* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  min-height: 100vh;
}

/* ── Login Page ── */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.login-card {
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.logo {
  display: inline-block;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  color: #fff;
  font-weight: 800;
  font-size: 28px;
  padding: 8px 24px;
  border-radius: 10px;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.login-header h1 {
  font-size: 20px;
  font-weight: 600;
  color: #f1f5f9;
  margin-bottom: 6px;
}

.login-header p {
  font-size: 14px;
  color: #94a3b8;
}

/* ── Form ── */
.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: #94a3b8;
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  font-size: 15px;
  color: #f1f5f9;
  background: #0f172a;
  border: 1px solid #334155;
  border-radius: 10px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input::placeholder {
  color: #475569;
}

.form-group input:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* ── Button ── */
.btn-primary {
  width: 100%;
  padding: 13px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  margin-top: 6px;
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-loading {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.spinner {
  width: 18px;
  height: 18px;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Error ── */
.error-msg {
  margin-top: 14px;
  padding: 12px 14px;
  font-size: 13px;
  color: #fca5a5;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: 10px;
  text-align: center;
}

[hidden] { display: none !important; }

/* ── Iframe Page ── */
.iframe-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.iframe-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: #1e293b;
  border-bottom: 1px solid #334155;
  flex-shrink: 0;
  height: 52px;
}

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

.logo-sm {
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  color: #fff;
  font-weight: 800;
  font-size: 14px;
  padding: 4px 12px;
  border-radius: 6px;
  letter-spacing: 1px;
}

.employee-info {
  font-size: 13px;
  color: #94a3b8;
}

.btn-logout {
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  color: #fca5a5;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-logout:hover {
  background: rgba(239, 68, 68, 0.2);
}

#main-iframe {
  flex: 1;
  width: 100%;
  border: none;
}