-height: 1.3rem;
  margin: 0.2rem 0 0;
  font-size: 0.88rem;
}

.admin-list-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
}

.admin-list-head h2 {
  margin: 0;
  font-size: 1.1rem;
}

.photo-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.photo-item {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 0.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.photo-item a {
  color: var(--ink);
  font-size: 0.9rem;
  word-break: break-all;
}

.photo-item p {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.photo-actions {
  display: flex;
  gap: 0.5rem;
}

@media (max-width: 1080px) {
  .admin-panel {
    grid-template-columns: 1fr;
  }

  .photo-item {
    flex-direction: column;
    align-items: flex-start;
  }
}

.single-col {
  max-width: 720px;
}

.admin-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 1rem;
}

.admin-card {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1rem;
  display: grid;
  gap: 0.8rem;
  align-content: start;
}

.admin-card h2,
.admin-card h3,
.admin-card h4 {
  margin: 0;
}

.form-block {
  border: 1px solid var(--line);
  padding: 0.8rem;
  display: grid;
  gap: 0.45rem;
}

.form-block label,
.project-field-group label {
  font-size: 0.8rem;
  color: var(--muted);
}

.form-block input,
.form-block textarea,
.project-field-group input {
  border: 1px solid var(--line);
  padding: 0.55rem;
  font: inherit;
  background: #fff;
}

.project-field-group {
  border: 1px solid var(--line);
  padding: 0.7rem;
  margin-bottom: 0.7rem;
  display: grid;
  gap: 0.4rem;
}

.admin-actions {
  display: flex;
  gap: 0.6rem;
  justify-content: flex-end;
}

@media (max-width: 1080px) {
  .admin-grid-2 {
    grid-template-columns: 1fr;
  }
}

.nav-toggle {
  border: 1px solid var(--ink);
  background: #fff;
  color: var(--ink);
  width: 2rem;
  height: 2rem;
  line-height: 1;
  font-size: 1.1rem;
  cursor: pointer;
}

.auth-user {
  color: var(--muted);
}

.site-header.nav-collapsed nav {
  display: none;
}

.site-header:not(.nav-collapsed) nav {
  display: flex;
}

.login-wrap {
  display: grid;
  place-items: center;
  min-height: 70vh;
}

.login-form {
  width: min(420px, 92vw);
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1rem;
  display: grid;
  gap: 0.6rem;
}

.login-form h1 {
  margin: 0;
  font-size: 1.8rem;
}

.login-form label {
  font-size: 0.86rem;
  color: var(--muted);
}

.login-form input {
  border: 1px solid var(--line);
  padding: 0.55rem;
  font: inherit;
}

.admin-card-wide {
  grid-column: 1 / -1;
}

.user-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.user-item {
  border: 1px solid var(--line);
  padding: 0.8rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.8rem;
  background: #fff;
}

.user-item strong {
  font-size: 0.95rem;
}

.user-item p {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.user-actions {
  display: grid;
  grid-template-columns: 120px 190px auto auto;
  gap: 0.45rem;
  align-items: center;
}

.user-actions select,
.user-actions input {
  border: 1px solid var(--line);
  padding: 0.45rem;
  font: inherit;
}

@media (max-width: 980px) {
  .user-item {
    flex-direction: column;
  }

  .user-actions {
    grid-template-columns: 1fr;
    width: 100%;
  }
}

/* Nav layout refinement after auth links are injected */
.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  row-gap: 0.7rem;
}

.nav-toggle {
  order: 2;
  margin-left: auto;
  border-radius: 0;
  background: #fdfdfd;
}

.site-header nav {
  order: 3;
  width: 100%;
  padding-top: 0.65rem;
  border-top: 1px solid var(--line);
}

.site-header.nav-collapsed nav {
  display: none;
}

.site-header:not(.nav-collapsed) nav {
  display: flex;
  justify-content: flex-end;
  gap: 0.85rem;
  row-gap: 0.55rem;
}

nav a[data-auth-link="1"] {
  font-size: 0.84rem;
}

.auth-user {
  border: 1px solid var(--line);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  pointer-events: none;
}

@media (max-width: 980px) {
  .site-header:not(.nav-collapsed) nav {
    justify-content: flex-start;
  }
}