:root {
    color-scheme: light dark;
    --color-canvas: #f6f7fb;
    --color-surface: #ffffff;
    --color-surface-raised: #ffffff;
    --color-surface-muted: #eceff7;
    --color-text: #171923;
    --color-text-muted: #606779;
    --color-border: #d8ddea;
    --color-border-strong: #b7bfd1;
    --color-control-border: #7d879d;
    --color-accent: #3857d6;
    --color-accent-strong: #2943b3;
    --color-accent-soft: #e8edff;
    --color-on-accent: #ffffff;
    --color-danger: #b4233c;
    --color-success: #247458;
    --color-success-soft: #e6f5ee;
    --color-focus: #506ad8;
    --shadow-soft: 0 24px 70px rgb(37 45 73 / 0.1);
    --shadow-control: 0 1px 2px rgb(27 31 45 / 0.08);
    --radius-sm: 0.75rem;
    --radius-md: 1.125rem;
    --radius-lg: 1.75rem;
    --content-width: 74rem;
    --header-height: 4.5rem;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  }

  @media (prefers-color-scheme: dark) {
    :root {
      --color-canvas: #101219;
      --color-surface: #181b24;
      --color-surface-raised: #20242f;
      --color-surface-muted: #272c38;
      --color-text: #f2f4fa;
      --color-text-muted: #abb3c5;
      --color-border: #343a49;
      --color-border-strong: #4b5366;
      --color-control-border: #737d93;
      --color-accent: #8499ef;
      --color-accent-strong: #a7b6f4;
      --color-accent-soft: #222d59;
      --color-on-accent: #101219;
      --color-danger: #ff9aad;
      --color-success: #75d4ae;
      --color-success-soft: #17372d;
      --color-focus: #a9b8ff;
      --shadow-soft: 0 28px 80px rgb(0 0 0 / 0.34);
      --shadow-control: 0 1px 2px rgb(0 0 0 / 0.24);
    }
  }

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

  html {
    min-width: 20rem;
    scroll-behavior: smooth;
  }

  body {
    min-height: 100dvh;
    margin: 0;
    background: var(--color-canvas);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
  }

  body::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
      radial-gradient(circle at 88% 7%, rgb(56 87 214 / 0.12), transparent 30rem),
      radial-gradient(circle at 8% 68%, rgb(104 126 214 / 0.08), transparent 28rem);
    content: "";
    pointer-events: none;
  }

  img,
  svg {
    display: block;
    max-width: 100%;
  }

  a {
    color: inherit;
    text-underline-offset: 0.2em;
  }

  a:hover { color: var(--color-accent-strong); }

  button,
  input,
  textarea {
    color: inherit;
    font: inherit;
  }

  button,
  .button {
    display: inline-flex;
    min-height: 2.75rem;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: fit-content;
    padding: 0.65rem 1rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    background: var(--color-accent);
    box-shadow: var(--shadow-control);
    color: var(--color-on-accent);
    cursor: pointer;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
    white-space: nowrap;
    transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
  }

  button:hover,
  .button:hover {
    background: var(--color-accent-strong);
    color: var(--color-on-accent);
  }

  button:active,
  .button:active { transform: translateY(1px); }

  button:disabled,
  .button[aria-disabled="true"] {
    cursor: wait;
    opacity: 0.66;
  }

  .button-secondary,
  .button-quiet {
    border-color: var(--color-control-border);
    background: var(--color-surface);
    color: var(--color-text);
  }

  .button-secondary:hover,
  .button-quiet:hover {
    border-color: var(--color-accent);
    background: var(--color-surface-muted);
    color: var(--color-text);
  }

  :where(a, button, input, textarea):focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 3px;
  }

  h1,
  h2,
  h3,
  p { margin-block-start: 0; }

  h1,
  h2,
  h3 {
    line-height: 1.08;
    letter-spacing: -0.035em;
  }

  h1 { font-size: clamp(2.25rem, 6vw, 4.8rem); }
  h2 { font-size: clamp(1.55rem, 3vw, 2.55rem); }
  h3 { font-size: 1.1rem; }

  code {
    padding: 0.18rem 0.38rem;
    border-radius: 0.4rem;
    background: var(--color-surface-muted);
    font-size: 0.9em;
  }

  .skip-link {
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 10;
    padding: 0.6rem 0.85rem;
    border-radius: var(--radius-sm);
    background: var(--color-text);
    color: var(--color-canvas);
    transform: translateY(-160%);
  }

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

  .shell {
    width: min(calc(100% - 2rem), var(--content-width));
    margin-inline: auto;
  }

  .site-header {
    min-height: var(--header-height);
    border-bottom: 1px solid rgb(183 191 209 / 0.55);
    background: rgb(246 247 251 / 0.86);
    backdrop-filter: blur(18px);
  }

  .site-nav {
    display: flex;
    min-height: var(--header-height);
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
  }

  .brand {
    color: var(--color-text);
    font-size: 1.35rem;
    font-weight: 850;
    letter-spacing: -0.06em;
    text-decoration: none;
  }

  .brand:hover { color: var(--color-accent); }

  .nav-actions,
  .logout-control,
  .logout-form {
    display: flex;
    align-items: center;
    gap: 0.65rem;
  }

  .nav-status {
    max-width: 15rem;
    color: var(--color-text-muted);
    font-size: 0.83rem;
  }

  .nav-status[data-error="true"] { color: var(--color-danger); }

  .page-main { min-height: calc(100dvh - var(--header-height)); }

  .surface-app .page-main,
  .surface-auth .page-main {
    width: min(calc(100% - 2rem), var(--content-width));
    margin-inline: auto;
    padding-block: clamp(2rem, 5vw, 4.5rem);
  }

  .landing-hero {
    display: grid;
    min-height: calc(100dvh - var(--header-height));
    grid-template-columns: minmax(0, 1.05fr) minmax(18rem, 0.95fr);
    align-items: center;
    gap: clamp(2rem, 7vw, 7rem);
    padding-block: clamp(3rem, 8vw, 6rem);
  }

  .hero-copy { max-width: 42rem; }

  .hero-copy h1 {
    max-width: 12ch;
    margin-bottom: 1.35rem;
  }

  .hero-copy > p {
    max-width: 37rem;
    margin-bottom: 2rem;
    color: var(--color-text-muted);
    font-size: clamp(1.03rem, 2vw, 1.2rem);
  }

  .hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.8rem;
  }

  .hero-note {
    color: var(--color-text-muted);
    font-size: 0.9rem;
  }

  .hero-visual {
    margin: 0;
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface-raised);
    box-shadow: var(--shadow-soft);
  }

  .hero-visual img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
  }

  .hero-visual figcaption {
    padding: 0.8rem 1rem;
    color: var(--color-text-muted);
    font-size: 0.84rem;
  }

  .landing-section { padding-block: clamp(4.5rem, 10vw, 8rem); }

  .landing-section-heading {
    max-width: 42rem;
    margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
  }

  .landing-section-heading p {
    max-width: 38rem;
    color: var(--color-text-muted);
  }

  .workflow-list {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(16rem, 0.85fr);
    gap: 0;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--color-border-strong);
    list-style: none;
  }

  .workflow-list li {
    display: grid;
    min-height: 10rem;
    align-content: center;
    padding: 1.75rem;
    border-bottom: 1px solid var(--color-border);
  }

  .workflow-list li:nth-child(odd) { border-right: 1px solid var(--color-border); }
  .workflow-list h3 { margin-bottom: 0.55rem; }

  .workflow-list p {
    max-width: 30rem;
    margin-bottom: 0;
    color: var(--color-text-muted);
  }

  .landing-cta {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 2rem;
    padding: clamp(2rem, 6vw, 4.5rem);
    border-radius: var(--radius-lg);
    background: var(--color-text);
    color: var(--color-canvas);
  }

  .landing-cta h2 {
    max-width: 16ch;
    margin-bottom: 0;
  }

  .landing-cta .button {
    background: var(--color-canvas);
    color: var(--color-text);
  }

  .landing-cta .button:focus-visible { outline-color: var(--color-canvas); }

  .landing-footer {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding-block: 2rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
  }

  .auth-shell {
    display: grid;
    min-height: calc(100dvh - var(--header-height) - 8rem);
    grid-template-columns: minmax(0, 0.9fr) minmax(22rem, 0.7fr);
    align-items: center;
    gap: clamp(2rem, 8vw, 7rem);
  }

  .auth-intro { max-width: 37rem; }

  .auth-intro h1 {
    max-width: 10ch;
    margin-bottom: 1.25rem;
  }

  .auth-intro p {
    max-width: 34rem;
    color: var(--color-text-muted);
    font-size: 1.05rem;
  }

  .auth-card,
  form:not(.logout-form) {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-soft);
  }

  .auth-card { padding: clamp(1.5rem, 4vw, 2.5rem); }

  .auth-card h2 {
    margin-bottom: 1.75rem;
    font-size: 1.7rem;
  }

  form:not(.logout-form) {
    display: grid;
    gap: 1.15rem;
    padding: clamp(1.25rem, 4vw, 2rem);
  }

  .auth-card form {
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .field {
    display: grid;
    gap: 0.45rem;
  }

  label { font-weight: 720; }

  input,
  textarea {
    width: 100%;
    border: 1px solid var(--color-control-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface-raised);
    box-shadow: var(--shadow-control);
  }

  input {
    min-height: 3rem;
    padding: 0.7rem 0.85rem;
  }

  textarea {
    min-height: 16rem;
    padding: 0.9rem;
    line-height: 1.65;
    resize: vertical;
  }

  .form-help,
  #brief-help {
    margin-block: -0.15rem 0;
    color: var(--color-text-muted);
    font-size: 0.9rem;
  }

  .error {
    min-height: 1.45em;
    margin-bottom: 0;
    color: var(--color-danger);
    font-size: 0.92rem;
  }

  .dashboard-heading,
  .page-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 2rem;
    margin-bottom: clamp(2rem, 5vw, 3.5rem);
  }

  .dashboard-heading h1,
  .page-heading h1 {
    margin-bottom: 0.5rem;
    font-size: clamp(2.25rem, 5vw, 3.6rem);
  }

  .dashboard-heading p,
  .page-heading p {
    margin-bottom: 0;
    color: var(--color-text-muted);
  }

  .site-list {
    display: grid;
    gap: 0.9rem;
  }

  .site-record {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 1.5rem;
    padding: 1.3rem 1.45rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    transition: transform 160ms ease, border-color 160ms ease;
  }

  .site-record:hover {
    border-color: var(--color-border-strong);
    transform: translateY(-1px);
  }

  .site-record-main {
    display: grid;
    min-width: 0;
    grid-template-columns: minmax(10rem, 0.8fr) minmax(12rem, 1fr) auto;
    align-items: center;
    gap: 1.5rem;
  }

  .site-record h2 {
    margin-bottom: 0;
    font-size: 1.12rem;
    letter-spacing: -0.02em;
    overflow-wrap: anywhere;
  }

  .site-domain {
    overflow: hidden;
    margin-bottom: 0;
    color: var(--color-text-muted);
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .site-state {
    width: fit-content;
    margin-bottom: 0;
    padding: 0.25rem 0.55rem;
    border-radius: 0.55rem;
    background: var(--color-surface-muted);
    color: var(--color-text-muted);
    font-size: 0.82rem;
    font-weight: 750;
  }

  .site-state[data-state="published"] {
    background: var(--color-success-soft);
    color: var(--color-success);
  }

  .site-record-actions {
    display: flex;
    align-items: center;
    gap: 0.65rem;
  }

  .empty-state {
    display: grid;
    min-height: 22rem;
    place-items: center;
    padding: 2rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    text-align: center;
  }

  .empty-state > div { max-width: 29rem; }
  .empty-state h2 { margin-bottom: 0.8rem; }

  .empty-state p {
    margin-bottom: 1.5rem;
    color: var(--color-text-muted);
  }

  .surface-app .page-main > form,
  .surface-app .page-main > section { margin-bottom: 1.25rem; }

  .surface-app .page-main > section:not(.dashboard) {
    padding: clamp(1.25rem, 4vw, 2rem);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
  }

  .surface-app .page-main > section h2 { font-size: 1.45rem; }
  .surface-app ul { padding-left: 1.2rem; }

  [hidden] { display: none !important; }

  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  @media (prefers-color-scheme: dark) {
    body::before {
      background:
        radial-gradient(circle at 88% 7%, rgb(93 119 224 / 0.13), transparent 30rem),
        radial-gradient(circle at 8% 68%, rgb(65 78 132 / 0.12), transparent 28rem);
    }

    .site-header {
      border-bottom-color: rgb(75 83 102 / 0.62);
      background: rgb(16 18 25 / 0.86);
    }
  }

  @media (max-width: 48rem) {
    .nav-actions { gap: 0.45rem; }

    .nav-actions .button {
      min-height: 2.45rem;
      padding: 0.55rem 0.72rem;
      font-size: 0.9rem;
    }

    .nav-status {
      position: absolute;
      top: calc(var(--header-height) - 0.15rem);
      right: 1rem;
      max-width: calc(100vw - 2rem);
      padding: 0.35rem 0.55rem;
      border-radius: 0.5rem;
      background: var(--color-surface);
    }

    .landing-hero,
    .auth-shell,
    .workflow-list,
    .landing-cta {
      grid-template-columns: 1fr;
    }

    .landing-hero {
      min-height: auto;
      padding-block: 3.25rem 4rem;
    }

    .hero-copy h1 {
      max-width: 14ch;
      font-size: clamp(2.45rem, 12vw, 3.9rem);
    }

    .workflow-list li:nth-child(odd) { border-right: 0; }
    .landing-cta { align-items: start; }

    .landing-footer,
    .dashboard-heading,
    .page-heading {
      align-items: flex-start;
      flex-direction: column;
    }

    .auth-shell { min-height: auto; }

    .auth-intro h1 {
      max-width: 14ch;
      font-size: 2.6rem;
    }

    .site-record,
    .site-record-main {
      grid-template-columns: minmax(0, 1fr);
      align-items: start;
      gap: 0.85rem;
    }

    .site-record-actions {
      width: 100%;
      flex-wrap: wrap;
    }

    .site-record-actions .button { flex: 1; }
  }

  @media (max-width: 31rem) {
    .nav-actions > a:not(.button) { display: none; }

    .surface-app .page-main,
    .surface-auth .page-main,
    .shell { width: min(calc(100% - 1.25rem), var(--content-width)); }

    .logout-form .button { padding-inline: 0.65rem; }
  }

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

    *,
    *::before,
    *::after {
      scroll-behavior: auto !important;
      transition-duration: 0.01ms !important;
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
    }
  }