:root {
  color-scheme: light;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  color: #15253b;
  background: #f4f7fb;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background: linear-gradient(145deg, #f7f9fc 0%, #edf3f9 100%);
}

a {
  color: #175cd3;
  text-decoration: none;
}

.container {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  border-bottom: 1px solid #dce4ee;
  background: rgba(255, 255, 255, 0.96);
}

.nav-shell,
.nav-links {
  display: flex;
  align-items: center;
}

.nav-shell {
  min-height: 64px;
  justify-content: space-between;
}

.nav-links {
  gap: 18px;
}

.brand {
  color: #102a43;
  font-size: 1.08rem;
  font-weight: 750;
}

.nav-link,
.nav-user,
.nav-button {
  color: #3b4d63;
  font: inherit;
  font-size: 0.94rem;
}

.nav-button {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

main {
  min-height: calc(100vh - 128px);
  padding: 32px 0;
}

.hero {
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 5vw, 3.25rem);
}

.hero p,
.muted {
  color: #60758c;
}

.login-shell {
  display: grid;
  place-items: center;
  padding: 32px 0;
}

.login-card {
  width: min(420px, 100%);
  padding: 34px;
  border: 1px solid #dce4ee;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 18px 48px rgba(32, 57, 85, 0.1);
}

.login-card h1 {
  margin: 0 0 8px;
  font-size: 1.55rem;
}

.login-card .muted {
  margin: 0 0 28px;
}

.field {
  display: grid;
  gap: 7px;
  margin-bottom: 18px;
}

.field label {
  font-size: 0.92rem;
  font-weight: 650;
}

.field input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid #b8c6d8;
  border-radius: 9px;
  color: #15253b;
  background: #fff;
  font: inherit;
}

.field input:focus {
  border-color: #2870d7;
  outline: 3px solid rgba(40, 112, 215, 0.16);
}

.primary-button {
  width: 100%;
  min-height: 44px;
  margin-top: 6px;
  border: 0;
  border-radius: 9px;
  color: #fff;
  background: #175cd3;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.primary-button:hover {
  background: #124ba9;
}

.validation {
  color: #b42318;
  font-size: 0.86rem;
}

.validation:empty {
  display: none;
}

.alert {
  margin-top: 24px;
  padding: 16px;
  border-radius: 10px;
}

.alert.danger {
  color: #8c1d18;
  border: 1px solid #f2b8b5;
  background: #fff1f0;
}

.footer {
  min-height: 64px;
  padding: 22px 0;
  border-top: 1px solid #dce4ee;
  color: #718399;
  background: #fff;
  font-size: 0.86rem;
}

@media (max-width: 600px) {
  .nav-user,
  .nav-links > .nav-link:first-child {
    display: none;
  }

  .login-card {
    padding: 26px 22px;
  }
}