/* Student login — mobile-first */
.login-page {
  --ink: #1b2a41;
  --muted: #5c6b7a;
  --line: #d7e0ea;
  --accent: #1f6feb;
  --accent-soft: #e8f1ff;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(1200px 600px at 10% -10%, #cfe0ff 0%, transparent 55%),
    radial-gradient(900px 500px at 110% 10%, #d7f3ee 0%, transparent 50%),
    linear-gradient(180deg, #f3f6fb 0%, #e8eef6 100%);
  font-family: "THSarabunNew", "Sarabun", Helvetica, Arial, sans-serif;
  color: var(--ink);
}

.login-page .preloader {
  background: #f3f6fb;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 28px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 20px;
}

.login-brand {
  padding: 12px 8px 12px 4px;
}

.login-eyebrow {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.login-brand-title {
  margin: 0 0 12px;
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.login-brand-desc {
  margin: 0 0 18px;
  max-width: 34ch;
  font-size: 18px;
  line-height: 1.45;
  color: var(--muted);
}

.login-copy {
  margin: 0;
  font-size: 13px;
  color: #8a96a3;
}

.login-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px 26px 22px;
  box-shadow: 0 18px 40px rgba(27, 42, 65, 0.1);
}

.login-card-head {
  margin-bottom: 20px;
}

.login-card-head h2 {
  margin: 0 0 6px;
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
}

.login-card-head p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.4;
}

.login-field {
  margin-bottom: 14px;
}

.login-field label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.login-field .form-control {
  height: 48px;
  border-radius: 12px;
  border: 1px solid #c9d5e3;
  box-shadow: none;
  font-size: 16px;
  padding: 10px 14px;
  color: var(--ink);
}

.login-field .form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.16);
}

.login-hint {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.35;
}

.login-feedback {
  min-height: 8px;
  margin-bottom: 10px;
  font-size: 14px;
}

.login-btn-primary {
  width: 100%;
  height: 50px;
  border: 0;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  margin-top: 4px;
}

.login-btn-primary:hover,
.login-btn-primary:focus {
  background: #185dcc;
  color: #fff;
}

.login-closed {
  padding: 16px;
  border-radius: 12px;
  background: #fff5f5;
  border: 1px solid #f5a5a5;
  margin-bottom: 16px;
}

.login-closed strong {
  display: block;
  color: #c0392b;
  font-size: 18px;
  margin-bottom: 4px;
}

.login-closed p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.login-links {
  display: grid;
  gap: 10px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.login-link-btn {
  display: block;
  text-align: center;
  padding: 12px 14px;
  border-radius: 12px;
  background: #edf4ff;
  color: var(--accent);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none !important;
  border: 1px solid #c5d8f5;
}

.login-link-btn:hover {
  background: var(--accent-soft);
  color: #185dcc;
}

.login-link-btn.is-outline {
  background: #fff;
  color: var(--ink);
  border-color: var(--line);
}

.login-staff {
  margin: 16px 0 0;
  text-align: center;
  font-size: 14px;
}

.login-staff a {
  color: var(--muted);
  text-decoration: underline;
}

@media (max-width: 900px) {
  .login-shell {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px 16px 28px;
    align-content: start;
  }

  .login-brand {
    text-align: center;
    padding: 8px 4px 0;
  }

  .login-brand-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .login-brand-title {
    font-size: 34px;
  }

  .login-card {
    padding: 22px 18px 18px;
  }

  .login-admin-points {
    margin-left: auto;
    margin-right: auto;
    text-align: left;
  }
}

/* Admin login variant — slate / teal staff tone */
.login-page.is-admin {
  --ink: #152033;
  --muted: #5a6a7c;
  --line: #d2dde8;
  --accent: #0f766e;
  --accent-soft: #e6f5f3;
  background:
    radial-gradient(1100px 520px at 0% -5%, #c9e8e4 0%, transparent 52%),
    radial-gradient(900px 480px at 100% 0%, #d6e4f5 0%, transparent 48%),
    linear-gradient(180deg, #eef3f7 0%, #e4ecf3 100%);
}

.login-page.is-admin .login-eyebrow {
  color: #0f766e;
}

.login-page.is-admin .login-btn-primary {
  background: #0f766e;
}

.login-page.is-admin .login-btn-primary:hover,
.login-page.is-admin .login-btn-primary:focus {
  background: #0b5f59;
}

.login-page.is-admin .login-field .form-control:focus {
  border-color: #0f766e;
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.18);
}

.login-badge {
  display: inline-block;
  margin: 0 0 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #e6f5f3;
  border: 1px solid #b7e0db;
  color: #0f766e;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.login-admin-points {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  max-width: 38ch;
}

.login-admin-points li {
  position: relative;
  margin: 0 0 8px;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.4;
  color: var(--muted);
}

.login-admin-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #0f766e;
}

.login-page.is-admin .login-staff {
  color: var(--muted);
  text-decoration: none;
}