:root {
  color-scheme: light;
  --brand-navy: #000C3D;
  --brand-navy-deep: #000637;
  --brand-blue: #2389FE;
  --brand-blue-strong: #006BE6;
  --brand-blue-accessible: #005FCC;
  --brand-blue-light: #66BFFE;
  --brand-ice: #B2DEFD;
  --brand-white: #FFFFFF;
  --surface-base: #FFFFFF;
  --surface-elevated: #FFFFFF;
  --surface-light: #F5F8FC;
  --surface-blue: #EAF5FF;
  --text-primary: #071331;
  --text-secondary: #4D5D73;
  --text-tertiary: #5F6D82;
  --border-light: #DCE5EF;
  --border-dark: #29406F;
  --status-current: #0B6E4F;
  --status-review: #8A5A00;
  --status-review-bg: #FFF3D6;
  --calendar-sunday: #D92D20;
  --focus-ring: #2389FE;
  --font-sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", Pretendard,
    "Noto Sans KR", sans-serif;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --content-width: 1240px;
  --reading-width: 720px;
  --font-small: 0.875rem;
  --motion-lift-small: -2px;
  --nav-height: 72px;
  --header-height: var(--nav-height);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-nav: 0 8px 32px rgba(0, 12, 61, 0.06);
  --header-background: rgba(255, 255, 255, 0.9);
  --header-border: rgba(7, 19, 49, 0.08);
  --install-title-size: 2.5rem;
  --install-title-size-wide: 4rem;
  --install-heading-size: 2rem;
  --install-heading-size-wide: 3rem;
  --install-lead-size: 1.25rem;
  --install-code-size: 0.875rem;
  --install-copy-width: 700px;
  --install-segment-width: 420px;
  --install-hero-overlay: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.12) 0%,
    rgba(255, 255, 255, 0.9) 54%,
    rgba(255, 255, 255, 0.98) 100%
  );
  --install-hero-overlay-mobile: rgba(255, 255, 255, 0.9);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-4));
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  background: var(--surface-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

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

button {
  font: inherit;
}

h1,
h2,
h3,
p,
ol,
ul {
  margin-top: 0;
}

p {
  text-wrap: pretty;
}

:focus-visible {
  outline: 4px solid var(--focus-ring);
  outline-offset: var(--space-1);
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 200;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--brand-navy);
  color: var(--brand-white);
  transform: translateY(-200%);
  transition: transform 180ms var(--ease-out);
}

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

.section-shell,
.nav-shell {
  width: min(100% - (var(--space-5) * 2), var(--content-width));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  min-height: var(--header-height);
  border-bottom: 1px solid var(--header-border);
  background: var(--header-background);
  box-shadow: var(--shadow-nav);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  backdrop-filter: blur(20px) saturate(140%);
}

.nav-shell {
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.brand {
  order: 1;
  min-width: 0;
  min-height: 48px;
  display: inline-flex;
  align-items: center;
}

.brand img {
  width: 136px;
  max-width: 40vw;
}

.install-page {
  letter-spacing: 0;
}

.install-nav-shell {
  justify-content: space-between;
}

.install-nav {
  order: 2;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.install-nav a {
  min-height: 44px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  color: var(--text-secondary);
  font-size: var(--font-small);
  font-weight: 650;
  transition: color 180ms var(--ease-out), background-color 180ms var(--ease-out),
    transform 180ms var(--ease-out);
}

.install-nav a:hover {
  background: var(--surface-blue);
  color: var(--brand-blue-strong);
  transform: translateY(var(--motion-lift-small));
}

.install-nav a:active {
  transform: scale(0.98);
}

.install-hero {
  position: relative;
  min-height: calc(100svh - var(--header-height) - var(--space-16));
  overflow: hidden;
  background: var(--surface-base);
  display: grid;
  align-items: center;
}

.install-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--install-hero-overlay-mobile);
}

.install-hero-media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.install-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 42% center;
}

.install-hero-inner {
  position: relative;
  z-index: 1;
  padding-top: calc(var(--header-height) + var(--space-16));
  padding-bottom: var(--space-20);
}

.install-hero-copy {
  max-width: var(--install-copy-width);
  margin-left: auto;
}

.install-kicker {
  margin-bottom: var(--space-4);
  color: var(--brand-blue-accessible);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.install-hero h1 {
  margin-bottom: var(--space-6);
  color: var(--brand-navy);
  font-size: var(--install-title-size);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0;
  word-break: keep-all;
}

.install-lead {
  max-width: var(--reading-width);
  margin-bottom: var(--space-8);
  color: var(--text-secondary);
  font-size: var(--install-lead-size);
  font-weight: 450;
  line-height: 1.65;
  letter-spacing: 0;
}

.install-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.install-button {
  min-height: 48px;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font: inherit;
  font-weight: 700;
  line-height: 1.3;
  text-align: center;
  cursor: pointer;
  transition: background-color 180ms var(--ease-out), border-color 180ms var(--ease-out),
    color 180ms var(--ease-out), transform 180ms var(--ease-out);
}

.install-button:hover {
  transform: translateY(var(--motion-lift-small));
}

.install-button:active {
  transform: scale(0.98);
}

.install-button:disabled {
  cursor: not-allowed;
  opacity: 0.64;
  transform: none;
}

.install-button-primary {
  border: 1px solid var(--brand-blue-strong);
  background: var(--brand-blue-strong);
  color: var(--brand-white);
}

.install-button-primary:hover {
  border-color: var(--brand-navy);
  background: var(--brand-navy);
}

.install-button-secondary {
  border: 1px solid var(--border-light);
  background: var(--surface-elevated);
  color: var(--text-primary);
}

.install-button-secondary:hover {
  border-color: var(--brand-ice);
  background: var(--surface-blue);
}

.install-copy-status {
  min-height: var(--space-6);
  margin: var(--space-4) 0 0;
  color: var(--text-secondary);
  font-size: var(--font-small);
}

.install-copy-status.is-success {
  color: var(--status-current);
  font-weight: 650;
}

.install-copy-status.is-error {
  color: var(--calendar-sunday);
  font-weight: 650;
}

.install-hero-note {
  max-width: var(--reading-width);
  margin: var(--space-6) 0 0;
  padding-left: var(--space-4);
  border-left: 4px solid var(--brand-blue);
  color: var(--text-primary);
  font-size: var(--font-small);
  font-weight: 600;
}

.install-outcomes {
  border-block: 1px solid var(--border-light);
  background: var(--surface-blue);
}

.install-outcomes-inner {
  display: grid;
  gap: var(--space-6);
  padding-block: var(--space-8);
}

.install-outcomes h2 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0;
}

.install-outcomes ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-4);
}

.install-outcomes li {
  display: grid;
  gap: var(--space-1);
}

.install-outcomes strong {
  color: var(--text-primary);
}

.install-outcomes span {
  color: var(--text-secondary);
  font-size: var(--font-small);
}

.install-section {
  padding-block: var(--space-20);
  background: var(--surface-base);
}

.install-section-heading {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

.install-section-heading .install-kicker {
  margin-bottom: 0;
}

.install-section-heading h2,
.install-vault-copy h2,
.install-approval-layout h2,
.install-trouble-layout h2,
.install-start h2,
.install-privacy h2 {
  margin: 0;
  color: var(--text-primary);
  font-size: var(--install-heading-size);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0;
  word-break: keep-all;
}

.install-section-heading > p:last-child,
.install-vault-copy > p,
.install-approval-layout > div > p,
.install-trouble-layout > header > p,
.install-start-inner > div > p,
.install-privacy p {
  max-width: var(--reading-width);
  margin: 0;
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.install-step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--border-light);
}

.install-step-list li {
  display: grid;
  grid-template-columns: var(--space-12) minmax(0, 1fr);
  gap: var(--space-4);
  padding-block: var(--space-6);
  border-bottom: 1px solid var(--border-light);
}

.install-step-list > li > span {
  color: var(--brand-blue-accessible);
  font-size: 1rem;
  font-weight: 700;
}

.install-step-list strong {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
  font-size: 1.25rem;
}

.install-step-list p {
  margin: 0;
  color: var(--text-secondary);
}

.install-step-list small {
  grid-column: 2;
  width: fit-content;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--status-review-bg);
  color: var(--status-review);
  font-size: 0.75rem;
  font-weight: 700;
}

.install-vault-section {
  border-block: 1px solid var(--border-light);
  background: var(--surface-light);
}

.install-vault-layout {
  display: grid;
  gap: var(--space-12);
}

.install-vault-copy {
  display: grid;
  gap: var(--space-6);
}

.install-tree,
.install-request-details pre {
  max-width: 100%;
  margin: 0;
  overflow: auto;
  color: var(--text-primary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: var(--install-code-size);
  line-height: 1.7;
  white-space: pre;
}

.install-tree {
  padding: var(--space-6);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--surface-elevated);
}

.install-vault-visual {
  margin: 0;
}

.install-vault-visual img {
  width: 100%;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

.install-vault-visual figcaption {
  margin-top: var(--space-3);
  color: var(--text-tertiary);
  font-size: var(--font-small);
}

.install-platform-heading {
  margin-bottom: var(--space-8);
}

.install-platform-tabs {
  width: min(100%, var(--install-segment-width));
  margin-bottom: var(--space-8);
  padding: var(--space-1);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  background: var(--surface-light);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-1);
}

.install-platform-tabs button {
  min-height: 44px;
  padding-inline: var(--space-4);
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-secondary);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: color 180ms var(--ease-out), background-color 180ms var(--ease-out),
    transform 180ms var(--ease-out);
}

.install-platform-tabs button:hover {
  color: var(--brand-blue-strong);
}

.install-platform-tabs button[aria-selected="true"] {
  background: var(--brand-navy);
  color: var(--brand-white);
}

.install-platform-tabs button:active {
  transform: scale(0.98);
}

.install-platform-panels {
  border-top: 1px solid var(--border-light);
}

.install-platform-panel {
  display: grid;
  gap: var(--space-6);
  padding-block: var(--space-8);
  border-bottom: 1px solid var(--border-light);
}

.install-platform-panel h3 {
  margin-bottom: var(--space-3);
  font-size: 1.5rem;
  letter-spacing: 0;
}

.install-platform-panel p,
.install-platform-panel li {
  color: var(--text-secondary);
}

.install-platform-panel p {
  margin: 0;
}

.install-platform-panel ul {
  margin: 0;
  padding-left: var(--space-5);
}

.install-platform-panel li + li {
  margin-top: var(--space-2);
}

.install-platform-panel a {
  width: fit-content;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--brand-blue-accessible);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: var(--space-1);
}

.install-approval-section {
  padding-block: var(--space-20);
  border-block: 1px solid var(--border-light);
  background: var(--surface-base);
}

.install-approval-layout {
  display: grid;
  gap: var(--space-10);
}

.install-approval-layout > div {
  display: grid;
  gap: var(--space-5);
}

.install-approval-layout ul {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--border-light);
}

.install-approval-layout li {
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
  font-weight: 650;
}

.install-privacy {
  padding-block: var(--space-12);
  background: var(--status-review-bg);
}

.install-privacy-inner {
  display: grid;
  gap: var(--space-5);
}

.install-privacy h2 {
  color: var(--status-review);
}

.install-privacy p {
  color: var(--text-primary);
}

.install-privacy code {
  overflow-wrap: anywhere;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: var(--install-code-size);
  font-weight: 700;
}

.install-trouble-layout {
  display: grid;
  gap: var(--space-12);
}

.install-trouble-layout > header {
  display: grid;
  gap: var(--space-5);
}

.install-details-list {
  border-top: 1px solid var(--border-light);
}

.install-details-list details {
  border-bottom: 1px solid var(--border-light);
}

.install-details-list summary {
  min-height: 64px;
  padding-block: var(--space-4);
  display: flex;
  align-items: center;
  color: var(--text-primary);
  font-weight: 700;
  cursor: pointer;
}

.install-details-list details[open] summary {
  color: var(--brand-blue-accessible);
}

.install-details-list p {
  max-width: var(--reading-width);
  margin: 0 0 var(--space-5);
  color: var(--text-secondary);
}

.install-start {
  padding-block: var(--space-20);
  border-top: 1px solid var(--brand-ice);
  background: var(--surface-blue);
}

.install-start-inner {
  display: grid;
  gap: var(--space-5);
}

.install-start-inner .install-button {
  width: fit-content;
}

.install-request-details {
  max-width: var(--reading-width);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--brand-ice);
}

.install-request-details summary {
  min-height: 44px;
  color: var(--brand-blue-accessible);
  font-weight: 700;
  cursor: pointer;
}

.install-request-details pre {
  margin-top: var(--space-4);
  padding: var(--space-5);
  border: 1px solid var(--brand-ice);
  border-radius: var(--radius-md);
  background: var(--surface-elevated);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.install-source-note {
  margin: var(--space-4) 0 0;
  color: var(--text-secondary);
  font-size: var(--font-small);
}

.install-source-note a {
  color: var(--brand-blue-accessible);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: var(--space-1);
}

.install-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  margin: 0;
  padding-top: var(--space-5);
  border-top: 1px solid var(--border-dark);
}

.install-footer-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: var(--brand-blue-light);
  font-size: var(--font-small);
  font-weight: 650;
}

.site-footer {
  padding-block: var(--space-16);
  background: var(--brand-navy-deep);
  color: var(--brand-white);
}

.footer-inner {
  display: grid;
  gap: var(--space-10);
}

.footer-brand p {
  margin-bottom: var(--space-2);
  color: var(--brand-blue-light);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.footer-brand strong {
  font-size: 2rem;
  line-height: 1.2;
}

.footer-notes {
  margin: 0;
  padding-left: var(--space-5);
  color: rgba(255, 255, 255, 0.64);
  font-size: var(--font-small);
}

.footer-notes li + li {
  margin-top: var(--space-2);
}

@media (max-width: 720px) {
  .install-nav a:not(:last-child) {
    display: none;
  }

  .install-nav a {
    padding-inline: var(--space-3);
  }

  .install-hero-actions,
  .install-hero-actions .install-button,
  .install-start-inner .install-button {
    width: 100%;
  }
}

@media (min-width: 768px) {
  .section-shell,
  .nav-shell {
    width: min(100% - (var(--space-8) * 2), var(--content-width));
  }

  .install-hero::after {
    background: var(--install-hero-overlay);
  }

  .install-hero-media img {
    object-position: center;
  }

  .install-hero h1 {
    font-size: var(--install-title-size-wide);
  }

  .install-section-heading h2,
  .install-vault-copy h2,
  .install-approval-layout h2,
  .install-trouble-layout h2,
  .install-start h2,
  .install-privacy h2 {
    font-size: var(--install-heading-size-wide);
  }

  .install-outcomes-inner {
    grid-template-columns: minmax(160px, 0.35fr) minmax(0, 1.65fr);
    align-items: center;
  }

  .install-outcomes ul {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .install-step-list li {
    grid-template-columns: var(--space-12) minmax(0, 1fr) minmax(150px, auto);
    align-items: start;
    gap: var(--space-6);
  }

  .install-step-list small {
    grid-column: 3;
    justify-self: end;
  }

  .install-vault-layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .install-platform-panel {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
  }

  .install-platform-panel > a {
    grid-column: 2;
  }

  .install-approval-layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .install-trouble-layout {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
  }

  .install-trouble-layout > header {
    position: sticky;
    top: calc(var(--header-height) + var(--space-8));
  }
}

@media (min-width: 1100px) {
  .install-hero-copy {
    width: 54%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .install-button,
  .install-nav a,
  .install-platform-tabs button {
    transition: none;
  }
}