:root {
  color: #12342f;
  background: #eef5f2;
  font-family: Inter, Pretendard, "Noto Sans KR", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 15% 15%, rgba(20, 122, 105, .18), transparent 32rem),
    linear-gradient(145deg, #f8fbfa 0%, #e6f1ed 100%);
}

.signin-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.signin-card {
  width: min(100%, 28rem);
  padding: clamp(1.75rem, 6vw, 3rem);
  border: 1px solid rgba(18, 52, 47, .12);
  border-radius: 1.5rem;
  background: rgba(255, 255, 255, .94);
  box-shadow: 0 1.5rem 4rem rgba(18, 52, 47, .12);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  color: #12342f;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: .65rem;
  color: white;
  background: #08786c;
}

.eyebrow {
  margin: 2.5rem 0 .6rem;
  color: #08786c;
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .14em;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 8vw, 3rem);
  line-height: 1.05;
  letter-spacing: -.045em;
}

.lede { margin: .85rem 0 1.4rem; color: #516863; }

.trust-note {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-bottom: 1.4rem;
  padding: .85rem 1rem;
  border-radius: .85rem;
  color: #28514b;
  background: #edf7f4;
  font-size: .9rem;
}

.trust-dot {
  width: .6rem;
  height: .6rem;
  border-radius: 50%;
  background: #138c77;
  box-shadow: 0 0 0 .25rem rgba(19, 140, 119, .14);
}

.sso-button {
  width: 100%;
  min-height: 3.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .7rem;
  border: 0;
  border-radius: .9rem;
  color: white;
  background: #086c61;
  box-shadow: 0 .7rem 1.5rem rgba(8, 108, 97, .2);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.sso-button:hover { background: #075a52; }
.sso-button[aria-busy="true"] { opacity: .68; cursor: wait; }
.sso-button:focus-visible, .brand:focus-visible { outline: .2rem solid #075a52; outline-offset: .2rem; }

.status { min-height: 1.4rem; margin: 1rem 0 0; color: #516863; font-size: .88rem; text-align: center; }
.help { margin: .45rem 0 0; color: #596e69; font-size: .78rem; text-align: center; }
.error { color: #9f2f2f; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}