:root {
  --login-primary: #0018d8;
  --login-primary-2: #00129f;
  --login-accent: #18a45a;
  --login-bg: #eef3fb;
  --login-text: #273147;
}

body.login-page {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 20%, rgba(0, 70, 255, 0.15), transparent 38%),
    radial-gradient(circle at 85% 90%, rgba(24, 164, 90, 0.14), transparent 34%),
    var(--login-bg);
  color: var(--login-text);
  font-family: "Nunito", sans-serif;
}

.login-header {
  width: 100%;
  min-height: 132px;
  padding: 16px 30px;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 24px;
  background: linear-gradient(90deg, var(--login-primary) 0%, var(--login-primary-2) 100%);
  color: #f2f5ff;
  box-shadow: 0 4px 22px rgba(0, 20, 109, 0.35);
}

.login-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo-tecnm {
  width: 190px;
  max-width: 32vw;
  height: auto;
}

.header-logo-itst {
  width: 72px;
  max-width: 14vw;
  height: auto;
}

.login-header-inst p {
  margin: 0;
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: 0.2px;
}

.login-header-center {
  display: flex;
  justify-content: center;
}

.login-header-center h1 {
  margin: 0;
  color: #e7ecff;
  font-weight: 300;
  letter-spacing: 1.1px;
  font-size: clamp(2.4rem, 5.5vw, 5.2rem);
  line-height: 1;
  text-align: center;
}

.login-main {
  width: min(1120px, calc(100% - 32px));
  margin: 30px auto 38px;
}

.login-card {
  border-radius: 24px;
  overflow: hidden;
  background: #ffffff;
}

.login-grid {
  display: grid;
  grid-template-columns: minmax(320px, 1.12fr) minmax(320px, 1fr);
  min-height: 580px;
}

.login-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px;
  background:
    radial-gradient(circle at 22% 15%, rgba(255, 255, 255, 0.25), transparent 35%),
    radial-gradient(circle at 80% 90%, rgba(255, 255, 255, 0.16), transparent 36%),
    linear-gradient(150deg, #0027de 0%, #173ecf 55%, #0b2ea9 100%);
  color: #f4f7ff;
}

.login-visual-content {
  width: min(460px, 100%);
  text-align: center;
}

.login-visual-content h2 {
  margin: 0;
  font-size: clamp(1.5rem, 2.2vw, 2.1rem);
  font-weight: 800;
  letter-spacing: 0.3px;
}

.login-visual-content p {
  margin: 14px auto 20px;
  max-width: 420px;
  font-size: 1rem;
  opacity: 0.96;
}

.login-book-image {
  width: min(370px, 88%);
  max-height: 340px;
  object-fit: contain;
  filter: drop-shadow(0 16px 28px rgba(0, 0, 0, 0.32));
}

.login-form-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(24px, 3.4vw, 42px);
  background: #ffffff;
}

.login-form-head h2 {
  margin: 0;
  color: #17233a;
  font-size: clamp(1.7rem, 2.3vw, 2.15rem);
  font-weight: 800;
}

.login-form-head p {
  margin: 8px 0 22px;
  color: #5a6478;
  font-size: 0.96rem;
}

.login-label {
  color: #334158;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.login-form .form-control-user {
  border-radius: 13px;
  height: 48px;
  border: 1px solid #d5dcea;
  color: #1c2a45;
  padding: 0 15px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.login-form .form-control-user:focus {
  border-color: #3566ed;
  box-shadow: 0 0 0 0.2rem rgba(53, 102, 237, 0.17);
}

.login-check-label {
  color: #505f77;
}

.login-submit {
  height: 46px;
  border: 0;
  border-radius: 13px;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.2px;
  background: linear-gradient(90deg, #0036ef 0%, #2457f2 100%);
  box-shadow: 0 10px 20px rgba(36, 87, 242, 0.28);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.login-submit:hover,
.login-submit:focus {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(36, 87, 242, 0.36);
}

.login-form-panel hr {
  margin: 22px 0 16px;
}

.login-form-panel .small {
  font-size: 0.92rem;
  font-weight: 700;
}

@media (max-width: 1100px) {
  .login-grid {
    grid-template-columns: minmax(300px, 1fr) minmax(300px, 1fr);
  }

  .header-logo-tecnm {
    width: 170px;
  }
}

@media (max-width: 992px) {
  .login-header {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 14px 16px;
  }

  .login-header-left,
  .login-header-center {
    justify-content: center;
  }

  .login-header-left {
    flex-wrap: wrap;
  }

  .login-header-inst p {
    text-align: center;
  }

  .login-main {
    width: min(900px, calc(100% - 20px));
    margin-top: 18px;
  }

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

  .login-visual {
    min-height: 260px;
    padding: 22px;
  }

  .login-book-image {
    width: min(280px, 70%);
    max-height: 210px;
  }
}

@media (max-width: 576px) {
  .header-logo-tecnm {
    width: 145px;
  }

  .header-logo-itst {
    width: 62px;
  }

  .login-header-inst p {
    font-size: 0.84rem;
  }

  .login-header-center h1 {
    font-size: clamp(2rem, 9vw, 2.7rem);
  }

  .login-main {
    width: calc(100% - 14px);
    margin: 12px auto 16px;
  }

  .login-card {
    border-radius: 18px;
  }

  .login-form-panel {
    padding: 18px 16px 22px;
  }
}