:root {
  --blue: #2f78b8;
  --blue-deep: #24669d;
  --blue-soft: #4a8fc7;
  --link: #2e7dbd;
  --ink: #2a3a4a;
  --muted: #5d6d7c;
  --line: #c5ced6;
  --panel: rgba(255, 255, 255, 0.92);
  --banner: #3a3f44;
  --shadow: 0 18px 50px rgba(8, 18, 30, 0.28);
  --radius: 6px;
  --font: "Source Sans 3", "Segoe UI", sans-serif;
}

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

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

body {
  font-family: var(--font);
  color: var(--ink);
  background: #0d1b2a;
}

a {
  color: var(--link);
  text-decoration: none;
  font-weight: 600;
}

a:hover {
  text-decoration: underline;
}

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

.page {
  position: relative;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
}

.bg,
.bg-veil {
  position: fixed;
  inset: 0;
  z-index: 0;
}

.bg {
  background:
    linear-gradient(180deg, rgba(8, 20, 36, 0.28) 0%, rgba(8, 20, 36, 0.08) 40%, rgba(20, 18, 12, 0.35) 100%),
    url("assets/cranes.jpg") center / cover no-repeat;
  transform: scale(1.04);
  animation: bg-drift 18s ease-in-out infinite alternate;
}

.bg-veil {
  background:
    radial-gradient(ellipse 70% 50% at 50% 42%, rgba(255, 255, 255, 0.08), transparent 70%),
    linear-gradient(180deg, rgba(10, 22, 38, 0.35) 0%, transparent 35%, rgba(12, 16, 22, 0.25) 100%);
  pointer-events: none;
}

.top-banner,
.stage,
.site-footer {
  position: relative;
  z-index: 1;
}

.top-banner {
  background: var(--banner);
  color: #fff;
  text-align: center;
  padding: 0.55rem 1rem;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  animation: banner-in 0.55s ease both;
}

.top-banner p {
  margin: 0;
}

.top-banner a {
  color: #7ec8f0;
  font-weight: 600;
}

.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.25rem 2rem;
  gap: 1.15rem;
}

.brand {
  animation: rise-in 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.brand-logo {
  display: block;
  width: min(280px, 72vw);
  height: auto;
  filter: drop-shadow(0 6px 18px rgba(0, 0, 0, 0.35));
}

.panel {
  width: min(460px, 100%);
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem 2rem 1.5rem;
  animation: rise-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.08s both;
}

.panel h1 {
  margin: 0 0 1.1rem;
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--blue);
  letter-spacing: -0.01em;
}

.signin-form {
  display: grid;
  gap: 1rem;
}

.field-wrap {
  display: grid;
  gap: 0.4rem;
}

.field {
  position: relative;
  display: block;
}

.field-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: #8a97a3;
  display: grid;
  place-items: center;
  pointer-events: none;
}

.field input {
  width: 100%;
  height: 46px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  padding: 0 1rem 0 2.6rem;
  font: inherit;
  font-size: 1rem;
  color: var(--ink);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field input::placeholder {
  color: #9aa6b2;
}

.field input:focus {
  border-color: var(--blue-soft);
  box-shadow: 0 0 0 3px rgba(47, 120, 184, 0.16);
}

.field input.is-invalid {
  border-color: #c0392b;
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.12);
}

.field-error {
  margin: 0;
  font-size: 0.88rem;
  color: #c0392b;
}

.login-btn {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 118px;
  height: 42px;
  padding: 0 0.9rem 0 1.15rem;
  border: 0;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--blue-soft), var(--blue));
  color: #fff;
  font: inherit;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(36, 102, 157, 0.28);
  transition: transform 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.login-btn:hover:not(:disabled) {
  background: linear-gradient(180deg, var(--blue), var(--blue-deep));
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(36, 102, 157, 0.34);
}

.login-btn:active:not(:disabled) {
  transform: translateY(0);
}

.login-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.login-arrow {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  display: grid;
  place-items: center;
  transition: transform 0.2s ease;
}

.login-btn:hover .login-arrow {
  transform: translateX(2px);
}

.panel-divider {
  margin: 1.35rem 0 1.1rem;
  border-top: 1px dotted var(--line);
}

.panel-links {
  display: grid;
  gap: 0.45rem;
  text-align: center;
  font-size: 0.98rem;
  color: var(--muted);
}

.panel-links p {
  margin: 0;
}

.site-footer {
  text-align: center;
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.86rem;
  padding: 1rem 1rem 1.35rem;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.45);
  animation: banner-in 0.7s ease 0.15s both;
}

.site-footer p {
  margin: 0;
}

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

@keyframes banner-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes bg-drift {
  from {
    transform: scale(1.04) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.08) translate3d(0, -1.2%, 0);
  }
}

@media (max-width: 560px) {
  .stage {
    padding: 1.75rem 1rem 1.5rem;
  }

  .panel {
    padding: 1.4rem 1.15rem 1.25rem;
  }

  .panel h1 {
    font-size: 1.05rem;
  }

  .login-btn {
    width: 100%;
    justify-content: center;
  }

  .top-banner {
    font-size: 0.82rem;
    line-height: 1.35;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bg,
  .brand,
  .panel,
  .top-banner,
  .site-footer,
  .login-btn,
  .login-arrow {
    animation: none !important;
    transition: none !important;
  }

  .bg {
    transform: none;
  }
}