:root {
  --ink: #0c1a17;
  --ink-deep: #06110e;
  --jade: #3d8b7a;
  --jade-soft: #7eb8a8;
  --jade-glow: rgba(94, 168, 148, 0.35);
  --paper: #e8f0eb;
  --paper-muted: rgba(232, 240, 235, 0.62);
  --line: rgba(126, 184, 168, 0.35);
  --danger: #e8a090;
  --font-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --font-body: "Noto Serif SC", serif;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  color: var(--paper);
  background: var(--ink-deep);
  overflow-x: hidden;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 90% 70% at 12% 18%, rgba(61, 139, 122, 0.28), transparent 55%),
    radial-gradient(ellipse 70% 55% at 88% 82%, rgba(28, 72, 64, 0.55), transparent 50%),
    linear-gradient(160deg, #0a1c18 0%, #06110e 42%, #102820 100%);
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.18;
  background-image:
    repeating-linear-gradient(
      -18deg,
      transparent 0,
      transparent 11px,
      rgba(126, 184, 168, 0.07) 11px,
      rgba(126, 184, 168, 0.07) 12px
    );
  pointer-events: none;
}

.mist {
  position: absolute;
  border-radius: 50%;
  filter: blur(48px);
  pointer-events: none;
  animation: drift 18s ease-in-out infinite;
}

.mist-a {
  width: min(58vw, 420px);
  height: min(58vw, 420px);
  top: -8%;
  left: -6%;
  background: var(--jade-glow);
}

.mist-b {
  width: min(48vw, 360px);
  height: min(48vw, 360px);
  right: -4%;
  bottom: 8%;
  background: rgba(45, 110, 98, 0.4);
  animation-delay: -7s;
  animation-direction: reverse;
}

.grain {
  position: absolute;
  inset: 0;
  opacity: 0.07;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px;
  mix-blend-mode: soft-light;
}

.stage {
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: clamp(1.5rem, 5vw, 3rem);
}

.login-view,
.maintenance-view {
  width: min(100%, 26rem);
  text-align: center;
}

.login-view {
  animation: rise-in 0.85s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.brand-mark,
.maint-brand {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 9vw, 3.75rem);
  letter-spacing: 0.28em;
  line-height: 1;
  color: var(--paper);
  text-indent: 0.28em;
}

.brand-line {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3.6vw, 1.4rem);
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--jade-soft);
}

.brand-sub {
  margin: 0 0 2.4rem;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--paper-muted);
}

.login-form {
  display: grid;
  gap: 1.15rem;
  text-align: left;
}

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

.field label {
  font-size: 0.88rem;
  letter-spacing: 0.18em;
  color: var(--jade-soft);
}

.field input {
  width: 100%;
  padding: 0.95rem 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--paper);
  font: inherit;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  outline: none;
  transition:
    border-color 0.25s ease,
    box-shadow 0.25s ease;
}

.field input::placeholder {
  color: rgba(232, 240, 235, 0.32);
}

.field input:focus {
  border-bottom-color: var(--jade);
  box-shadow: 0 1px 0 0 var(--jade);
}

.form-error {
  margin: 0;
  min-height: 1.25rem;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: var(--danger);
}

.form-error[hidden] {
  display: none;
}

.submit {
  margin-top: 0.6rem;
  width: 100%;
  padding: 1rem 1.25rem;
  border: 1px solid rgba(126, 184, 168, 0.55);
  background:
    linear-gradient(180deg, rgba(61, 139, 122, 0.35), rgba(61, 139, 122, 0.12));
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.42em;
  text-indent: 0.42em;
  cursor: pointer;
  transition:
    background 0.25s ease,
    border-color 0.25s ease,
    transform 0.25s ease;
}

.submit:hover {
  background:
    linear-gradient(180deg, rgba(61, 139, 122, 0.5), rgba(61, 139, 122, 0.2));
  border-color: var(--jade-soft);
}

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

.maintenance-view {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 0.75rem;
  animation: rise-in 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.maintenance-view[hidden] {
  display: none;
}

.pulse-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(78vw, 22rem);
  height: min(78vw, 22rem);
  translate: -50% -50%;
  border: 1px solid rgba(126, 184, 168, 0.22);
  border-radius: 50%;
  pointer-events: none;
  animation: pulse 3.4s ease-out infinite;
}

.maint-title {
  margin: 0.35rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 5vw, 2rem);
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--paper);
}

.maint-copy {
  margin: 0;
  max-width: 18rem;
  font-size: 1rem;
  line-height: 1.7;
  letter-spacing: 0.08em;
  color: var(--paper-muted);
}

@keyframes drift {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(3%, 4%) scale(1.08);
  }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0% {
    opacity: 0.55;
    transform: scale(0.86);
  }
  70% {
    opacity: 0;
    transform: scale(1.08);
  }
  100% {
    opacity: 0;
    transform: scale(1.08);
  }
}

@media (max-width: 480px) {
  .brand-sub {
    margin-bottom: 2rem;
  }

  .submit {
    letter-spacing: 0.32em;
    text-indent: 0.32em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mist,
  .login-view,
  .maintenance-view,
  .pulse-ring {
    animation: none;
  }
}