:root {
  color-scheme: light;
  --ink: #111111;
  --muted: #5f6368;
  --line: #e6e6e6;
  --soft: #f6f6f4;
  --panel: #ffffff;
  --dark: #101113;
  --dark-2: #1d1f22;
  --accent: #d8ff62;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #f4f4f1;
  color: var(--ink);
  font-family: Inter, Pretendard, "Noto Sans KR", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
  word-break: keep-all;
}

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

.shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
}

.mark {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0;
}

.caption,
.session-note,
.module-meta,
.eyebrow {
  color: var(--muted);
  font-size: 13px;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topnav a,
.primary,
.module-link,
.login-panel button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 1px solid var(--dark);
  background: var(--dark);
  color: #fff;
  padding: 0 16px;
  font-weight: 800;
}

.topnav a:first-child {
  background: transparent;
  color: var(--ink);
}

.primary {
  background: var(--accent);
  color: var(--dark);
  border-color: var(--accent);
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.module-card {
  min-height: 260px;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.module-card.active {
  border-color: var(--dark);
}

.module-card.muted {
  opacity: .72;
}

.module-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.module-name {
  font-size: 20px;
  font-weight: 900;
}

.status {
  border: 1px solid var(--line);
  padding: 5px 8px;
  font-size: 12px;
  font-weight: 800;
}

.module-card h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.35;
}

.module-link {
  margin-top: auto;
  width: fit-content;
}

.module-link.disabled {
  background: var(--soft);
  color: var(--muted);
  border-color: var(--line);
}

.ops-note {
  margin-top: 18px;
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 20px;
  border: 1px solid var(--line);
  background: #fff;
  padding: 28px;
}

.ops-note h2 {
  margin: 4px 0 0;
  font-size: 26px;
}

.ops-note h2 span {
  background: var(--dark);
  color: #fff;
  padding: 0 8px;
}

.ops-note p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.login-body {
  display: grid;
  place-items: center;
  background: var(--dark);
}

.login-shell {
  width: min(440px, calc(100% - 36px));
}

.login-panel {
  background: #fff;
  padding: 34px;
  border: 1px solid rgba(255, 255, 255, .12);
}

.login-panel h1 {
  margin: 8px 0;
  font-size: 36px;
}

.login-panel p {
  margin: 0 0 24px;
  color: var(--muted);
  line-height: 1.65;
}

.login-panel form {
  display: grid;
  gap: 12px;
}

.login-panel label {
  font-size: 13px;
  font-weight: 800;
}

.login-panel input {
  width: 100%;
  height: 48px;
  border: 1px solid var(--line);
  padding: 0 14px;
  font: inherit;
}

.login-panel button {
  width: 100%;
  cursor: pointer;
}

.error {
  margin-bottom: 16px;
  border: 1px solid #d79b93;
  background: #fff4f2;
  color: #8a2c23;
  padding: 12px;
  font-size: 14px;
}

@media (max-width: 920px) {
  .module-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ops-note {
    padding: 30px;
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 24px, 1180px);
    padding-top: 12px;
  }

  .topbar,
  .ops-note {
    grid-template-columns: 1fr;
    display: grid;
  }

  .topnav {
    justify-content: stretch;
  }

  .topnav a {
    flex: 1;
  }

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